JPH0746783B2 - Interference signal elimination method - Google Patents
Interference signal elimination methodInfo
- Publication number
- JPH0746783B2 JPH0746783B2 JP60207066A JP20706685A JPH0746783B2 JP H0746783 B2 JPH0746783 B2 JP H0746783B2 JP 60207066 A JP60207066 A JP 60207066A JP 20706685 A JP20706685 A JP 20706685A JP H0746783 B2 JPH0746783 B2 JP H0746783B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission
- interference
- reception
- frequency characteristic
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15585—Relay station antennae loop interference reduction by interference cancellation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は干渉信号除去方式に関し、特に、送受同一周波
数無線通信回線における送受信装置に適用される干渉信
号除去方式の改良に関する。Description: TECHNICAL FIELD The present invention relates to an interference signal canceling method, and more particularly to improvement of an interference signal canceling method applied to a transmitting / receiving apparatus in a transmission / reception same frequency wireless communication line.
最近、使用周波数の有効利用を目的として、送受同一周
波数無線通信方式による通信回線が提案されている。こ
の送受同一周波数無線通信回線における送受信装置また
は中継装置等においては、送信周波数ならびに受信周波
数が同一であるために、送信信号の受信信号に対する漏
れ込みによる干渉信号が、回線品質の劣化要因の一つと
なっている、この干渉信号を除去するために、一例とし
て、第２図に示される干渉信号方式が提案されている。Recently, a communication line based on a transmission / reception same frequency wireless communication system has been proposed for the purpose of effectively using the used frequency. In this transmission / reception same-frequency wireless communication line, the transmission / reception device or the relay device has the same transmission frequency and reception frequency. Therefore, the interference signal due to leakage of the transmission signal into the reception signal is one of the causes of deterioration of the line quality. In order to eliminate this interference signal, the interference signal system shown in FIG. 2 has been proposed as an example.
第２図は、上記の干渉信号除去方式が適用される送受信
装置の一例を示すブロック図で、変調器13と、可変周波
数特性フイルタ14および加算回路22を含む干渉信号除去
装置と、送信器15と、局部発振器16と、ブランチ回路1
7,20と、送信アンテナ18と、受信アンテナ19と、受信器
21と、復調器23とを備えている。第２図において、端子
53より所定の変調入力信号111が変調器13および可変周
波数特性フイルタ14に入力される。変調器13からは中間
周波数帯の被変調波信号112が出力されるが、一方は、
送信器15、ブランチ回路17および送信アンテナ18を経由
して、送信信号114として対向局に送出され、他方は可
変周波数特性フイルタ14に入力される。対向局から送ら
れてくる受信信号115は、受信アンテナ19、ブランチ回
路20および受信器21を経由して、中間周波数帯の受信信
号116として加算回路22に入力される。なお、局部発振
器16は、送信器15および受信器21に対して共通の局部発
振信号113を供給しており、それぞれにおける周波数変
換作用に寄与している。送信信号114と受信信号115とは
同一の搬送波周波数が用いられているため、中間周波数
帯の受信信号116には、送信信号114を含む送信信号から
の漏れ込みによる干渉信号が介入している。受信信号11
6は加算回路22に入力され、可変周波数特性フイルタ14
より送られてくる干渉消去信号117と加算されて、前記
干渉信号が除去される。加算回路22から出力される受信
信号118は、復調器23に入力されて復調され復調出力信
号119として出力されるとともに、誤差信号120も出力さ
れる。FIG. 2 is a block diagram showing an example of a transmitting / receiving apparatus to which the above-mentioned interference signal canceling method is applied. The modulator 13, the interference signal canceling apparatus including the variable frequency characteristic filter 14 and the adding circuit 22, and the transmitter 15 are shown. , Local oscillator 16 and branch circuit 1
7,20, transmitting antenna 18, receiving antenna 19 and receiver
21 and a demodulator 23. In FIG. 2, terminals
A predetermined modulation input signal 111 is input to the modulator 13 and the variable frequency characteristic filter 14 from 53. The modulated wave signal 112 in the intermediate frequency band is output from the modulator 13, one of which is
It is sent to the opposite station as a transmission signal 114 via the transmitter 15, the branch circuit 17 and the transmission antenna 18, and the other is input to the variable frequency characteristic filter 14. The reception signal 115 sent from the opposite station is input to the adding circuit 22 as a reception signal 116 in the intermediate frequency band via the reception antenna 19, the branch circuit 20 and the receiver 21. The local oscillator 16 supplies a common local oscillation signal 113 to the transmitter 15 and the receiver 21, and contributes to the frequency conversion action in each. Since the same carrier frequency is used for the transmission signal 114 and the reception signal 115, the interference signal due to leakage from the transmission signal including the transmission signal 114 intervenes in the reception signal 116 in the intermediate frequency band. Received signal 11
6 is input to the adder circuit 22 and the variable frequency characteristic filter 14
The interference cancellation signal 117 is added to the interference cancellation signal 117 to remove the interference signal. The reception signal 118 output from the adder circuit 22 is input to the demodulator 23, demodulated and output as the demodulation output signal 119, and the error signal 120 is also output.
可変周波数特性フイルタ14は、第３図に示されるよう
に、一例として相関検出器24およびトランスバーサル・
フイルタ25を備えており、前述の変調入力信号111およ
び誤差信号120は、相関検出器24に入力されて、変調入
力信号111を基準とする誤差信号が検出される。この誤
差信号は、受信信号118に重畳されている干渉信号の残
留分に対応しており、相関検出器24からは、前記誤差信
号を最小とするように作用する複数の制御信号121が出
力されて、トランスバーサル・フイルタ25の対応する各
タップの重み付け回路に入力される。トランスバーサル
・フイルタ25には、中間周波数帯の被変調波信号112が
入力されており、上述の複数の制御信号121による各タ
ップの重み付け回路に対する制御作用を介して、前述の
干渉消去信号117が出力される。この干渉消去信号117と
受信信号116とが加算回路22において加算され、受信信
号に重畳されている干渉信号が除去されることは前述し
たとおりである。As shown in FIG. 3, the variable frequency characteristic filter 14 includes a correlation detector 24 and a transversal filter, as an example.
The filter 25 is provided, and the modulation input signal 111 and the error signal 120 described above are input to the correlation detector 24, and an error signal based on the modulation input signal 111 is detected. This error signal corresponds to the residual component of the interference signal superimposed on the received signal 118, and the correlation detector 24 outputs a plurality of control signals 121 which act to minimize the error signal. Are input to the weighting circuit of each corresponding tap of the transversal filter 25. The transversal filter 25 is supplied with the modulated wave signal 112 in the intermediate frequency band, and the interference canceling signal 117 described above is passed through the control action for the weighting circuit of each tap by the above-mentioned plurality of control signals 121. Is output. As described above, the interference cancellation signal 117 and the reception signal 116 are added in the adding circuit 22 to remove the interference signal superimposed on the reception signal.
上記の干渉信号除去方式においては、受信系に漏れ込ん
でいる干渉信号を除去するために、中間周波数帯の受信
信号に対応して、送信系の変調器より出力される中間周
波数帯の被変調波信号の可変周波数特性フイルタ出力を
もって干渉消去信号としている。しかしながら、一般に
送信信号の受信号に対する漏れ込みは、送信系における
前記変調器の出力点より起算して、送受信装置固有の固
定周波数特性条件の下に干渉信号として介在しており、
従って、前記可変周波数特性フイルタの所要機能として
は、本来対応すべき可変的干渉ルートに対する所要機能
に加えて、前記固定周波数特性条件に対しても補正機能
を求められることとなり、可変周波数特性フイルタの前
記本来の補正機能が損われるという欠点がある。In the above interference signal elimination method, in order to remove the interference signal leaking into the receiving system, the modulated signal in the intermediate frequency band output from the modulator in the transmitting system is output corresponding to the received signal in the intermediate frequency band. The interference cancellation signal is obtained by using the variable frequency characteristic filter output of the wave signal. However, in general, the leakage of the transmission signal with respect to the reception signal is calculated from the output point of the modulator in the transmission system, and intervenes as an interference signal under the fixed frequency characteristic condition peculiar to the transmission / reception device,
Therefore, as the required function of the variable frequency characteristic filter, in addition to the required function for the variable interference route which should be originally supported, the correction function is required also for the fixed frequency characteristic condition. There is a drawback that the original correction function is impaired.
本発明の干渉信号除去方式は、送受同一周波数無線通信
回線における送受信装置において、送信信号の受信信号
に対する漏れ込みによる干渉信号を、送信系における被
変調波信号を所定の可変周波数特性を有する信号波形修
正手段を介して干渉消去信号として受信系に導入するこ
とにより除去する干渉信号除去方式において、送信系に
おける前記被変調波信号の抽出点より、受信系における
前記干渉消去信号の導入点に至るまでの、前記漏れ込み
による干渉信号の伝送径路に対応する固定周波数特性を
有する信号波形修正手段またはその一部を、前記可変周
波数特性を有する信号波形修正手段に縦続接続する形で
備えている。The interference signal elimination method of the present invention is a signal waveform having a predetermined variable frequency characteristic for an interference signal due to a leak of a transmission signal with respect to a reception signal and a modulated wave signal in a transmission system in a transmitter / receiver in a transmission / reception same frequency wireless communication line. In an interference signal elimination method of removing by introducing as an interference cancellation signal into a reception system via a correction means, from the extraction point of the modulated wave signal in the transmission system to the introduction point of the interference cancellation signal in the reception system. The signal waveform modifying means having a fixed frequency characteristic corresponding to the transmission path of the interference signal due to the leakage or a part thereof is provided in a form of cascade connection with the signal waveform modifying means having the variable frequency characteristic.
以下、本発明について図面を参照して説明する。 Hereinafter, the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例における送受信装置の要部
を示すブロック図である。第１図に示されるように、本
実施例における送受信装置は、変調器１と、固定フイル
タ２と、可変周波数特性フイルタ３と、送信器４と、局
部発振器５と、ブランチ回路6,9と、送信アンテナ７
と、受信アンテナ８と、受信器10と、加算回路11と、復
調器12とを備えている。FIG. 1 is a block diagram showing a main part of a transmission / reception device according to an embodiment of the present invention. As shown in FIG. 1, the transmitter / receiver according to the present embodiment includes a modulator 1, a fixed filter 2, a variable frequency characteristic filter 3, a transmitter 4, a local oscillator 5, branch circuits 6 and 9. , Transmitting antenna 7
And a receiving antenna 8, a receiver 10, an adder circuit 11, and a demodulator 12.
第１図において、端子51から所定の変調入力信号101は
変調器１に入力され、送信器４、ブランチ回路６および
送信アンテナ７を経由して、送信信号105として対向局
に送出される。また、対向局から送られてくる受信信号
106は、受信アンテナ８、ブランチ回路９、受信器10、
加算回路11および復調器12を経由して、復調出力信号11
0として端子52を介して出力される。この送受信作用に
関連する、固定フイルタ２および可変周波数特性フイル
タ３を含む各構成回路要素の一般作用については、第２
図に示される前例の場合と同様である。しかしながら、
本発明の前例と異なる点は、可変周波数特性フイルタ３
に対して固定フイルタ２が縦続接続されていることにあ
る。固定フイルタ２は、送信系における変調器１の出力
点より起算して、送信信号が受信信号に漏れ込んで干渉
信号が形成され、中間周波数帯の受信信号107に重畳さ
れて加算回路11に入力されるまでの、送受信装置固有の
固定周波数特性に対応する特性を有するように構成され
ており、従って、固定フイルタ２に縦続接続される可変
周波数特性フイルタ３としては、前記送受信装置固有の
固定周波数特性に対応する補正機能は一切不要となり、
本来の、送信信号が受信信号に漏れ込んで干渉信号を形
成する過程における、変動要素をともなう可変的な干渉
ルートに対応する補正機能のみが求められることとな
る。この結果、可変周波数特性フイルタ３の可変干渉ル
ートに対する補正機能は十分に確保され、加算回路11に
おいて前記干渉信号は適確に除去される。なお、上記の
説明においては、送受信装置固有の固定周波数特性に対
しては、すべて固定フイルタ２により対応する場合につ
き説明したが、可変周波数特性フイルタ３の構成の仕方
によっては、固定フイルタ２の特性の一部を可変周波数
特性フイルタ３に含めてもよい。In FIG. 1, a predetermined modulation input signal 101 is input from the terminal 51 to the modulator 1, and is sent to the opposite station as a transmission signal 105 via the transmitter 4, the branch circuit 6 and the transmission antenna 7. In addition, the received signal sent from the opposite station
106 is a receiving antenna 8, a branch circuit 9, a receiver 10,
Demodulated output signal 11 via addition circuit 11 and demodulator 12
It is output as 0 through the terminal 52. The general operation of each constituent circuit element including the fixed filter 2 and the variable frequency characteristic filter 3 related to the transmitting / receiving operation will be described in the second section.
This is similar to the case of the previous example shown in the figure. However,
The difference from the previous example of the present invention is that the variable frequency characteristic filter 3
On the other hand, the fixed filter 2 is connected in cascade. The fixed filter 2 is calculated from the output point of the modulator 1 in the transmission system, and the transmission signal leaks into the reception signal to form an interference signal, which is superimposed on the reception signal 107 in the intermediate frequency band and input to the adder circuit 11. The variable frequency characteristic filter 3 cascade-connected to the fixed filter 2 has a fixed frequency characteristic of the transmission / reception apparatus. The correction function corresponding to the characteristics is no longer necessary,
Only the correction function corresponding to the variable interference route with the variable element in the original process in which the transmission signal leaks into the reception signal to form the interference signal is required. As a result, the function of correcting the variable interference route of the variable frequency characteristic filter 3 is sufficiently ensured, and the adder circuit 11 appropriately removes the interference signal. In the above description, the fixed frequency characteristic peculiar to the transmitter / receiver is described as being handled by the fixed filter 2. However, depending on how the variable frequency characteristic filter 3 is configured, the characteristic of the fixed filter 2 may be changed. May be included in the variable frequency characteristic filter 3.
以上説明したように、本発明は、送受同一周波数無線通
信回線における送受信装置に適用されて、送信信号の受
信信号に対する漏れ込みによる干渉信号除去を目的とす
る可変周波数特性フイルタの補正機能を改善し、前記干
渉信号の除去を確実にして前記送受同一周波数無線通信
回線の回線品質を向上させることができるという効果が
ある。As described above, the present invention is applied to a transmitter / receiver in a transmission / reception same-frequency wireless communication line to improve the correction function of a variable frequency characteristic filter for removing an interference signal due to leakage of a transmission signal into a reception signal. There is an effect that the interference signal can be reliably removed and the line quality of the transmission / reception same-frequency wireless communication line can be improved.
第１図は本発明の一実施例における送受信装置の要部を
示すブロック図、第２図は従来例における送受信装置の
要部を示すブロック図、第３図は可変周波数特性フイル
タを含む部分ブロック図である。 図において、1,13……変調器、２……固定フイルタ、3,
14……可変周波数特性フイルタ、4,15……送信器、5,16
……局部発振器、6,9,17,20……ブランチ回路、7,18…
…送信アンテナ、8,19……受信アンテナ、10,21……受
信器、11,22……加算回路、12,23……復調器、24……相
関検出器、25……トランスバーサル・フイルタ。FIG. 1 is a block diagram showing a main part of a transmitter / receiver in an embodiment of the present invention, FIG. 2 is a block diagram showing a main part of a transmitter / receiver in a conventional example, and FIG. 3 is a partial block including a variable frequency characteristic filter. It is a figure. In the figure, 1, 13 ... Modulator, 2 ... Fixed filter, 3,
14 …… Variable frequency characteristic filter, 4,15 …… Transmitter, 5,16
...... Local oscillator, 6,9,17,20 …… Branch circuit, 7,18…
… Transmit antenna, 8,19 …… Receive antenna, 10,21 …… Receiver, 11,22 …… Adding circuit, 12,23 …… Demodulator, 24 …… Correlation detector, 25 …… Transversal filter .
Claims (1)
信装置において、送信信号の受信信号に対する漏れ込み
による干渉信号を、送信系における被変調波信号を所定
の可変周波数特性を有する信号波形修正手段を介して干
渉消去信号として受信系に導入することにより除去する
干渉信号除去方式において、 送信系における前記被変調波信号の抽出点より、受信系
における前記干渉消去信号の導入点に至るまでの、前記
漏れ込みによる干渉信号の伝送径路に対応する固定周波
数特性を有する信号波形修正手段またはその一部を、前
記可変周波数特性を有する信号波形修正手段に縦続接続
する形で備えることを特徴とする干渉信号除去方式。1. A transmission / reception device in a transmission / reception same frequency wireless communication line, wherein an interference signal due to a leak of a transmission signal with respect to a reception signal, a modulated wave signal in a transmission system is passed through a signal waveform correction means having a predetermined variable frequency characteristic. In the interference signal removal method of removing the interference cancellation signal by introducing it into the reception system as the interference cancellation signal, the leakage from the extraction point of the modulated wave signal in the transmission system to the introduction point of the interference cancellation signal in the reception system. Interference signal removal means characterized in that it is provided with a signal waveform modifying means having a fixed frequency characteristic corresponding to a transmission path of an interference signal due to congestion or a part thereof in cascade connection with the signal waveform modifying means having the variable frequency characteristic. method.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60207066A JPH0746783B2 (en) | 1985-09-18 | 1985-09-18 | Interference signal elimination method |
| CA000518349A CA1250022A (en) | 1985-09-18 | 1986-09-17 | One frequency repeater having interference cancellation capability in a digital radio system |
| DE8686112842T DE3681388D1 (en) | 1985-09-18 | 1986-09-17 | RADIO RELAY WITH ONLY ONE FREQUENCY FOR A DIGITAL RADIO SYSTEM. |
| AU62767/86A AU588176B2 (en) | 1985-09-18 | 1986-09-17 | One frequency repeater for a digital radio system |
| EP86112842A EP0215479B1 (en) | 1985-09-18 | 1986-09-17 | One frequency repeater for a digital radio system |
| US06/908,847 US4789993A (en) | 1985-09-18 | 1986-09-18 | One frequency repeater for a digital radio system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60207066A JPH0746783B2 (en) | 1985-09-18 | 1985-09-18 | Interference signal elimination method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6266723A JPS6266723A (en) | 1987-03-26 |
| JPH0746783B2 true JPH0746783B2 (en) | 1995-05-17 |
Family
ID=16533635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60207066A Expired - Lifetime JPH0746783B2 (en) | 1985-09-18 | 1985-09-18 | Interference signal elimination method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0746783B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2595751B2 (en) * | 1990-03-16 | 1997-04-02 | 日本電信電話株式会社 | Wireless transceiver |
| JP2957289B2 (en) * | 1991-02-04 | 1999-10-04 | 防衛庁技術研究本部長 | Transceiver |
| JP4545683B2 (en) * | 2005-12-08 | 2010-09-15 | 三菱電機株式会社 | Interference wave removing apparatus and interference wave removing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59225626A (en) * | 1983-06-06 | 1984-12-18 | Nippon Telegr & Teleph Corp <Ntt> | Echo canceller device for data transmitter |
-
1985
- 1985-09-18 JP JP60207066A patent/JPH0746783B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6266723A (en) | 1987-03-26 |
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