Systems and methods for reducing interference between a plurality of wireless communications modules

Mobile communication system and method for reducing signal interference

SYSTEMS AND METHODS FOR REDUCING INTERFERENCE BETWEEN A PLURALITY OF WIRELESS COMMUNICATIONS MODULES

The present invention relates to a communication system for coexistence of multiple wireless communication modules, and more particularly relates to a communication system and method for reducing signal interference between coexisting wireless communication modules .

With the trend, more and more communication functions need to be integrated into a single mobile device. As shown in Figure 1, the mobile phone can be connected to the Wireless Local Area Network (WLAN) via the Wireless Fidelity (WiFi) module, and at the same time via the Bluetooth (BT) module and the Bluetooth Bud microphone (or Bluetooth car audio, or other Bluetooth devices) for communication. Usually the wireless area network system is built inside the building as an extension of the local area network (Local Area Network), and provides the last few meters of connection between the wired area network and mobile or fixed devices. According to the 802.11 standard formulated by the Institute of Electrical and Electronic Engineers (IEEE), most wireless local area network systems can operate in the 2.4 GHz unlicensed frequency band, and when coexisting Bluetooth modules are communicating at the same time , The coexistence interference caused by the Bluetooth signal will seriously affect the transmission rate of the wireless LAN system. Referring to Figure 1, the wireless area network is constructed by an access point (AP), and the access point is constructed by an Ethernet cable (Ethernet cable) connected to the wired LAN. Generally speaking, the access point receives, buffers, and transmits data between the wireless LAN and the wired network infrastructure. An access point can support an average of 20 devices, and its coverage area is 20 meters in an area with obstacles such as walls, stairs, elevators, etc., and in an area with clear line of sight (area with clear line of sight). Up to 100 meters. Bluetooth is an open wireless agreement used to exchange data between mobile or fixed devices within a short distance and establish a Personal Area Network (PAN). The mobile phone can receive Voice over Internet Protocol (VoIP) data through the wireless LAN module, and then send the Internet phone data to the Bluetooth microphone through the established personal area network, and vice versa. Or, the mobile phone can send digital music to the Bluetooth microphone to play through the established personal area network. It should be noted that both wireless LAN and Bluetooth occupy part of the 2.4 GHz Industrial, Scientific, and Medical (ISM) frequency band, which is 83 MHz bandwidth. In view of cost and component placement space considerations, modern electronic devices (such as mobile phones, ultra-small mobile personal computers (Ultra-Mobile PC, UMPC) or other) usually equipped with wireless network and Bluetooth module share a single antenna instead of using different antennas.

As shown in the example shown in Figure 2, the Bluetooth system uses Frequency Hopping Spread Spectrum (FHSS) technology and allows frequency hopping between 79 channels with different 1 MHz bandwidths in the Bluetooth spectrum. The wireless local area network does not use frequency hopping spread spectrum technology, but uses Direct Sequence Spread Spectrum (DSSS) technology. The carrier of the wireless local area network system maintains a channel with a 22 MHz bandwidth as the center. When the wireless LAN module and the Bluetooth module are operating in the same area at the same time, as shown in Figure 2, the frequency range occupied by a single 22 MHz bandwidth channel of the wireless LAN is the same as the 79 1 MHz channels of Bluetooth The 22 channels in the bandwidth channel are the same. Therefore, when the frequency band occupied by Bluetooth transmission happens to fall within the frequency band occupied by wireless local area network transmission, a certain degree of interference may be caused, and the degree of interference depends on the strength of the signal. Since the wireless LAN module and the Bluetooth module share the same frequency spectrum and share the same antenna, it is urgent to avoid interference between the two modules.

Figure 3 is a schematic diagram showing the operational conflict between the wireless LAN and the Bluetooth communication service sharing a single antenna. In Figure 3, the shared single antenna is used to switch between the wireless LAN and Bluetooth communication services to send and receive data at a fixed time slot. If the Bluetooth communication service is used to carry real-time voice data such as Synchronous Connection-Oriented (SCO) packets (transmission: marked as SCO T, ACL T in the figure; receiving: marked in the figure) SCO R, ACL R), the Bluetooth communication service has a higher priority than the wireless LAN communication service. In this case, when the wireless LAN sending and receiving process and the Bluetooth sending and receiving process occur at the same time, the transmission slot will be allocated to the Bluetooth sending and receiving process, and the wireless LAN sending and receiving process will be blocked. As shown in Figure 3, the receiving task 1 of the wireless LAN (labeled as Rx 1 in the figure) occurs in the slot when the Bluetooth communication service is idle. Therefore, the execution of receiving task 1 will not be disturbed, and further The confirmation message 2 is sent to the access point of the wireless local area network (for example, the access point in Figure 1) as a reply message indicating that the reception operation 1 has been completed. After receiving operation 1, another receiving operation 3 (marked as Rx in the figure) occurs 2). Since the Bluetooth communication service is still idle, the receiving job 3 is also not disturbed. However, since the confirmation message 4 in response to the receiving operation 3 and the upcoming Bluetooth transmission operation occupy the same time slot, the confirmation message 4 cannot be returned to the access point of the wireless LAN, and the receiving operation 3 is regarded as a failure. . Because the receiving operation fails, the access point of the wireless local area network retransmits the data at a lower transmission rate in order to successfully transmit the data to the mobile phone. But disadvantageously, because the re-executed receiving operation 5 has an extended operation time zone, it is more likely to overlap with the Bluetooth transceiver time slot, which will lead to another attempt of receiving operation 3 and cause repeated time slot overlap. . As a result, since the wireless LAN and Bluetooth communication services share a single antenna, the transmission volume of the wireless LAN will be greatly reduced.

An embodiment of the present invention provides a mobile communication system including a first wireless communication module and a second wireless communication module. The first wireless communication module transmits or receives a first wireless signal in a first frequency band within a first frequency range. The second wireless communication module transmits or receives a second wireless signal in a second frequency band within a second frequency range, and a frequency difference between the first frequency band and the second frequency band is a predetermined range Adjust the transmission power of one of the above-mentioned second wireless signals.

Another embodiment of the present invention provides a method for reducing signal interference, which is suitable for a mobile communication device including a plurality of wireless communication modules. The method for reducing interference includes the following steps: A first wireless signal is transmitted or received in a first frequency band in a frequency range, and a second wireless signal is transmitted or received in a second frequency band in a second frequency range by a second wireless communication module; Determining whether a frequency gap between the first frequency band and the second frequency band is within a preset range; and adjusting a transmission power of the second wireless signal when the frequency gap is within the preset range.

Another embodiment of the present invention provides a mobile communication system including a first wireless communication module and a second wireless communication module. The first wireless communication module transmits or receives a plurality of first wireless signals. The second wireless communication module transmits or receives a plurality of second wireless signals, and adjusts the transmission power of one of the second wireless signals when one of the signal indicators of the first wireless signal or the second wireless signal meets a preset condition .

Regarding other additional features and advantages of the present invention, those skilled in the art, without departing from the spirit and scope of the present invention, can do according to the mobile communication system disclosed in the implementation method of this case and the method of reducing signal interference. Obtained with a few changes and refinements.

The description in this chapter is the best way to implement the present invention. The purpose is to explain the spirit of the present invention and not to limit the scope of protection of the present invention. .

FIG. 4 is a schematic diagram of a communication system in which dual wireless communication modules share a single antenna according to an embodiment of the present invention. The communication system 400 includes an antenna 10, a switching device 20, a connection device 30, and a wireless communication chip 100. The wireless communication chip 100 includes a control unit 110, a wireless LAN module 120, a Bluetooth module 130, a separator 140, a wireless LAN transmission front-end (front-end) 151, and a wireless LAN/Bluetooth receiving front-end 152 , Bluetooth transmission front end 153 and 155, Bluetooth receiving front end 154, balanced voltage transformation (balun) unit 161, and balanced voltage transformation and switching units 162 and 163. Among them, the balanced transformation unit 161 and the balanced transformation and switching units 162 and 163 each include a balance transformer for converting a balanced (relative to the ground potential) electronic signal into an unbalanced (unilateral) signal , Or vice versa. The balanced transformer unit 161 is connected as one of the input and output ports of the wireless communication chip 100 (labeled as port 1 in the figure), and the balanced transformer and switching units 162 and 163 are respectively connected as the other input and output ports of the wireless communication chip 100 (Marked as port 2 and port 3 in the figure). The switching device 20 and the connecting device 30 can be further integrated into a path selection circuit and configured on a printed circuit board (PCB).

The wireless LAN module 120 and the Bluetooth module 130 are connected to each other to communicate their operating status and power control information, so that the transmission power used by one of the wireless LAN module 120 and the Bluetooth module 130 can be appropriately Adjust to reduce the signal interference caused by the other. The wireless local area network transmission front end 151 is connected to the wireless local area network module 120, and performs transmission-related front-end functions, such as modulation of the transmission carrier signal. The wireless LAN/Bluetooth reception front-end 152 is connected to the splitter 140 and performs reception-related front-end functions, such as demodulation of the received carrier signal. The splitter 140 is used to separate the wireless LAN reception signal and the Bluetooth reception signal from the combined signal from the wireless LAN/Bluetooth reception front end 152, and direct the separated signals to the wireless LAN module 120 and Bluetooth module 130. Similarly, the Bluetooth transmission front-ends 153 and 155 are connected to the Bluetooth module 130 and perform transmission-related front-end functions, and the Bluetooth receiving front-end 154 is connected to the Bluetooth module 130 and perform reception-related front-end functions. Among them, the operating status of the wireless LAN transmission front end 151, the wireless LAN/Bluetooth reception front end 152, the Bluetooth transmission front ends 153 and 155, and the Bluetooth reception front end 154 are controlled by the control unit 110. By setting the operation status to "On", the corresponding front-end unit can be activated. On the contrary, if the operation status is set to "Off", the corresponding front-end unit can be closed. Or, you can set the operating state to "sleep" to make the corresponding front-end unit enter the idle state. In the idle state, most of the circuits are turned off and only operate at a low rate clock to reduce the power consumption . It should be understood that when the operation status is set to "off" or "sleep", the corresponding front-end unit will not have the ability to transmit or receive. The control unit 110 can also serve as a packet traffic arbiter (Packet Traffic Arbitrator, PTA) to receive the communication request from the wireless LAN module 120 and the Bluetooth module 130, and determine whether the wireless LAN communication request conflicts with the Bluetooth communication request within a time period . If there is a conflict, the controller 110 determines whether to allow both of the communication requests at the same time, or only allow one of them, depending on the frequency band, priority level, operation type (for example, transmission/reception operation), power level or others of the communication service request Request for traffic and reject another request for traffic. In addition, the controller 110 further controls the switching device 20 to connect the contact 22 to the contact 24 or 26, controls the balance transformer and switching unit 162 to connect the contact 162-2 to the contact 162-4 or 162-6, And controlling the balance transformer and switching unit 163 to connect the contact 163-2 to the contact 163-4 or 163-6. By controlling the switching device 20, the balanced transformer and switching units 162 and 163, and controlling the wireless LAN transmission front end 151, the wireless LAN/Bluetooth receiving front end 152, the Bluetooth transmission front ends 153 and 155, and the Bluetooth receiving front end 154. In the operating state, the controller 110 can determine the antenna paths of the wireless LAN module 120 and the Bluetooth module 130 accordingly. It should be understood that, in order to reduce the hardware cost, the controller 110 can be integrated into the wireless LAN module 120 or the Bluetooth module 130.

The switching device 20 can be implemented by a Single-Pole Double Thrown (SPDT) switch, which includes three contacts 22, 24, and 26, and can selectively connect the contact 22 to the contact 24 Or 26, as shown in Figure 5A. In addition, the contacts 24 and 26 are further connected to the port 1 and the port 2 of the wireless communication chip 100, respectively. In other embodiments, the switching device 20 can also be implemented by a Double-Pole Double Thrown (DPDT) switch. As shown in Figure 5B, the contact 24 can be selectively connected to The contact 22 or 28 or the contact 26 can be selectively connected to the contact 22 or 28, and the contact 28 can be further coupled or connected to an external node for impedance matching.

The connection device 30 includes ports 32, 34, 36, and is used to couple the ports 32 and 34 to form a transmission and reception path (through path) and to couple the ports 32 and 36 to form another transmission and reception path (coupling In a coupled path), the ports 34 and 36 are isolated from each other and the isolation loss is about 20 decibels, and the electronic signal passing through the ports 34 and 36 has an attenuation of 6 to 10 decibels. Referring to Fig. 6A, the connecting device 30 may include an attenuator to attenuate the electronic signal through the ports 32 and 36 by 20 decibels. Alternatively, the connection device 30 may include a directional coupler, as shown in FIG. 6B, in which the ports 32 and 34 are connected by a straight path, the port 36 and the external node 38 are connected by a straight path, and the ports 32 and 36 are connected by a straight path. The coupling path is coupled, and the ports 34 and 36 are isolated from each other (isolation loss is about 20 to 40 decibels). The through path can be a direct or indirect through path and the external node 38 can be a resistor (for example, a 50 ohm resistor, Or equivalent to the end point of 50 ohms). It should be noted that the through path between ports 32 and 34 may have a path loss of about 0.5 decibels, and the coupling path between ports 32 and 36 may have a path loss of about 10 decibels. Alternatively, the through path between ports 32 and 34 may have a path loss of about 1.2 decibels, and the coupling path between ports 32 and 36 may have a path loss of about 6 decibels.

Figures 7A and 7B are schematic diagrams showing the embodiment of the directional coupler in Figure 6B. As shown in Figure 7A, by using two very close transmission lines, the electronic signal (or energy) leading from port 32 (connected to an input port) to port 34 (connected to a transmission port) is coupled To port 36 (connect to a coupling port). Similarly, as shown in Figure 7B, the electronic signal (or energy) directed from the port 36 (connected to an input port) to the transmission port (such as port 38 in Figure 6B) is coupled to the port 32 (connected to A coupling port) and isolated from the port 34 (connected to an isolation port) so that the coupled signal can be added to the electronic signal passing through the ports 32 and 34.

In addition to the attenuator (Figure 6A) and the directional coupler (Figure 6B), the connecting device 30 can be implemented as a power divider. The ports 34 and 36 are isolated from each other and theoretically each have a value of 3 decibels. Loss (actually 3.5 decibels). Furthermore, the connecting device 30 can also be implemented in a power splitter. The structure of the power divider is similar to that of the power divider, but the losses generated between the output ports of the two are different. With a power splitter, the loss of ports 34 and 36 is different. For example, port 36 can have a loss of 10 decibels, while port 34 can have a loss of 0.5 decibels, or port 36 can have a loss of 6 decibels, and port 34 can have a loss of 6 decibels. There may be a loss of 1 decibel. In addition, the connecting device 30 can be realized by a printed circuit pad (PCB pad) with one input port and two output ports. According to design requirements, one of the output ports has<i>N</i>The loss in decibels, and the other output port has a loss of 1 decibel or less. It should be noted that the power splitter can be implemented using a directional coupler (for example, the directional coupler in Figure 6B), where the port 38 is connected to a resistor for impedance matching and the ports 34 and 36 are isolated from each other. As shown in Figure 6B, using a directional coupler to implement a power splitter, port 36 can have a loss of 10 decibels, and port 34 can have a loss of 0.5 decibels, or port 36 can have a loss of 6 decibels, and port 34 There may be a loss of 1 decibel.

Figures 8A to 8C are flowcharts of a method for reducing signal interference according to an embodiment of the present invention. Although this method is illustrated by the communication system 400 shown in Figure 4, the present invention is not limited to this. Other antenna structures or transceiver structures with two or more coexisting communication modules can also be applied to the present invention. The method to reduce signal interference. At the beginning of the procedure, when the wireless LAN module 120 is connected to the access point, it determines the frequency band used to transmit or receive the wireless LAN signal (step S801). The channel table determines the frequency band. In some cases (for example, when the wireless local area network module 120 is set in accordance with the 802.11n standard), the wireless local area network module 120 determines the frequency band and its primary channel (primary channel) and auxiliary Channel channel). After the frequency band is determined, the wireless LAN module 120 then calculates the in-band range of the Bluetooth received signal and the wireless LAN received signal (step S802). The in-band range of the Bluetooth received signal indicates The Bluetooth receiving signal in which frequency range will receive the near-frequency interference from the wireless LAN transmission signal, and the near-frequency range of the wireless LAN receiving signal indicates the frequency range in which the wireless LAN receiving signal will receive The near-frequency interference from the Bluetooth transmission signal will be further described in Figures 9A and 9B. In one embodiment, when the wireless LAN signal and the Bluetooth signal are transmitted or received at the same frequency, the above-mentioned near-frequency interference will occur. In another embodiment, when the wireless LAN signal and the Bluetooth signal are transmitted or received in adjacent frequencies, the above-mentioned near-frequency interference will be generated. By calculating the near-frequency range of the Bluetooth received signal and the wireless LAN received signal, the wireless LAN module 120 can generate two channel mapping tables (bitmap) for indicating the near-frequency range of the Bluetooth received signal. The channel mapping table One is used to indicate which channel the Bluetooth receiving signal transmitted will receive near-frequency interference from the wireless LAN transmission signal transmitted on the main channel, and the second of the channel mapping table is used to indicate which channel The Bluetooth receiving signal transmitted by the channel will receive near-frequency interference from the wireless LAN transmission signal transmitted on the auxiliary channel. Similarly, the wireless local area network module 120 can generate two channel mapping tables for indicating the near-frequency range of the wireless local area network reception signal. One of the channel mapping tables is used to indicate which channel the Bluetooth transmission signal is transmitted on. It will receive near-frequency interference from the wireless LAN reception signal transmitted on the main channel, and the second part of the channel mapping table is used to indicate which channel the bluetooth transmission signal transmitted on the auxiliary channel will be received. The wireless local area network received signal near-frequency interference. Next, the wireless local area network module 120 transmits the Bluetooth receiving signal and the near frequency range of the wireless local area network receiving signal to the Bluetooth module 130 (step S803). After receiving the near-frequency range of the Bluetooth reception signal and the wireless LAN reception signal, it is determined whether the Bluetooth module 130 needs to perform a transmission operation or a reception operation in an upcoming time period (step S804). If the Bluetooth module 130 occupies the time period and wants to perform the receiving operation, the Bluetooth module 130 will receive the signal according to the near-frequency range of the Bluetooth signal and the traffic mode of the Bluetooth signal (traffic mode). pattern) determines whether there will be near-frequency interference caused by potential wireless LAN transmission signals in the time period (step S805). In one embodiment, the Bluetooth module 130 can determine whether there is a close frequency range by checking whether any of the subsequent N frequency hopping channels used by the Bluetooth receiving signal is in the near frequency range of the Bluetooth receiving signal. Frequency interference, that is, if any of the subsequent N frequency hopping channels used by Bluetooth to receive signals falls into or near the frequency band of wireless LAN transmission signals, there may be potential wireless LAN transmission signals Near-frequency interference caused by. After determining whether there will be near-frequency interference, the Bluetooth module 130 transmits the determined result and the signal indicator of the Bluetooth received signal to the wireless LAN module 120 (step S806). In one embodiment, the Bluetooth module 130 can also send the Bluetooth received signal's communication mode information (including the start time, duration, and repetition interval of the Bluetooth received signal) to the wireless LAN module 120. After receiving the determination result, it is determined whether the wireless local area network module 120 needs to perform a transmission operation within the time period (step S807). If yes, the wireless local area network module 120 adjusts the transmission power of the wireless local area network transmission signal according to the determination result and the signal indicators of the Bluetooth received signal and the wireless local area network transmission signal. Specifically, the first decision is whether the decision result is It indicates the possibility of near-band interference (step S808). If the result of the decision indicates that the wireless LAN transmission signal may cause near-band interference to the Bluetooth reception signal, the wireless LAN module 120 will respond to the Bluetooth reception signal and The signal index of the wireless local area network transmission signal reduces the transmission power of the wireless local area network transmission signal, so that the Bluetooth reception signal can be successfully received (step S809). In addition, the wireless local area network module 120 can further based on the Bluetooth reception signal. The mode information determines when to reduce the transmission power of the wireless LAN transmission signal. Conversely, if the determination result indicates that the wireless LAN transmission signal will not cause near-frequency interference to the Bluetooth reception signal, the wireless LAN module 120 can use normal power to transmit the wireless LAN transmission signal (step S810). In step S807, if the wireless LAN module 120 does not need to perform the transmission operation, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the above-mentioned Bluetooth received signal and wireless LAN transmission signal may include the signal: Received Signal Strength Indicator (Received Signal Strength Indicator) Indication, RSSI), Signal to Noise Ratio (SNR), Adjacent Channel Interference (ACI), Packet Error Rate (PER), or Bit Error Rate (Bit Error Rate, BER). In other embodiments, the transmission power adjustment of the wireless LAN transmission signal can also be based on the frequency offset between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the Bluetooth received signal and The transmission and reception of the wireless LAN transmission signal modulates the type of modulation.

FIG. 9A is a schematic diagram of power adjustment of a wireless local area network transmission signal according to an embodiment of the present invention. As shown in Figure 9A, the wireless LAN transmission signal is transmitted in the frequency range f1, and the Bluetooth reception signal is received in a frequency hopping frequency sequence. The transmission power adjustment of the wireless LAN transmission signal is determined according to the frequency difference between the wireless LAN transmission signal and the Bluetooth receiving signal. The near-frequency range of the Bluetooth receiving signal (marked as f1' in the figure) indicates the frequency range in which the frequency hopping channel of the Bluetooth receiving signal falls into which near-frequency interference will occur. The near-frequency range f1' can be based on the wireless LAN The operating frequency range and anti-interference ability of the module 120 and the Bluetooth module 130 are determined. As shown in Figure 9A, when the frequency hopping channel of the Bluetooth receiving signal is not within the close frequency range f1' (marked by a solid arrow in the figure), or when the frequency of the frequency hopping channel of the Bluetooth receiving signal and the wireless zone When the frequency difference between the frequency range f1 of the network transmission signal is greater than d1, the wireless local area network module 120 can use the normal transmission power P1 to transmit the wireless local area network transmission signal without causing near-frequency interference to the Bluetooth reception signal; When the frequency hopping channel of the Bluetooth receiving signal is in the near frequency range f1' (marked by the dotted arrow in the figure), or when the frequency of the frequency hopping channel of the Bluetooth receiving signal is between the frequency range of the wireless LAN transmission signal f1 When the frequency difference of is less than or equal to d1, the wireless local area network module 120 can reduce the transmission power from P1 to P2 to reduce the near-frequency interference caused by the bluetooth receiving signal. In addition, although not shown, the wireless LAN module 120 can further reduce its transmission power to further reduce the near-frequency interference to the Bluetooth receiving signal when the frequency hopping channel of the Bluetooth receiving signal is in the near-frequency range f1. . In addition to the frequency gap, the transmission power adjustment of the wireless LAN transmission signal can also be determined according to the transmission or reception modulation type of the wireless LAN transmission signal and/or Bluetooth reception signal. It should be noted that the above-mentioned reduction in the transmission power of the wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so that at least the Bluetooth module 130 can successfully receive the Bluetooth. The received signal shall prevail. For example, as shown in Figure 10A, the area R1 represents the condition that both the wireless LAN signal and the Bluetooth signal have good signal quality, which means that both the wireless LAN signal and the Bluetooth signal have high received signal strength indicators. At the threshold value; the area R2 represents the condition that both the wireless LAN signal and the Bluetooth signal have poor signal quality, which means that the received signal strength indicator of the wireless LAN signal and the Bluetooth signal is lower than the threshold value. In the area R1, the straight line L1 represents the signal corresponding to the wireless LAN signal and the blue The wireless LAN transmission power indicated by the received signal strength of the bud signal. The wireless LAN transmission power can increase or decrease with the increase or decrease of the received signal strength indicator of the Bluetooth signal. The slope of the straight line L1 can be adjusted according to the wireless zone. The anti-noise ability of the network module 120 and the Bluetooth module 130 is determined. In area R2, since both the wireless LAN signal and the Bluetooth signal have poor signal quality, even if the transmission power of the wireless LAN transmission signal is reduced, it may not help the reception of the Bluetooth signal. The communication request between the LAN module 120 and the Bluetooth module 130 is appropriately arbitrated. Since after arbitration, only one module is in operation in a period of time, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal, such as a straight line L1'. In another embodiment, the transmission power of the wireless local area network transmission signal can be adjusted hierarchically. When the received signal strength indicator of the wireless local area network signal and the Bluetooth signal is within a first predetermined range, the wireless local area network transmission signal Adjust the transmission power of the wireless local area network signal to the first level; when the received signal strength indicator of the wireless LAN signal and Bluetooth signal is within the second predetermined range, adjust the transmission power of the wireless local area network transmission signal to the second level. analogy. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and the Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as: signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate. ; When the received signal strength indicator of the wireless local area network signal and the Bluetooth signal is within the second predetermined range, adjust the transmission power of the wireless local area network transmission signal to the second level, and so on. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as: signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate. ; When the received signal strength indicator of the wireless local area network signal and the Bluetooth signal is within the second predetermined range, adjust the transmission power of the wireless local area network transmission signal to the second level, and so on. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and the Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as: signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate.

In step S804, if the Bluetooth module 130 wants to perform a transmission operation within the time period, the Bluetooth module 130 prepares the communication parameters of the Bluetooth transmission signal and transmits it to the wireless LAN module 120 (step S811). The communication parameters of the Bluetooth transmission signal include information such as when the Bluetooth transmission signal will be transmitted, the power level used, the modulation type, and the transmission channel. When receiving the communication parameters of the Bluetooth transmission signal from the Bluetooth module 130, the wireless LAN module 120 determines whether to perform the receiving operation within the time period (step S812), and if so, the Bluetooth module 130 according to The near-frequency range and traffic parameters of the wireless LAN received signal determine whether the Bluetooth transmission signal will cause near-frequency interference to the wireless LAN received signal in the time period (step S813), if so, the Bluetooth module 130 Reduce the transmission power of the Bluetooth transmission signal according to the signal indicators of the wireless LAN reception signal and the Bluetooth transmission signal, so that the wireless LAN reception signal can be successfully received (step S814); on the contrary, if the bluetooth transmission signal is received within the time period The Bluetooth transmission signal does not cause near-frequency interference to the wireless LAN reception signal, and the Bluetooth module 130 can use the normal transmission power to transmit the Bluetooth transmission signal (step S815). In step S812, if not, the process returns to the starting point and waits for subsequent traffic requests from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth transmission signal and the wireless LAN reception signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the Bluetooth transmission signal can also be adjusted according to the frequency difference between the frequency or channel used by the Bluetooth transmission signal and the wireless LAN reception signal, or the modulation type used.

FIG. 9B is a schematic diagram of power adjustment of a Bluetooth transmission signal according to an embodiment of the present invention. As shown in Figure 9B, the wireless LAN reception signal is transmitted in the frequency range f2, and the Bluetooth transmission signal is received in a frequency hopping frequency sequence. The near-frequency range of the wireless LAN received signal (marked as f2' in the figure) indicates which frequency range the frequency hopping channel of the Bluetooth transmission signal falls into, which will cause near-frequency interference to the wireless LAN received signal, and the near-frequency range f2 'It can be determined according to the operating frequency range and anti-interference ability of the wireless LAN module 120 and the Bluetooth module 130. As shown in Figure 9B, when the frequency hopping channel of the Bluetooth transmission signal is not in the near frequency range f2' (marked with a solid arrow in the figure), or when the frequency and wireless zone of the Bluetooth transmission signal are hopping channel When the frequency difference between the frequency range f2 of the network reception signal is greater than d2, the Bluetooth module 130 can use the normal transmission power P3 to transmit the Bluetooth transmission signal without causing near-frequency interference to the wireless LAN reception signal; When the frequency hopping channel of the Bluetooth transmission signal is in the near frequency range f2' (marked by the dotted arrow in the figure), or when the frequency of the Bluetooth transmission signal is between the frequency hopping channel frequency of the Bluetooth transmission signal and the frequency range f2 of the wireless LAN reception signal When the frequency difference is less than or equal to d2, the Bluetooth module 130 can reduce the transmission power from P3 to P4 to reduce the near-frequency interference caused by the received signal of the wireless local area network. In addition, although not shown, the Bluetooth module 130 can further reduce its transmission power to further reduce the near-frequency interference to the wireless LAN reception signal when the frequency hopping channel of the Bluetooth transmission signal is in the near-frequency range f2 . In addition to the frequency gap, the transmission power adjustment of the Bluetooth transmission signal can also be determined according to the transmission or reception modulation type of the Bluetooth transmission signal and/or wireless LAN reception signal. It should be noted that the above-mentioned reduction in the transmission power of the Bluetooth transmission signal should be such that the near-frequency interference caused by the wireless LAN reception signal is reduced, so as to at least satisfy the wireless LAN module 120 successfully receiving the wireless The local area network received signal shall prevail. For example, as shown in Figure 10B, the area R1 represents the condition that both the wireless LAN signal and the Bluetooth signal have good signal quality, which means that the received signal strength of the wireless LAN signal and the Bluetooth signal are both high. At the threshold value; the area R2 represents the condition that both the wireless LAN signal and the Bluetooth signal have poor signal quality, which means that the received signal strength indicators of the wireless LAN signal and the Bluetooth signal are lower than the threshold value. In the area R1, the straight line L1 represents the Bluetooth transmission power corresponding to the received signal strength indicator of the wireless LAN signal and the Bluetooth signal. The Bluetooth transmission power can follow the Bluetooth signal The received signal strength indicator is enhanced and decreased (meaning that when the received signal strength indicator of the Bluetooth signal is high, it means that the distance between it and the communication device of the same level (peer) is short, so a smaller transmission power can be used), And increase with the decrease of the received signal strength indicator of the Bluetooth signal (meaning that when the received signal strength indicator of the Bluetooth signal is low, it means that the distance between it and the communication device of the same level is long, so it can be used larger The transmission power). The slope of the straight line L2 can be determined according to the anti-interference ability of the wireless LAN module 120 and the Bluetooth module 130. In area R2, since both the wireless LAN signal and the Bluetooth signal have poor signal quality, even if the transmission power of the Bluetooth transmission signal is reduced, it may not help the wireless LAN reception signal. The communication request between the LAN module 120 and the Bluetooth module 130 is appropriately arbitrated. Since after arbitration, only one module is in operation in a period of time, the Bluetooth module 130 can use normal power to transmit the Bluetooth transmission signal, such as a straight line L2'. In another embodiment, the transmission power of the Bluetooth transmission signal can be adjusted hierarchically. When the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within a first predetermined range, the Bluetooth transmission signal is transmitted The power is adjusted to the first level; when the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within the second predetermined range, the transmission power of the Bluetooth transmission signal is adjusted to the second level, and so on. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate. 130 request for proper arbitration. Since after arbitration, only one module is in operation in a period of time, the Bluetooth module 130 can use normal power to transmit the Bluetooth transmission signal, such as a straight line L2'. In another embodiment, the transmission power of the Bluetooth transmission signal can be adjusted hierarchically. When the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within a first predetermined range, the Bluetooth transmission signal is transmitted The power is adjusted to the first level; when the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within the second predetermined range, the transmission power of the Bluetooth transmission signal is adjusted to the second level, and so on. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate. 130 request for proper arbitration. Since after arbitration, only one module is in operation in a period of time, the Bluetooth module 130 can use normal power to transmit the Bluetooth transmission signal, such as a straight line L2'. In another embodiment, the transmission power of the Bluetooth transmission signal can be adjusted hierarchically. When the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within a first predetermined range, the Bluetooth transmission signal is transmitted The power is adjusted to the first level; when the wireless LAN signal and the received signal strength indicator of the Bluetooth signal are within the second predetermined range, the transmission power of the Bluetooth transmission signal is adjusted to the second level, and so on. Although the above embodiment uses the received signal strength indicator of the wireless LAN signal and Bluetooth signal as the basis for adjusting the transmission power, other signal indicators can also be used as the basis for adjusting the transmission power, such as: signal-to-noise ratio, adjacent channel interference , Packet error rate, or bit error rate.

Figures 11A to 11C are flowcharts of a method for reducing signal interference according to another embodiment of the present invention. Similar to steps S801 to S803 in Figure 8, the method of this embodiment starts with the wireless LAN module 120 and the Bluetooth module 130 to obtain the Bluetooth receiving signal and the wireless LAN receiving signal in the near frequency range ( Steps S1101~S1103). Then, it is determined whether the power needs to be adjusted according to the communication parameters and signal indicators of the wireless LAN module 120 and the Bluetooth module 130 (step S1104), if yes, the process continues to step S1105, if not, the process ends. In this embodiment, the power adjustment is performed when the received signal strength indicator of the Bluetooth received signal and the wireless LAN received signal are both higher than a better quality threshold, that is, the received signal strength indicator is higher than the higher quality threshold. The good quality threshold means that the signal strength of the Bluetooth reception signal and the wireless LAN reception signal is good enough to withstand some interference without affecting the successful reception of the Bluetooth reception signal and the wireless LAN reception signal. In another embodiment, when the received signal strength indicator of the Bluetooth received signal or the wireless LAN received signal is lower than a normal quality threshold, and the Bluetooth received signal or the wireless LAN received signal is used to carry real-time applications, The power adjustment is not necessary, that is, the received signal strength indicator is lower than the ordinary quality threshold, which means that the signal strength of the Bluetooth receiving signal or the wireless area network receiving signal is too weak to withstand any interference, even if the transmission mode is reduced. The transmission power used by the group may still cause the Bluetooth reception signal and the wireless LAN reception signal to fail to be successfully received. At the same time, if the Bluetooth reception signal or the wireless LAN reception signal is used to carry real-time applications, it means that the data in the signal should be regarded as important, and the successful reception of the signal must be the first priority. In step S1104, if it is determined to adjust the power, a series of checks on the operating status, communication parameters, and signal indicators of the wireless LAN module 120 and the Bluetooth module 130 are required to determine the wireless LAN module 120 Whether there will be near-frequency interference between the Bluetooth module 130 and the Bluetooth module 130, specifically, it is determined whether the Bluetooth module 130 will perform a transmission operation or a reception operation in the upcoming time period (step S1105). When the module 130 occupies the time period and wants to perform the receiving operation, the Bluetooth module 130 determines whether there will be a potential wireless LAN transmission signal in the time period according to the near-frequency range of the Bluetooth received signal and the communication mode. The resulting near-frequency interference (step S1106). In one embodiment, the Bluetooth module 130 can check the next N hopping frequencies of the Bluetooth received signal Whether the channel falls into the near-frequency range of the Bluetooth received signal to determine whether near-frequency interference will occur, that is, if the next N frequency hopping channels of the Bluetooth received signal are located at or near the frequency band of the wireless LAN transmission signal, There may be a potential wireless LAN transmission signal that will cause near-frequency interference to the Bluetooth reception signal. After determining whether near-frequency interference will occur, the Bluetooth module 130 transmits the determination result and the signal indicator of the Bluetooth received signal to the wireless local area network module 120 (step S1107). In one embodiment, the Bluetooth module 130 can also send the Bluetooth received signal's communication mode information, including the start time, duration, and repetition interval of the communication, to the wireless LAN module 120. When receiving the determination result, the wireless local area network module 120 then determines whether to perform the transmission operation in the time period (step S1108). The signal index of the network transmission signal is used to adjust the transmission power of the wireless LAN transmission signal. Specifically, the first decision is whether the result of the decision indicates that near-frequency interference may occur (step S1109). If so, the wireless LAN module 120 According to the signal indicators of the Bluetooth reception signal and the wireless LAN transmission signal, the transmission power of the wireless LAN transmission signal is reduced, so that the Bluetooth reception signal can be successfully received (step S1110). It should be noted that the reduction in the transmission power of the above wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so as to at least satisfy that the Bluetooth module 130 successfully receives the Bluetooth. The received signal shall prevail. In step S1109, if not, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal (step S1111). In step S1108, if not, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth received signal and the wireless LAN transmission signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the wireless LAN transmission signal can also be adjusted according to the frequency difference between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the modulation type used. After the frequency interference, the Bluetooth module 130 transmits the determination result and the signal indicator of the Bluetooth received signal to the wireless LAN module 120 (step S1107). In one embodiment, the Bluetooth module 130 can also send the Bluetooth received signal's communication mode information, including the start time, duration, and repetition interval of the communication, to the wireless LAN module 120. When receiving the determination result, the wireless local area network module 120 then determines whether to perform the transmission operation in the time period (step S1108). The signal index of the network transmission signal is used to adjust the transmission power of the wireless LAN transmission signal. Specifically, the first decision is whether the result of the decision indicates that near-frequency interference may occur (step S1109). If so, the wireless LAN module 120 According to the signal indicators of the Bluetooth reception signal and the wireless LAN transmission signal, the transmission power of the wireless LAN transmission signal is reduced, so that the Bluetooth reception signal can be successfully received (step S1110). It should be noted that the above-mentioned reduction in the transmission power of the wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so that at least the Bluetooth module 130 can successfully receive the Bluetooth. The received signal shall prevail. In step S1109, if not, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal (step S1111). In step S1108, if not, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth received signal and the wireless LAN transmission signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the wireless LAN transmission signal can also be adjusted according to the frequency difference between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the modulation type used. After the frequency interference, the Bluetooth module 130 transmits the determination result and the signal indicator of the Bluetooth received signal to the wireless LAN module 120 (step S1107). In one embodiment, the Bluetooth module 130 can also send the Bluetooth received signal's communication mode information, including the start time, duration, and repetition interval of the communication, to the wireless LAN module 120. When receiving the determination result, the wireless local area network module 120 then determines whether to perform the transmission operation within the time period (step S1108). If so, the wireless local area network module 120 determines whether to perform the transmission operation within the time period. The signal index of the network transmission signal is used to adjust the transmission power of the wireless LAN transmission signal. Specifically, the first decision is whether the result of the decision indicates that near-frequency interference may occur (step S1109). If so, the wireless LAN module 120 According to the signal indicators of the Bluetooth reception signal and the wireless LAN transmission signal, the transmission power of the wireless LAN transmission signal is reduced, so that the Bluetooth reception signal can be successfully received (step S1110). It should be noted that the reduction in the transmission power of the above wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so as to at least satisfy that the Bluetooth module 130 successfully receives the Bluetooth. The received signal shall prevail. In step S1109, if not, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal (step S1111). In step S1108, if not, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth received signal and the wireless LAN transmission signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the wireless LAN transmission signal can also be adjusted according to the frequency difference between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the modulation type used. Specifically, the first decision is whether the result of the decision indicates that near-frequency interference may occur (step S1109). If so, the wireless LAN module 120 based on the signal indicators of the Bluetooth received signal and the wireless LAN transmission signal To reduce the transmission power of the wireless LAN transmission signal, so that the Bluetooth reception signal can be successfully received (step S1110). It should be noted that the reduction in the transmission power of the above wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so as to at least satisfy that the Bluetooth module 130 successfully receives the Bluetooth. The received signal shall prevail. In step S1109, if not, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal (step S1111). In step S1108, if not, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth received signal and the wireless LAN transmission signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the wireless LAN transmission signal can also be adjusted according to the frequency difference between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the modulation type used. Specifically, the first decision is whether the result of the decision indicates that near-frequency interference may occur (step S1109). If so, the wireless LAN module 120 based on the signal indicators of the Bluetooth received signal and the wireless LAN transmission signal To reduce the transmission power of the wireless LAN transmission signal, so that the Bluetooth reception signal can be successfully received (step S1110). It should be noted that the reduction in the transmission power of the above wireless LAN transmission signal should be such that the near-frequency interference caused by the Bluetooth reception signal is reduced, so as to at least satisfy that the Bluetooth module 130 successfully receives the Bluetooth. The received signal shall prevail. In step S1109, if not, the wireless local area network module 120 can use normal power to transmit the wireless local area network transmission signal (step S1111). In step S1108, if not, the process returns to the initial state and waits for the next traffic request from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the Bluetooth received signal and the wireless LAN transmission signal may include the respective received signal strength indicator, signal-to-noise ratio, adjacent channel interference, packet error rate, and bit error rate. In other embodiments, the transmission power of the wireless LAN transmission signal can also be adjusted according to the frequency difference between the Bluetooth received signal and the frequency or channel used by the wireless LAN transmission signal, or the modulation type used.

In step S1105, if the Bluetooth module 130 occupies the time period and wants to perform the transmission operation, the Bluetooth module 130 prepares the communication parameters of the Bluetooth transmission signal and transmits it to the wireless LAN module 120 (step S1112), The communication parameters of the Bluetooth transmission signal include information such as when the Bluetooth transmission signal will be transmitted, the power level used, the modulation type, and the channel used for transmission. When receiving the communication parameters of the Bluetooth transmission signal from the Bluetooth module 130, the wireless LAN module 120 determines whether to perform the receiving operation within the time period (step S1113), and if so, the Bluetooth module 130 The near-frequency range of the received signal from the local area network and the traffic parameters determine whether the Bluetooth transmission signal will cause near-frequency interference to the received signal from the wireless local area network within the time period (step S1114). If so, the Bluetooth module 130 The signal indicators of the wireless local area network reception signal and the Bluetooth transmission signal reduce the transmission power of the Bluetooth transmission signal, so that the wireless local area network reception signal can be successfully received (step S1115); on the contrary, if the Bluetooth transmission signal is within the time period The transmission signal does not cause near-frequency interference to the wireless LAN reception signal, and the Bluetooth module 130 can use the normal transmission power to transmit the Bluetooth transmission signal (step S1116). In step S1113, if not, the process returns to the starting point and waits for subsequent traffic requests from the wireless LAN module 120 and the Bluetooth module 130. The signal indicators of the aforementioned Bluetooth transmission signal and wireless LAN reception signal may include respective received signal strength indicators, signal-to-noise ratio, adjacent channel interference, packet error rate, or bit error rate. In other embodiments, the transmission power of the Bluetooth transmission signal can also be adjusted according to the frequency difference between the frequency or channel used by the Bluetooth transmission signal and the wireless LAN reception signal, or the modulation type used. It should be noted that in steps S1109 and S1104, the reduction of the transmission power of the wireless LAN transmission signal and the Bluetooth transmission signal should be caused by the close frequency of the Bluetooth reception signal and the wireless LAN reception signal, respectively. The interference reduction is subject to at least satisfying that the Bluetooth module 130 and the wireless local area network module 120 successfully receive the Bluetooth receiving signal and the wireless local area network receiving signal, respectively.

Regarding the component settings and the connection settings between the components in the wireless communication chip 100, it should be noted that the wireless LAN module 120 has a transmission front end and a receiving front end, and the Bluetooth module 130 has two transmission front ends. And the receiving front end. After adjusting the transmission power as described above, the operation types of the transmission front end and the reception front end of the wireless local area network module 120 and the wireless local area network module 120 in the communication system 400 are then determined. Table 1 shows all combinations of potential types of operations performed by the communication system 400 in FIG. 4.

<tables><img file="twi508591b_d0001.tif" he="1293" id="i0001" img-content="drawing" img-format="tif" inline="yes" orientation="portrait" wi="1973" /></tables>

<tables><img file="twi508591b_d0002.tif" he="735" id="i0002" img-content="drawing" img-format="tif" inline="yes" orientation="portrait" wi="1981" /></tables>

In Table 1, "1" is true (TRUE), which means there is a corresponding job, and "0" is false (FALSE), which means there is no corresponding job. There is no job in case 1, so no description is needed. The situation types in Table 1 will be further explained in Figure 12.

Figures 12A to 12G are flow charts of the control unit 110 processing the coexistence between the wireless LAN module 120 and the Bluetooth module 130 according to an embodiment of the present invention. At the beginning of the procedure, first obtain the potential operation information of the wireless LAN module 120 and the Bluetooth module 130 in an upcoming time period (step S1201), and then perform a series of checks on the obtained information accordingly. To determine whether one or both of the wireless LAN module 120 and the Bluetooth module 130 occupies the time zone, and to determine whether the transmission/reception operation of the above one is in the same time zone as the other The transmission/reception job collided. Specifically, it is determined whether only the Bluetooth module 130 occupies the time segment to perform the transmission operation (step S1202), and if so, the control unit 110 sends a control signal to start the Bluetooth transmission in the time segment Front end 153, switch the balance transformer and switching unit 162 to the Bluetooth transmission front end 153, and switch the switching device 20 to port 2 (case 1) (step S1203), so that the Bluetooth transmission signal sequentially passes through the Bluetooth transmission front end 153 , Port 2, and the through path between ports 34 and 32 are transmitted from the Bluetooth module 130 to the antenna 10. In step S1202, if not, it is determined whether only the Bluetooth module 130 occupies the time period to perform the receiving operation (step S1204), if yes, the control unit 110 sends a control signal to start in the time period The wireless LAN/Bluetooth receiving front end 152, switching the balance transformer and switching unit 162 to the wireless LAN/Bluetooth receiving front end 152, and switching the switching device 20 to port 2 (case 2) (step S1205), so that The Bluetooth receiving signal is sequentially received from the antenna 10 to the Bluetooth module 130 via the direct path between the ports 32 and 34, the port 2, the wireless LAN/Bluetooth receiving front end 152, and the splitter 140. In step S1204, if not, it is determined whether only the wireless local area network module 120 occupies the time segment to perform the transmission operation (step S1206). If so, the control unit 110 sends a control signal to the time segment Activate the wireless LAN transmission front end 151 and switch the switching device 20 to port 1 (case 3) (step S1207), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, port 1, and one of ports 34 and 32. The direct path therebetween is transmitted from the wireless local area network module 120 to the antenna 10. In step S1206, if not, it is determined whether only the wireless local area network module 120 occupies the time segment to proceed.

In step S1208, if not, it means that the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period to perform their respective operations. However, when the wireless LAN transmission/reception operation or the Bluetooth transmission/ When receiving operations are in progress at the same time, the wireless LAN transmission/reception signal may interfere with the Bluetooth transmission/reception signal, and vice versa. Therefore, the greater the power required for the wireless LAN transmission signal, the greater the interference it will cause to the Bluetooth received signal, and vice versa. To this end, it is determined whether the operation status of the wireless LAN transmission/reception signal and the Bluetooth transmission/reception signal are within the range of simultaneous operation (step S1210). The above operation status can be the required power of wireless LAN transmission/reception signal or Bluetooth transmission/reception signal, received signal strength indicator, historical packet error rate, historical bit error rate, signal-to-noise ratio, signal-to-interference ratio (Interference-to-Signal Ratio, ISR). In addition, the above-mentioned operation status may be the number of reconnections of the wireless LAN transmission/reception operation or the Bluetooth transmission/reception operation recorded in the history.

It should be noted that the wireless LAN module 120 and the Bluetooth module 130 each occupy the time period for transmission and reception, or the wireless LAN module 120 and the Bluetooth module 130 each occupy the time. In the case of receiving and transmitting operations in the segment, if the power adjustment as described in Figure 8 is performed due to the potential near-frequency interference generated between the wireless LAN module 120 and the Bluetooth module 130, then The adjusted power can ensure that the operating status of the wireless LAN transmission/reception signal and the Bluetooth transmission/reception signal are within the range of simultaneous operation.

In step S1210, if yes, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 each occupy the time period for receiving and transmitting operations (step S1211). If yes, the control unit 110 sends a control signal to In this time period, the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth transmission front end 155 are activated, and the balanced transformer and switching units 162 and 163 are respectively switched to the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth transmission front end 155. And switch the switching device 20 to port 2 (case 5) (step S1212), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, port 2, wireless LAN/Bluetooth receiving front end 152, and the splitter 140 receive the wireless LAN module 120 from the antenna 10, and make the Bluetooth transmission signal from the Bluetooth module through the Bluetooth transmission front end 155, port 3, and the coupling path between ports 32 and 36 in turn 130 to the antenna 10 for transmission. In step S1211, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for receiving operations (step S1213). If yes, the control unit 110 sends a control signal to the In the time zone, the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth receiving front end 154 are activated, and the balanced transformer and switching units 162 and 163 are respectively switched to the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth receiving front end 154, And switch the switching device 20 to port 2 (case 6) (step S1214), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, port 2, wireless LAN/Bluetooth reception front end 152, And the splitter 140 receives the wireless LAN module 120 from the antenna 10, and makes the Bluetooth reception signal sequentially receive the Bluetooth from the antenna 10 via the coupling path between the ports 32 and 36, the port 3, and the Bluetooth reception front end 154 Module 130. In step S1213, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 occupy the time period for transmission and reception respectively (step S1215). If yes, the control unit 110 sends a control signal, In this time period, the wireless LAN transmission front end 151 and the Bluetooth receiving front end 154 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth receiving front end 154, and the switching device 20 is switched to port 1 (case 7) (Step S1216), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, the balanced transformer unit 161, the port 1, and the ports 32 and 3 The through path between 4 is transmitted from the wireless LAN module 120 to the antenna 10, and the Bluetooth receiving signal is received from the antenna 10 through the coupling path between ports 32 and 36, port 3, and the Bluetooth receiving front end 154 in turn Go to the Bluetooth module 130. In step S1215, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1217). If so, the control unit 110 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, and the switching device 20 is switched to port 1 (case 8) (step S1218) ), so that the wireless local area network transmission signal is transmitted from the wireless local area network module 120 to the antenna 10 through the wireless local area network transmission front end 151, the balanced transformer unit 161, the port 1, and the direct path between the ports 32 and 34 in sequence. And the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 through the Bluetooth transmission front end 155, the port 3, and the coupling path between the ports 32 and 36 in sequence.

In step S1210, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 each occupy the time period for receiving and transmitting operations (step S1219). If yes, the control unit 110 determines the wireless zone Whether the communication request of the network module 120 and the Bluetooth module 130 collide, and arbitrate which party's communication request should be allowed when the collision occurs (step S1220), if the communication request of the wireless LAN module 120 is allowed Service request, the control unit 110 sends a control signal to activate the wireless LAN/Bluetooth reception front-end 152, switch the balance transformer and switching unit 162 to the wireless LAN/Bluetooth reception front-end 152, and switch The switching device 20 switches to port 2 (case 9) (step S1221), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, port 2, wireless LAN/Bluetooth reception front end 152, and separation The receiver 140 receives the wireless local area network module 120 from the antenna 10. If the traffic request of the Bluetooth module 130 is allowed, the control unit 110 sends a control signal to activate the Bluetooth transmission front end 153 and switch the balance transformer and switching unit 163 to the Bluetooth transmission front end in the time period 153. And switch the switching device 20 to port 2 (case 9) (step S1222), so that the Bluetooth transmission signal is transmitted from the Bluetooth via the Bluetooth transmission front end 153, port 2, and the direct path between ports 32 and 34 in turn The module 130 transmits to the antenna 10. In step S1219, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for receiving operations (step S1223). If yes, the control unit 110 sends a control signal to the In the time zone, the wireless LAN/Bluetooth receiving front end 152 is activated, the balanced transformer and switching unit 162 is switched to the wireless LAN/Bluetooth receiving front end 152, and the switching device 20 is switched to port 2 (case 10) (step S1224), so that the combined signal is received from the antenna 10 to the splitter 140 via the direct path between the ports 32 and 34, the port 2, and the wireless LAN/Bluetooth receiving front end 152, and then the splitter 140 receives the splitter 140 from the combination The wireless LAN receiving signal and the Bluetooth receiving signal are separated from the signal, and they are forwarded to the wireless LAN module 120 and the Bluetooth module 130 respectively. In step S1223, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 occupy the time period for transmission and reception respectively (step S1225), and if yes, the control unit 110 Determine whether the communication request of the wireless LAN module 120 and the Bluetooth module 130 collide, and arbitrate which party's communication request should be allowed when the collision occurs (step S1226), if the wireless LAN module is allowed 120 traffic request, the control unit 110 sends a control signal to activate the wireless LAN transmission front end 151 and switch the switching device 20 to port 1 (case 11) (step S1227) in the time period, so that the wireless zone The network transmission signal is sequentially transmitted from the wireless local area network module 120 to the antenna 10 via the wireless local area network transmission front end 151, the balanced transformer unit 161, the port 1, and the direct path between the ports 32 and 34. If the traffic request of the Bluetooth module 130 is allowed, the control unit 110 is responsible for sending a control signal to activate the wireless LAN/Bluetooth receiving front end 152 and switch the balance transformer and switching unit 162 in the time period. To the wireless LAN/Bluetooth receiving front end 152, and switch the switching device 20 to port 2 (case 11) (step S1228), so that the Bluetooth receiving signal sequentially passes through the direct path between ports 32 and 34, port 2, The wireless LAN/Bluetooth receiving front end 152 and the splitter 140 receive the Bluetooth module 130 from the antenna 10. In step S1225, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1229), if yes, the control unit 110 determines the wireless LAN module Whether the communication request of 120 and the Bluetooth module 130 collides, and arbitrate which party's communication request should be allowed when the collision occurs (step S1230). If the allowed is the communication request of the wireless LAN module 120, The control unit 110 sends a control signal to activate the wireless LAN transmission front end 151 and switch the switching device 20 to port 1 (case 12) (step S1231) in this time period, so that the wireless LAN transmission signal sequentially passes through the wireless LAN. The direct path between the local area network transmission front end 151, the balanced transformer unit 161, the port 1, and the ports 32 and 34 is transmitted from the wireless local area network module 120 to the antenna 10. If the traffic request of the Bluetooth module 130 is allowed, the control unit 110 sends a control signal to activate the Bluetooth transmission front end 153 and switch the balance transformer and switching unit 162 to the Bluetooth transmission front end in the time period 153. And switch the switching device 20 to port 2 (case 12) (step S1232), so that the Bluetooth transmission signal is transmitted from the wireless zone through the Bluetooth transmission front end 153, port 2, and the direct path between ports 32 and 34 in sequence

Those skilled in the art should implement the connection device 30 on a 3-port power splitter (with an input port 32 and two output ports 34 and 36) to modify the design of the communication system 400, where the input port 32 and The first path between the output ports 34 has a first path loss, and the second path between the input port 32 and the output port 36 has a second path loss. If the power divider is a power divider with equivalent loss, the first path and the second path have the same path loss; if the power divider is a power divider with unequal losses, the first path and the second path have Different path losses. The coupling value of the power divider can be referred to as shown in Table 2:

<tables><img file="twi508591b_d0003.tif" he="1169" id="i0003" img-content="drawing" img-format="tif" inline="yes" orientation="portrait" wi="1086" /></tables>

Taking the coupling value of 3 dB (3 dB directional coupler) as an example, the through path has a path loss of about 3 dB, and the coupled path also has a path loss of about 3 dB; taking a 6 dB directional coupler as an example, the through path has a path loss of about 3 dB. The path has a path loss of about 1 decibel, and the coupled path has a path loss of about 6 decibels; taking a 10 decibel directional coupler as an example, the direct path has a path loss of about 0.5 decibels, and the coupled path also has a path loss of about 10 decibels. Path loss.

In another embodiment of the present invention, a switching device may be additionally added to the communication system 400, as shown in FIG. 13. Similar to the communication system 400, the communication system 1300 also includes an antenna 10 and a wireless communication chip 100. In addition to the control unit 110, for the description of the antenna 10 and the wireless communication chip 100, reference may be made to the related description in FIG. 4 above. However, other components located between the antenna 10 and the wireless communication chip 100 in the communication system 1300 are different from the communication system 400. The switching device 1320, similar to the switching device 20, is used to selectively connect the contact 22 to the contact 24 or 26 according to the control of the control unit 1310. The contact 24 is connected to the port 1 of the connection device 1330. The point 26 is connected to the port 2 of the connecting device 1330 and the point 22 is connected to the port 34 of the connecting device 1330. The switching device 1320 can be implemented by a single-pole double-throw switch. The connecting device 1330 is similar to the connecting device 30, wherein the ports 32 and 34 are connected by a first straight path, the ports 36 and 38 are connected by a second straight path, the ports 32 and 36 are coupled by a first coupling path, and the ports 34 and 38 are coupled by a second coupling path, and the ports 32 and 38 are isolated. The first straight path and the second straight path can be directly or indirectly connected. In addition, the ports 32 and 38 are respectively connected to the contacts 44 and 46 of the switching device 1340, and the port 36 is connected to the port 3. The switching device 1340 is similar to the switching device 1320, which is composed of three contacts 42, 44, 46, and is used to selectively connect the contact 42 to the contacts 44 and 46 according to the control of the control unit 1310. The contact 42 is further connected to the antenna 10. The switching devices 1320 and 1340 and the connecting device 1330 can be integrated into a path selection circuit and configured on a printed circuit board. It should be noted that the first through path and the second through path have an attenuation of about 0.5 decibels, and the first coupling path and the second coupling path have an attenuation of about 10 decibels, or the first through path and the second through path have an attenuation of about 10 decibels. The path has an attenuation of about 1 decibel, and the first coupling path and the second coupling path have an attenuation of about 6 decibels.

The following description can refer to Table 1 and related descriptions at the same time. Because the path selection circuit of the communication system 1300 has been modified, the control unit 1310 is used to perform functions similar to but different from those of the control unit 110. Figures 14A to 14G are flowcharts of the coexistence between the wireless LAN module 120 and the Bluetooth module 130 by the control unit 1310 according to an embodiment of the present invention. At the beginning of the procedure, first obtain the potential operation information of the wireless LAN module 120 and the Bluetooth module 130 in an upcoming time period (step S1401), and then perform a series of checks on the obtained information accordingly. To determine whether one of the wireless LAN module 120 and the Bluetooth module 130 occupies the time zone or both, and to determine whether the transmission/reception operation of one of the above is in the same time zone as the other The transmission/reception job collided. Specifically, it is determined whether only the Bluetooth module 130 occupies the time segment to perform the transmission operation (step S1402). If so, the control unit 1310 sends a control signal to start the Bluetooth transmission in the time segment The front end 153, the balance transformer and switching unit 162 is switched to the Bluetooth transmission front end 153, the switching device 1320 is switched to port 2, and the switching device 1340 is switched to port 32 (case 1) (step S1403), so that the Bluetooth The transmission signal is sequentially transmitted from the Bluetooth module 130 to the antenna 10 via the Bluetooth transmission front end 153, the port 2, and the through path between the ports 34 and 32. In step S1402, if not, it is determined whether only the Bluetooth module 130 occupies the time period to perform the receiving operation (step S1404), if yes, the control unit 1310 sends a control signal to start in the time period Wireless LAN/Bluetooth receiving front-end 152, switching the balance transformer and switching unit 162 to wireless LAN/Bluetooth receiving front-end 152, switching the switching device 1320 to port 2, and switching the switching device 1340 to port 32 (case 2) (Step S1405), so that the Bluetooth receiving signal is sequentially received from the antenna 10 via the direct path between the ports 32 and 34, the port 2, the wireless LAN/Bluetooth reception front end 152, and the splitter 140. Group 130. In step S1404, if not, it is determined whether only the wireless local area network module 120 occupies the time segment to perform the transmission operation (step S1406). If yes, the control unit 1310 sends a control signal to the time segment Activate the wireless LAN transmission front end 151, switch the switching device 1320 to port 1, and And switch the switching device 1340 to port 32 (case 3) (step S1407), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, port 1, and the direct path between ports 34 and 32 from the wireless zone The network module 120 transmits to the antenna 10. In step S1406, if not, it is determined whether only the wireless LAN module 120 occupies the time zone to perform the receiving operation (step S1408). If yes, the control unit 1310 sends a control signal to the time zone Activate the wireless LAN/Bluetooth receiving front end 152, switch the balance transformer and switching unit 162 to the wireless LAN/Bluetooth receiving front end 152, switch the switching device 1320 to port 2, and switch the switching device 1340 to port 32 ( Case 4) (step S1409), so that the wireless LAN reception signal is sequentially received from the antenna 10 via the direct path between ports 32 and 34, port 2, wireless LAN/Bluetooth reception front end 152, and splitter 140 District network module 120.

In step S1408, if not, it means that the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period to perform their respective operations. Because the wireless LAN transmission/reception signal may affect the Bluetooth transmission/reception The signal causes interference and vice versa. Therefore, it is necessary to determine whether the operating status of the wireless LAN transmission/reception signal and the Bluetooth transmission/reception signal are within the range of simultaneous operation (step S1410). The above operation status can be the required power of wireless LAN transmission/reception signal or Bluetooth transmission/reception signal, received signal strength indicator, historical packet error rate, historical bit error rate, signal-to-noise ratio, signal-to-interference ratio . In addition, the above-mentioned operation status may be the number of reconnections of the wireless LAN transmission/reception operation or the Bluetooth transmission/reception operation recorded in the history. In step S1410, if yes, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 each occupy the time period for receiving and transmitting operations (step S1411). If yes, the control unit 1310 sends a control signal to In this time period, the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth transmission front end 155 are activated, and the balanced transformer and switching units 162 and 163 are respectively switched to the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth transmission front end 155. Switch the switching device 1320 to port 2 and switch the switching device 1340 to port 32 or 38 (case 5) (step S1412), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, Port 2, the wireless LAN/Bluetooth reception front end 152, and the splitter 140 receive the wireless LAN module 120 from the antenna 10, and make the Bluetooth transmission signal pass through the Bluetooth transmission front end 155, port 3, and port 36 in turn The through path between 38 is transmitted from the Bluetooth module 130 to the antenna 10. In step S1411, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for receiving operations (step S1413). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth receiving front end 154 are activated, and the balanced transformer and switching units 162 and 163 are respectively switched to the wireless LAN/Bluetooth receiving front end 152 and the Bluetooth receiving front end 154, Switch the switching device 1320 to port 2 and switch the switching device 1340 to port 32 or 38 (case 6) (step S1414), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, port 2 , Wireless LAN/Bluetooth The receiving front end 152 and the splitter 140 receive the wireless LAN module 120 from the antenna 10, and make the Bluetooth reception signal sequentially pass through the through path between the ports 36 and 38, the port 3, and the Bluetooth receiving front end 154 from the antenna 10 Receive the Bluetooth module 130. In step S1413, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 respectively occupy the time period for transmission and reception (step S1415). If yes, the control unit 1310 sends a control signal, In this time period, the wireless LAN transmission front end 151 and the Bluetooth receiving front end 154 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth receiving front end 154, the switching device 1320 is switched to port 1, and the switching device is switched 1340 is switched to port 32 or 38 (case 7) (step S1416), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct connection between ports 32 and 34 The path is transmitted from the wireless LAN module 120 to the antenna 10, and the Bluetooth receiving signal is sequentially received from the antenna 10 to the Bluetooth module via the through path between ports 36 and 38, port 3, and the Bluetooth receiving front end 154 130. In step S1415, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time zone for transmission (step S1417). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to Port 32 or 38 (case 8) (step S1418), so that the wireless LAN transmission signal sequentially goes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct path between ports 32 and 34 from the wireless The LAN module 120 transmits to the antenna 10, and the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 through the Bluetooth transmission front end 155, the port 3, and the through path between the ports 36 and 38 in sequence. The time period is used for transmission and reception operations (step S1415). If yes, the control unit 1310 sends a control signal to activate the wireless LAN transmission front end 151 and the Bluetooth reception front end 154 in the time period, and change the balance The pressing and switching unit 163 switches to the Bluetooth receiving front end 154, switches the switching device 1320 to port 1, and switches the switching device 1340 to port 32 or 38 (case 7) (step S1416), so that the wireless LAN transmission signal is sequentially The direct path between the wireless LAN transmission front end 151, the balanced transformer unit 161, the port 1, and the ports 32 and 34 is transmitted from the wireless LAN module 120 to the antenna 10, and the bluetooth receiving signal passes through the port 36 in turn The through path between and 38, the port 3, and the Bluetooth receiving front end 154 receive the Bluetooth module 130 from the antenna 10. In step S1415, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1417). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to Port 32 or 38 (case 8) (step S1418), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct path between the ports 32 and 34 from the wireless The LAN module 120 transmits to the antenna 10, and the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 via the Bluetooth transmission front end 155, the port 3, and the through path between the ports 36 and 38 in sequence. The time period is used for transmission and reception operations (step S1415). If yes, the control unit 1310 sends a control signal to activate the wireless LAN transmission front end 151 and the Bluetooth reception front end 154 in the time period, and change the balance The pressing and switching unit 163 switches to the Bluetooth receiving front end 154, switches the switching device 1320 to port 1, and switches the switching device 1340 to port 32 or 38 (case 7) (step S1416), so that the wireless LAN transmission signal is sequentially The direct path between the wireless LAN transmission front end 151, the balanced transformer unit 161, the port 1, and the ports 32 and 34 is transmitted from the wireless LAN module 120 to the antenna 10, and the bluetooth receiving signal passes through the port 36 in turn The through path between and 38, the port 3, and the Bluetooth receiving front end 154 receive the Bluetooth module 130 from the antenna 10. In step S1415, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time zone for transmission (step S1417). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to Port 32 or 38 (case 8) (step S1418), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct path between the ports 32 and 34 from the wireless The LAN module 120 transmits to the antenna 10, and the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 through the Bluetooth transmission front end 155, the port 3, and the through path between the ports 36 and 38 in sequence. 3. And the Bluetooth receiving front end 154 receives the Bluetooth module 130 from the antenna 10. In step S1415, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1417). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to Port 32 or 38 (case 8) (step S1418), so that the wireless LAN transmission signal sequentially goes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct path between ports 32 and 34 from the wireless The LAN module 120 transmits to the antenna 10, and the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 via the Bluetooth transmission front end 155, the port 3, and the through path between the ports 36 and 38 in sequence. 3. And the Bluetooth receiving front end 154 receives the Bluetooth module 130 from the antenna 10. In step S1415, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1417). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN transmission front end 151 and the Bluetooth transmission front end 155 are activated, the balance transformer and switching unit 163 is switched to the Bluetooth transmission front end 155, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to Port 32 or 38 (case 8) (step S1418), so that the wireless LAN transmission signal sequentially passes through the wireless LAN transmission front end 151, the balanced transformer unit 161, port 1, and the direct path between the ports 32 and 34 from the wireless The LAN module 120 transmits to the antenna 10, and the Bluetooth transmission signal is transmitted from the Bluetooth module 130 to the antenna 10 through the Bluetooth transmission front end 155, the port 3, and the through path between the ports 36 and 38 in sequence.

In step S1410, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 each occupy the time period for receiving and transmitting operations (step S1419). If yes, the control unit 1310 determines the wireless zone Whether the communication request of the network module 120 and the Bluetooth module 130 collide, and arbitrate which party's communication request should be allowed when the collision occurs (step S1420), if the communication request of the wireless LAN module 120 is allowed Service request, the control unit 1310 sends a control signal to activate the wireless LAN/Bluetooth reception front-end 152, switch the balance transformer and switching unit 162 to the wireless LAN/Bluetooth reception front-end 152, and switch The device 1320 is switched to port 2 and the switching device 1340 is switched to port 32 (case 9) (step S1421), so that the wireless LAN reception signal sequentially passes through the direct path between ports 32 and 34, port 2, and wireless LAN /Bluetooth receiving front end 152 and splitter 140 receive the wireless local area network module 120 from the antenna 10. If the traffic request of the Bluetooth module 130 is allowed, the control unit 1310 sends a control signal to activate the Bluetooth transmission front end 153 and switch the balance transformer and switching unit 163 to the Bluetooth transmission front end in the time period 153. Switch the switching device 1320 to port 2 and switch the switching device 1340 to port 32 (case 9) (step S1422), so that the Bluetooth transmission signal passes through the Bluetooth transmission front end 153, port 2, and port 32 in turn The through path between 34 is transmitted from the Bluetooth module 130 to the antenna 10. In step S1419, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time zone for receiving operations (step S1423). If yes, the control unit 1310 sends a control signal to the In the time zone, the wireless LAN/Bluetooth receiving front end 152 is activated, the balanced transformer and switching unit 162 is switched to the wireless LAN/Bluetooth receiving front end 152, the switching device 1320 is switched to port 2, and the switching device 1340 is switched To port 32 (case 10) (step S1424), so that the combined signal is sequentially received from the antenna 10 to the splitter 140 via the through path between the ports 32 and 34, the port 2, and the wireless LAN/Bluetooth reception front end 152, After that, the splitter 140 separates the wireless LAN receiving signal and the Bluetooth receiving signal from the combined signal, and forwards them to the wireless LAN module 120 and the Bluetooth module 130 respectively. In step S1423, if not, it is determined whether there is no The line area network module 120 and the Bluetooth module 130 respectively occupy the time zone for transmission and reception operations (step S1425). If so, the control unit 110 determines the difference between the wireless area network module 120 and the Bluetooth module 130 Whether the traffic request collides, and arbitrate which party's traffic request should be allowed when the collision occurs (step S1426). If the traffic request of the wireless local area network module 120 is allowed, the control unit 1310 sends a control signal to In this period of time, the wireless LAN transmission front end 151 is activated, the switching device 1320 is switched to port 1, and the switching device 1340 is switched to port 32 (case 11) (step S1427), so that the wireless LAN transmission signal passes through The wireless local area network transmission front end 151, the balanced transformer unit 161, the port 1, and the direct path between the ports 32 and 34 are transmitted from the wireless local area network module 120 to the antenna 10. If the traffic request of the Bluetooth module 130 is allowed, the control unit 1310 is responsible for sending a control signal to activate the wireless LAN/Bluetooth receiving front end 152 and switch the balance transformer and switching unit 162 in this time period. To the wireless LAN/Bluetooth receiving front end 152, switch the switching device 1320 to port 2, and switch the switching device 1340 to port 32 (case 11) (step S1428), so that the Bluetooth signal is received via ports 32 and 34 in turn The through path, the port 2, the wireless LAN/Bluetooth receiving front end 152, and the splitter 140 receive the Bluetooth module 130 from the antenna 10. In step S1425, if not, it is determined whether the wireless LAN module 120 and the Bluetooth module 130 both occupy the time period for transmission (step S1429), if yes, the control unit 1310 determines the wireless LAN module Whether the communication request of 120 and the Bluetooth module 130 collides, and arbitrate which party's communication request should be allowed when the collision occurs (step S1430), if the allowed is the communication request of the wireless LAN module 120, The control unit 1310 sends a control signal to activate the wireless LAN transmission front end 151, switch the switching device 1320 to port 1, and switch the switching device 1340 to port 32 (case 12) (step S1431) in the time period, thereby The wireless local area network transmission signal is sequentially transmitted from the wireless local area network module 120 to the antenna 10 via the wireless local area network transmission front end 151, the balanced transformer unit 161, the port 1, and the direct path between the ports 32 and 34. If the traffic request of the Bluetooth module 130 is allowed, the control unit 1310 sends a control signal to

Without departing from the spirit of the present invention, the structure of FIGS. 4 and 13, and the flowcharts of FIGS. 12A to 12G and 14A to 14G can be modified to obtain processing by the control units 110 and 1310. Other embodiments of the coexistence method of the wireless local area network module 120 and the Bluetooth module 130.

Although the above embodiments illustrate the spirit of the present invention with the coexistence between the wireless LAN module and the Bluetooth module, the present invention can also be applied to other wireless communication modules, such as Global Positioning System (GPS) . Figure 15 is a schematic diagram of a single antenna communication system according to another embodiment of the present invention. The communication system 1500 includes an antenna 10, a diplexer 1510, a global positioning system module 1520, and a subsystem 1530. It may be the communication system 400 or 1300 without the antenna 10. The dual signal device 1510 is composed of three contacts 12, 14, 16 and is used to connect the contact point 12 to the contacts 14 and 16, so that the GPS signal (transmitting signal or receiving signal) is transmitted from the antenna via the dual signal device 1510 10 performs transmission or reception, and at the same time, the wireless signal (transmission signal or reception signal) of the subsystem 1530 is also transmitted or received from the shared antenna 10 via the dual signal device 1520.

The above descriptions are only preferred embodiments of the present invention. Any equivalent changes and modifications made by those familiar with the present application in accordance with the spirit of the present invention should be covered in the scope of the appended patent application.

<p>1, 3, 5. . . Receive job</p><p>2. 4. . . Confirm information</p><p>10. . . antenna</p><p>20, 1320, 1340. . . Switching device</p><p>12, 14, 16, 22, 24, 26, 28, 42, 44, 46, 162-2, 162-4, 162-6, 163-2, 163-4, 163-6. . . contact</p><p>32, 34, 36, 38. . . port</p><p>30, 1330. . . Connecting device</p><p>100. . . Wireless communication chip</p><p>110, 1310. . . control unit</p><p>120. . . Wireless Local Area Network Module</p><p>130. . . Bluetooth module</p><p>140Separator</p><p>151Wireless LAN transmission front end</p><p>152Wireless LAN/Bluetooth Receiving Front End</p><p>153, 155Bluetooth transmission front end</p><p>154Bluetooth receiving front end</p><p>161Balance transformer unit</p><p>162,163Balance transformer and switching unit</p><p>400, 1300, 1500Communication system</p><p>1510Dual Transmitter</p><p>1520Global Positioning System Module</p><p>1530Subsystem</p><p>P1, P2, P3, P4Transmission power</p><p>f1, f1', f2, f2'Near frequency range</p><p>d1, d2frequency gap</p><p>R1, R2area</p><p>L1, L1'represents the straight line of wireless LAN transmission power</p><p>L2, L2'represents the straight line of Bluetooth transmission power</p>

Figure 1 shows a schematic diagram of a mobile phone with dual communication modules.

Figure 2 is a schematic diagram showing the frequency hopping of Bluetooth communication.

Figure 3 is a schematic diagram showing the operational conflict between the wireless LAN and the Bluetooth communication service sharing a single antenna.

FIG. 4 is a schematic diagram of a communication system in which dual wireless communication modules share a single antenna according to an embodiment of the present invention.

5A is a schematic diagram of a switching device realized by a single-pole double-throw switch according to an embodiment of the present invention.

5B is a schematic diagram of a switching device realized by a double-pole double-throw switch according to an embodiment of the present invention.

Fig. 6A is a schematic diagram of a connecting device using an attenuator according to an embodiment of the present invention.

Fig. 6B is a schematic diagram of a connection device using a directional coupler according to an embodiment of the present invention.

Figures 7A and 7B are schematic diagrams of the internal connections of the connection device according to the embodiment of the present invention.

Figures 8A to 8C are flowcharts of a method for reducing signal interference according to an embodiment of the present invention.

9A and 9B are schematic diagrams of power adjustment of wireless LAN transmission signals and Bluetooth transmission signals according to an embodiment of the present invention.

10A and 10B are schematic diagrams of power adjustment of wireless LAN transmission signals and Bluetooth transmission signals according to another embodiment of the present invention.

Figures 11A to 11C are flowcharts of a method for reducing signal interference according to another embodiment of the present invention.

Figures 12A to 12G are flow charts of the control unit 110 processing the coexistence between the wireless LAN module 120 and the Bluetooth module 130 according to an embodiment of the present invention.

FIG. 13 is a schematic diagram of a communication system in which dual wireless communication modules share a single antenna according to another embodiment of the present invention.

Figures 14A to 14G are flowcharts of the coexistence between the wireless LAN module 120 and the Bluetooth module 130 by the control unit 1310 according to an embodiment of the present invention.

Figure 15 is a schematic diagram of a single antenna communication system according to another embodiment of the present invention.