Interference detection, identification, extraction and reporting
39 claims: 22 independent, 17 dependent
- 1狭帯域チャネルを含むとともに保護帯域周波数を有する保護帯域が隣接する周波数帯域幅を有する広帯域通信信号において、狭帯域干渉を検出かつ除去する方法であって、前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく、前記狭帯域チャネルの少なくとも一部を走査し、前記狭帯域チャネルの少なくとも一部における前記信号強度に基づきしきい値を決定し、保護帯域信号強度を決定すべく、前記保護帯域周波数を走査し、 前記保護帯域信号強度が前記しきい値を超える場合、保護帯域周波数をフィルタすることを有することを特徴とする方法。
- 2前記保護帯域信号強度を、補償因子によって補償するステップをさらに有することを特徴とする請求項1に記載の方法。
- 3前記保護帯域信号強度の補償をすることは、前記保護帯域信号強度が広帯域受信機のフィルタにより減衰する量だけ前記保護帯域信号強度を減少させることを含むことを特徴とする請求項2に記載の方法。
- 4前記補償因子は受信機フィルタの周波数応答に基づいていることを特徴とする請求項2に記載の方法。
- 5前記保護帯域周波数のフィルタリングは、前記補償因子によって補償される前記保護帯域信号強度が前記しきい値を超える場合、前記保護帯域周波数のフィルタリングを含むことを特徴とする請求項4に記載の方法。
- 6前記しきい値を決定することは、狭帯域チャネルの少なくとも一部における前記信号強度の少なくとも一部の平均を決定することを含むことを特徴とする請求項1に記載の方法。
- 7前記しきい値を決定することは、前記狭帯域チャネルの少なくとも一部における前記信号強度の少なくとも一部の平均を決定する場合に、最も大きい信号強度の数を含めないことを含むことを特徴とする請求項6に記載の方法。
- 8前記しきい値を決定することは、前記狭帯域チャネルの少なくとも一部における前記信号強度の少なくとも一部の前記平均に、オフセットを加えることを含むことを特徴とする請求項7に記載の方法。
- 9狭帯域チャネルを含むとともに保護帯域周波数を有する保護帯域が隣接する周波数帯域幅を有する広帯域通信信号において、狭帯域干渉を検出かつ除去するように構成されているシステムであって、前記狭帯域チャネルの少なくとも一部おける信号強度を決定すべく、前記狭帯域チャネルの少なくとも一部を走査するように構成されているスキャナーと、フィルタされた広帯域通信信号を生成すべく、前記広帯域通信信号を受信するとともに、該広帯域通信信号から狭帯域干渉を選択的に取り除くように構成されているノッチモジュールと、前記スキャナーおよび前記ノッチモジュールに結合される制御装置とを備えており、前記制御装置は、前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく前記狭帯域チャネルの少なくとも一部を走査する前記スキャナーを制御し、前記狭帯域チャネルの少なくとも一部における前記信号強度に基づきしきい値を決定し、保護帯域信号強度を決定すべく前記保護帯域周波数を走査するスキャナーを制御し、前記保護帯域信号強度が前記しきい値を超える場合、保護帯域周波数を選択的にフィルタすべく前記ノッチモジュールを制御するように構成されていることを特徴とするシステム。
- 10前記制御装置は補償因子により前記保護帯域信号強度を補償するように構成されていることを特徴とする請求項9に記載のシステム。
- 11前記制御装置は、前記保護帯域信号強度が広帯域受信機のフィルタによって減衰する量だけ前記保護帯域信号強度を減少することにより、前記保護帯域信号を補償するように構成されていることを特徴とする請求項10に記載のシステム。
- 12前記補償因子は受信フィルタの周波数応答に基づいていることを特徴とする請求項10に記載のシステム。
- 13前記制御装置は、前記補償因子により補償された前記保護帯域信号強度が前記しきい値を超える場合に、前記保護帯域周波数をフィルタするように構成されていることを特徴とする請求項12に記載のシステム。
- 14前記制御装置は、前記狭帯域チャネルの少なくとも一部における前記信号強度の少なくとも一部の平均を決定することにより、前記しきい値を決定するように構成されていることを特徴とする請求項9に記載のシステム。
- 15前記ノッチモジュールが第一のノッチモジュールであり、前記フィルタされた広帯域通信信号が第一のフィルタされた広帯域通信信号であって、第二のフィルタされた広帯域通信信号を生成すべく、前記第一のフィルタされた広帯域通信信号を前記第一のノッチモジュールから受信し、前記しきい値を超える信号強度を有する狭帯域チャネルに一致する周波数で、前記第一のフィルタされた広帯域通信信号を選択的にフィルタするように構成されている第二のノッチモジュールをさらに備えていることを特徴とする請求項9に記載のシステム。
- 16狭帯域チャネル含む周波数帯域幅を有する広帯域通信信号において狭帯域干渉を検出かつ除去する方法であって、 前記狭帯域チャネルが干渉を有する確率を表す順番で前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく、前記狭帯域チャネルの少なくとも一部を走査し、前記狭帯域チャネルの少なくとも一部における前記信号強度に基づきしきい値を決定し、前記しきい値を超える信号強度を有する狭帯域チャネルを識別し、 複数のフィルタを前記広帯域通信信号に選択的に適用し、各フィルタは前記しきい値を超える信号強度を有する識別された狭帯域チャネルに一致する周波数で、前記広帯域通信信号に適用されることを有し 、前記狭帯域チャネルが干渉を有する前記確率は履歴干渉パターンに基づいている ことを特徴とする方法。
- 17狭帯域チャネル含む周波数帯域幅を有する広帯域通信信号において狭帯域干渉を検出かつ除去するように構成されているシステムであって、前記狭帯域チャネルが干渉を有する確率を表す順番で、前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく前記狭帯域チャネルの少なくとも一部を走査するように構成されているスキャナーと、内部に配置された複数のノッチフィルタを有し、前記広帯域通信信号を受信するとともに、フィルタされた広帯域通信信号を生成すべく前記広帯域通信信号から狭帯域干渉を除去するために前記複数のノッチフィルタを選択的に適用するように構成されているノッチモジュールと、前記スキャナーおよび前記ノッチモジュールに結合された制御装置とを備えており、前記制御装置は、前記狭帯域チャネルの少なくとも一部における前記信号強度に基づきしきい値を決定すべく前記スキャナーと連結して作動し、前記しきい値を超える信号強度を有する狭帯域チャネルを識別し、前記しきい値を超える信号強度を有する識別された前記狭帯域チャネルに一致する周波数で前記広帯域通信信号をフィルタするようにノッチモジュールを制御するように構成されて おり、前記狭帯域チャネルが干渉を有する前記確率は、履歴干渉パターンに基づいている、又は前記システムにより観察されたデータに基づいている ことを特徴とするシステム。
- 18狭帯域チャネル含む周波数帯域幅を有する広帯域通信信号において狭帯域干渉を検出かつ除去する方法であって、 前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく、前記狭帯域チャネルの少なくとも一部を走査し、 前記狭帯域チャネルの少なくとも一部における前記信号強度に基づいてしきい値を決定し、 前記しきい値を超える信号強度を有する狭帯域チャネルのリストを格納し、 前記しきい値を超える信号強度を有する狭帯域チャネルの前記リストに基づいて干渉源の種類を識別し、複数のフィルタを前記広帯域通信信号に選択的に適用し、各フィルタは前記しきい値を超える信号強度を有する識別された狭帯域チャネルに一致する周波数で、前記広帯域通信信号に適用され、前記フィルタリングが識別された干渉源の前記種類に基づいていることを特徴とする方法。
- 19前記広帯域通信信号をフィルタリングするためのフィルタを前記干渉源の帯域幅に基づいて選択することを特徴とする 請求項18 に記載の方法。
- 20狭帯域干渉源をフィルタするのに狭帯域フィルタが利用されること特徴とする 請求項19 に記載の方法。
- 21前記広帯域通信信号をフィルタリングするのに利用される前記フィルタの帯域幅が、略前記干渉源の帯域幅であることを特徴とする 請求項19 に記載の方法。
- 22狭帯域チャネル含む周波数帯域幅を有する広帯域通信信号において狭帯域干渉を検出かつ除去するように構成されているシステムであって、前記狭帯域チャネルが干渉を有する確率を表す順番で、前記狭帯域チャネルの少なくとも一部における信号強度を決定すべく、前記狭帯域チャネルの少なくとも一部を走査するように構成されているスキャナーと、内部に配置された複数のノッチフィルタを有し、前記広帯域通信信号を受信するとともに、フィルタされた広帯域通信信号を生成すべく前記広帯域通信信号から狭帯域干渉を除去するために前記複数のノッチフィルタを選択的に適用するように構成されているノッチモジュールと、前記スキャナーおよび前記ノッチモジュールに結合されている制御装置とを備えており、前記制御装置は、前記しきい値を超える信号強度を有する狭帯域チャネルのリストを格納し、前記しきい値を超える信号強度を有する狭帯域チャネルの前記リストに基づいて干渉源の種類を識別し、前記しきい値を超える信号強度を有する識別された狭帯域チャネルに一致する周波数で前記広帯域通信信号をフィルタすべく前記ノッチモジュールを制御するように構成され、前記ノッチモジュールによって利用されるフィルタは識別された干渉源の前記種類に基づいて おり、前記狭帯域チャネルが干渉を有する確率は、履歴干渉パターンに基づいている、又は前記システムにより観察されたデータに基づいて いることを特徴とするシステム。
- 23前記制御装置は、前記干渉源の前記帯域幅に基づいて前記広帯域通信信号をフィルタリングするためのフィルタを選択するように構成されていることを特徴とする 請求項22 に記載のシステム。
- 24前記ノッチモジュールは、狭帯域干渉源をフィルタすべく狭帯域フィルタを利用することを特徴とする 請求項23 に記載のシステム。
- 25前記ノッチモジュールにより利用される前記フィルタの帯域幅は、略前記干渉源の前記帯域幅であることを特徴とする 請求項23 に記載のシステム。
- 26前記しきい値を超える信号強度を有する狭帯域チャネルのリストをネットワーク管理者に出力することを更に有する ことを特徴とする 請求項16 に記載の方法。
- 27前記リストは、前記狭帯域チャネルの信号強度に従って優先順位付けされることを特徴とする 請求項26 に記載の方法。
- 28前記出力することは、前記ネットワーク管理者が狭帯域チャネルの少なくとも一部についての情報を受信し得るとともに、前記狭帯域信号強度が前記しきい値を超える原因である干渉物の識別を決定し得るように実行されることを特徴とする 請求項26 に記載の方法。
- 29前記ネットワーク管理者は、前記狭帯域干渉に含まれる干渉物の前記識別の電子指標を受信することにより、該干渉物の該識別を決定することを特徴とする 請求項28 に記載の方法。
- 30前記電子指標は、モバイルユニットの電子通し番号であることを特徴とする 請求項28 に記載の方法。
- 31前記ネットワーク管理者は、一旦、前記干渉物が識別された場合、該干渉物を無力にすることを特徴とする 請求項30 に記載の方法。
- 32前記出力することは、前記ネットワーク管理者が前記狭帯域チャネルの少なくとも一部の前記情報を受信し得るとともに、狭帯域チャネルが前記しきい値を超える原因となる干渉物が緊急サービスを呼び出そうと試みていたか否かを判定し得るように実行されることを特徴とする 請求項26 に記載の方法。
- 33前記ネットワーク管理者は、前記干渉物が緊急サービスを呼び出そうと試みていたか否かをモバイルユニットにより発信される一連のダイアルの数字を傍受することにより判定し得ることを特徴とする 請求項32 に記載の方法。
- 34干渉のより高い確率を有する前記狭帯域チャネルは、第1番目に走査されることを特徴とする請求項16に記載の方法。
- 35干渉のより高い確率を有する前記狭帯域チャネルは、第1番目に走査されることを特徴とする請求項17に記載のシステム。
- 36干渉のより高い確率を有する前記狭帯域チャネルは、第1番目に走査されることを特徴とする請求項18に記載の方法。
- 37干渉のより高い確率を有する前記狭帯域チャネルは、第1番目に走査されることを特徴とする請求項22に記載のシステム。
- 38前記干渉源はモバイルユニットであることを特徴とする請求項22に記載のシステム。
- 39前記干渉物と通信する通信施設に連絡することと、前記通信施設に前記干渉物の前記伝送周波数を変更する又は前記干渉物との通信を一斉に止めるように要求することとを更に含むことを特徴とする請求項28に記載の方法。
Independent claims39
1 paragraph, as filed
(Technical field) The present invention is directed to a communication system, and more specifically, to a technique for detecting, identifying, extracting, and eliminating narrowband interference in a broadband communication system. [0001] (Background technology) This application claims the benefits of US Provisional Application No. 60 / 195,387 filed on April 7, 2000. [0002] As shown in FIG. 1, the exemplary telephone communication system 10 includes mobile units 12, 13, a large number of base stations, two base stations with reference numbers 14 and 16 shown in FIG. 1, and base stations 14, 16 It may be equipped with an exchange 18 which can be connected to each of the above. Base stations 14 and 16 and exchange 18 can be collectively related as a network communication facility. [0003] During operation, mobile units 12 and 13 exchange voice data or other information with one of each base station 14 or 16 connected to a traditional terrestrial telephone network and connect to the traditional terrestrial telephone network, respectively. Will be done. For example, information such as voice information transferred from the mobile unit 12 to one of the base stations 14 and 16 is connected from the base station to the telephone network, and the mobile unit 12 is connected to the terrestrial telephone, thereby terrestrial. The line telephone can receive voice information. Conversely, information such as voice information can be transferred from the ground line telephone to one of the base stations 14 and 16, and then that information is transferred to the mobile unit 12. [0004] Mobile units 12 and 13 and base stations 14 and 16 can exchange information in either analog or digital format. For the purposes of this description, it is assumed that the mobile unit 12 is a narrowband analog device and that the mobile unit 13 is a wideband digital device. Further, it is assumed that the base station 14 is a narrowband analog base station that communicates with the mobile unit 12, and the base station 16 is a broadband digital base station that communicates with the mobile unit 13. [0005] Analog format communication is carried out using a narrowband 30 kHz (KHz) channel. The state-of-the-art mobile telephone system (AMPS) is an example of an analog communication system in which the mobile unit 12 communicates with a base station 14 that utilizes a narrowband channel. Alternatively, the mobile unit 13 communicates with a base station 16 that utilizes a form of digital communication such as, for example, code division multiple access (CDMA) or time division multiple access (TDMA). Digital communication is carried out using spread spectrum techniques that spread the signal so that it has a wide bandwidth, such as a 1.25 MHz (MHz) bandwidth. [0006] The exchange 18 typically performs the overall function of base stations 14, 16 to ensure that mobile units 12, 13 constantly communicate with base stations 14, 16 or other geographically dispersed base stations. Responsible for coordination. For example, exchange 18 causes mobile unit 12 to cease communication between base station 14 and another analog base station as mobile unit 12 moves between geographic areas covered by two base stations. Can be adjusted. [0007] One unique problem that can occur in the telephone communication system 10 is that the mobile unit 12 or the base station 14, which communicates using a narrow band channel, respectively, receives and processes a wideband digital signal from the digital mobile unit 13. This is a case of interfering with the activity of the existing base station 16. In such a situation, the narrowband signal transmitted from the mobile unit 12 or the base station 14 may interfere with the activity of properly receiving the wideband communication signal of the base station 16. [0008] (Disclosure of Invention) According to one embodiment, the present invention can be embodied in a method of detecting and eliminating narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is arranged. The protection band having the protection band frequency is adjacent to this frequency bandwidth. Such a method scans at least a portion of a narrowband channel to measure signal strength in at least a portion of the narrowband channel, and a threshold based on the signal strength of at least a portion of the narrowband channel. May have to determine. Further, the method may include scanning the protected band frequency to measure the protected band signal strength and filtering the protected band frequency if the protected band signal strength exceeds the threshold. [0009] According to the second embodiment, the present invention is embodied in a system configured to detect and eliminate narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is located. A protected band having a protected band frequency is adjacent to this frequency bandwidth. Such a system is configured to receive a wideband communication signal with a scanner configured to scan at least a portion of the narrowband channel to measure the signal strength of at least a portion of the narrowband channel. It may also include a notch module configured to selectively remove narrowband interference from the wideband communication signal in order to generate a filtered wideband communication signal. The system also includes a controller connected to a scanner and notch module, which scans at least a portion of the narrowband channel to measure the signal strength of at least a portion of the narrowband channel. It is configured to control the scanner. The controller may also determine the threshold based on the signal strength of at least a portion of the narrowband channel and control the scanner to scan the protected band frequency to measure the protected band signal strength. In addition, the controller may control the notch module to selectively filter the protected band frequency if the protected band signal strength exceeds the threshold. [0012] According to the fifth aspect, the present invention can be embodied in a method of detecting and eliminating narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is arranged. Such a method involves scanning at least a portion of a narrowband channel to measure the signal strength of at least a portion of the narrowband channel in an order that represents the probability that the narrowband channel will have interference. It may have to determine the threshold based on the signal strength of at least a portion of the channel. In addition, this method selectively applies a plurality of filters to the wideband communication signal, with each filter having a frequency that matches the identified narrowband channel having a signal strength above the threshold. Has to be applied to the signal and<u style="single">The probability that the narrowband channel has interference is based on the historical interference pattern.</u>.. [0013] According to a sixth embodiment, the present invention is embodied in a system configured to detect and eliminate narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is located. obtain. The system is configured to scan at least a portion of the narrowband channel to measure the signal strength of at least a portion of the narrowband channel in an order that represents the probability that the narrowband channel will have interference. The plurality of notches are arranged internally to receive the wideband communication signal and to remove narrowband interference from the wideband communication signal in order to generate a filtered wideband communication signal. It may include a notch module that is configured to selectively apply the filter. The system may also include a controller connected to a scanner and notch module, where the controller determines a threshold based on the signal strength of at least a portion of the narrowband channel. Then, it identifies a narrowband channel having a signal strength exceeding the threshold value, and works with a scanner to filter a wideband communication signal at a frequency corresponding to the identified narrowband channel having a signal strength exceeding the threshold value. Is configured to work with<u style="single">The probability that the narrowband channel has interference is based on historical interference patterns or data observed by the system.</u>[0014] According to the seventh aspect, the present invention can be embodied in a method of detecting and eliminating narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is arranged. Such a method is based on scanning at least a portion of the narrowband channel to measure the signal strength of at least a portion of the narrowband channel and the signal strength of at least a portion of the narrowband channel. It may have to determine the value and to store a list of narrowband channels with signal strength above the threshold. This method also identifies the type of interferer based on a list of narrowband channels with signal strengths above the threshold.<u style="single">Multiple filters are selectively applied to the wideband communication signal, and each filter</u>It can have to filter the wideband communication signal at a frequency corresponding to the identified narrowband channel with a signal strength above the threshold, where filtering is based on the type of interferer identified. There is. [0015]<u style="single">Seventh</u>According to the embodiment of the present invention, the present invention can be embodied in a system configured to detect and eliminate narrowband interference in a wideband communication signal having a frequency bandwidth in which a narrowband channel is arranged. Such a system is configured to scan at least a portion of the narrowband channel in order to measure the signal strength of at least a portion of the narrowband channel in an order that represents the probability that the narrowband channel will have interference. The plurality of notches having a scanner and a plurality of notch filters arranged inside, in order to receive the wideband communication signal and to remove narrowband interference from the wideband communication signal in order to generate a filtered wideband communication signal. It may include a notch module that is configured to selectively apply the notch filter of. In addition, such a system may include a controller connected to a scanner and notch module, where the controller is a list of narrowband channels with signal strength above the threshold. The type of interference source is identified based on a list of narrowband channels with signal strength above the threshold, and the frequency corresponding to the identified narrowband channel with signal strength above the threshold. Is configured to control the notch module to filter wideband communication signals, where the filter used by the notch module is based on the type of interferer identified.<u style="single">Furthermore, the probability that the narrowband channel will have interference is based on historical interference patterns or data observed by the system.</u>There is. [0016]<u style="single">Eighth</u>According to the embodiment of the present invention<u style="single">In the fifth form</u>Output a list of narrowband channels with signal strengths above the above threshold to the network administrator.<u style="single">Furthermore</u>Can have. [0017] (Best mode for carrying out the invention) Systems and / or methods for detecting, identifying, extracting, and reporting interference may be available in communication systems, as disclosed in detail below. Specifically, such a system or method may be used in a wideband communication system to prevent or report its presence in narrowband interference that adversely affects the performance of the wideband communication system. [0018] As shown in FIG. 2, the signal reception path of base station 16 described to receive narrowband interference from mobile unit 12 in connection with FIG. 1 provides the signal to the low noise amplifier (LNA) 22. It is equipped with an antenna 20 to be used. The output of this LNA 22 is coupled to the splitter 24, splitting the signal from the LNA into several different paths, one of which may be coupled to the Adaptive Notch Filter (ANF) module 26 and the other. One may be coupled to the narrowband receiver 28. [0019] The output of the ANF module 26 is coupled to the wideband receiver 30, which receiver can be embodied in, for example, a CDMA receiver or any other suitable wideband receiver. The narrowband receiver 28 may be embodied in a 15KHz frequency bandwidth receiver or any other suitable narrowband receiver. Although only one path is shown in FIG. 2, such a signal path is only an example, and in reality, a base station may have two or more such signal paths, and the base station may have two or more such signal paths. Those skilled in the art will readily understand that they may be used to process the main signal and various signals received by station 16. [0020] The outputs of the narrowband receiver 28 and the wideband receiver 30 are coupled to other systems within base station 16. Such a system may perform voice processing and / or data processing, call processing, or any other desired function. In addition, the ANF module 26 is communicably coupled to reporting and control equipment remote from base station 16 via the Internet, telephone lines, or any other suitable medium. Depending on the network, this reporting and control equipment may be integrated into the exchange 18. The narrowband receiver 28 is communicably coupled to the exchange 18 and can respond to commands issued by the exchange 18. [0021] [0021] Components 20-30 of base station 16 shown in FIG. 2 can be found in conventional broadband cell-type base stations, except for the ANF module 26, the details of which are well known to those of skill in the art. Is. Also, FIG. 2 does not disclose all of the base station 16 systems or subsystems, but rather focuses on the base station 16 systems or subsystems related to the description of the present invention. Those skilled in the art will understand. Specifically, although not shown in Figure 2, it is easy to see that base station 16 has a transmission system or subsystem. [0022] While the base station 16 is in operation, the antenna 20 receives wideband signals sent from the mobile unit 13 to multiple receivers, couples such signals to the LNA22, and the LNA22 amplifies the received signals. The amplified signal is coupled to the splitter 24. The splitter 24 splits the amplified signal from the LNA 22 and essentially puts a copy of the amplified signal on its respective output line. The ANF module 26 receives this signal from the splitter 24, filters the wideband signal if necessary to remove any unwanted narrowband interference, and couples this filtered wideband signal to the wideband receiver 30. [0023] FIG. 3 represents a frequency spectrum 40 of a broadband signal that can be received by antenna 20, amplified and split by LNA 22 and splitter 24, and coupled to ANF module 26. If the wideband signal received by antenna 20 has the frequency spectrum 40 shown in FIG. 3, the ANF module 26 does not filter this wideband signal and goes directly through the ANF module 26 to this wideband receiver 30. It just combines the signals. [0024] However, as described above, it is possible for the wideband signal transmitted by the mobile unit 13 and received by the antenna 20 to have the frequency spectrum 42 shown in FIG. Such a frequency spectrum 42 includes not only the wideband signal from the mobile unit 13 having the same frequency spectrum as the frequency spectrum 40 of FIG. 3, but also the three narrowband interferences 44, 46, 48 shown in FIG. , One of these may be from mobile unit 12. Broadband signals with a frequency spectrum 42 including narrowband interferences 44, 46, 48 are received by antenna 20, amplified, split and provided to the ANF module 26, which filters the frequency spectrum 42. Generate the filtered frequency spectrum 50 shown in Figure 5. [0025] The filtered frequency spectrum 50 is stripped of narrowband interference 44, 46, 48, thus leaving a frequency spectrum 50 that is very similar to the frequency spectrum 40 without interference. The filtered wideband signal is then coupled from the ANF module 26 to the wideband receiver 30, so that the filtered wideband signal spectrum 50 can be demodulated. Some of the wideband signal is removed during filtering by the ANF module 26, but enough wideband signal to allow the wideband receiver 30 to reproduce the information sent by the mobile unit to multiple recipients. Remains. Thus, broadly speaking, the ANF module 26 selectively filters wideband signals and removes narrowband interference from them. More details on the ANF module 26 and its operation are provided below in connection with FIGS. 6-17. [0026] In general, as shown in FIG. 6, one embodiment of the ANF module 60 scans the frequency spectrum of the signal provided by the splitter 24 for narrowband interference in it. Such scanning can be achieved by scanning a variety of known narrowband channels that are within the frequency bandwidth of the broadband signal. For example, the ANF module 60 may scan a variety of AMPS channels located within the frequency bandwidth of a broadband signal. Alternatively, the entire frequency spectrum contained by the wideband signal may be scanned. In either case, if narrowband interference is detected in the wideband signal, the ANF module 60 moves the narrowband interference to the notch of the notch filter, thereby filtering the wideband signal to eliminate the narrowband interference. [0027] Specifically, as shown in FIG. 6, the signal from the splitter 24 is coupled to the first mixer 62, which receives additional input from the voltage controlled oscillator (VCO) 64. The first mixer 62 mixes the signal from splitter 26 with the signal from VCO64, thereby transforming the frequency spectrum of the signal from splitter 24 and part of the converted frequency spectrum at intermediate frequency (IF). Place it on the notch frequency of the notch filter 66. Therefore, the component of the frequency-converted signal in the IF is removed by the notch filter 66 whose notch frequency is set in the IF. [0028] The resulting filtered signal is coupled from the notch filter 66 to a second mixer 68, which is also driven by the VCO64. The second mixer 68 mixes the notch filter output with the signal from the VCO 64 and transforms the frequency spectrum of the filtered signal back to the original position the signal from the splitter 24 had. The output of the second mixer 68 is coupled to a band filter 70, which removes any unwanted image frequencies generated by the second mixer 68. [0029] In the system of FIG. 6, the narrowband interference present in the wideband signal is mixed into the IF by the first mixer 62, which is the notch frequency of the notch filter 66 and is therefore removed by the notch filter 66. After this narrowband interference is removed by the notch filter 66, the second mixer 68 restores the signal to its original frequency position, but the narrowband interference remains removed. Collectively, the first mixer 62, VCO64, notch filter 66, second mixer 68, and band filter can be referred to as "up, down filter" or "down, up filter". [0030] Also, if the signal from the splitter 24 is coupled to the bypass switch 72 and as a result no narrowband interference is detected in the wideband signal from the splitter 24, the bypass switch 72 bypasses the notch filter 66 and the mixers 62, 68. It is made operational so that the signal from the splitter 24 is passed directly to the wideband receiver 30. Alternatively, if narrowband interference is detected, the bypass switch 72 is opened to allow the signal from the splitter 24 to pass through the notch filter 66. [0031] Multiple components are provided to detect the presence of narrowband interference and perform frequency scanning. The discriminator 74 receives an output signal from the first mixer 62 and detects the signal strength at the IF using a received signal strength indicator (RSSI) adjusted for the IF. The RSSI output of the discriminator 74 is coupled to a comparator 76, which also receives the threshold voltage on line 78. If the RSSI signal from the discriminator 74 exceeds the threshold voltage on the line 78, the comparator 76 suggests that narrowband interference is present at the IF, which is the notch frequency of the notch filter 66. If narrow band interference is detected, the VCO64 sweep operation is stopped so that the notch filter 66 can eliminate the interference at the IF. [0032] In affecting the sweep operation of the VCO64, the output of the comparator 76 is coupled to the sample and hold circuit 80, which receives the input from the voltage sweep oscillator 82. In general, if no interference is detected by the comparator 76, the output of the voltage sweep oscillator 82 passes through the sample and hold circuit 80 and is applied to the summer 84, which also receives the input from the low frequency filter 86. The low frequency filter is coupled to the output of the discriminator 74. Summer 84, generates a signal to operate VCO64 in a closed loop format. Since the voltage sweep oscillator 82 sweeps its output voltage over time, it also sweeps the output of the summer 84, which allows the frequency output of the VCO 64 to be swept over time. The sweep output of the VCO64, in conjunction with the discriminator 74 and the comparator 76, scans the signal from the splitter 24 for interference. The switch 72 remains closed as long as the comparator 76 indicates that there is no narrowband interference. This is because there is no need to filter the signal from the splitter 24. [0033] However, if the comparator 76 detects narrowband interference in the signal from the splitter 24 (ie, if the RSSI exceeds the voltage of line 78), the sample and hold circuit 80 samples the output of the voltage sweep oscillator 82. It holds the sampled voltage level, thereby providing a fixed voltage to the summoner 84, which in turn provides a fixed output voltage to the VCO64. Since a fixed voltage is provided to the VCO64, the frequency output by the VCO64 does not change and the signal from the splitter 24 is no longer scanned but frequency converted so that the narrowband interference moves to the IF. IF is the notch frequency of the notch filter 66. In addition, if the comparator 76 indicates that narrowband interference is present, the switch 72 is opened. The only path through which the signal from the splitter 24 can pass is through the mixers 62, 68 and the notch filter 66. [0034] The threshold voltage of line 78 may be adjusted manually or generated by filtering some received signal strength. In any case, the comparator 76 does not show the presence of interference when only a wideband signal such as the signal shown in FIG. 3 is present, but only when there is a signal with narrowband interference. , The voltage on line 78 needs to be set. For example, the frequency spectrum 42 shown in FIG. 4 shows three narrowband interferences 44, 46, 48, but only one of these interferences causes the comparator 76 to indicate the presence of narrowband interferences. is necessary. As will be readily appreciated, the embodiment shown in FIG. 6 can only select and filter a single narrowband interference within a wideband signal. [0035] As shown in FIG. 7, a second embodiment of the ANF module 100 can filter multiple narrowband interferences, scanner 102, analog-to-digital converter (A / D) 104, microcontroller 106, It is equipped with an operation, alarm and measurement (OA & M) processor 108, and a notch module. Two notch modules are shown in FIG. 7 with reference numerals 110 and 112. The microcontroller 106 and the OA & M processor 108 may be embodied in a PIC16C77-20P microcontroller manufactured by Microchip Technology and an 80386 processor manufactured by Intel, respectively. Although these are shown and described herein as separate devices that perform different software instructions, it does not mean that the functionality of microcontroller 106 and OA & M processor 108 can be integrated into a single processing device. Those skilled in the art will easily understand. [0036] In addition, a second embodiment of the ANF module 100 includes an embedded test equipment (BITE) module 114 and a bypass switch 116, which are AS239-12 gallium arsenide unipolar dual throw contact switches available from the Hittite. It may be embodied in. The microcontroller 106 and the OA & M processor 108 have external memory 118, respectively. May be combined with 120. [0037] The scanner 102, which has a mixer 130, a discriminator 132, and a programmable local oscillator 134, typically interacts with the A / D 104 and the microcontroller 106 for narrowband interference in the signal provided by the splitter 24. Detect the presence. The mixer 130 and the programmable local oscillator 134 may be embodied in the MD-54-0005 mixer available from M / A-Com and the AD9831 direct digital synthesizer manufactured by Analog Devices, Inc., respectively. Further, the A / D 104 may be a stand-alone device that is fully integrated within the microcontroller 106 or coupled to the device. [0038] As described in more detail below, once narrow frequency interference is detected in the signal from the splitter 24, the microcontroller 106 controls and detects the notch modules 110, 112 via the serial bus 136. Eliminate narrowband interference. As shown in FIG. 7, the second embodiment of the ANF module 100 has two notch modules 110, 112, but additional notch modules may be added within the ANF module 100. The number of notch modules that can be used within the ANF module 100 is only limited by the signal degradation contributed by each notch module. Since multiple notch modules are provided, multiple narrowband interferences can be removed from the wideband signal from the splitter 24. For example, when three notch modules are provided, a wideband signal with a frequency spectrum 42, as shown in FIG. 4, is processed by the ANF module 110 and a filtered broadband with a frequency spectrum 50, as shown in FIG. Can generate signals. [0039] The scanner 102 performs its function as follows. The signal from the splitter 24 is coupled to the mixer 130, which receives the input from the programmable local oscillator 134. The mixer 130 mixes the signals from the splitter 24 to the IF, and the discriminator 132 analyzes this frequency to produce an RSSI measurement result, which is coupled to the A / D 104. The A / D 104 can convert the RSSI signal from an analog signal to a digital signal and process it by the microcontroller 106. The microcontroller 106 compares the output of the A / D 104 with the adaptive threshold previously determined by the microcontroller 106. Details on how microcontroller 106 determines the adaptive threshold are provided below. If the microcontroller 106 determines that the output of the A / D 104 representing the RSSI exceeds the adaptive threshold, the notch module 110 to filter the signal from the splitter 24 with the RSSI that exceeds the adaptive threshold at the IF. , One of 112 can be assigned. [0040] The microcontroller 106 also programs the local oscillator 134, which is programmable for the discriminator 132 to process, with the mixer 130 moving different parts of the frequency spectrum of the signal from the splitter 24 to the IF. For example, if there are 59 narrowband channels within the frequency band of one particular wideband channel, the microcontroller 106 will program a sequential programmable local oscillator 134, which will mix each of the 59 channels with the mixer 132. It is reduced to IF, so that the discriminator 132 can produce RSSI measurements for each channel. Thus, the microcontroller 106 uses a programmable local oscillator 134, a mixer 130, and a discriminator 132 to measure the signal strength of each of the 60 narrowband channels within the frequency band of the wideband signal. .. By analyzing each of the 60 channels within the frequency band of the wideband signal, the microcontroller 106 can determine the adaptive threshold and whether narrowband interference is present in one or more narrowband channels. You can decide whether or not. [0041] Once the channel with narrowband interference is identified, the microcontroller 106 can program the notch modules 110, 112 to remove the most damaging interference, which is, for example, the most damaging interference. It may be a strong interference. In addition to the list of channels with interference, the microcontroller 106 may also store various other parameters, as described in detail below. Such lists may be transferred to reporting and control equipment, or base stations via the OA & M processor 108, and may be used for system diagnostic purposes. [0042] The purpose of the diagnosis is to control the narrowband receiver 28 to obtain specific information related to the interference, but not limited to this, and to reprocess this interference by communicating with its base station. Includes imposing (retask). For example, reporting and control equipment uses a narrowband receiver 28 to determine the identity of an interfering object, such as a mobile unit, by intercepting the electronic sequence number (ESN) of this mobile unit, which is the mobile unit. Is transmitted when transferring information on a narrowband channel. Knowing the identity of the interfering material, the reporting and control facility may contact the communication facility communicating with this mobile unit and request this communication facility to change the transmission frequency of the mobile unit (ie, this). The frequency of the narrow band channel transmitted by the mobile unit) or communication with the interfering mobile unit may be requested to be stopped all at once. [0043] Further, diagnostic purposes may include determining the phone number the mobile unit is trying to contact with the narrowband receiver 28 and selectively handling the phone. For example, reporting and control equipment uses the narrowband receiver 28 to determine that a user of this mobile unit is dialing 911 or any other emergency number, and calls the output of the narrowband receiver 28. By transmitting to the network, it can be determined that the narrowband receiver 28 needs to be used to handle this emergency call. [0044] FIG. 8 reveals one of the notch modules 110 in more detail and is substantially the same as any other notch module used in the ANF module 100. Can be. In general, the notch module 110 is an up, down or down, up filter having an operating principle similar to the ANF module 60 described in connection with FIG. Specifically, the notch module 110 is the first and second mixer 150, It comprises 152, each of which receives an input signal from a phase-locked loop (PLL) 154. The PLL is connected to the serial bus 136 of the microcontroller 106 via the logical block 156. Arranged between the mixer 150 and the mixer 152 is a notch filter block 158, which will be described in more detail below. For implementation, mixers 150 and 152 may be embodied in MD54-0005 type mixers available from M / A-Com, and PLL154 may be embodied in LMX2316TM type frequency synthesizer commercially available from National Semiconductor. It does not matter if it becomes. [0045] In the operation of the ANF module 100, the microcontroller 106 controls the PLL 154 to generate an output signal, which allows the first mixer 150 to move the frequency spectrum of the signal from the splitter 24 towards the IF. , This IF is the notch frequency of the notch filter block 158. Alternatively, in the case of a cascaded notch module, this notch module receives its input from another notch module rather than from the splitter 24. Also, the output of the PLL 154 is coupled with a second mixer, and after the notch filter block 158 removes narrowband interference, the frequency spectrum of the signal from the notch filter block 158 is moved and its source when received from the splitter 24. Return to the position of. The output of the second mixer 152 is further coupled to the filter 160, removing all unwanted image frequencies that the second mixer 152 can generate. The output of the filter 160 may be coupled directly to the wideband receiver 30 if no additional notch modules (eg, notch modules 112) or additional notch modules are used. [0046] In addition, the notch module 110 includes a bypass switch 164, which is used to bypass the notch module 110 in the absence of narrowband interference to be filtered or in the event of a notch filter 110 failure. Can be. For example, the microcontroller 106 uses the notch module 110 to close the bypass switch 164 when no interference to be filtered is detected. On the contrary, the microcontroller 106 opens the bypass switch 164 when interference is detected and the notch module 110 is used to filter such interference. [0047] As shown in FIG. 8, the notch filter block 158 includes a filter 165, which is, for example, a filter having a blocking band of about 15 KHz width at -40 dB. The blocking band of the filter 165 may be fixed, for example, at a center frequency of 150 MHz, or at any other frequency as long as the IF of the mixer 150 is located at an appropriate frequency. [0048] Although the notch filter block 158 of FIG. 8 shows only a single filter 165, a second embodiment of the notch filter block 166 has a switch 170 and a plurality of filters 172 to 178, as shown in FIG. Get ready. In such a configuration, each of the filters 172 to 178 has a notch frequency adjusted to the IF produced by the first mixer 150. In addition, each filter 172-178 may have a different blocking bandwidth at -40 dB. For example, as shown in FIG. 9, filters 172 to 178 have a blocking bandwidth from 15 KHz to 120 KHz. Filters with different blocking bandwidths allow the ANF Module 100 to select the filter with the optimum blocking bandwidth that best filters interference. [0049] During the operation of the second embodiment of the notch filter block 166, the microcontroller 106 controls the switch 170 to transmit the output signal from the first mixer 150 to one of the filters 172 to 178. The microcontroller 106 selects filters 172 to 178 with the most suitable notch switch for filtering the interference detected by the microcontroller 106 via the switch 170. For example, if the microcontroller 106 determines that interference is present on multiple continuous channels, the microcontroller 106 utilizes filters 172 to 178 that have a wide enough notch width to filter all such interference. It can, but this is in contrast to using a single filter to filter interference on individual channels. In addition, a single filter with wide bandwidth may be used when two narrowband channels with interference are separated by one narrowband channel without narrowband interference. A single wideband filter filters non-interfering narrowband channels, but the lost wideband signal information is negligible. [0050] Now that we've covered the hardware side of this system in detail, we'll turn our attention to the software side of this system. Of course, those skilled in the art will easily understand that software features can easily be made into Harware devices, such as application-specific integrated circuits (ASICs). Therefore, although the following description belongs to software, it should be considered that such a description is merely an example and is by no means limiting. [0051] Given the above, with reference to FIGS. 10-15, it contains multiple blocks representing software or hardware functions or routines. If such a block represents a software feature, the instructions that embody this feature can routinely be written in a high-level language, such as C, or any other suitable high-level language. Can be edited into a machine-readable format. Alternatively, the directives representing this block may be written in assembly code or in any other suitable language. Such a command may be stored in the microcontroller 106 or may be stored in the external memory 118 and may be called from here and executed by the microcontroller 106. [0052] As shown in FIG. 10, the main routine 200 has a plurality of blocks or routines described at a high level in relation to FIG. 10, and the details will be described in relation to FIGS. 11 to 15. .. The main routine 200 begins its execution at block 202, where the microcontroller 102 sets default values and prepares to perform the functions of the ANF module 100. After the default values have been set, control extends to block 204 to test the embedded test equipment (BITE) of the ANF module 100. [0053] After the BITE test is complete, control passes from block 204 to block 206 to perform signal processing and interference identification. After the interference is identified in block 206, control is passed to block 208, where the identified interference is extracted from the wideband signal received by the ANF module 100. [0054] After the interference is extracted in block 208, control passes to block 210, where a fault condition check is performed. The fault condition check is used to ensure that the ANF module 100 is operating in an appropriate manner by checking the overall fault of the ANF module 100. [0055] After the fault condition check is complete, control passes from block 210 to block 212 to perform interfering data preprocessing, including passing information generated by parts of blocks 202 to 210 from the microcontroller 106 to the OA & M 108. When the interference data preprocessing is completed, the main routine 200 ends its execution. The main routine 200 can be executed by the microcontroller 106, for example, at time intervals of every 20 ms. [0056] As shown in FIG. 11, the default value setting routine 202 begins execution at block 220, where the microcontroller 106 tunes the programmable local oscillator 134 to interfere with the first channel, indicated by F1. Scan. For example, F1 may be 836.52 MHz (MHz), as shown in FIG. Alternatively, as will be readily appreciated by those skilled in the art, the first channel to be tuned to the ANF Module 100 may be any frequency suitable within the frequency band of the wideband channel or the protection frequency band. .. [0057] After the microcontroller 106 is configured to scan for interference on the first frequency, control passes from block 220 to block 222 and sets a default value signal for the noise threshold. This noise threshold is used to determine the presence of narrowband interference in the wideband signal received from the splitter 24 in FIG. The following description provides details on how adaptive thresholds occur, but block 222 only sets an initial threshold for determining the presence of narrowband interference. [0058] [0058] When the setting of the default threshold is completed in block 222, control passes to block 224, where the microcontroller 106 reads various inputs and serially communicates with notch modules 110, 112 and any other serial communication device. In addition to establishing, it also establishes communication with the OA & M processor 108. After block 224 completes execution, the default value setting routine 202 returns control to the main program and block 204 is executed. [0059] FIG. 12 further reveals the details of the BITE test routine 204, which begins execution after routine 202 finishes. Specifically, the BITE test routine 204 begins execution at block 240, where the microcontroller 106 puts the notch modules 110, 112 into bypass mode by closing the bypass switch 190. After the notch modules 110, 112 are bypassed, the microcontroller 106 programs the BITE module 114 to generate an interferometer used to test the effectiveness of the notch modules 110, 112 for diagnostic purposes. Control is passed from block 240 to block 242 after the notch modules 110, 112 are bypassed and the BITE module 114 is ready for execution. [0060] In block 242, microcontroller 106 is A / D Read the interfering signal level at the output of the notch module 112 via 104. Since the notch modules 110, 112 are bypassed by the block 240, the interfering signal level at the output of the notch module 112 includes the interference caused by the BITE module 114. [0061] After the interfering signal level is read in block 242, block 244 determines if the read interfering level is appropriate. Since the notch modules 110, 112 are put into bypass mode by the block 240, the microcontroller 106 predicts that it will find an interfering object at the output of the notch module 112. If the level of interfering detected at the output of the notch module 112 does not meet the conditions (ie, too high or too low), control passes from block 244 to block 246, where a system error is declared. To. The declaration of a system error may include the microcontroller 106 notifying the OA & M processor 108 of this system error. The OA & M processor 108 can then report this system error to the control equipment. In addition, the declaration of a system error may include writing the fact that the system error has occurred in the external memory 118 of the microcontroller 106. [0062] Alternatively, if block 244 determines that the interfering level is appropriate, control extends from block 244 to block 248, where the microcontroller 106 applies one or more notch modules 110, 112. When the notch modules 110, 112 are applied (ie, not bypassed) by block 248, control extends to block 250 and reads the interfering signal level at the output of notch module 112. Since the BITE module 114 produces interference at the frequency to which the notch filter is adapted by block 248, it is expected that the notch modules 110, 112 will eliminate such interference. [0063] After the interfering signal level is read by block 250, control passes to block 252 to determine if interference is present. In the presence of interference, control passes from block 252 to block 246 and a system error is declared. This is because the notch modules 110, 112 need to suppress the interference caused by the BITE module 114, so that one or more notch modules 110, 112 are not functioning properly. Alternatively, if no interference is detected in block 252, the ANF module 100 functions properly and is therefore set to normal mode operation in block 254. After block 254 or block 246 completes execution, BITE test routine 204 returns control to main program 200 and begins execution of block 206. [0064] As shown in FIG. 13, the signal processing and interference identification routine begins execution at block 270. At block 270, the microcontroller 106 controls the programmable local oscillator 134 so that the microcontroller 106 controls the discriminator 132 and the A / D. Through 104, it is possible to read the signal strength of each of the desired channels. Specifically, the microcontroller 106 may control a programmable local oscillator 134 to sequentially tune a plurality of known channels. This adjustment moves each known channel towards the IF, so that the discriminator 132 can read the RSSI of the signal strength of each channel. Optionally, if one channel has a higher probability of having interference than another, the channel with this higher probability may be manipulated first. The channel can be determined to have a high probability of having interference based on previous interference patterns or based on the interference data observed by the ANF module 100. [0065] In addition, at block 270, the microcontroller 106 controls a local oscillator 134 that is programmable to frequency shift part of the protection band towards the IF, which causes the discriminator 132 to measure RSSI readings for this protection band. Can occur. Since this protection band is outside the frequency response of the filter located within the wideband receiver 30, block 270 will be attenuated by the receiver filter within the wideband receiver 30 by the amount that the protection band will be attenuated. By reducing such a reading value, the protection band signal strength reading is corrected. The correction is performed because the ANF module 100 is associated with the harmful effects of the narrowband signal on the wideband receiver 30. Therefore, signals having frequencies within the pass frequency band of the wideband receiver 30 filter need not be corrected, and signals within the protection band that will be filtered by the wideband receiver 30 by the receive filter are corrected. Need to be. In essence, the protected band correction has a frequency characteristic similar to that of a wideband receiver filter. For example, if a wideband receiver filter attenuates a particular frequency by 10 dB, the protected band reading at that particular frequency is attenuated by 10 dB. [0066] After block 270 exits, control extends to block 272 and multiple channels with the highest signal levels are selected. In general, the number of channels selected by block 272 corresponds to the number of notch modules 110, 112 used by a particular ANF module 100. Control passes from block 272 to block 274 after the channel with the highest signal level is selected by block 272. [0067] At block 274, the microcontroller 106 determines the adaptive threshold by calculating the average signal strength value of the desired channel read by block 270. However, this average is calculated without taking into account the channel with the highest signal level selected by block 272. Alternatively, it is possible to calculate the mean value including the signal level selected by this block 272. Block 274 calculates an average that is corrected by an offset and used to determine if narrowband interference is on any desired channel read by block 270. [0068] After block 274 completes execution, control passes to block 276 and compares the signal strength value of the channel selected by block 272 with the adaptive threshold. The adaptive threshold is the sum of the mean and offset calculated by the block 274 threshold. If the channel selected from block 272 has a signal strength above this adaptive threshold, control is passed to block 278. [0069] Block 278 points out which channels have interference based on which channels exceed the adaptation threshold. Such an indication is made, for example, by writing the information from the microcontroller 106 to the external memory 118 and passing this information to the OA & M processor 108. Control passes to block 280 after the interference is pointed out by block 278. In addition, if none of the channels selected by block 272 exceed the adaptive threshold, control is passed from block 276 to block 280. [0070] At block 280, the microcontroller 106 updates the interference data to point out the channel where the interference is present. Specifically, at each frame (eg, 20ms), the microcontroller 106 detects interference by comparing the power level (RSSI) on multiple channels with a threshold. If an interferer is detected, the data of that interferer is collected during the time the interferer is classified as an interferer (ie, the RSSI level for this channel is described below. Sufficient time to pass the hang time test (until below the threshold). All of this information is written to memory (eg, memory 118 or 120), which is accessed by the OA & M processor 108. The OA & M processor 108 processes this information to produce an interference report, as described below. [0071] In addition, block 280 reads input commands that may be received from OA & M processor 108. In general, such commands can be used to perform configuration and measurements on the ANF module 100. Specifically, this command can be a command that puts the ANF module 100 into various modes, such as the normal mode, the test mode in which the embedded test equipment is adopted or driven, or the ANF module 100. Includes bypass mode, etc., in which is completely bypassed. In addition, the command can be used to change the identification characteristics of the ANF module 100. For example, the command can change the identification number of the ANF module 100, identify the type of device used within the ANF module 100, identify the geographic location of the ANF module 100, or the time and date of the local clock within the ANF module 100. Can be used for configuration. In addition, the command controls the operation of the ANF module 100 by, for example, adding, modifying, or deleting narrowband channels scanned using the ANF module 100, or manually by setting a threshold to classify the signal as an interferer. Can be used to modify or scan. In addition, the attack and hang times described below can be changed using commands. In addition, commands can be used to disable the ANF module 100. [0072] After block 280 completes its execution, the signal processing and interference identification routine 260 returns control to main routine 200, which continues execution in block 208. [0073] As shown in FIG. 14, the interference extraction routine 208 begins execution at block 290 and compares the time in which the interferer was present with a reference time called the "allowable lifetime". This time can also be called the "attack time". If the interferer is present longer than this attack time, control is passed to block 292. Alternatively, if the interferer has not been present for longer than the permissible lifetime, control extends to block 296, which will be described in more detail below. In essence, the block 290 acts as a hysteresis function to prevent the filter from being assigned to temporary interferers as soon as such interferers appear. The permissible lifetime is generally on the order of 20 milliseconds, which is about the frame speed of a CDMA communication system. As can be easily understood by those skilled in the art, the frame speed is the speed at which the base station and the mobile unit exchange data. For example, if the frame speed is 20 ms, the mobile unit receives data from the base station every 20 ms. Block 90 adapts the mobile unit in the initial power-up process. As those skilled in the art can understand, the mobile unit is initially powered up with transmission power, which is almost near the transmission power limit of this mobile unit. Once the mobile unit that has completed the initial power-up establishes communication with the base station, the base station may support the mobile unit to reduce its transmission power. As the mobile unit reduces its transmission power, it may no longer be a source of interference for base stations with ANF modules. Therefore, the block 290 prevents the ANF module 100 from assigning the notch modules 110 and 112 to the interfering objects that disappear by themselves in a short time. [0074] At block 292, the microcontroller 106 determines if there are notch modules 110, 112 that are not currently used to filter the interfering material. If there is an available notch module, control extends from block 292 to block 294, the available notch module is operational and tuned to filter interfering matter present in the wideband signal from the splitter 24. .. After block 294 completes execution, control is passed to block 296, which is described below. [0075] However, if block 292 determines that no notch module is available, control extends from block 292 to block 298 and whether the current interferer is stronger than any interferer currently assigned to the notch module. Is determined. In essence, block 298 prioritizes the notch module so that the interfering material with the strongest signal level is filtered first. If block 298 determines that the current interferer is not stronger than any other interferer to which the notch module is assigned, control is passed from block 298 to block 296. [0076] Alternatively, if the current interferer is stronger than the interferer to which the notch module is assigned, control extends from block 298 to block 300. Block 300 determines if an interferer weaker than the current interferer passes the hang time test. This hang time test is used to prevent the ANF module 100 from disallocating the notch modules 110, 112 from the interfering material when the interfering material is temporarily in a damped state. For example, if the mobile unit is interfering and the notch modules 110, 112 are assigned to filter the interference, the mobile unit heads for an attenuation state where the interference level detected by the ANF module 100 is low. When so, the ANF module 100 does not deallocate the notch module used to filter this damped interference until this interference disappears at a time called the hang time. In essence, hang time is a hysteresis function that prevents the notch module from being quickly deallocated from interference that is only temporarily damped and returns over time. .. Therefore, if an interference weaker than the current interference passes the hang time test, control is passed to block 302. Alternatively, if an interference weaker than the current interference does not pass the hang time test, block 300 passes control to block 296. [0077] At block 302, the microcontroller 106 deactivates the notch module used to filter the weak interfering material and reassigns the same notch module to the stronger interfering material. Control is passed to block 296 after block 302 completes the reassignment of this notch module. [0078] In block 296, the microcontroller 106 rearranges the interference from the lowest level to the strongest level and assigns the notch to the strongest level of interference. Like block 298, block 296 performs a prioritization function to ensure that the strongest interferers are filtered by the notch module. In addition, block 296 can analyze the interference patterns detected by the ANF module 100 and assign filters 172 to 178 with varying notch widths to filter interfering objects. For example, if the ANF module 100 detects that interference on a continuous channel has an overall frequency bandwidth of 50KHz, use the 50KHz filter 176 rather than the four 15KHz filters in the notch filter block 158. And filter such interference. Such techniques essentially free the notch filter modules 100, 112 to filter for additional interference. [0079] After block 296 finishes executing, control passes to block 304 and updates the interference data by transmitting a list of channels and the interference state to a memory that can be accessed by the OA & M processor 108 (eg, memory 118 or 120). After block 304 finishes executing, the interference extraction routine 208 returns control to the main module 200 and continues execution in block 210. [0080] [0080] At block 210, the microcontroller 106 determines if the entire failure has occurred in the ANF module 100, as shown in FIG. Such a determination can be made, for example, by determining whether the voltage output from the voltage regulator of the ANF module 100 has an appropriate output voltage. Instead, the overall failure can be determined by examining whether each of the notch modules 100, 112 is inoperable. If each of the notch modules were inoperable, the entire ANF module 100 would fail. In any case, control is blocked from block 320 at the point where the microcontroller 106 disables the bypass switch 116 in Figure 7 and avoids all of the notch modules 110, 112 of the ANF module 100 in the event of an overall failure. Over 322, thereby effectively coupling the splitter 24 directly to the wideband receiver 30. After the execution of block 322, or if block 320 determines that no overall failure will occur, control returns to main routine 200 and continues execution at block 212. Interference data written in memory 118 or 120 at block 212 is passed to the OA & M processor 108. [0081] When describing software functions that can be performed by microcontroller 106, attention is directed to OA & M processor 108 in FIG. When the blocks shown in FIGS. 16 and 17 represent software features, the instructions that embody the features are written as routines in advanced languages, such as C or other compatible advanced languages, and are machine-read. Can be compiled into a possible format. Alternatively, the block's surrogate instructions may be written in assembly code or other compatible language. Such instructions can be stored in the OA & M processor 108 or stored in the external memory 120 and can be called from there for execution by the OA & M controller 108. [0082] In particular, the main routine 340 executed by the OA & M processor 108, cited herein as a whole as FIGS. 16 and 17, as shown in FIGS. 16 and 17, begins execution at block 342, where the OA & M processor. The 108 is itself initialized by establishing communications, checking alarm conditions, and accomplishing common household chores. At block 342, the OA & M processor 108 is initialized and passes control to block 344. [0083] At block 344, OA & M processor 108 determines if there is new data to read from the OA & M buffer (not shown). If block 344 determines that there is new data to read, control passes to block 346 to determine if the new data is valid. If new data is valid, control passes from block 346 to block 348 and reads the data from the OA & M buffer. Instead, if block 346 determines that the new data is invalid, control passes from block 346 to block 350 and resets the OA & M buffer. After execution of block 348 or block 350, control extends to block 352, as described in more detail here. [0084] If it returns to block 344 and determines that there is no new data to read by block 344, control goes to block 360 and calculates the power level of each channel scanned by the ANF module 100. The OA & M processor 108 can calculate the power level in block 360 because the data generated when the microcontroller 106 of the ANF module 100 scans various channels is stored in a buffer that can be read by the OA & M processor 108. .. [0085] After the power level is calculated in block 360, control passes to block 362 to determine if any of the calculated power levels exceed a predetermined threshold. If the calculated power level exceeds a predetermined threshold, control passes from block 362 to block 364 and records the duration and time of the interfering material before passing control to block 366. Instead, if block 362 determines that none of the power levels calculated in block 360 exceed a predetermined threshold, control is passed directly from block 362 to block 366. [0086] Block 366 determines if the evaluated interfering material was previously shown as an interfering material. If block 366 determines that the evaluated interfering material was not previously shown as an interfering material, control is passed to block 352. Instead, block 366 passes control to block 368. [0087] At block 368, the OA & M processor 108 determines if this interferer is the previous interferer that disappeared, and if so, the OA & M processor 108 passes control to block 370. Instead, control is passed from block 368 to block 372 if this interferer has not disappeared. [0088] At block 370, the OA & M processor 108 stores the start time and persistence of the interfering material. Such information may be stored within the OA & M processor 108 itself or within the external memory 120 of the OA & M processor 108. After block 370 completes execution, control is passed to block 352. At block 372, the persistence of the interfering material increases to represent the time during which the interfering material appears. After execution of block 372, control is passed to block 352. [0089] Block 352 determines if the instruction was received by the OA & M processor 108 from the recording and control equipment. When such an instruction is received, control is passed from block 352 to block 380. At block 380, the OA & M processor 108 determines whether the instruction is to the microcontroller 106 of the ANF module 100, or whether the instruction is to the OA & M processor 108. If the instruction was to microcontroller 106, control passes from block 380 to block 382 and sends the instruction to microcontroller 106. After the execution of block 382, the main routine 340 ends. [0090] Instead, if the instruction received by the OA & M processor 108 is not an instruction to the microcontroller 106, control passes from block 380 to block 384 and prepares a response to the instruction. The response can have a brief cognition or can have a response that contains the important data requested. In addition, detailed content on block 384 is provided in connection with FIG. After block 384 prepares the response, block 386 activates continuous jamming of OA & M processor 108 and finishes execution of main routine 340. [0091] Instead, if block 352 determines that no instructions have been received, control passes from block 352 to block 390 to determine if the bypass switch 116 in FIG. 7 is closed (ie, bypass is on). If block 390 determines that bypass is not on, execution of main routine 340 ends. Instead, if block 390 determines that bypass is on, control is passed from block 390 to block 392. [0092] At block 392, the OA & M processor 108 determines if there was a previous user's instruction to bypass the ANF module 100 utilizing the bypass switch 116. When such a user's instruction is given, the execution of the main routine 340 ends. Instead, if there was no previous user's instruction to attach a bypass to the ANF module 100, control goes from block 392 to block 394 and compares the bypass time with the hold time. If the bypass time exceeds the retention time, for example 1 minute, control is passed from block 394 to block 396. [0093] At block 396, alarms are generated by the OA & M processor 108, and such alarms communicate with the recording and control equipment, for example, by pulling up the communication line connected to the recording and control equipment 24 volts higher. After the execution of block 396, the main routine 340 ends. [0094] Instead, if block 394 determines that the bypass time does not exceed the retention time, control passes from block 394 to block 398, counting down the retention time, thereby presenting a bypass time close to the retention time. Eventually, after block 398 shows a sufficient reduction in retention time, block 394 determines that the bypass time exceeds the retention time and passes control to block 396. The main routine 340 exits after block 398 has fully executed. [0095] As illustrated in FIG. 18, the prepare response routine 384 begins execution at block 400. At block 400, the OA & M processor 108 reads the information that the microcontroller 106 has written to the buffer (ie, memory 118 or 120), calculates the coherent time, calculates the coherent power level, and calculates the average signal strength. calculate. This information is stored locally within the ANF module and can be reported back to the network administrator in real time. Such reports may be carried out wirelessly or via a leased line or internet connection. Interferant power levels and average signal strength can be used to assess spectral conservation in geographic regions and detect the presence of any fixed interferometers that affect base station execution. In addition, such information can be used in connection with base station execution and interference experienced by the base station. After the execution of block 400 is completed, control is passed to block 402. [0096] At block 402, the OA & M processor 108 adds a real-time marker to the information calculated at block 400 and stores the reporting information with the real-time marker and the information calculated at block 400. Such information may be stored within the OA & M processor 108 itself or within the external memory 120 of the OA & M processor 108. [0097] After the execution of block 402 ends, control passes to block 404 to determine if the instruction was received by the ANF module 100. Such instructions may be received from the recording and control equipment. If block 404 determines that no instructions have been received by OA & M processor 108, control passes back from block 404 to main routine 340 and continues execution in block 386. [0098] Instead, if block 404 determines that the instruction was received by the OA & M processor 108, control passes from block 404 to block 406, and the received instruction records the operation of ANF module 100, such as recording and control equipment. Determines what control instructions are used to control from a remote location. If block 406 determines that the instruction received is a control instruction, block 406 transfers control to block 408 and takes the action supported by the instruction. Instructions include, for example, instructions that enable or disable remote control of the ANF module 100, or instructions that may have other suitable instructions. After the execution of block 408, control passes back from the prepared response routine 384 to the main routine 340, at which time it ends execution. [0099] Instead, if block 406 determines that the instruction received by the OA & M processor 108 is not a control instruction, control passes from block 406 to block 410 to determine if the instruction received is a reporting instruction. If the instruction is not a reporting instruction, block 410 returns control to the main routine 340. Instead, if block 410 determines that the instruction received is a reporting instruction, control passes from block 410 to block 412, prepares, and sends an interference report. The interference report has information indicating the parameters of the latest 200 interferometers detected by the ANF module 100, as well as the information that the microcontroller 106 sends to the memories 118, 120 that the OA & M processor 108 accesses to prepare the interference report. Has. The interference report has the frequency number (channel) at which the interference was detected, the RF level of the interference, the time the interference appeared, the time the interference was present, and the wideband signal strength in which the interference was present, if the interference was present. .. [0100] In addition to the interference report, the OA & M processor 108 may prepare several different reports to add to the interference report. Such additional reports include mode reports (ANF module 100 operating mode reports), status reports (ANF module 100 alarms and system failure reports), software and firmware version reports, header reports (base station name, wideband carrier). Has center frequency, number of antennas and base station area reports), date reports, time reports, activity reports (frequency number, RF level, interference start time, interference persistence, and wideband channel strength records), and summary reports. .. [0101] Interference reports are used for diagnostic purposes in communication network systems, including determining when a network administrator will use the narrowband receiver 28 to determine the phone number that the mobile unit will connect to and optionally address. Can be done. For example, the recording and control equipment utilizes a narrowband receiver 28 and the user of the mobile unit decides to dial 911 or another emergency number, and therefore the narrowband receiver 28 is a narrowband receiver. Determine that 28 outputs will be used to deal with emergency calls by directing the telephone network. [0102] In addition, the interference report will determine when the network administrator will control the narrowband receiver 28 and obtain special information related to the interference and reprocessing the interference by communicating with its base station. Can be used. For example, the recording and control equipment utilizes a narrowband receiver 28, and when the mobile unit transmits information on a narrowband communication path, the mobile unit is transmitted by interfering with the electronic serial number (ESN) of the mobile unit. Determine the identification of interfering substances such as. When identifying an interfering object, the recording and control equipment should contact the communication facility communicating with the mobile unit to change the transmission frequency of the mobile unit (ie, the frequency of the narrowband channel on the transmission of the mobile unit). May request the communication facility, or may request the communication facility to interrupt all communication with the interfering mobile unit together. [0103] In addition, interference reports are used by network administrators and the information provided in the interference reports is relevant to system execution. Such associations can be used to determine the effectiveness of the ANF module 100 over increasing system capacity. [0104] After the execution of block 412 is complete, control returns to main routine 340 and continues execution in block 386. [0105] With reference to FIG. 19, the data buffer interrupt function 500 is executed by the OA & M processor 108 and can be used to check and indicate the existence of valid data. Function 500 starts execution at block 502 and checks the data. [0106] After executing block 502, control passes to block 504 and checks if the data is valid. If block 504 determines that the data is valid, control passes from block 504 to block 506 and sets a valid data identifier prior to the end of function 500. Instead, if block 504 determines that the data is not valid, control passes from block 504 to block 508 and sets an invalid data identifier prior to the end of function 500. [0107] Many modifications and other embodiments of the present invention will be apparent to those skilled in the art by the above description. For example, while the above description specifically addresses the concept of removing interference from signals on a 30KHz narrowband channel that interferes with a 1.25MHz wideband signal, such a concept corresponds to a wideband channel, eg, 5, It will be appreciated without hesitation that it can be applied to continuous channels with a bandwidth of 10, or 15 MHz, or a total bandwidth of 5, 10, or 15 MHz. To accommodate such wider bandwidths, downconverters lined up to cover the 1.25MHz block of the channel can be operated in parallel. As a result, this description may be construed as an example and not limited to the scope of the present invention. The details of the configuration can be changed substantially without departing from the spirit of the present invention, and the limited use of all changes within the scope of the appended claims is retained. [0108] Although these and other features of the invention will be apparent to those skilled in the art by description of preferred embodiments made by reference to the drawings, a brief description of these drawings is provided below. [Simple explanation of drawings] FIG. 1 is an example of a diagram of a communication system. FIG. 2 is an example of the base station shown in FIG. FIG. 3 is an example of a frequency spectrum of a wideband signal without interference. FIG. 4 is an example of the frequency spectrum of a wideband signal in which three narrowband interferences are present. FIG. 5 is an example of a frequency spectrum of a wideband signal with three narrowband interferences removed. FIG. 6 is an example of one embodiment of the adaptive notch filter (ANF) module of FIG. FIG. 7 is an example of a second embodiment of the ANF module of FIG. 8 is an example of the notch module of FIG. 7. FIG. 9 is an example of a second embodiment of the notch filter block of FIG. 8. FIG. FIG. 10 is an example of a flow diagram of a main routine executed by the microcontroller of FIG. 11 is an example of a flow diagram of default numerical settings executed by the microcontroller of FIG. 7. FIG. FIG. 12 is an example of a flow diagram of a built-in test equipment (BITE) test routine executed by the microcontroller of FIG. FIG. 13 is an example of a flow diagram of a signal processing and interference identification routine executed by the microcontroller of FIG. FIG. 14 is an example of a flow diagram of an interference extraction routine executed by the microcontroller of FIG. FIG. 15 is an example of a flow diagram of a failure state check routine executed by the microcontroller of FIG. FIG. 16 forms an example of the flow diagram of the main routine executed by the operation of FIG. 7, Alarm Metrics (OA & M) processor. FIG. 17 forms an example of the flow diagram of the main routine executed by the operation of FIG. 7, Alarm Metrics (OA & M) processor. FIG. 18 is an example of a flow diagram of a response preparation routine executed by the OA & M processor of FIG. FIG. 19 is an example of a flow diagram of a data buffer interrupt function executed by the OA & M processor of FIG.
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| Written permission of extension of timeJAPANESE INTERMEDIATE CODE: A602A602 | A602 | |
| Written request for extension of timeJAPANESE INTERMEDIATE CODE: A601A601 | A601 | |
| Notification of reasons for refusalJAPANESE INTERMEDIATE CODE: A131A131 | A131 | |
| Report on retrievalJAPANESE INTERMEDIATE CODE: A971007A977 | A977 | |
| Written request for application examinationJAPANESE INTERMEDIATE CODE: A621A621 | A621 |
Numbers
- Publication
- 5124709
- Publication, DOCDB
- 5124709
- Publication, EPODOC
- JP5124709B
- Application
- 574988
- Application, DOCDB
- 2001574988
- Application, EPODOC
- JP20010574988
Titles2
- Japanese
- 干渉の検出、識別、抽出、および報告
- English
- Interference detection, identification, extraction, and reporting
Classification
- CPC, 24
- H04B7/005
- H04W72/541
- H04B1/1036
- H04W28/04
- H04B1/7103
- H04W24/08
- H04B1/10
- H04W28/20
- H04W88/02
- H04W88/08
- H04W24/02
- H04W24/04
- H04B1/71
- H04B15/00
- H04B2001/1063
- H04W72/0453
- H04W24/00
- H04W72/542
- H04B2201/709709
- H04B2201/709718
- H04W52/243
- H04W52/245
- H04W24/10
- H04W28/16
- IPC, 4
- H04B1 10
- H04W72 54
- H04B7 005
- H04J13 00
