JPH0523652B2 - - Google Patents
Info
- Publication number
- JPH0523652B2 JPH0523652B2 JP21838085A JP21838085A JPH0523652B2 JP H0523652 B2 JPH0523652 B2 JP H0523652B2 JP 21838085 A JP21838085 A JP 21838085A JP 21838085 A JP21838085 A JP 21838085A JP H0523652 B2 JPH0523652 B2 JP H0523652B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- carrier wave
- phase
- carrier
- 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
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000010355 oscillation Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035559 beat frequency Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は同一周波数中継方式に関し、特に送受
同一の搬送波周波数を用いる無線通信回線におい
て、中継局において生起する周波数特性劣化を改
善する同一周波数中継方式に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a same frequency relay system, and in particular to a same frequency relay system that improves frequency characteristic deterioration occurring at a relay station in a wireless communication line that uses the same carrier frequency for transmission and reception. Regarding the method.
従来、中継局を介して形成されるマイクロ波帯
の無線通信回線においては、いわゆる２周波方式
が用いられており、同一局における送信と受信の
周波数は相互に異なる周波数が使用されている。
従つて、無線通信回線における各中継区間ごと
に、送受周波数が交互に入れ代わる形で周波数が
配置される。最近、使用周波数の有効利用という
観点から、上記の２周波方式の代りに、同一局に
おいて送受同一の周波数を使用する同一周波数無
線通信回線の適用が提案されている。第２図に示
されるのは、上記同一周波数無線通信回線におけ
る、中継局の一方向のルートに対応する中継シス
テムの主要部を示すブロツク図で、受信アンテナ
８と、受信器９と、受信信号の搬送波周波数を所
定の中間周波数に変換するための局部発振信号を
発生する局部発振器１０と、復調器１１と、変調
器１２と、搬送波発生回路１３と、送信器１４
と、送信信号の搬送波周波数を生成するための周
波数変換用の局部発振信号を発生する局部発振器
１５と、送信アンテナ１６とを備えている。
Conventionally, a so-called two-frequency system has been used in a microwave band wireless communication line formed through a relay station, in which different frequencies are used for transmission and reception at the same station.
Therefore, the frequencies are arranged in such a way that the transmission and reception frequencies are alternated for each relay section in the wireless communication line. Recently, from the viewpoint of effective use of frequencies, it has been proposed to apply a same frequency wireless communication line, in which the same frequency is used for transmission and reception at the same station, instead of the above-mentioned two-frequency system. What is shown in FIG. 2 is a block diagram showing the main parts of a relay system corresponding to a one-way route of a relay station in the same frequency wireless communication line, including a receiving antenna 8, a receiver 9, and a receiving signal. a local oscillator 10 that generates a local oscillation signal for converting a carrier frequency into a predetermined intermediate frequency, a demodulator 11, a modulator 12, a carrier generation circuit 13, and a transmitter 14.
, a local oscillator 15 that generates a local oscillation signal for frequency conversion to generate a carrier frequency of a transmission signal, and a transmission antenna 16.
第２図において、搬送波周波数がf1の受信信号
１０３は、受信アンテナ８を介して受信器９に入
力される。受信器９には周波数変換器および中間
周波数増幅器等が備えられており、局部発振器１
０から送られてくる局部発振信号により、受信信
号１０３は所定の中間周波数信号に変換され、前
記中間周波数増幅器により増幅されて復調器１１
に入力される。復調器１１は、例えばデイジタル
多相位相変調波またはデイジタル多値直交振幅変
調波等の入力に対応して、復調方式としては直交
位相同期検波方式を用いて構成されており、ま
た、受信信号に含まれている振幅歪ならびに位相
歪を除去するための等化回路等が備えられてい
る。 In FIG. 2, a received signal 103 with a carrier frequency f 1 is input to a receiver 9 via a receiving antenna 8. The receiver 9 is equipped with a frequency converter, an intermediate frequency amplifier, etc., and a local oscillator 1.
The received signal 103 is converted into a predetermined intermediate frequency signal by the local oscillation signal sent from 0, and is amplified by the intermediate frequency amplifier and sent to the demodulator 11.
is input. The demodulator 11 is configured to use a quadrature phase coherent detection method as a demodulation method in response to an input of, for example, a digital multiphase phase modulated wave or a digital multilevel quadrature amplitude modulated wave. An equalization circuit and the like are provided to remove the included amplitude distortion and phase distortion.
復調器１１において復調されて出力されるベー
スバンド信号は変調器１２に入力され、搬送波発
生回路１５より送られてくる搬送波信号に対する
前記ベースバンド信号による変調が行われる。変
調器１２から出力される被変波信号は送信器１４
に入力され、局部発振器１５から送られてくる局
部発振信号により、受信信号１０３の搬送波周波
数f1に等しい搬送波周波数の送信信号に変換さ
れ、電力増幅されて送信信号１０２として送信ア
ンテナ１６より対向局に送出される。この同一周
波数中継方式においては、送受信周波数が同一で
あるために自局の送信信号が受信信号に漏れ込ん
で干渉を生じるが、復調器１１に備えられている
等化回路により、前記干渉を除去することが対応
策として考慮されている。 The baseband signal demodulated and output by the demodulator 11 is input to the modulator 12, and the carrier signal sent from the carrier wave generation circuit 15 is modulated by the baseband signal. The modified wave signal output from the modulator 12 is sent to the transmitter 14
The signal is input to the oscillator, and is converted into a transmission signal with a carrier frequency equal to the carrier frequency f 1 of the reception signal 103 by the local oscillation signal sent from the local oscillator 15, power amplified, and sent as the transmission signal 102 from the transmission antenna 16 to the opposite station. sent to. In this same frequency relay system, since the transmitting and receiving frequencies are the same, the transmitted signal of the own station leaks into the received signal and causes interference, but the equalization circuit provided in the demodulator 11 removes the interference. is being considered as a countermeasure.
上述の同一周波数中継方式においては、送信信
号１０４の搬送波周波数を設定する手段として
は、搬送波発生回路１３において生成される搬送
波信号の周波数と、局部発振器１５において生成
される局部発振信号の周波数との双方が関与して
おり、これらの周波数値における実際上の偏差ま
たは時間変動等により、送信信号１０４の搬送波
周波数は、厳密には受信信号１０３の搬送波周波
数f1に対して常時一致した値をとることがあり得
ない。このため、送信信号の受信信号に対する漏
れ込みにより、ビート周波数成分が生成される
が、このビート周波数成分は、本来、受信信号の
搬送波信号の位相に対して無相関に生成されてい
るため、復調器１１に備えられている前記等化回
路による振幅歪ならびに位相歪の除去作用をもつ
てしても、このビート周波数成分を除去すること
ができない。従つて、送信信号の受信信号に対す
る漏れ込みによる干渉によつて、無線通信回線に
おける回線品質を正常に維持することができない
という欠点がある。
In the same frequency repeating method described above, the means for setting the carrier frequency of the transmission signal 104 is to set the frequency of the carrier signal generated in the carrier wave generation circuit 13 and the frequency of the local oscillation signal generated in the local oscillator 15. Strictly speaking, the carrier frequency of the transmitted signal 104 always takes the same value as the carrier frequency f 1 of the received signal 103 due to actual deviations or time fluctuations in these frequency values. That's impossible. Therefore, a beat frequency component is generated due to leakage of the transmitted signal into the received signal, but since this beat frequency component is originally generated uncorrelated with the phase of the carrier signal of the received signal, demodulation Even if the equalization circuit provided in the receiver 11 removes amplitude distortion and phase distortion, this beat frequency component cannot be removed. Therefore, there is a drawback that line quality in the wireless communication line cannot be maintained normally due to interference caused by leakage of the transmitted signal to the received signal.
上述の問題点を解決するために、本発明の同一
周波数中継方式は、所定の中継局を介して形成さ
れる同一周波数無線通信回線において、前記中継
局に、中継局における受信信号の搬送波信号に対
して位相相関を有する送信信号の搬送波信号を生
成するための、搬送波再生用位相同期手段を備え
ている。
In order to solve the above-mentioned problems, the same-frequency relay system of the present invention provides a same-frequency wireless communication line formed through a predetermined relay station. A phase synchronization means for carrier wave regeneration is provided for generating a carrier wave signal of a transmission signal having a phase correlation with respect to the carrier wave signal.
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 explained with reference to the drawings.
第１図は本発明の一実施例における中継局の一
方向のルートに対応する中継システムの主要部を
示すブロツク図で、受信アンテナ１と、受信器２
と、復調器３と、変調器４と、送信器５と、局部
発振器６とが備えられている。 FIG. 1 is a block diagram showing the main parts of a relay system corresponding to a one-way route of a relay station in an embodiment of the present invention, including a receiving antenna 1, a receiver 2,
, a demodulator 3 , a modulator 4 , a transmitter 5 , and a local oscillator 6 .
第１図において、搬送波周波数がf1の受信信号
１０１は、受信アンテナ１を介して受信器２に入
力される。受信器２には周波数変換器および中間
周波数増幅器等が備えられており、局部発振器６
から送られてくる局部発振信号により、受信信号
１０１は所定の中間周波信号に変換され、前記中
間周波増幅器により増幅されて復調器３に入力さ
れる。この場合、前記中間周波信号の搬送波周波
数は、受信信号１０１の搬送波周波数f1と局部発
振器６から送られてくる局部発振信号の周波数f2
との差周波数に等しく、また、その位相は、受信
信号１０１の位相θ1と前記局部発振信号の位相θ2
との差に等しい。復調器３は、前述の従来例の場
合と同様に、例えばデイジタル多相位相変調波ま
たはデイジタル多値直交振幅変調波等の入力に対
応して、復調方式としては直交位相同期検波方式
を用いて構成されており、また、受信信号に含ま
れている振幅歪ならびに位相歪を除去するための
等化回路等が備えられている。 In FIG. 1, a received signal 101 with a carrier frequency f 1 is input to a receiver 2 via a receiving antenna 1 . The receiver 2 is equipped with a frequency converter, an intermediate frequency amplifier, etc., and a local oscillator 6.
The received signal 101 is converted into a predetermined intermediate frequency signal by a local oscillation signal sent from the intermediate frequency amplifier, amplified by the intermediate frequency amplifier, and input to the demodulator 3. In this case, the carrier frequency of the intermediate frequency signal is the carrier frequency f 1 of the received signal 101 and the frequency f 2 of the local oscillation signal sent from the local oscillator 6.
and its phase is equal to the difference frequency between the received signal 101 phase θ 1 and the local oscillation signal phase θ 2
equal to the difference between As in the case of the conventional example described above, the demodulator 3 uses a quadrature phase coherent detection method as a demodulation method in response to the input of, for example, a digital multiphase phase modulated wave or a digital multilevel quadrature amplitude modulated wave. It is also equipped with an equalization circuit and the like for removing amplitude distortion and phase distortion contained in the received signal.
復調器３においては、前記直交位相同期検波方
式に包含される搬送波再生用位相同期ループを介
して、前記中間周波信号の搬送波周波数（f1〜
f2）に周波数が等しく、位相が（θ1〜θ2）に等し
い搬送波信号が再生され、この搬送波再生信号に
より、復調器３に含まれている一対の位相検波器
を介して前記中間周波信号が位相検波され、ベー
スバンド信号が出力される。この場合、周波数が
（f1〜f2）、位相が（θ1〜θ2）の前記搬送波再生信
号は、送信信号に対応する搬送波信号として変調
器４に送られる。変調器４においては、復調器３
より送られてくるベースバンド信号により、前記
搬送波再生信号が変調され、その被変調波信号は
送信器５に入力される。送信器５には周波数変換
器および電力増幅器等が備えられており、局部発
振器６から送られてくる周波数f2、位相θ2の局部
発振信号により、前記被変調波信号は、その搬送
波周波数が（f1〜f2）〜f2＝f1、位相が（θ1〜θ2）
〜θ2＝θ1の送信信号に変換され、前記電力増幅器
により電力増幅されて、送信信号１０２として送
信アンテナ７より送出される。上述のように、送
信信号１０２の搬送波周波数はf1に、位相はθ1に
設定されており、これらの周波数および位相は、
ともに前述の受信信号１０１の搬送波周波数およ
び位相に相等しい。従つて、送信信号の受信信号
に対する漏れ込みによる干渉信号は、相互の搬送
波周波数が相等しく、且つ相互の位相が一定の相
関関係にあるため、前述の等化回路において、振
幅歪ならびに位相歪の場合と全く同一原理により
除去される。なお、上記の説明においては、直交
位相同期検波方式を用いて構成され、振幅歪なら
びに位相歪等を除去する等化回路等を含む復調器
の詳細については説明を省略しているが、一例と
して、特開昭59−105741“８相位相復調器”が参
照される。 In the demodulator 3, the carrier frequency (f 1 ~
A carrier wave signal having a frequency equal to f 2 ) and a phase equal to (θ 1 to θ 2 ) is regenerated, and this carrier wave regenerated signal transmits the intermediate frequency signal through a pair of phase detectors included in the demodulator 3. The signal is phase detected and a baseband signal is output. In this case, the carrier wave reproduction signal having a frequency of (f 1 to f 2 ) and a phase of (θ 1 to θ 2 ) is sent to the modulator 4 as a carrier wave signal corresponding to the transmission signal. In the modulator 4, the demodulator 3
The carrier wave reproduction signal is modulated by the baseband signal sent from the transmitter 5, and the modulated wave signal is input to the transmitter 5. The transmitter 5 is equipped with a frequency converter, a power amplifier, etc., and by the local oscillation signal of frequency f 2 and phase θ 2 sent from the local oscillator 6, the modulated wave signal has its carrier frequency changed. (f 1 ~ f 2 ) ~ f 2 = f 1 , the phase is (θ 1 ~ θ 2 )
The signal is converted into a transmission signal of ˜θ 2 =θ 1 , power amplified by the power amplifier, and sent out from the transmission antenna 7 as a transmission signal 102 . As mentioned above, the carrier frequency of the transmitted signal 102 is set to f 1 and the phase is set to θ 1 , and these frequencies and phases are
Both are equal to the carrier frequency and phase of the received signal 101 described above. Therefore, since the interference signals caused by the leakage of the transmitted signal to the received signal have the same carrier frequency and a certain correlation in phase, the equalization circuit described above can reduce amplitude distortion and phase distortion. It is removed using exactly the same principle as in the case. Note that in the above explanation, details of the demodulator, which is configured using a quadrature phase coherent detection method and includes an equalization circuit for removing amplitude distortion, phase distortion, etc., are omitted, but as an example, , JP-A-59-105741 "Eight-phase phase demodulator" is referred to.
上記の一実施例においては、送信信号の受信信
号に対する漏れ込みによる干渉信号の除去手段と
して、受信信号に含まれている振幅歪ならびに位
相歪を除去する等化回路が用いられているが、仮
に前記等化回路が中継システムに備えられていな
い場合においても、例えば、第１図において、変
調器４から出力される被変調波信号を分軌岐し
て、所定のトランスバーサル・フイルタを介して
受信器２より出力される中間周波信号に加算する
ことによつても、前記干渉信号を除去することが
可能である。 In the above embodiment, an equalization circuit that removes amplitude distortion and phase distortion contained in the received signal is used as a means for removing interference signals caused by leakage of the transmitted signal into the received signal. Even when the relay system is not equipped with the equalization circuit, for example, as shown in FIG. 1, the modulated wave signal output from the modulator 4 is branched and passed through a predetermined transversal filter. The interference signal can also be removed by adding it to the intermediate frequency signal output from the receiver 2.
以上説明したように、本発明は、中継局を介し
て形成される同一周波数無線通信回線において、
中継局における送信信号を、受信信号に対して位
相相関を有するように形成することにより、送信
信号の受信信号に対する漏れ込みによる干渉信号
の除去が極めて容易に行われ、前記同一周波数無
線通信回線の回線品質を正常に維持することがで
きるという効果がある。
As explained above, the present invention provides for same-frequency wireless communication lines formed via relay stations,
By forming the transmitted signal at the relay station to have a phase correlation with the received signal, interference signals caused by leakage of the transmitted signal to the received signal can be removed extremely easily, and the same frequency wireless communication line can be easily removed. This has the effect that line quality can be maintained normally.
第１図は本発明の一実施例における中継局の一
方向のルートに対応する中継システムの主要部を
示すブロツク図、第２図は従来例の同一周波数中
継方式における、中継局の一方向のルートに対応
する中継システムの主要部を示すブロツク図であ
る。
図において、１，８……受信アンテナ、２，９
……受信器、３，１１……復調器、４，１２……
変調器、５，１４……送信器、６，１０，１５…
…局部発振器、７，１６……送信アンテナ、１３
……搬送波発生回路。
FIG. 1 is a block diagram showing the main parts of a relay system corresponding to a one-way route of a relay station in an embodiment of the present invention, and FIG. FIG. 2 is a block diagram showing the main parts of a relay system corresponding to a route. In the figure, 1, 8...receiving antenna, 2, 9
... Receiver, 3, 11 ... Demodulator, 4, 12 ...
Modulator, 5, 14... Transmitter, 6, 10, 15...
... Local oscillator, 7, 16 ... Transmission antenna, 13
...Carrier wave generation circuit.
Claims (1)
無線通信回線において、前記中継局に、中継局に
おける受信信号の搬送波信号に対して位相相関を
有する送信信号の搬送波信号を生成するための、
搬送波再生用位相同期手段を備えることを特徴と
する同一周波数中継方式。 ２ 前記中継局において、受信信号の搬送波周波
数を下方に変換するための周波数変換用局部発振
信号と、送信信号の搬送波周波数を形成するため
の周波数変換用局部発振信号とが共用されてお
り、復調器に含まれる前記搬送波再生用位相同期
手段によつて生成される搬送波再生信号が、変調
器に対する搬送波信号として設定される特許請求
の範囲第１項記載の同一周波数中継方式。[Scope of Claims] 1. In a same frequency wireless communication line formed through a predetermined relay station, a carrier wave signal of a transmitted signal having a phase correlation with a carrier wave signal of a received signal at the relay station is transmitted to the relay station. to generate,
A same frequency repeating system characterized by comprising phase synchronization means for carrier wave regeneration. 2. In the relay station, a frequency conversion local oscillation signal for downwardly converting the carrier frequency of the received signal and a frequency conversion local oscillation signal for forming the carrier frequency of the transmission signal are shared, and the demodulation 2. The same frequency repeating system according to claim 1, wherein a carrier wave recovery signal generated by said carrier wave recovery phase synchronization means included in a modulator is set as a carrier wave signal for a modulator.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21838085A JPS6277725A (en) | 1985-09-30 | 1985-09-30 | Same frequency relay system |
| AU62767/86A AU588176B2 (en) | 1985-09-18 | 1986-09-17 | One frequency repeater for a digital radio system |
| CA000518349A CA1250022A (en) | 1985-09-18 | 1986-09-17 | One frequency repeater having interference cancellation capability in a digital radio system |
| EP86112842A EP0215479B1 (en) | 1985-09-18 | 1986-09-17 | One frequency repeater for a digital radio system |
| DE8686112842T DE3681388D1 (en) | 1985-09-18 | 1986-09-17 | RADIO RELAY WITH ONLY ONE FREQUENCY 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 |
|---|---|---|---|
| JP21838085A JPS6277725A (en) | 1985-09-30 | 1985-09-30 | Same frequency relay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6277725A JPS6277725A (en) | 1987-04-09 |
| JPH0523652B2 true JPH0523652B2 (en) | 1993-04-05 |
Family
ID=16718989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21838085A Granted JPS6277725A (en) | 1985-09-18 | 1985-09-30 | Same frequency relay system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6277725A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003060997A (en) * | 2001-08-21 | 2003-02-28 | Hitachi Ltd | Digital broadcast retransmitter |
| JP4526898B2 (en) | 2003-09-16 | 2010-08-18 | パナソニック株式会社 | Relay device, terminal device, and relay method |
-
1985
- 1985-09-30 JP JP21838085A patent/JPS6277725A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6277725A (en) | 1987-04-09 |
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