JPS6161738B2 - - Google Patents
Info
- Publication number
- JPS6161738B2 JPS6161738B2 JP19181581A JP19181581A JPS6161738B2 JP S6161738 B2 JPS6161738 B2 JP S6161738B2 JP 19181581 A JP19181581 A JP 19181581A JP 19181581 A JP19181581 A JP 19181581A JP S6161738 B2 JPS6161738 B2 JP S6161738B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pilot signal
- phase
- amplifier
- output
- 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
Links
- 239000013598 vector Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は送信アンテナから空間を介して受信ア
ンテナへ廻り込む干渉電波を軽減する装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a device for reducing interference radio waves that circulate from a transmitting antenna to a receiving antenna through space.
（背景技術）
無線信号を受信アンテナで受信しこれを増幅後
送信アンテナより同一周波数にて再送信する無線
中継方式においては、送信アンテナから発射され
た信号の一部が空間を介した廻り込み電波として
受信アンテナに於いて再受信される場合がある。
このような場合に、受信アンテナに於いては、正
規の到来電波による信号と廻り込み電波による干
渉信号とが相加される為、中継装置の機能を阻害
する要因となり得る。従来、この干渉信号を補償
する方法としては、図１に示すように、振幅・位
相を調整できる帰還回路を中継装置の送信端から
受信端の間に設け、その帰還信号を干渉信号と逆
相・等振幅にすることにより干渉信号を相殺する
方法がある。図中、１は受信アンテナ、２は送信
アンテナ、３は中継増幅器、５は半固定移相器、
６は半固定減衰器、そして４は干渉補償のための
帰還ループである。帰還ループ４からの帰還信号
が干渉信号を相殺する条件である逆相・等振幅の
条件の設定は半固定移相器５と半固定減衰器６の
調整により行われる。通常この調整は測定器を用
いて手動で行われる為、極めて不便である。ま
た、一度調整が良好になされても、増幅器特性
や、送受アンテナ間伝搬路特性の変動により干渉
信号と帰還信号との相殺状態が劣化するため、定
常的に良好な補償特性の得られない欠点があつ
た。(Background technology) In a wireless relay system in which a radio signal is received by a receiving antenna and then retransmitted at the same frequency from a transmitting antenna after being amplified, a part of the signal emitted from the transmitting antenna is transmitted through space as a wraparound radio wave. The signal may be re-received by the receiving antenna.
In such a case, at the receiving antenna, the signal due to the regular incoming radio wave and the interference signal due to the detouring radio wave are added, which may become a factor that inhibits the function of the relay device. Conventionally, as shown in Figure 1, the method of compensating for this interference signal has been to provide a feedback circuit that can adjust the amplitude and phase between the transmitting end and the receiving end of the repeater, and to send the feedback signal to the opposite phase of the interfering signal.・There is a method to cancel the interference signal by making the amplitude equal. In the figure, 1 is a receiving antenna, 2 is a transmitting antenna, 3 is a relay amplifier, 5 is a semi-fixed phase shifter,
6 is a semi-fixed attenuator, and 4 is a feedback loop for interference compensation. The conditions of opposite phase and equal amplitude under which the feedback signal from the feedback loop 4 cancels out the interference signal are set by adjusting the semi-fixed phase shifter 5 and the semi-fixed attenuator 6. This adjustment is usually performed manually using a measuring instrument, which is extremely inconvenient. In addition, even if the adjustment is made well, the cancellation state between the interference signal and the feedback signal deteriorates due to variations in the amplifier characteristics and the propagation path characteristics between the transmitting and receiving antennas, making it impossible to consistently obtain good compensation characteristics. It was hot.
（技術的課題）
本発明はこれらの欠点を解消するため、送信信
号にパイロツト信号を重畳し、そのパイロツト信
号について帰還ループ信号と干渉信号との相殺残
留成分を検出することにより帰還ループ信号の振
幅と位相を制御し自動的に最適補償条件を実現し
ようとしたもので以下図面について詳細に説明す
る。(Technical Problem) In order to solve these drawbacks, the present invention superimposes a pilot signal on the transmission signal, and detects the residual component of the pilot signal that cancels the feedback loop signal and the interference signal, thereby increasing the amplitude of the feedback loop signal. This is an attempt to automatically realize the optimal compensation conditions by controlling the phase and phase, and the drawings will be explained in detail below.
（実施例）
第２図は本発明の実施例であつて、１は受信ア
ンテナ、２は送信アンテナ、３は中継増幅器、４
は帰還ループ、７は等振幅２相（０゜、90゜）分
配器、８は等振幅４相（０゜、90゜、180゜、270
゜）分配器、９はパイロツト信号発生器、１０は
パイロツト信号除出波器、１２と１３は信号帯
域通過波器、１４はレベル調整のための増幅
器、１５ａと１５ｂは同期検波器、１６ａと１６
ｂは電圧加算器、１７は整流器、１８は電気的可
変減衰器、１９ａ，１９ｂは可変遅延線路であ
る。(Embodiment) FIG. 2 shows an embodiment of the present invention, in which 1 is a receiving antenna, 2 is a transmitting antenna, 3 is a relay amplifier, and 4 is a transmitting antenna.
is a feedback loop, 7 is an equal amplitude 2-phase (0°, 90°) distributor, 8 is an equal amplitude 4-phase (0°, 90°, 180°, 270°)
゜) Divider, 9 is a pilot signal generator, 10 is a pilot signal remover, 12 and 13 are signal band pass filters, 14 is an amplifier for level adjustment, 15a and 15b are synchronous detectors, 16a and 16
b is a voltage adder, 17 is a rectifier, 18 is an electrical variable attenuator, and 19a and 19b are variable delay lines.
受信アンテナ１で受信される信号は、正規の到
来電波による信号（以下正規信号という）と、送
信アンテナ２から発射後空間を介して廻り込む干
渉信号の合成されたものである。中継増幅器の入
力信号はこれらにさらに帰還ループ４を経由した
帰還信号が相加されている。さて、本発明は干渉
信号と帰還信号の相殺条件を自動的に実現するも
のでその動作は次のとおりである。いま、送信ア
ンテナ２から単一周波数のパイロツト信号が発射
されている状態を考える。このとき、パイロツト
信号検出波器１１の出力信号は干渉信号と帰還
信号との合成信号であつて、これを第３図のベク
トル図にｅ〓sで示す。ここで同図中ｅ〓i，ｅ〓cはそ
れ
ぞれ干渉信号および帰還信号を表わす。この抽出
されたパイロツト信号ｅ〓sをパイロツト信号発生
器９から分岐した信号の同相および直交成分を基
準として同期検波器１５ａおよび１５ｂで同期検
波すれば、ベクトルｅ〓sの同相および直交成分ｅ
x，ｅyが直流電圧として検出できる。そこで、こ
のｅx，ｅyの符号を反転したスペクトル−ｅ〓sを
さらにｅ〓sに相加すれば、パイロツト検出波器
１１の出力は消失し、干渉信号と帰還信号の相殺
条件が実現できる。これは具体的には次のように
して実現される。まず同期検波器１５ａ，１５ｂ
で検出された同相成分ｅxと直交成分ｅyはそれぞ
れ電圧加算器１６ａおよび１６ｂに入力され、そ
の出力で等振幅４相分配器８と電気的可変減衰器
１８とで構成されるベクトル変調器を駆動する。
ここでダイオード１７は電圧加算器の出力電圧の
極性に応じてベクトル変調器のｘ軸、ｙ軸の極性
を選択するもので、例えばｅxが正ならばπ相の
信号経路が導通となる。そして、その導通信号の
レベルは検出電圧の大きさ、例えば｜ｅx｜にな
るように電気的可変減衰器により設定される。こ
のようにして、同期検波器１５ａ，１５ｂで検出
された電圧に対してベクトル変調器での制御を負
帰還状態にすることが可能である。例えば、第３
図のベクトル図に示すように、受信信号中のパイ
ロツト信号成分の同相成分としてｅx、そして直
交成分としてｅyが検出された場合、ベクトル変
調器は、帰還ループの出力信号がそれまでの出力
信号ｅ〓cにさらに−ｅxｉ−ｅyｊ（但し、ｉ、ｊ
はそれぞれ第３図ｘ軸、ｙ軸の単位ベクトル）、
すなわち、−ｅ〓sの相加された信号となる。従つ
て、この制御により受信信号中のパイロツト信号
の抑圧が実現される。これは、すなわち帰還信号
により干渉信号が相殺される条件に一致するの
で、本発明をアンテナ送受間干渉の自動補償装置
に応用できる。この際、パイロツト信号除去波
器１０は、主信号経路のパイロツト信号成分を除
去するもので、これにより、(i)残留パイロツト成
分が出力側に現れず制御が多重ループ化すること
を防止でき、又(ii)中継増幅器の特性変動がパイロ
ツトレベル及び位相に影響しないなどの効果を生
じ、制御を極めて安定化することができる。ま
た、加算される制御電圧の−ｅ〓sに対する近似性
はより良い方が収束を早めるので望ましいが、近
似性が良好でなくとも、制御は負帰還となつてい
るので収束し、干渉信号の抑圧は可能である。な
お、同期検波器の基準信号ならびに入力信号とベ
クトル変調器の出力信号との位相同期は、それぞ
れ可変遅延線路１９ａ，１９ｂの調整により行な
い、またパイロツト除去波器１０は、パイロツ
ト信号が信号帯域通過波器１２で除去可能なと
きには不要である。 The signal received by the receiving antenna 1 is a combination of a signal due to a regular arriving radio wave (hereinafter referred to as a regular signal) and an interference signal that circulates through space after being emitted from the transmitting antenna 2. A feedback signal via a feedback loop 4 is further added to the input signals of the relay amplifier. Now, the present invention automatically realizes the conditions for canceling the interference signal and the feedback signal, and its operation is as follows. Now, consider a situation where a pilot signal of a single frequency is being emitted from the transmitting antenna 2. At this time, the output signal of the pilot signal detector 11 is a composite signal of the interference signal and the feedback signal, which is shown as e s in the vector diagram of FIG. Here, e〓 i and e〓 c in the figure represent an interference signal and a feedback signal, respectively. If this extracted pilot signal e〓 s is synchronously detected by the synchronous detectors 15a and 15b with reference to the in-phase and quadrature components of the signal branched from the pilot signal generator 9, the in-phase and quadrature components e of the vector e〓 s are detected.
x , e y can be detected as DC voltage. Therefore, if the spectrum - e s , which is the sign-inverted spectrum of e can. Specifically, this is achieved as follows. First, the synchronous detectors 15a and 15b
The in-phase component e x and quadrature component e y detected in are input to voltage adders 16a and 16b, respectively, and their outputs are used as vector modulators consisting of an equal-amplitude four-phase divider 8 and an electrical variable attenuator 18. to drive.
Here, the diode 17 selects the polarity of the x-axis and y-axis of the vector modulator according to the polarity of the output voltage of the voltage adder. For example, if e x is positive, the π-phase signal path becomes conductive. Then, the level of the conductive signal is set by an electrically variable attenuator so as to be equal to the magnitude of the detected voltage, for example | ex |. In this way, it is possible to bring the control of the vector modulator into a negative feedback state for the voltages detected by the synchronous detectors 15a and 15b. For example, the third
As shown in the vector diagram, when e In addition to the signal e〓 c , −e x i−e y j (however, i, j
are the unit vectors of the x-axis and y-axis in Figure 3, respectively),
That is, the signal is an added signal of -e〓s . Therefore, this control realizes suppression of the pilot signal in the received signal. Since this corresponds to the condition that the interference signal is canceled by the feedback signal, the present invention can be applied to an automatic compensation device for interference between transmitting and receiving antennas. At this time, the pilot signal remover 10 removes the pilot signal component from the main signal path, thereby (i) preventing the residual pilot component from appearing on the output side and causing multiple loops of control; Furthermore, (ii) variations in the characteristics of the relay amplifier do not affect the pilot level and phase, resulting in extremely stable control. In addition, it is desirable that the approximation of the added control voltage to -e〓 s is better because convergence will be faster, but even if the approximation is not good, since the control is negative feedback, it will converge and the interference signal will be reduced. Repression is possible. The phase synchronization between the reference signal and input signal of the synchronous detector and the output signal of the vector modulator is performed by adjusting the variable delay lines 19a and 19b, respectively, and the pilot remover 10 allows the pilot signal to pass through the signal band. It is not necessary when it can be removed by the wave generator 12.
（発明の効果）
以上説明したように、本発明を用いることによ
り、アンテナ受信信号において干渉信号をアンテ
ナ送受間伝搬路および中継増幅器の特性変動と無
関係に自動的に低減することが可能となるから、
送受信信号周波数が同一である無線中継方式にお
いて送受アンテナ間の干渉信号を補償することが
でき、中継装置の増幅利得として送受アンテナ間
結合減衰量（干渉補償を用いない場合の値）以上
のものを配分できる利点がある。(Effects of the Invention) As explained above, by using the present invention, it is possible to automatically reduce interference signals in the antenna reception signal regardless of the characteristic fluctuations of the propagation path between the antenna transmission and reception and the repeater amplifier. ,
In a wireless relay system where the transmitting and receiving signal frequencies are the same, it is possible to compensate for interference signals between the transmitting and receiving antennas, and the amplification gain of the relay device is greater than the coupling attenuation between the transmitting and receiving antennas (the value when no interference compensation is used). There are benefits that can be distributed.
第１図は従来の干渉補装置の一実施例、第２図
は本発明の一実施例、第３図は受信パイロツト信
号のベクトル図である。
１……受信アンテナ、２……送信アンテナ、３
……中継増幅器、４……帰還ループ、５……半固
定移相器、６……半固定減衰器、７……等振幅２
相分配器、８……等振幅４相分配器、９……パイ
ロツト信号発生器、１０……パイロツト信号除去
波器、１１……パイロツト信号検出波器、１
２，１３……信号帯域通過波器、１４……増幅
器、１５ａ，１５ｂ……同期検波器、１６ａ，１
６ｂ……電圧加算器、１７……ダイオード、１８
……電気的可変減衰器、１９ａ，１９ｂ……可変
遅延線路、２０……抽出されたパイロツト信号ベ
クトル、２１……干渉信号ベクトル、２２……帰
還信号ベクトル、２３……パイロツト信号の逆ベ
クトル、２４……パイロツト信号ベクトルのｘ成
分（同相成分）、２５……パイロツト信号ベクト
ルのｙ成分（直交成分）。
FIG. 1 is an embodiment of a conventional interference compensator, FIG. 2 is an embodiment of the present invention, and FIG. 3 is a vector diagram of a received pilot signal. 1... Receiving antenna, 2... Transmitting antenna, 3
... Relay amplifier, 4 ... Feedback loop, 5 ... Semi-fixed phase shifter, 6 ... Semi-fixed attenuator, 7 ... Equal amplitude 2
Phase divider, 8... Equal amplitude 4-phase divider, 9... Pilot signal generator, 10... Pilot signal remover, 11... Pilot signal detector, 1
2, 13... Signal band pass wave generator, 14... Amplifier, 15a, 15b... Synchronous detector, 16a, 1
6b... Voltage adder, 17... Diode, 18
...electrical variable attenuator, 19a, 19b...variable delay line, 20...extracted pilot signal vector, 21...interference signal vector, 22...feedback signal vector, 23...inverse vector of pilot signal, 24...x component (in-phase component) of the pilot signal vector, 25... y component (orthogonal component) of the pilot signal vector.
Claims (1)
増幅し、受信信号と同一周波数で送信アンテナか
ら再送信する無線中継装置において、 前記増幅器の出力部で送信信号に特定周波数の
パイロツト信号を重畳する手段と、 該パイロツト信号を重畳した送信信号の一部を
分岐して、等振幅４相分配器と各々の分配経路に
接続される可変減衰器とから成り各可変減衰器の
出力を同相で合成して出力するベクトル変調器に
印加する手段と、 前記ベクトル変調器の出力を可変遅延手段を介
して当該無線中継装置の入力部に帰還して受信信
号に重畳する手段と、 受信信号からパイロツト信号を抽出する手段
と、 抽出したパイロツト信号の同相成分と直交成分
を検出してそれらにより前記ベクトル変調器の可
変減衰器の減衰量を調整する手段と、 パイロツト信号抽出後の受信信号からパイロツ
ト信号を除去して前記増幅器に印加するフイルタ
手段とを具備し、 送信アンテナより空間を介して受信アンテナに
帰還する干渉信号を低減させることを特徴とする
干渉波補償装置。[Claims] 1. In a radio relay device that receives a radio signal with a receiving antenna, amplifies it with an amplifier, and retransmits it from the transmitting antenna at the same frequency as the received signal, the output section of the amplifier adds a specific frequency to the transmitted signal. It consists of a means for superimposing a pilot signal, a part of the transmission signal on which the pilot signal is superimposed, and an equal amplitude four-phase distributor and a variable attenuator connected to each distribution path. means for applying the output to a vector modulator that combines and outputs the output in the same phase; means for returning the output of the vector modulator to the input section of the wireless relay device via a variable delay means and superimposing it on the received signal; means for extracting a pilot signal from a received signal; means for detecting in-phase and quadrature components of the extracted pilot signal and adjusting the attenuation amount of the variable attenuator of the vector modulator therefrom; and receiving after extracting the pilot signal. An interference wave compensator comprising filter means for removing a pilot signal from a signal and applying it to the amplifier, thereby reducing an interference signal that returns from a transmitting antenna to a receiving antenna via space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19181581A JPS5895435A (en) | 1981-12-01 | 1981-12-01 | Compensating device for interference wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19181581A JPS5895435A (en) | 1981-12-01 | 1981-12-01 | Compensating device for interference wave |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5895435A JPS5895435A (en) | 1983-06-07 |
| JPS6161738B2 true JPS6161738B2 (en) | 1986-12-26 |
Family
ID=16280979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19181581A Granted JPS5895435A (en) | 1981-12-01 | 1981-12-01 | Compensating device for interference wave |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5895435A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58204637A (en) * | 1982-05-24 | 1983-11-29 | Nippon Telegr & Teleph Corp <Ntt> | System for compensating interference wave |
| JP2713161B2 (en) * | 1994-04-22 | 1998-02-16 | 日本電気株式会社 | Wireless communication system |
-
1981
- 1981-12-01 JP JP19181581A patent/JPS5895435A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5895435A (en) | 1983-06-07 |
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