JPH02146836A - Receiver for master station of time division multi-direction multiplex communication system - Google Patents
Receiver for master station of time division multi-direction multiplex communication systemInfo
- Publication number
- JPH02146836A JPH02146836A JP29943088A JP29943088A JPH02146836A JP H02146836 A JPH02146836 A JP H02146836A JP 29943088 A JP29943088 A JP 29943088A JP 29943088 A JP29943088 A JP 29943088A JP H02146836 A JPH02146836 A JP H02146836A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- received
- electric field
- reception
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005684 electric field Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、一つの親局と複数の子局とから構成される時
分割多方向多重通信システムに関し。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time-division multidirectional multiplex communication system comprising one master station and a plurality of slave stations.
特に親局用受信装置に関する。In particular, it relates to a receiving device for a master station.
従来、この種の時分割多方向多重通信システムの親局用
受信装置は、第２図の構成となっている。Conventionally, a receiving device for a master station in this type of time-division multidirectional multiplex communication system has the configuration shown in FIG.
第２図を参照して、親局用受信装置は、各子局から送信
された無線周波数のバースト信号１０を受信し、中間周
波数信号２０に変換するＲＦ（Ｒａｄｉｏ Ｆｒｅｑｕ
ｅｎｃｙ）信号受信回路１０１と。Referring to FIG. 2, the master station receiving device receives a radio frequency burst signal 10 transmitted from each slave station and converts it into an intermediate frequency signal 20.
ency) signal receiving circuit 101.
ＲＦ信号受信回路１０１から出力される中間周波数信号
２０からベースバンド信号３０を復調する復調回路１０
３と、復調回路１０３から出力されるベースバンド信号
３０の受信信号処理を行なう受信信号処理回路１０４と
、復調回路１０３から出力されるベースバンド信号３０
の誤りを検出するピットエラーレート計数回路１０５及
びＯＲＯ（Ｃｙｃｌｅ Ｒｅｄｕｎｄａｎｃｙ Ｃｈｅ
ｃｋ ）チエツク回路１０６と、ピットエラーレート計
数回路１０５の出力信号４０及びＣＲＣチエツク回路１
０６の出力信号５０とに基づいて受信信号の良否判定を
行なう受信信号判定回路１０７と全備えている。Demodulation circuit 10 demodulates baseband signal 30 from intermediate frequency signal 20 output from RF signal reception circuit 101
3, a received signal processing circuit 104 that performs received signal processing of the baseband signal 30 output from the demodulation circuit 103, and a baseband signal 30 output from the demodulation circuit 103.
pit error rate counting circuit 105 and ORO (Cycle Redundancy
ck) Check circuit 106, output signal 40 of pit error rate counting circuit 105, and CRC check circuit 1
06, and a received signal determination circuit 107 that determines the quality of the received signal based on the output signal 50 of 06.
〔発明が解決しよ５とする問題点〕
上述した従来の時分割多方向多重通信システムの親局受
信装置では、子局がバースト信号を送信していない無線
チャンネル状態では、 ＲＦ受信回路１０１でノイズ
を受信してしまい、このノイズが復調回路１０６で復調
されると、ランダムなベースバンド信号となってしまう
。この時、ピットエラーレート計数回路１０５及びＯＲ
Ｃチエツク回路１０６ではランダムな入力信号に対して
は誤りが検出できない場合がある。[Problems to be Solved by the Invention] In the above-described master station receiving device of the conventional time division multiplex communication system, in a wireless channel state in which a slave station is not transmitting a burst signal, the RF receiving circuit 101 When noise is received and this noise is demodulated by the demodulation circuit 106, it becomes a random baseband signal. At this time, the pit error rate counting circuit 105 and the OR
The C check circuit 106 may not be able to detect errors in random input signals.
従って、子局からの受信信号が実際には無いにもかかわ
らず、受信信号判定回路１０７は正常信号受信と判定し
てしまうという問題点がある。Therefore, there is a problem in that the received signal determining circuit 107 determines that a normal signal has been received even though there is actually no received signal from the slave station.
Ｃ問題点を解決するための手段〕
本発明の時分割多方向多重通信システムの親局用受信装
置は、各子局から送信された無線周波数のバースト信号
を受信し、中間周波数信号に変換するＲＦ信号受信回路
と、ＲＦ信号受信回路から出力される中間周波数信号か
ら受信電界を検出する受信電界検出回路と、ＲＦ信号受
信回路から出力される中間周波数信号よりベースバンド
信号を復調する復調回路と、復調回路から出力されるペ
ーストバンド信号の受信信号処理を行なう受信信号処理
回路と、復調回路から出力されるベースバンド信号の誤
りを検出する誤り検出回路と、誤り検出回路の出力信号
と受信電界検出回路の出力信号とに基づいて受信信号の
良否判定を行なう受信信号判定回路とを有することを特
徴として（・る。Means for Solving Problem C] The receiving device for the master station of the time division multiplex communication system of the present invention receives the radio frequency burst signal transmitted from each slave station and converts it into an intermediate frequency signal. An RF signal receiving circuit, a received electric field detection circuit that detects a received electric field from an intermediate frequency signal output from the RF signal receiving circuit, and a demodulation circuit that demodulates a baseband signal from the intermediate frequency signal output from the RF signal receiving circuit. , a reception signal processing circuit that performs reception signal processing of the pasteband signal output from the demodulation circuit, an error detection circuit that detects errors in the baseband signal output from the demodulation circuit, and an output signal and reception electric field of the error detection circuit. It is characterized by having a received signal determination circuit that determines the quality of the received signal based on the output signal of the detection circuit.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
ＲＦ信号受信回路１０１は各子局から送信された無線周
波数のバースト信号１０を受信し。The RF signal receiving circuit 101 receives a radio frequency burst signal 10 transmitted from each slave station.
中間周波数信号２０に変換する。受信電界検出回路１０
２は、ＲＦ信号受信回路１０１から出力される中間周波
数信号２０より受信電界を検出する。復調回路１０３は
、ＲＦ信号受信回路１０１から出力される中間周波数信
号よりベースバンド信号３０を復調する。受信信号処理
回路１０４は、復調回路１０３から出力されるベースバ
ンド信号３０の受信信号処理を行なう。It is converted into an intermediate frequency signal 20. Received electric field detection circuit 10
2 detects a received electric field from the intermediate frequency signal 20 output from the RF signal receiving circuit 101. The demodulation circuit 103 demodulates the baseband signal 30 from the intermediate frequency signal output from the RF signal receiving circuit 101. The received signal processing circuit 104 performs received signal processing on the baseband signal 30 output from the demodulation circuit 103.
ピットエラーレート計数回路１０５及びＯＲＣチエツク
回路１０６は、それぞれ復調回路１０６から出力される
ベースバンド信号３０の誤りを検出する。受信信号判定
回路１０７は、ピットエラーレート計数回路１０５の出
力信号４０とＯＲＣチエツク回路１０６の出力信号５０
と受信電界検出回路１０２の出力信号６０とに基づいて
受信信号の良否判定を行なう。A pit error rate counting circuit 105 and an ORC check circuit 106 detect errors in the baseband signal 30 output from the demodulation circuit 106, respectively. The received signal judgment circuit 107 receives the output signal 40 of the pit error rate counting circuit 105 and the output signal 50 of the ORC check circuit 106.
The quality of the received signal is determined based on the output signal 60 of the received electric field detection circuit 102.
次に第１図のブロック図の動作について説明する。Next, the operation of the block diagram in FIG. 1 will be explained.
まず、子局がバースト信号を送信している無線チャンネ
ルに関しては、ＲＦ信号受信回路１０１で受信した信号
が復調回路１０３でベースバンド信号に復調され、この
信号に誤りが有るかどうかがピットエラーレート計数回
路１０５及びＣＲＣチエツク回路１０６にてチエツクさ
れる。First, regarding the radio channel through which the slave station is transmitting the burst signal, the signal received by the RF signal receiving circuit 101 is demodulated into a baseband signal by the demodulation circuit 103, and whether or not there is an error in this signal is determined by the pit error rate. It is checked by a counting circuit 105 and a CRC check circuit 106.
さらに、受信電界検出回路１０２により子局から受信し
たバースト信号の受信電界が検出され、受信信号判定回
路１０７はピットエラーレート計数回路１０５．ｃｒｔ
ｃチエツク回路１０６゜受信電界検出回路１０２の全て
の出力信号が正常である時にのみ正常信号受信と判定す
る。Further, the received electric field detection circuit 102 detects the received electric field of the burst signal received from the slave station, and the received signal determination circuit 107 detects the received electric field of the burst signal received from the slave station. crt
c-check circuit 106. It is determined that a normal signal has been received only when all output signals of the received electric field detection circuit 102 are normal.
一方、子局がバースト信号を送出していない無線チャン
ネルに関しては、ＲＦ受信回路１０１でノイズを受信し
てしまい、このノイズが復調回路１０３で復調されると
、ランダムなベースバンド信号となってしまう。この時
、ビットエラーレート計数回路１０５及びＯＲＯチエツ
ク回路１０６ではランダムな入力信号に対しては誤りが
検出できない場合がある。ところが、受信電界検出回路
１０２では受信電界が検出されないため、これにより受
信信号判定回路１０７は正常信号受信と判定しない。On the other hand, regarding radio channels to which the slave station does not transmit burst signals, the RF receiving circuit 101 receives noise, and when this noise is demodulated by the demodulation circuit 103, it becomes a random baseband signal. . At this time, the bit error rate counting circuit 105 and the ORO check circuit 106 may not be able to detect errors in random input signals. However, since the received electric field detection circuit 102 does not detect the received electric field, the received signal determination circuit 107 does not determine that a normal signal has been received.
以上説明したように２本発明では２時分割多方向多重通
信システムの親局用受信装置に受信電界検出回路を設け
、子局からの受信信号の受信電界を検出するようにした
ため、子局がバースト信号を送信していない無線チャン
ネルに関して、ノイズを正常信号と確実に区別できると
いう効果がある。As explained above, in the present invention, a received electric field detection circuit is provided in the receiving device for the master station of the two-time division multidirectional multiplex communication system to detect the received electric field of the received signal from the slave station. This has the effect of reliably distinguishing noise from normal signals for wireless channels that do not transmit burst signals.
第１図は本発明の一実施例を示すブロック図。
第２図は従来例を示すブロック図である。
１０１・・・ＲＦ信号受信回路、１０２・・・受信電界
検出回路、１０３・・・復調回路、１０４・・・受信信
号処理回路、１０５・・・ピットエラーレート計数回路
。
１０６・・・ＣＲＣチエツク回路、１０７・・・受信信
号判定回路。FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing a conventional example. 101... RF signal receiving circuit, 102... Received electric field detection circuit, 103... Demodulation circuit, 104... Received signal processing circuit, 105... Pit error rate counting circuit. 106... CRC check circuit, 107... Received signal determination circuit.
Claims (1)
から前記各子局に対しては連続波を用い、前記各子局か
ら前記親局に対してはバースト波を用いて通信を行なう
時分割多方向多重通信システムに用いられ、前記各子局
から送信された無線周波数のバースト信号を受信し、中
間周波数の信号に変換する信号受信回路と、該信号受信
回路から出力される中間周波数信号より受信電界を検出
する受信電界検出回路と、前記信号受信回路から出力さ
れる中間周波数信号よりベースバンド信号を復調する復
調回路と、該復調回路から出力されるベースバンド信号
の受信信号処理を行なう受信信号処理回路と、前記復調
回路から出力されるベースバンド信号の誤りを検出する
誤り検出回路と、前記誤り検出回路の出力信号と前記受
信電界検出回路の出力信号とにより受信信号の良否判定
を行なう受信信号判定回路とを備えることを特徴とする
時分割多方向多重通信システムの親局用受信装置。1. Consisting of one master station and a plurality of slave stations, continuous waves are used from the master station to each of the slave stations, and burst waves are used from each of the slave stations to the master station. It is used in a time division multidirectional multiplex communication system for communication, and includes a signal receiving circuit that receives a radio frequency burst signal transmitted from each of the slave stations and converts it into an intermediate frequency signal, and a signal receiving circuit that receives the radio frequency burst signal transmitted from each slave station and converts it into an intermediate frequency signal. a received electric field detection circuit that detects a received electric field from an intermediate frequency signal, a demodulation circuit that demodulates a baseband signal from the intermediate frequency signal output from the signal reception circuit, and a reception of the baseband signal output from the demodulation circuit. A received signal processing circuit that performs signal processing, an error detection circuit that detects errors in the baseband signal output from the demodulation circuit, and a received signal by the output signal of the error detection circuit and the output signal of the received electric field detection circuit. 1. A receiving device for a master station in a time division multi-directional multiplex communication system, comprising: a received signal determining circuit for determining the quality of a received signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29943088A JPH02146836A (en) | 1988-11-29 | 1988-11-29 | Receiver for master station of time division multi-direction multiplex communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29943088A JPH02146836A (en) | 1988-11-29 | 1988-11-29 | Receiver for master station of time division multi-direction multiplex communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02146836A true JPH02146836A (en) | 1990-06-06 |
Family
ID=17872470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29943088A Pending JPH02146836A (en) | 1988-11-29 | 1988-11-29 | Receiver for master station of time division multi-direction multiplex communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02146836A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57164635A (en) * | 1981-04-03 | 1982-10-09 | Toshiba Corp | Squelch system for every direction in time division multiplex and time division multidirectional communication |
| JPS57183144A (en) * | 1981-05-06 | 1982-11-11 | Toshiba Corp | Frame constitution system for digital multidirectional multiplex system |
| JPS6282835A (en) * | 1985-10-08 | 1987-04-16 | Nec Corp | Time division multidirectional multiplex communication system |
-
1988
- 1988-11-29 JP JP29943088A patent/JPH02146836A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57164635A (en) * | 1981-04-03 | 1982-10-09 | Toshiba Corp | Squelch system for every direction in time division multiplex and time division multidirectional communication |
| JPS57183144A (en) * | 1981-05-06 | 1982-11-11 | Toshiba Corp | Frame constitution system for digital multidirectional multiplex system |
| JPS6282835A (en) * | 1985-10-08 | 1987-04-16 | Nec Corp | Time division multidirectional multiplex communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4646082A (en) | Inbound acknowledgement stack | |
| WO2004042528A3 (en) | Signal communication coordination | |
| US4972510A (en) | Method and apparatus for squelching dependent on detected bond rate to reduce unwanted audible noise on a mixed voice data channel | |
| CA2392871A1 (en) | Allocation of channels to radio transceivers | |
| CA1232020A (en) | Channel monitoring circuit for use in a repeater station over radio digital transmission | |
| JPH02146836A (en) | Receiver for master station of time division multi-direction multiplex communication system | |
| JP2884650B2 (en) | Bit error rate measurement device for traffic channel | |
| JPS6243925A (en) | Fault detection system of diversity receiver | |
| JP2005203898A (en) | Digital wireless communication apparatus | |
| JP3686469B2 (en) | Entrance / exit monitoring device | |
| JPH0447729A (en) | Diversity system fm multiplex broadcast receiver | |
| JP2655117B2 (en) | Frequency hopping control method | |
| JPH0834631B2 (en) | Digital mobile communication system | |
| JPH0749878Y2 (en) | Receiver failure detection circuit | |
| KR100326326B1 (en) | Apparatus for measuring received signal strength indicator in radio communication system | |
| JPS5824526Y2 (en) | reception noise detector | |
| JPH01204544A (en) | Data collision prevention system | |
| JPH09284192A (en) | Diversity reception method and diversity receiver | |
| JP2712853B2 (en) | Empty channel detection method | |
| JPH0522211A (en) | Transmission power controller for radio communication equipment | |
| JPH054860B2 (en) | ||
| JPH0654385A (en) | Data transmitter-receiver | |
| JPH06252840A (en) | Transmission arbitration device in cellular telephone system | |
| JPH01125130A (en) | Idle channel discrimination system for cordless telephone system | |
| JPH0297132A (en) | Diversity reception system |