Transmission of a plurality of channels for CDMA telecommunications system
Abstract
A telecommunications system for transmitting a high transmission rate communication in conjunction with a set of medium transmission rate communications using multi-frequency radio frequency signal processing by code division, comprising: first signal processing means for transmitting the set of communications of average transmission rate over a set in phase of channels (90) of average transmission rate in a radio frequency bandwidth; and second signal processing means for transmitting high transmission rate communication over a high transmission rate channel corresponding to a subset of a quadrature phase set of channels (92) of average transmission rate in said width of band d and radiofrequency, said quadrature phase set of channels (92) having an average orthogonal transmission rate to said phase set of channels (90) of medium transmission rate.

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Projected expiry passed 19 December 2017, 8.8 years ago.
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3 claims: 1 independent, 2 dependent
- 1ES 2 290 972 T3 REIVINDICACIONES 1. Un sistema de telecomunicaciones para transmitir una comunicación de alta tasa de transmisión en conjunción con un conjunto de comunicaciones de tasa de transmisión media utilizando procesamiento de señales de radiofrecuencia de acceso múltiple por división de código, que comprende:primeros medios de procesamiento de señales para transmitir el conjunto de comunicaciones de tasa de transmisión media sobre un conjunto en fase de canales (90) de tasa de transmisión media en un ancho de banda de radiofrecuencia;y segundos medios de procesamiento de señales para transmitir la comunicación de alta tasa de transmisión sobre un canal de alta tasa de transmisión que corresponde a un subconjunto de un conjunto de fase en cuadratura de canales (92) de tasa de transmisión media en dicho ancho de banda de radiofrecuencia, siendo dicho conjunto de fase en cuadratura de canales (92) de tasa de transmisión media ortogonal a dicho conjunto en fase de canales (90) de tasa de transmisión media. 2. El sistema de telecomunicaciones según la reivindicación 1, en el que dicho conjunto en fase de canales (90) de tasa de transmisión media está definido por un conjunto de códigos de canal, y dicho conjunto de fase en cuadratura de canales (92) de tasa de transmisión media está definido por el mismo conjunto de códigos de canal, y el canal de alta tasa de transmisión corresponde a un subconjunto distribuido uniformemente de dicho conjunto de códigos de canal. 3. El sistema de telecomunicaciones según la reivindicación 1, en el que: dichos primeros medios de procesamiento de señales están adaptados además para generar dicho conjunto en fase de canales (90) de tasa de transmisión media utilizando un conjunto de códigos (102, 112) de canal largo;y dichos segundos medios de procesamiento de señales están adaptados además para generar dicho canal de alta tasa de transmisión utilizando un código (134) de canal corto que se refiere a dicho subconjunto del conjunto de fase en cuadratura de canales de tasa de transmisión media. 4. El sistema de telecomunicaciones según la reivindicación 3, en el que dicha comunicación de alta tasa de transmisión se compone de un conjunto de símbolos de código de alta tasa de transmisión, y dichos segundos medios de procesamiento de señales están adaptados para modular cada símbolo de código de alta tasa de transmisión con dicho código (134) de canal corto. 5. El sistema de telecomunicaciones según la reivindicación 2, en el que dicho conjunto de códigos (102, 112, 126) de canal son códigos Walsh de sesenta y cuatro símbolos. 6. El sistema de telecomunicaciones según la reivindicación 2, que comprende además: terceros medios de procesamiento de señales para transmitir un segundo conjunto de comunicaciones de tasa de transmisión media utilizando otro subconjunto de dicho conjunto de fase en cuadratura de canales de tasa de transmisión media. 7. El sistema de telecomunicaciones según la reivindicación 3, en el que dichos primeros medios de procesamiento de señales comprenden además: un sumador (120) para generar datos sumados en respuesta a dicho conjunto en fase de canales (90) de tasa de transmisión media. 8. El sistema de telecomunicaciones según la reivindicación 7, que comprende además: primeros medios ensanchadores en fase para generar primeros datos ensanchados en fase en respuesta a dichos datos sumados;primeros medios ensanchadores de fase en cuadratura para generar primeros datos ensanchados de fase en cuadratura en respuesta a dichos datos sumados;segundos medios ensanchadores en fase para generar segundos datos ensanchados en fase en respuesta a dicho canal de alta tasa de transmisión;segundos medios ensanchadores de fase en cuadratura para generar segundos datos ensanchados de fase en cuadratura en respuesta a dicho canal de alta tasa de transmisión;y primeros medios de suma para generar un término (Xi) en fase en respuesta a dichos primeros datos ensanchados en fase y una versión negativa de dichos segundos datos ensanchados de fase en cuadratura;ES 2 290 972 T3 y segundos medios de suma para generar un término (X Q ) de fase en cuadratura en respuesta a dichos primeros datos ensanchados de fase en cuadratura y dichos segundos datos ensanchados en fase. 9. El sistema de telecomunicaciones según la reivindicación 8, que comprende además: un generador de portadora en fase para modular dicho término (X!) en fase;y un generador de portadora de fase en cuadratura para modular dicho término (XQ) de fase en cuadratura. 10. El sistema de telecomunicaciones según la reivindicación 1, en el que dichos primeros medios de procesamiento de señales comprenden: un primer modulador (102, 104) de código de canal largo para generar primeros datos de canal en respuesta a primeros datos de usuario;y dichos segundos medios de procesamiento de señales comprenden un primer modulador (134, 140) de código de canal corto para generar segundos datos de canal en respuesta a los segundos datos de usuario;el sistema de telecomunicación comprende además: un primer ensanchador en fase para generar primeros datos en fase en respuesta a dichos primeros datos de canal;un segundo ensanchador en fase para generar segundos datos en fase en respuesta a dichos segundos datos de canal;un primer ensanchador de fase en cuadratura para generar primeros datos de fase en cuadratura en respuesta a dichos primeros datos de canal;un segundo ensanchador de fase en cuadratura para generar segundos datos de fase en cuadratura en respuesta a dichos segundos datos de canal;primeros medios de suma para generar un término (X¡) en fase en respuesta a dichos primeros datos en fase y una versión inversa de dichos segundos datos de fase en cuadratura;segundos medios de suma para generar un término (X Q ) de fase en cuadratura en respuesta a dichos primeros datos de fase en cuadratura y dichos segundos datos en fase;un generador de portadora en fase para modular una señal en fase en respuesta a dicho término en fase;un generador de portadora de fase en cuadratura para modular una señal de fase en cuadratura en respuesta a dicho término de fase en cuadratura;y terceros medios de suma para sumar dicha señal en fase modulada y dicha señal de fase en cuadratura modulada. 11. El sistema de telecomunicaciones según la reivindicación 10, en el que dichos primeros datos de canal tienen una tasa de transmisión de datos inferior a dichos segundos datos de canal. 12. El sistema de telecomunicaciones según la reivindicación 1, en el que dichos primeros medios de procesamiento de señales comprenden un primer sistema de generación de canales para generar dicho conjunto en fase de canales de tasa de transmisión media;y en el que dichos segundos medios de procesamiento de señales comprenden un segundo sistema de generación de canales para generar dicho canal de alta tasa de transmisión que es ortogonal a dicho conjunto en fase de canales de tasa de transmisión media. 13. El sistema de telecomunicaciones según la reivindicación 12, en el que dicho primer sistema de generación de canales se compone de un conjunto de moduladores de código de canal largo. 14. El sistema de telecomunicaciones según la reivindicación 13, en el que dicho segundo sistema de generación de canales se compone de un modulador de código de canal corto. 15. El sistema de telecomunicaciones según la reivindicación 12, en el que dicho segundo sistema de generación de canales comprende medios para transmitir datos a través de dicho canal de alta tasa de transmisión que corresponde a un subconjunto distribuido uniformemente de un conjunto de códigos de canal largo. 16. Un procedimiento para transmitir una comunicación de alta tasa de transmisión en conjunción con un conjunto de comunicaciones de tasa de transmisión media utilizando procesamiento de acceso múltiple por división de código, que comprende las etapas de: ES 2 290 972 T3 a. generar un conjunto en fase de canales (90) de tasa de transmisión media;b. generar un canal de alta tasa de transmisión a partir de un subconjunto de un conjunto de fase en cuadratura de canales de tasa de transmisión media;c. transmitir dichas comunicaciones de tasa de transmisión media sobre dicho conjunto en fase de canales (90) de tasa de transmisión media y dicho canal de alta tasa de transmisión d. transmitir dicha comunicación de alta tasa de transmisión sobre dicho canal de alta tasa de transmisión. 17. El procedimiento según la reivindicación 16, en el que dicho canal de alta tasa de transmisión se refiere a un subconjunto distribuido uniformemente de canales Walsh. 18. El procedimiento según la reivindicación 16, en el que las etapas a) y c) se componen de las etapas de: generar dicho conjunto en fase de canales de tasa de transmisión media modulando dicho conjunto de comunicaciones de tasa de transmisión media con un conjunto de códigos (102, 112) de canal largo;sumar dicho conjunto en fase de canales de tasa de transmisión media produciendo datos (D I ) sumados;generar datos ensanchados en fase en respuesta a dichos datos sumados y un código de ensanchamiento en fase;generar datos ensanchados de fase en cuadratura en respuesta a dichos datos sumados y un código de ensanchamiento de fase en cuadratura;modular dichos datos ensanchados en fase con una portadora en fase produciendo una señal en fase;modular dichos datos ensanchados de fase en cuadratura con una portadora de fase en cuadratura produciendo una señal de fase en cuadratura;y sumar dicha señal en fase y dicha señal de fase en cuadratura. 19. El procedimiento según la reivindicación 16, en el que las etapas b) y d) se componen de las etapas de: generar dicho canal de alta tasa de transmisión modulando dicha comunicación de alta tasa de transmisión con un código (134) de canal corto produciendo datos de alta tasa de transmisión, en el que dicho código de canal corto se refiere a dicho subconjunto del conjunto de fase en cuadratura de canales de tasa de transmisión media;generar datos ensanchados en fase de alta tasa de transmisión en respuesta a dichos datos de alta tasa de transmisión y un código de ensanchamiento en fase;generar datos ensanchados de fase en cuadratura de alta tasa de transmisión en respuesta a dichos datos de alta tasa de transmisión y un código de ensanchamiento de fase en cuadratura;modular dichos datos ensanchados en fase de alta tasa de transmisión con una portadora de fase en cuadratura produciendo una señal de fase en cuadratura de alta tasa de transmisión;modular una versión inversa de dichos datos ensanchados de fase en cuadratura de alta tasa de transmisión con una portadora de fase en fase produciendo una señal en fase de alta tasa de transmisión;y sumar dicha señal en fase de alta tasa de transmisión y dicha señal de fase en cuadratura de alta tasa de transmisión. 20. El procedimiento según la reivindicación 16, en el que las etapas a) y b) se componen de las etapas de: a.1) modular dicho conjunto de comunicaciones de tasa de transmisión media utilizando un conjunto de códigos de canal largo;a.2) sumar dicho conjunto de comunicaciones moduladas de tasa de transmisión media produciendo datos (DI) sumados;b1) modular dicha comunicación de alta tasa de transmisión con un código de canal corto produciendo dicho canal de alta tasa de transmisión en el que dicho código de canal corto se refiere a un subconjunto de dicho conjunto de códigos de canal largo. ES 2 290 972 T3 21. El procedimiento según la reivindicación 20, en el que dicho código de canal corto se compone de dos símbolos Walsh y dichos códigos de canal largo se componen cada uno de sesenta y cuatro símbolos Walsh. 22. El procedimiento según la reivindicación 16, en el que la etapa de generar un conjunto en fase de canales (90) de tasa de transmisión media comprende utilizar un conjunto de códigos Walsh largos;en el que la etapa de generar un canal de alta tasa de transmisión comprende generar dicho canal de alta tasa de transmisión utilizando un código Walsh corto;23. El procedimiento según la reivindicación 22, que comprende además la etapa de transmitir datos piloto en un canal desde dicho conjunto en fase de canales (90) de tasa de transmisión media. 24. El procedimiento según la reivindicación 22, en el que dicho conjunto en fase de canales (90) de tasa de transmisión media incluye un canal piloto, un canal de sincronización y un canal de tráfico. 25. El procedimiento según la reivindicación 22, en el que dicho código corto ocupa un subconjunto distribuido uniformemente de un conjunto de códigos Walsh largos. 26. El procedimiento según la reivindicación 22, en el que dichos códigos Walsh largos se componen de sesenta y cuatro símbolos Walsh. 27. El procedimiento según la reivindicación 16, que comprende las etapas adicionales de: generar una fuente de datos de complejos que comprende un término (Di) de multicanal que corresponde a dicho conjunto en fase de canales de tasa de transmisión media y un término (D Q ) de alta tasa de transmisión que corresponde a dicho canal de alta tasa de transmisión;generar un código de ensanchamiento de complejos que tiene un término en fase y un término de fase en cuadratura;multiplicar de manera compleja dicha fuente de datos de complejos y dicho código de ensanchamiento de complejos produciendo un término (Xi) real y un término (XQ) imaginario. modular dicho término (Xi) real con una portadora en fase;y modular dicho término (XQ) imaginario con una portadora de fase en cuadratura. 28. El procedimiento según la reivindicación 27, en el que la etapa que genera una fuente de datos de complejos se compone de las etapas de: 1) generar dicho conjunto en fase de canales (90) de tasa de transmisión media en respuesta a un conjunto de comunicaciones (100, 110) de tasa de transmisión media y un conjunto de códigos (102, 112) de canal largo;
- 22) generar dicho término (Di) de multicanal sumando dicho conjunto en fase de canales (90) de tasa de transmisión media;y
- 33) generar dicho canal de alta tasa de transmisión en respuesta a dicha comunicación (132) de alta tasa de transmisión y un código (134) de canal corto que corresponde a un subconjunto de dichos códigos de canal largo produciendo un término de ata tasa de transmisión. 29. El procedimiento según la reivindicación 28, en el que la etapa 1) se compone de la etapa de modular dicho conjunto de comunicaciones (100, 110) de tasa de transmisión media con dicho conjunto de códigos (102, 112) de canal largo. 30. El procedimiento según la reivindicación 28, que comprende además la etapa de ajustar la amplitud de dicho conjunto en fase de canales (90) de tasa de transmisión media y dicho canal de alta tasa de transmisión. 31. El procedimiento según la reivindicación 28, en el que la etapa 3) se compone de la etapa de transmitir dichos datos de alta tasa de transmisión sobre un conjunto de fase en cuadratura de canales (92) de tasa de transmisión media. 32. El procedimiento según la reivindicación 28, en el que dicho término de alta tasa de transmisión comprende además datos de dicho conjunto de fase en cuadratura de canales (92) de tasa de transmisión media que se genera en respuesta a un segundo conjunto de comunicaciones (124) de tasa de transmisión media y un segundo subconjunto de dicho conjunto de códigos (126) de canal largo.
Independent claims3
124 paragraphs in 9 sections, as filed
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DESCRIPTION
High data rate supplemental channels for a CDMA telecommunication system.
Background of the invention
I. Field of the invention
The present invention relates to wireless telecommunications. More particularly, the present invention relates to a novel and improved method for implementing a high rate air interface.
II. Description of Related Art
The IS-95 standard of the Telecommunications Industry Association (TIA) and its derivatives such as IS-95A and ANSI J-STD-008 (jointly referred to in this document as IS-95), define an air interface suitable for implementing a digital cellular phone system with efficient bandwidth. For this purpose, the IS-95 standard provides a procedure for establishing multiple radio frequency (RF) traffic channels, each having a data transmission rate of up to 14.4 kilobits per second. Traffic channels can be used for voice telephony or for digital data communications including small file transfers, email, and fax.
Although a transmission rate of 14.4 kilobits per second is adequate for those types of lower data rate applications, the increasing popularity of higher data applications, such as the Internet and video conferencing, has caused a demand higher data rates. To meet this new demand, the present invention is directed to provide an air interface that supports higher transmission rates.
Figure 1 illustrates a highly simplified cellular telephone system configured in a manner compatible with the use of the IS-95 standard. In operation, telephone calls and other communications are made by exchanging data between subscriber units 10 and base stations 12 using RF signals. Communications are further effected from base stations 12 through base station controllers (BSC) and a mobile switching center (MSC) 16, to either a public switched telephone network (PSTN) 18 or to another unit 10 of subscriber. The BSCs 14 and MSC 16 typically provide mobility control, call processing, and call routing functionality.
In an IS-95 compliant system, RF signals exchanged between subscriber units 10 and base stations 12 are processed according to code division multiple access (CDMA) signal processing techniques. The use of CDMA signal processing techniques allows adjacent base stations 12 to use the same RF bandwidth which, when combined with the use of transmit power control, renders an IS-95 system wide more effective band than other cell phone systems.
CDMA processing is considered a "spread spectrum" technology because the CDMA signal spreads over a wider amount of RF bandwidth than is generally used for non-spread spectrum systems. The spreading bandwidth for an IS-95 system is 1.2288 MHz. A CDMA-based digital wireless telecommunications system configured substantially in accordance with the use of the IS-95 standard is described in US Patent 5,103,450 entitled "SYSTEM AND METHOD FOR GENERATING SIGNAL WAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM", assigned to the assignee of the present invention.
The demand for higher transmission rates is anticipated to be greater for the forward link than the reverse link as a typical user is expected to receive more data than it generates. The forward link signal is the RF signal transmitted from a base station 12 to one or more subscriber units 10. The reverse link signal is the RF signal transmitted from a subscriber unit 10 to a base station 12.
Figure 2 illustrates the signal processing associated with the forward link traffic channel IS-95, which is a part of the forward link signal IS-95. The forward link traffic channel is used for the transmission of user data from a base station 12 to a particular subscriber unit 10. During normal operation, the base station 12 generates multiple channels of forward link traffic, each being used for communication with a particular subscriber unit 10. Additionally, base station 12 generates various control channels including a pilot channel, a sync channel, and a paging channel. The forward link signal is the sum of the traffic channels and the control channels.
As shown in Figure 2, user data is entered at node 30 and processed in blocks of 20 milliseconds (ms) called frames. The amount of data in each frame can be one of four values with each lowest value about half of the next highest value. In addition, two possible sets of frame sizes can be used, which are called rate set one and rate set two.
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For rate set two, the amount of data contained in the longest frame, or "full rate" corresponds to a rate of 13.35 kilobits per second. For rate set one, the amount of data contained in the full rate frame corresponds to a rate of 8.6 kilobits per second. Smaller size frames are called half rate, quarter rate, and one-eighth rate frames. The various data frames are used to adjust for changes in voice activity that are experienced during normal conversation.
The CRC generator 36 adds CRC data with the amount of CRC data generated depending on the frame size and the rate set. The tail byte generator 40 adds eight known logical state tail bits to each frame to aid in the decoding process. For full rate frames, the number of tail bits and CRC bits brings the rate up to 9.6 and 14.4 kilobits per second for rate set one and rate set two.
The data from the tail byte generator 40 is convolutionally encoded by the encoder 42 to generate code symbols 44. Coding is carried out at ½ of the transmission rate with limiting length 9 (K).
The selective remover 48 removes 2 out of 6 code symbols for the frames in rate set two, effectively reducing the encoding performed to 2/3 of the rate. Thus, at the output of selective eliminator 48, code symbols are generated at 19.2 kilosymbols per second (Ksps) for both rate set one and rate set two frames.
The block interleaving device 50 performs the interleaving of blocks in each frame and the interleaved code symbols are modulated with a Walsh channel code from the Walsh code generator 54 that generates sixty-four Walsh symbols for each code symbol. A Walsh channel code W, is selected from a set of sixty-four Walsh channel codes and is typically used for the duration of an interface between a particular subscriber unit 10 and a base station 12.
Then the Walsh symbols are duplicated and a copy is modulated with a code (PN<sub>I</sub>) of spreading PN in phase of spreading code generator 52, and the other copy is modulated with a code (PN<sub>Q</sub>) of the quadrature phase PN spreading of the spreading code generator 53. The in-phase data is then low-pass filtered by LPF 58 and modulated with a sinusoidal in-phase carrier signal. Similarly, quadrature phase data is low pass filtered by LPF 60 and modulated with a quadrature phase sinusoidal carrier. The two modulated carrier signals are then added together to form the signal s (t) and transmitted as the forward link signal.
Additional attention is directed to WO 95/03652 which discloses a method and system for assigning a set of variable length orthogonal PN code sequences between user channels operating at different data rates in a communication system of spread spectrum. PN code sequences are created that provide orthogonality between users so that mutual interference will be reduced, thereby allowing for higher capacity and better link performance. In an exemplary embodiment, signals are communicated between a cell site and mobile units using direct sequence spread spectrum communication signals. The information signals communicated on the cell-to-mobile link channels are encoded, interleaved and modulated with orthogonal coverage of each information symbol. The orthogonal Walsh function codes of variable length are used to modulate the information signals. The code assignments are made according to the data rates of the channels in a way that results in improved utilization of the available frequency spectrum. A substantially similar modulation scheme can be employed in the mobile-to-cell link.
According to the present invention there are provided a telecommunications system, as set forth in claim 1, and a method for transmitting a high rate communication, as set forth in claim 16. Preferred embodiments of the invention are claimed in dependent claims.
Summary of the invention
The present invention is a novel and improved method for implementing a high rate air interface. A transmission system provides an in-phase channel set and a quadrature phase channel set. The in-phase channel set is used to provide a complete set of orthogonal average rate control and traffic channel. The quadrature phase channel set is used to provide a supplemental high rate channel and an extended set of medium rate channels that are orthogonal to each other and to the original medium rate channels. The high rate supplemental channel is generated over a set of medium rate channels using a short channel code. Medium rate channels are generated using a set of long channel codes.
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Brief description of the drawings
The characteristics, objectives and advantages of the present invention will be more apparent from the detailed description set forth below when taken in conjunction with the drawings in which the same reference characters are correspondingly identified in all of them and in which:
Figure 1 is a block diagram of a cellular telephone system;
Figure 2 is a block diagram of forward link signal processing associated with the IS-95 standard;
Figure 3 is a block diagram of a transmission system configured in accordance with an embodiment of the invention;
Figure 4 is a list of the 64 symbol Walsh code set and associated indices used in a preferred embodiment of the invention;
Figure 5 is a block diagram of channel coding performed according to an embodiment of the invention; Figure 6 is a block diagram of a reception system configured in accordance with an embodiment of the invention;
<sup>Y</sup> Figure 7 is a block diagram of a decoding system configured in accordance with an embodiment of the invention.
Detailed description of the preferred embodiments
Figure 3 is a block diagram of a transmission system configured in a manner compatible with the use of the invention. Typically, the transmission system will be used to generate the forward link signal in a cellular telephone system and will therefore be incorporated into a base station 12. In the exemplary configuration shown, the transmission system generates a forward link signal that includes a full set of IS-95, or medium rate, channels, as well as a high speed supplemental channel. Additionally, in the described embodiment, an extended set of IS-95 channels is provided. Alternative embodiments of the invention could provide more than one high speed supplemental channel or could not provide the use of an additional set of IS-95 channels or both. Furthermore, while it is preferred to provide IS-95 channels, other embodiments of the invention could incorporate other types of channels and processing protocols.
In the proposed exemplary embodiment, the transmission system provides a set 90 of in-phase channels and a set 92 of quadrature phase channels. The in-phase channel set 90 is used to provide the full set of orthogonal IS-95 traffic and control channels. Orthogonal channels do not interfere with each other when transmitted through the same path. The quadrature phase channel set 92 is used to provide a high rate supplemental channel and an extended set of IS-95 channels that are orthogonal to each other and to the original IS-95 channels. In the preferred embodiment of the invention, all signals and data shown in Figure 3 are made up of positive and negative integer values represented by binary digital data or voltages, corresponding to a logic low level and a logic high level, respectively.
For the in-phase channel set 90, the IS-95 control channel system 100 performs various functions associated with one of the standard IS-95 control channels, including encoding and interleaving, the processing of which is described in the IS-95 standard. . In this case, since the Walsh channel code is used<sub>1</sub>, the processing will be carried out according to the use of a paging channel. The resulting code symbols from the IS-95 control channel system 100 are modulated with a Walsh code from the Walsh generator 102<sub>1</sub> via a multiplier 104. The Walsh generators 102 are used to generate orthogonal in-phase channels.
The Walsh generator 102 repeatedly generates a Walsh code of index 1 (Walshi) from a set of Walsh codes of indexes 0 to 63 (Walsh<sub>0-63</sub>). Figure 4 is a list of 64 symbol Walsh codes and associated indices used in a preferred embodiment of the invention. A Walsh code element (chip) corresponds to a Walsh symbol and a Walsh code element value of 0 corresponds to a positive integer (+) while a Walsh code element value of 1 corresponds to a negative integer (-) . Under the IS-95 standard, the Walshi code corresponds to the paging channel. Walsh symbols generated by modulation with the Walsh1 code are adjusted in gain by channel gain 108 (2).
The pilot channel is generated by a gain setting of a positive 1 value using channel gain 108 (1). No coding is performed for the pilot channel according to the IS-95 standard, since the Walsh0 code used for the pilot channel are all positive 1 values, and therefore not equivalent to any modulation.
Additional control channels are similarly generated using IS-95 control channel systems, additional Walsh generators, and additional channel gains (all not shown). Such control channels include a sync channel, which is modulated with the Walsh code.<sub>32</sub>. The processing associated with each type of IS-95 control channel is described in the IS-95 standard.
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The processing associated with one of the IS-95 traffic channels in the in-phase channel set is illustrated with the IS-95 traffic channel system 110, which performs various functions associated with an IS-95 traffic channel including convolutional coding. and interlaced, as described above to generate a sequence of symbols at 19.2 kilosymbols per second. The code symbols of the IS-95 traffic channel system 110 are modulated with the Walsh code<sub>63</sub> 64-symbol 112 Walsh generator<sub>63</sub> by multiplier 114 to generate a sequence of symbols at 1.2288 mega symbols per second. The Walsh symbols in multiplier 114 are adjusted in gain by gain setting 108 (64).
The outputs of all gain settings, including gain settings 108 (1) - (64), are summed by adder 120 generating data Di in phase. Each gain setting 108 increases or decreases the gain of the particular channel with which it is associated. Gain adjustment can be made in response to a variety of factors, including power control commands from the subscriber unit 10 processing the associated channel or to differences in the type of data being transmitted on the channel. By keeping the transmission power of each channel to the minimum necessary for proper communication, interference is reduced and total transmission capacity is increased. In one embodiment of the invention, the gain settings 108 are configured by a control system (not shown) that could take the form of a microprocessor.
In the quadrature phase channel set 92 an extended set of 64 minus 2 is provided, using the IS-95 channel systems 124<sup>N</sup> IS-95 traffic channels. N is an integer value based on the number of Walsh channels assigned to the supplemental channel and is described in more detail below. Each coding symbol of systems 124 (2) - (64 - 2<sup>N</sup>) of channels IS-95 is modulated with a Walsh code of generators 126 Walsh by multipliers 128, except for system 124 (1) of traffic channels IS-95, which is located on the Walsh channel<sub>0</sub>, and therefore does not require modulation.
To provide the high rate supplemental channel, a supplemental channel system 132 encodes symbols at a rate R<sub>S</sub> transmission, which is 2<sup>N</sup> times that of a full rate IS-95 traffic channel. Each code symbol is modulated with a supplemental Walsh code (Walsh<sub>s</sub>) of supplemental Walsh code generator 134 using multiplier 140. The output of multiplier 140 is adjusted in gain by gain setting 130. The outputs of the gain setting set 130 are added by the adder 150 producing data D<sub>Q</sub> from phase to quadrature. It should be understood that the extended set of IS-95 traffic channel could be completely or partially replaced with one or more additional supplementary channels.
The processing performed by the supplemental channel system 132 is described in more detail below. The Walsh Code<sub>S</sub> generated by the supplemental Walsh code generator 134 depends on the number of Walsh codes assigned to the high rate supplemental channel in the quadrature phase channel set 92. In the preferred embodiment of the invention, the number of Walsh channels allocated for the high rate supplemental channel can be any value 2<sup>N</sup> where N = {2, 3, 4, 5, 6}. WalshS codes are 64/2 long<sup>N</sup> symbols, instead of the 64 symbols used with Walsh IS-95 codes. In order for the high-rate supplemental channel to be orthogonal to the other quadrature phase channels with 64-symbol Walsh codes, 2<sup>N</sup> of the 64 possible quadrature phase channels with 64 symbol Walsh codes for the other quadrature phase channels. Table I provides a list of possible Walsh codes for each value of N and the corresponding sets of assigned 64-symbol Walsh codes.
(Table goes to next page)
ES 2 290 972 T3
TABLE I
<td>N</td><td>Walsh,</td><td>64-symbol assigned Walsh codes</td>
<td> 2</td><td></td><td> 0. 16. 32.48</td>
<td></td><td></td><td> 1. 17.33.49</td>
<td></td><td></td><td> 2. 18. 34. 50</td>
<td></td><td></td><td> 3. 19. 35.51</td>
<td></td><td></td><td> 4. 20. 36. 52</td>
<td></td><td> + + ,+ ,-.+ .-.-.+ .-.1-</td><td> 5. 21.37.53</td>
<td></td><td> + , + ,-.-.-,-, + , + , + . + .-.-.-,-. + .-</td><td> 6. 22. 38.54</td>
<td></td><td></td><td> 7. 23. 39. 55</td>
<td></td><td></td><td> 8. 24.40, 56</td>
<td></td><td></td><td> 9.25,41 57</td>
<td></td><td></td><td> 10.26,42,58</td>
<td></td><td></td><td> 11,27.43.59</td>
<td></td><td></td><td> 12.28,44.60</td>
<td></td><td></td><td> 13.29.45,61</td>
<td></td><td></td><td> 14,30.46,62</td>
<td></td><td></td><td> 15.31.47,63</td>
<td> 3</td><td></td><td> 0. 8. 16. 24. 32. 40. 48. 56</td>
<td></td><td></td><td> 1.9. 17. 25, 33,41.49. 57</td>
<td></td><td></td><td> 2. 10. 13. 26. 34. 42, 50. 58</td>
<td></td><td></td><td> 3. 11. 19. 27. 35. 43. 51.59</td>
<td></td><td></td><td> 4.12. 20, 28, 36.44. 52, 60</td>
<td></td><td></td><td> 5.13. 21.29, 37,45. 53. 61</td>
<td></td><td></td><td> 3. 14. 22, 30. 38, 46. 54, 62</td>
<td></td><td></td><td> 7. 15. 23. 31. 39. 47. 55. 63</td>
<td> 4</td><td> +.+.+.+</td><td> 0,4. 8.....60</td>
<td></td><td></td><td> 1.5. 9.....61</td>
<td></td><td></td><td> 2. 6,10.....62</td>
<td></td><td></td><td> 3. 7.11.....63</td>
<td> 5</td><td> +.+</td><td> 0. 2.4.....62</td>
<td></td><td> + .-</td><td> 1. 3, 5.....63</td>
<td> 6</td><td> +</td><td> 0.1.2.....63</td>
The + and - signs indicate a positive or negative integer value, where the preferred integer is 1. As is evident, the number of Walsh symbols in each Walsh code<sub>S</sub> varies as N varies and in all cases is less than the number of symbols in the Walsh IS-95 channel codes. Therefore, the supplemental channel is formed using a short Walsh channel code and the IS-95 channels are formed using longer Walsh channel codes. Regardless of the length of the WalshS code, in the described embodiment of the invention the symbols are applied at a transmission rate of 1.2288 Megachips per second (Mcps). Therefore, the Walsh codes<sub>S</sub> shorter in length are repeated more often.
Channels Di and D<sub>Q</sub> data are multiplied in a more complex way, such as the first real term and the first imaginary term respectively, with PN codes<sub>I</sub> and PN<sub>Q</sub> of spreading, as the second real term and the second imaginary term respectively, yielding an in-phase (or real) Xi term and a quadrature (or imaginary) phase XQ term. PNi and PNQ spreading codes are generated by generators 152 and 154
ES 2 290 972 T3 of spreading code. PN codes<sub>I</sub> and PN<sub>Q</sub> spread are applied to 1.2288 Mcps. Equation (1) illustrates the complex multiplication performed.
(Xi + JXq) = (Di + JDq) (PNi + JPNq) (1)
Then the X term<sub>i</sub> in-phase is low-pass filtered in a 1.2288 MHz bandwidth (not shown) and upconverted by multiplication with the COS carrier (w<sub>C</sub>t) in phase. Similarly, the quadrature phase XQ term is low-pass filtered in a 1.2288 MHz bandwidth (not shown) and upconverted by multiplication with the SEN carrier (w<sub>C</sub>t) from phase to quadrature. The X terms<sub>i</sub> and X<sub>Q </sub>Upconverted add up to produce the forward link signal s (t).
Complex multiplication allows the quadrature phase channel set 92 to remain orthogonal to the in-phase channel set 90 and therefore provide, without adding additional interference, to the other channels transmitted on the same path with perfect recovery. of the receiver phase. Thus, a complete set of sixty-four Walsh channels is orthogonally added to the original IS-95 channel set and this set of channels can be used for the supplemental channel. Additionally, by implementing the supplemental channel in the orthogonal quadrature phase channel set 92, a subscriber unit 10 configured to process the normal IS-95 forward link signal will still be able to process the IS-95 channels within the channel set 90 in phase, thus providing the high rate channel while maintaining backward compatibility with previously existing systems.
Although the embodiment of the invention shown in Figure 3 uses a single set of in-phase and quadrature phase carriers to generate the set of in-phase and quadrature phase channels, independent sets of sinusoids could be used to independently generate the in-phase and quadrature-phase channel sets, with the second set of carriers out of phase from the first set by 90 °. For example, data D<sub>Q </sub>could be applied to the second set of carrier sinusoids in which the spread data (PNI) in phase D<sub>Q </sub>apply to COS (w<sub>C</sub>t - 90 °) and the spread data (PNQ) of phase in quadrature D<sub>Q</sub> apply to SEN (w<sub>C</sub>t - 90 °). The resulting signals are then summed to produce quadrature phase channel set 92, which in turn are summed into in-phase channel set 90.
Using the Walsh channels<sub>S</sub> as set forth in Table I it also allows a simplified implementation of the supplemental channel within the quadrature phase channel set 92. In particular, the use of the WalshS codes listed in Table I allows the supplementary channel to use all subsets of the 64-symbol Walshj codes without the need to generate each and every one of those Walsh codes.
For example, when N = 5, the Walsh codes<sub>S</sub> specified by Table I assign a set of 32 64-symbol Walshj codes to the supplementary channel. That is, all 64-symbol Walsh codes of even index or all 64-symbol Walsh codes of odd index are assigned to the supplementary channel. This leaves the odd index or even index channels, respectively, to implement the extended IS-95 traffic channel set. In Figure 3, the supplemental channel uses the odd-numbered 64-symbol Walsh code channels when Walsh<sub>S</sub> = {+, -} and even channels are available for the extended IS-95 traffic channel set.
In another example, when N = 4, the Walsh codes<sub>S</sub> associates assign a set of sixteen Walsh codes<sub>j</sub> of 64 symbols. This leaves a set of forty-eight Walshj codes remaining to implement the extended IS-95 traffic channels or to implement the additional supplemental channels. In general, the use of the Walsh code<sub>S</sub> which corresponds to a particular N value, assign 2<sup>N</sup> Walsh codes<sub>j</sub> 64 symbols to the supplemental channel using a single, shorter, Walsh code<sub>S</sub>.
Assigning all subsets of Walsh codes<sub>j</sub> using a single Walsh code<sub>S</sub> it is facilitated by the uniform distribution of the 64-symbol Walshj codes within the subset. For example, when N = 5, the Walshj codes are separated by 2, and when N = 4 the Walshj codes are separated by 4. Only by providing a complete set of quadrature phase channels 92 to implement the supplemental channel can the allocation of a large set of evenly spaced Walsh channels be made and thus implemented using a single WalshS code.
Furthermore, by assigning a 64 symbol Walshj code subset using a single shorter WalshS code, the complexity associated with providing a high rate supplemental channel is reduced. For example, performing actual modulation using the 64 symbol Walshj code set and summing the resulting modulated data would require a substantial increase in signal processing resources when compared to using the single WalshS generator used in the implementation of the invention described herein.
Evenly spaced Walshj channel sets could not be assigned so easily if the supplemental channel were placed on the previously existing IS-95 forward link in-phase channel set 90 or on the QPSK modulated quadrature phase or in-phase channels . This is because certain Walsh channels<sub>j</sub> Sixty-four symbols are already assigned to control functions such as paging, pilot, and paging channels.
ES 2 290 972 T3 synchronization on the in-phase channel. Therefore, using a new quadrature phase Walsh code space allows for simplified implementation of the supplementary channel.
Furthermore, the use of the unique Walsh code<sub>S</sub> It improves the performance of the high rate supplemental channel by minimizing the variance in the amplitude of the supplemental channel. In the embodiment described herein, the amplitude is simply based on the positive or negative integer associated with the WalshS code. This differs from modulating with a set of 2<sup>N</sup> 64 symbol Walsh codes, which would result in the set of amplitudes 0, +2, -2, +4, -4, ..., 2<sup>N</sup> and -2<sup>N</sup>.
Among other improvements, reducing the amplitude variance reduces the ratio of peak power to average power, increasing the range in which the forward link signal can be received for a given maximum transmit power from the base station 12. or other direct link transmission system.
Figure 5 is a block diagram of the supplemental channel system 132 of Figure 1 when configured in accordance with one embodiment of the invention. The user data is received by the CRC checksum generator 200 which adds checksum information to the received data. In the preferred embodiment of the invention, the data is processed in 20 ms frames as is done for the IS-95 standard and 16 bits of checksum data are added. The tail bits 202 add eight tail bits to each frame. The output of the tail bits 202 is received at a data transmission rate D by the convolutional encoder 204 which performs convolutional coding at a rate R<sub>C</sub> transmission in each frame. The rate R<sub>C</sub> it is different for different embodiments of the invention as described in greater detail below.
The block interleaver device 206 interleaves the code symbols from the convolutional encoder 204 and the repeater 208 repeats the sequence of code symbols from the interleaver device 206 by a repetition amount M. The repetition amount M varies in different embodiments of the invention and will normally depend on the rate R<sub>c</sub> encoding and rate R<sub>s</sub> supplementary channel transmission (see Figure 3). The amount of repetition is discussed in more detail below. Mapper 210 receives the code symbols from repeater 208 and converts logical zeros and logical ones to negative and positive integers which are transmitted at the transmission rate Rs of the supplementary channel.
Table II provides a list of data entry rates D, encoding rates Rc, repetition amounts M, and rates R<sub>s</sub> of supplementary channel transmission that can be used in different embodiments of the invention. In some embodiments, multiple rates are used.
TABLE II
<td>Convolutional encoder input rate (D) in kbps</td><td>(N)</td><td>Walsh channels for supplemental channel (2<sup>n</sup>)</td><td>Rate (R<sub>c</sub>) of convoluclonal code</td><td>Amount (M) of repetition</td><td>Walsh Symbols / Code Symbols (W / S)</td><td>Convolutional encoder input bits</td><td>Number of channel bits per frame</td>
<td> 38,4</td><td> 2</td><td> 4</td><td> _1/2</td><td> 1</td><td> 16/1</td><td> 768</td><td> 1.536</td>
<td> 38,4</td><td> 3</td><td> 8</td><td> _1/4</td><td> 1</td><td> 8/1</td><td> 768</td><td> 3.072</td>
<td> 38,4</td><td> 4</td><td> 16</td><td> _1/4</td><td> 2</td><td> 4/1</td><td> 768</td><td> 6.144</td>
<td> 38,4</td><td> 5</td><td> 32</td><td> _1/4</td><td> 4</td><td> 2/1</td><td> 768</td><td> 12.288</td>
<td> 38,4</td><td> 6</td><td> 64</td><td> _1/4</td><td> 8</td><td> 1/1</td><td> 768</td><td> 24.576</td>
<td> 76,8</td><td> 3</td><td> 8</td><td> _1/2</td><td> 1</td><td> 8/1</td><td> 1.536</td><td> 3.072</td>
<td> 76,8</td><td> 4</td><td> 16</td><td> _1/4</td><td> 1</td><td> 4/1</td><td> 1.536</td><td> 6.144</td>
<td> 76,8</td><td> 5</td><td> 32</td><td> _1/4</td><td> 2</td><td> 2/1</td><td> 1.536</td><td> 12.288</td>
<td> 76,8</td><td> 6</td><td> 64</td><td> _1/4</td><td> 4</td><td> 1/1</td><td> 1.536</td><td> 24.576</td>
<td> 153,6</td><td> 4</td><td> 16</td><td> _1/2</td><td> 1</td><td> 4/1</td><td> 3.072</td><td> 6.144</td>
<td> 153,6</td><td> 5</td><td> 32</td><td> 1/4</td><td> 1</td><td> 2/1</td><td> 3.072</td><td> 12.288</td>
<td> 153,6</td><td> 6</td><td> 64</td><td> _1/4</td><td> 2</td><td> 1/1</td><td> 3.072</td><td> 24.576</td>
Three encoder input D rates are shown for the supplemental channel: 38.4, 76.8, and 153.6 kilobits per second. For each of these encoder input rates D, a set of encoder rates Rc and repetition quantities M are provided that achieve the desired encoder input rate D. Additionally, the ratio of WalshS symbols to code symbols is provided, which corresponds to the length of the Walsh code.<sub>S</sub>. Also, the number of encoder input bits is provided for every 20 frames, since it is the number
ES 2 290 972 T3 of code symbols transmitted per 20 ms frame. The actual data rate will be equal to the encoder input rate D minus the overhead required for the CRC bits and tail bits and any other control information provided. The use of Reed-Soloman encoding in addition to, or instead of, CRC checksum encoding is also contemplated.
In general, it is desirable to use the highest possible value of N for the supplemental channel in order to spread the supplemental channel over the largest number of Walsh channels. Spreading the supplemental channel over a larger set of Walsh channels minimizes the effect of inter-channel interference between the two Walsh channels, corresponding to the set 90 of in-phase channels and the set 92 of quadrature phase channels. This inter-channel interference is caused by imperfect phase alignment experienced during receive processing. Spreading the supplemental channel over a larger set of Walsh channels, minimizes the amount of inter-channel interference that is experienced for any particular Walsh channel in the in-phase channel set 90, since the portion of the supplemental channel on that Walshi channel is small. In addition, spreading the supplemental channel over a larger set of Walshi channels with a higher total channel symbol rate allows for higher symbol diversity, which improves performance under fading channel conditions.
When the number of Walsh channels required for the desired encoder input rate D using rate * / 2 encoding is less than the number of available Walsh channels by at least a factor of two, performance is improved by broadening the signal over more Walsh channels. The highest channel symbol rate for the largest number of Walsh channels is obtained using a ¼ rate code, rather than a ½ rate code, or by repetition of sequences, or both. The ¼ rate code provides additional coding gain over that of a ½ transmission code under benign or fading channel conditions, and sequence repetition provides improved performance under fading channel conditions due to increased diversity.
In a preferred embodiment of the invention, a supplemental channel is provided having an encoder input rate of 76.8 kilobits per second using N = 5, a rate R<sub>c</sub> encoder number of * 4 and a repetition amount of M = 2. Such an implementation provides data transfer rates on the order of an ISDN channel that includes sufficient bandwidth for signaling. Additionally, using N = 5 maintains an additional 32 Walshi channels to provide extended IS-95 channels.
The actual sustainable transmission rate of the supplementary channel will vary depending on a variety of environmental conditions including the amount of multipath experienced by forward link transmission. The overhead rate depends on the amount of multipath because the forward link signals arriving via different paths are no longer orthogonal and therefore interfere with each other. This interference increases with increased transmission rates due to the additional transmission power required. Therefore, the more multipath interference is experienced, the lower the sustainable transmission rate of the supplementary channel. Therefore, a lower transmission rate is preferred for the supplemental channel for high multipath environments.
In one embodiment of the invention, a control system is contemplated that measures various environmental factors and selects the optimal processing characteristics of the supplemental channel. In addition, the use of signal cancellation to eliminate noise due to multipath transmissions is contemplated. A method and apparatus for performing such noise cancellation is described in co-pending patent application No. 08 / 518,217 entitled "METHOD AND SYSTEM FOR PROCESSING A PLURALITY OF MULTIPLE ACCESS TRANSMISSIONS" assigned to the assignee of the present invention.
Figure 6 is a block diagram of a receive processing system for processing the high rate supplementary channel according to an embodiment of the invention. Typically, the receive processing system will be implemented in a subscriber unit 10 of a cellular telephone system.
In operation, RF signals received by antenna system 300 are down-converted with carrier 302 in phase and carrier 304 in quadrature phase generating R samples.<sub>I</sub> digitized in-phase reception and R samples<sub>Q</sub> quadrature phase reception. These reception samples are provided to the finger processor module shown and to other finger processors (not shown) in accordance with the use of a scanning receiver. Each fingerprint processor processes one instance of the supplemental forward link signal received with each instance generated by multipath phenomena.
The samples Ri and R<sub>Q</sub> In-phase and quadrature phase receive rates are multiplied by the complex conjugate of the PN spreading codes generated by the phase-spreading code generator 306 and the quadrature-phase-spreading code generator 308, yielding the terms Yi and YQ of reception. The Y terms<sub>I</sub> and Y<sub>Q</sub> reception are modulated with the Walsh code<sub>S</sub> generated by Walsh generator 310, and adders 312 sum the resulting modulated data on the number of Walsh symbols in the Walsh code<sub>S</sub>. Additionally, pilot filters 316 add and filter the Y terms<sub>I</sub> and Y<sub>Q</sub> reception (calculate their average).
The outputs of the adders 312 are then multiplied with the complex conjugate of the filter pilot data and the resulting quadrature phase term is used in the supplemental channel scheduled decision data 320. The supplemental scheduled decision data 320 may then be combined with scheduled decision data from other finger processors (not shown) and the decoded combined scheduled decision data.
ES 2 290 972 T3
FIG. 7 is a block diagram of a decoder system used to decode the supplementary programmed decision data 320 in accordance with one embodiment of the invention. The scheduled decision data is received by an accumulator 400 that accumulates samples of the scheduled decision data by the repetition amount M. The accumulated data is then deinterlaced by deinterlacing device 402 and decoded by framing decoder 404. Various types of decoders are widely known including Viterbi decoders.
The firm decision user data from the framing decoder 404 is then checked against the CRC checksum data by the CRC check system 406 and the resulting user data is transmitted along with the check results indicating whether the user data they were compatible with the checksum data. The receiving or user processing system can then determine whether to use the user data based on the CRC checksum results.
Therefore, a particularly suitable high data transmission transmission system for use in conjunction with the forward link IS-95 has been described. The invention can be incorporated into both terrestrial and satellite-based wireless communication systems, as well as wired communication systems over which sinusoidal signals are transmitted such as coaxial cable systems. Furthermore, although the invention is described in the context of a signal with a 1.2288 MHz bandwidth, the use of other bandwidths is compatible with the operation of the invention, including 2.5 and 5 MHz systems, 0 MHz.
Similarly, although the invention has been described using transmission rates on the order of 10 kbps and 70 kbps, the use of other channel transmission rates may be employed. In a preferred embodiment of the invention, the various systems described herein are implemented using semiconductor integrated circuits coupled through conductive, inductive, and capacitive connections, the use of which is widely known in the art.
The above description is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without the use of inventiveness. Therefore, the present invention is not intended to be limited to the embodiments shown herein but is subject to the broadest scope consistent with the principles and novel features disclosed herein.
Contents9
8 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8
62 members in 22 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 19970784281 | United States of America | – | |
| 78428197 | United States of America | A | |
| 78428197 | United States of America | A | |
| 97953368784281 | – | – | – |
| US19970784281 | – | – | – |
Members62
| Document | Office | Kind | |
|---|---|---|---|
| ZA9879B | South Africa | B | |
| CA2277071A1 | Canada | A1 | |
| WO9832263A2 | World Intellectual Property Organization (WIPO) | A2 | |
| AU5712898A | Australia | A | |
| WO9832263A3 | World Intellectual Property Organization (WIPO) | A3 | |
| US5949814A | United States of America | A | |
| TR1999001657T2 | Türkiye | T2 | |
| TR199901657T2 | Türkiye | T2 | |
| EP0956672A2 | European Patent Office (EPO) | A2 | |
| CN1244983A | China | A | |
| EA199900654A1 | Eurasian Patent Organization (EAPO) | A1 | |
| PL334633A1 | Poland | A1 | |
| TW387179B | Taiwan Province of China | B | |
| BR9714288A | Brazil | A | |
| IL130747A0 | Israel | A0 | |
| IL130747D0 | Israel | D0 | |
| HK1023667A1 | Hong Kong, China | A1 | |
| KR20000070197A | Republic of Korea | A | |
| US6173007B1 | United States of America | B1 | |
| ID27486A | Indonesia | A | |
| JP2001508626A | Japan | A | |
| EA001746B1 | Eurasian Patent Organization (EAPO) | B1 | |
| US6298051B1 | United States of America | B1 | |
| US2002009063A1 | United States of America | A1 | |
| US6501787B1 | United States of America | B1 | |
| US6574210B2 | United States of America | B2 | |
| US2003108088A1 | United States of America | A1 | |
| IL130747A | Israel | A | |
| CN1135762C | China | C | |
| IL156736A0 | Israel | A0 | |
| IL156736D0 | Israel | D0 | |
| US6842477B2 | United States of America | B2 | |
| KR100567180B1 | Republic of Korea | B1 | |
| EP1802004A2 | European Patent Office (EPO) | A2 | |
| EP0956672B1 | European Patent Office (EPO) | B1 | |
| AT368974T | Austria | T | |
| ATE368974T1 | Austria | T1 | |
| DE69737974D1 | Germany | D1 | |
| EP1802004A3 | European Patent Office (EPO) | A3 | |
| ES2290972T3This record | Spain | T3 | |
| DE69737974T2 | Germany | T2 | |
| HK1108980A1 | Hong Kong, China | A1 | |
| EP2106033A2 | European Patent Office (EPO) | A2 | |
| HK1135245A | Hong Kong, China | A | |
| HK1135245A1 | Hong Kong, China | A1 | |
| JP4541453B2 | Japan | B2 | |
| JP2010200343A | Japan | A | |
| EP2288062A1 | European Patent Office (EPO) | A1 | |
| HK1154716A | Hong Kong, China | A | |
| HK1154716A1 | Hong Kong, China | A1 | |
| EP2106033A3 | European Patent Office (EPO) | A3 | |
| EP1802004B1 | European Patent Office (EPO) | B1 | |
| ES2391654T3 | Spain | T3 | |
| JP5144707B2 | Japan | B2 | |
| EP2106033B1 | European Patent Office (EPO) | B1 | |
| EP2288062B1 | European Patent Office (EPO) | B1 | |
| PT2106033E | Portugal | E | |
| PT2288062E | Portugal | E | |
| DK2288062T3 | Denmark | T3 | |
| DK2106033T3 | Denmark | T3 | |
| ES2431796T3 | Spain | T3 | |
| ES2433592T3 | Spain | T3 |
Numbers
- Publication
- 2290972
- Publication, DOCDB
- 2290972
- Publication, EPODOC
- ES2290972T
- Application
- 97953368
- Application, DOCDB
- 97953368
- Application, EPODOC
- ES19970953368T
Titles2
- Spanish
- CANALES SUPLEMENTARIOS DE ALTA TASA DE TRANSMISION DE DATOS PARA UN SISTEMA DE TELECOMUNICACION CDMA.
- English
- SUPPLEMENTARY CHANNELS OF HIGH RATE OF DATA TRANSMISSION FOR A CDMA TELECOMMUNICATION SYSTEM.
Classification
- CPC, 10
- H04B1/707
- H04L12/00
- H04B7/264
- H04J13/0003
- H04J13/0048
- H04L1/0041
- H04L1/0059
- H04L1/0067
- H04L1/08
- H04L2001/0093
- IPC, 6
- H04J11 00
- H04B1 707
- H04B7 26
- H04L
- H04L1 00
- H04L5 12