JPH0775341B2 - Digital wireless communication system - Google Patents
Digital wireless communication systemInfo
- Publication number
- JPH0775341B2 JPH0775341B2 JP1279847A JP27984789A JPH0775341B2 JP H0775341 B2 JPH0775341 B2 JP H0775341B2 JP 1279847 A JP1279847 A JP 1279847A JP 27984789 A JP27984789 A JP 27984789A JP H0775341 B2 JPH0775341 B2 JP H0775341B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- digital
- communication system
- wireless communication
- transmission
- 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.)
- Expired - Fee Related
Links
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000001514 detection method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、送信装置と受信装置とが無旋回線を介して接
続されたデジタル無線通信システムに関する。TECHNICAL FIELD The present invention relates to a digital wireless communication system in which a transmitter and a receiver are connected via a non-turning line.
従来、この種のデジタル無線通信システムでは、送信装
置は、当該送信装置に障害が発生した場合、デジタル送
信信号として固定パターン信号を発生し、受信装置で
は、この固定パターン信号をデジタル受信信号として受
信したとき、送信装置で障害が発生したと判断してい
た。Conventionally, in this type of digital wireless communication system, a transmitting device generates a fixed pattern signal as a digital transmission signal when a failure occurs in the transmitting device, and a receiving device receives this fixed pattern signal as a digital reception signal. At that time, it was determined that a failure occurred in the transmitter.
従来のデジタル無線通信システムでは、送信装置の障害
を検出したとき、送信装置が固定パターン信号を変復調
装置へ送るので、信号のマーク率及びスペクトラムが変
化し、受信装置が固定パターン信号を正しく復調できな
いという欠点がある。In the conventional digital wireless communication system, when a failure of the transmitter is detected, the transmitter sends the fixed pattern signal to the modulator / demodulator, so that the mark ratio and spectrum of the signal change, and the receiver cannot demodulate the fixed pattern signal correctly. There is a drawback that.
本発明によるデジタル無線通信システムは、送信装置と
受信装置とが無線回線を介して接続され、前記送信装置
は、前記受信装置へ前記無線回線を介してデジタル送信
信号を送信し、前記受信装置は前記デジタル送信信号を
デジタル受信信号として受信するデジタル無線通信シス
テムに於いて、前記送信装置は、当該送信装置に障害が
発生した場合、前記デジタル送信信号を反転した信号を
障害通知信号として前記受信装置へ送出する手段を有
し、前記受信装置は、前記デジタル受信信号として前記
障害通知信号を受信してフレーム同期がとれないとき
に、前記送信装置で障害が発生したと見なすことを特徴
とする。In the digital wireless communication system according to the present invention, a transmitting device and a receiving device are connected via a wireless line, the transmitting device transmits a digital transmission signal to the receiving device via the wireless line, and the receiving device is In a digital wireless communication system for receiving the digital transmission signal as a digital reception signal, the transmission device, when a failure occurs in the transmission device, a signal obtained by inverting the digital transmission signal as a failure notification signal as the reception device. The receiving device receives the failure notification signal as the digital reception signal and determines that a failure has occurred in the transmitting device when frame synchronization cannot be achieved.
以下、本発明の実施例について図面を参照して説明す
る。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図を参照すると、本発明の一実施例によるデジタル
無線通信システムは、送信装置と受信装置とを有する。Referring to FIG. 1, a digital wireless communication system according to an exemplary embodiment of the present invention includes a transmitter and a receiver.
送信装置は、分岐回路１と、送信符号変換回路2A,2S
と、送信符号処理回路3A,3Sと、障害検出回路4A,4Sと、
パイロット発生回路５と、送信切替器６と、データ反転
回路7A,7Sとを有する。送信切替器６は、現用側の信号
と予備側のパイロット発生回路５の出力信号とを切替え
るためのものである。The transmitter includes a branch circuit 1 and transmission code conversion circuits 2A and 2S.
A transmission code processing circuit 3A, 3S, a fault detection circuit 4A, 4S,
It has a pilot generation circuit 5, a transmission switch 6, and data inversion circuits 7A and 7S. The transmission switch 6 is for switching between the signal on the working side and the output signal of the pilot generating circuit 5 on the protection side.
受信装置は、フレーム同期回路8A,8Sと、受信信号処理
回路9A,9Sと、分配回路10と、同期切替回路11と、受信
符号変換回路12A,12Sと、切替器13と、パイロット検出
回路14とを有する。切替器13を予備側の信号を各現用側
へ分配するためのものである。パイロット検出回路14
は、パイロット発生回路５の出力信号を検出するための
ものである。The receiving device includes frame synchronization circuits 8A and 8S, reception signal processing circuits 9A and 9S, distribution circuit 10, synchronization switching circuit 11, reception code conversion circuits 12A and 12S, switching device 13, and pilot detection circuit 14. Have and. The switch 13 is for distributing the signal on the spare side to each working side. Pilot detection circuit 14
Is for detecting the output signal of the pilot generation circuit 5.
このような構成のデジタル無線通信システムにおいて、
送信装置で障害が発生したときには、障害検出回路4A
（4S）で障害を検出し、データ反転回路7A（7S）で送出
すべきデータを反転する。In the digital wireless communication system having such a configuration,
When a failure occurs in the transmitter, the failure detection circuit 4A
The fault is detected at (4S), and the data to be transmitted is inverted at the data inversion circuit 7A (7S).
これにより、変復調装置（図示せず）へ送る信号のマー
ク率及びスペクトラムを変えることなく、受信装置のフ
レーム同期回路8A（8S）でフレーム非同期となり、受信
装置で障害が発生する。したがって、現用回線から予備
回線に回線を切替えることができる。As a result, the frame synchronization circuit 8A (8S) of the receiving device becomes frame asynchronous without changing the mark ratio and the spectrum of the signal sent to the modulation / demodulation device (not shown), and a failure occurs in the receiving device. Therefore, the line can be switched from the working line to the protection line.
従来は、データ反転回路7A,7Sの代わりに、第２図に示
されるように、固定パターン発生回路７′A,7′Ｓが用
いられていた。Conventionally, fixed pattern generating circuits 7'A, 7'S have been used instead of the data inverting circuits 7A, 7S, as shown in FIG.
以上説明したように、本発明は、送信装置に障害が発生
した時に、デジタル送信信号を反転させることによっ
て、変復調装置へ送る信号のマーク率及びスペクトラム
を変えることなしに、受信装置で送信装置の障害を判別
することができ、現用回線から予備回線に切替えること
ができるという効果がある。As described above, according to the present invention, when a failure occurs in the transmission device, the digital transmission signal is inverted to change the mark ratio and spectrum of the signal sent to the modulation / demodulation device without changing the transmission device of the reception device. There is an effect that the failure can be discriminated and the working line can be switched to the protection line.
第１図は本発明の一実施例によるデジタル無線通信シス
テムの構成を示すブロック図、第２図は従来のデジタル
無線通信システムの構成を示すブロック図である。 １……分岐回路、2A,2S……送信符号変換回路、3A,3S…
…送信符号処理回路、4A,4S……障害検出回路、５……
パイロット発生回路、６……送信切替器、7A,7S……デ
ータ反転回路、8A,8S……フレーム同期回路、9A,9S……
受信信号処理回路、10……分配回路10、11……同期切替
回路、12A,12S……受信符号変換回路、13……切替器、1
4……パイロット検出回路。FIG. 1 is a block diagram showing a configuration of a digital wireless communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a conventional digital wireless communication system. 1 ... Branch circuit, 2A, 2S ... Transmission code conversion circuit, 3A, 3S ...
… Transmission code processing circuit, 4A, 4S …… Fault detection circuit, 5 ……
Pilot generator circuit, 6 …… Transmission switch, 7A, 7S …… Data inversion circuit, 8A, 8S …… Frame synchronization circuit, 9A, 9S ……
Received signal processing circuit, 10 ... Distribution circuit 10, 11 ... Synchronous switching circuit, 12A, 12S ... Received code conversion circuit, 13 ... Switching device, 1
4 ... Pilot detection circuit.
Claims (1)
接続され、前記送信装置は、前記受信装置へ前記無線回
線を介してデジタル送信信号を送信し、前記受信装置は
前記デジタル送信信号をデジタル受信信号として受信す
るデジタル無線通信システムに於いて、前記送信装置
は、当該送信装置に障害が発生した場合、前記デジタル
送信信号を反転した信号を障害通知信号として前記受信
装置へ送信する手段を有し、前記受信装置は、前記デジ
タル受信信号として前記障害通知信号を受信してフレー
ム同期がとれないときに、前記送信装置で障害が発生し
たと見なすことを特徴とするデジタル無線通信システ
ム。1. A transmission device and a reception device are connected via a wireless line, the transmission device transmits a digital transmission signal to the reception device via the wireless line, and the reception device has the digital transmission signal. In a digital wireless communication system for receiving as a digital reception signal, the transmitting device transmits a signal obtained by inverting the digital transmission signal to the receiving device as a fault notification signal when a fault occurs in the transmitting device. In the digital wireless communication system, the receiving apparatus considers that a failure has occurred in the transmitting apparatus when the failure notification signal is received as the digital reception signal and frame synchronization cannot be achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1279847A JPH0775341B2 (en) | 1989-10-30 | 1989-10-30 | Digital wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1279847A JPH0775341B2 (en) | 1989-10-30 | 1989-10-30 | Digital wireless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03143131A JPH03143131A (en) | 1991-06-18 |
| JPH0775341B2 true JPH0775341B2 (en) | 1995-08-09 |
Family
ID=17616766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1279847A Expired - Fee Related JPH0775341B2 (en) | 1989-10-30 | 1989-10-30 | Digital wireless communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0775341B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5440163B2 (en) * | 1974-06-27 | 1979-12-01 | ||
| JPS62149233A (en) * | 1985-12-24 | 1987-07-03 | Toshiba Corp | Loop network |
-
1989
- 1989-10-30 JP JP1279847A patent/JPH0775341B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03143131A (en) | 1991-06-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |