JPS61161056A - One frequency repeater - Google Patents
One frequency repeaterInfo
- Publication number
- JPS61161056A JPS61161056A JP164285A JP164285A JPS61161056A JP S61161056 A JPS61161056 A JP S61161056A JP 164285 A JP164285 A JP 164285A JP 164285 A JP164285 A JP 164285A JP S61161056 A JPS61161056 A JP S61161056A
- Authority
- JP
- Japan
- Prior art keywords
- modulated wave
- filter
- digital
- signal
- interference
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 230000002596 correlated effect Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001172 regenerating effect 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はマイクロ波帯のディジタル伝送の中継器に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a repeater for digital transmission in the microwave band.
（従来技術とその問題点）
従来のマイクロ波帯の中継方式では、１往復システムを
２つの搬送波で構成する２周波方式を採用している。第
２図にその例を示す。図中、１００．１０１゜１０２は
中継器を示し、ｆｌ、 ｆ２は２つの搬送波周波数を示
す。この例で中継器１０１を例に取ると、左右２方向に
同一周波数で１０送信し、同一周波数ｒ２を逆の左右２
方向から受信している。かかる方式については文献桑原
守二ｌ監修［ディジタルマイクロ波通信１（企画センタ
ー）に述べられている。(Prior art and its problems) The conventional microwave band relay system employs a two-frequency system in which one round-trip system is configured with two carrier waves. An example is shown in FIG. In the figure, 100.101°102 indicates a repeater, and fl and f2 indicate two carrier frequencies. In this example, if we take the repeater 101 as an example, it transmits 10 times at the same frequency in the left and right directions, and transmits the same frequency r2 in the opposite left and right directions.
Receiving from the direction. Such a method is described in the document supervised by Moriji Kuwahara [Digital Microwave Communication 1 (Planning Center)].
２周波方式は送信と受信とで別の周波数を使用している
ため、送受間干渉を軽減することができる。この方式の
欠点は次に述べる一周波数方式に比較して２倍の周波数
帯域を必要とする点である。Since the two-frequency system uses different frequencies for transmission and reception, interference between transmitter and receiver can be reduced. The disadvantage of this method is that it requires twice the frequency band compared to the single frequency method described below.
第３図は、−周波数方式を説明するための図であり、通
常送信用と受信用に別々のアンテナを用意し、その間の
干渉をできるだけ少なくする様に、直横並べて運用する
ものである。FIG. 3 is a diagram for explaining the -frequency system, in which separate antennas are normally prepared for transmission and reception, and are operated side by side to minimize interference between them.
第４図は、−周波数方式の送受間干渉の様子を説明する
図であり、第３図の中継器１０１を例にとって描かれて
いる。上り回線として信・号２０３が左から右へ信号２
０２となって中継され、下り回線として信号２０１が左
から右へ信号２０２となって中継されている。今、受信
信号２０１に対する送受間干渉を考えてみると、上り回
線送信信号２００からの干渉信号２０３と下り回線送信
信号２０２からの干渉信号２０４が存在する訳である。FIG. 4 is a diagram illustrating the state of interference between transmitting and receiving in the -frequency system, and is drawn using the repeater 101 in FIG. 3 as an example. Signal 203 is the uplink signal 2 from left to right
The signal 201 is relayed as a signal 202 from left to right as a downlink. Now, if we consider the interference between the transmitter and the receiver with respect to the received signal 201, there are an interference signal 203 from the uplink transmission signal 200 and an interference signal 204 from the downlink transmission signal 202.
図中１８０，１８１は各々上り、下り回線用の再生中１
！器を示している。In the figure, 180 and 181 are playing 1 for uplink and downlink, respectively.
! It shows the vessel.
第５図は、第４図の送受間干渉のある中継器の等価ベー
スバンドモデルを示したものである。図中１８０’ 、
１８１’は第４図の再生中継器１８０，１８１に対応す
る信号識別器（送信符号を識別する）であり、遅延回路
１３４．１３５．１３６．１３７は送信用アンテナから
の受信用アンテナまでの伝搬時間に対応するもので、送
受間干渉信号に必ず付いて回るものである。また掛算器
１３０．１３１．１３２．１３３は各々の搬送周波数の
微妙な差により発生する干渉波信号の位相回転を表わし
ており、その回転角速度ΔＷ、は一般にΔｗ、４シンボ
ル・レート
である。加算器１４０．１４１は受信信号に送受間干渉
が加わることを示すものである。端子１００１．１００
３は送受アンテナ、端子１００４．１００５は受信アン
テナに対応する。FIG. 5 shows an equivalent baseband model of the repeater shown in FIG. 4 with interference between transmitting and receiving. 180' in the figure,
181' is a signal discriminator (identifies the transmission code) corresponding to the regenerative repeaters 180 and 181 in FIG. It corresponds to time and always follows interference signals between transmitter and receiver. Multipliers 130, 131, 132, and 133 represent the phase rotation of the interference wave signal caused by a slight difference between the respective carrier frequencies, and the rotational angular velocity ΔW is generally Δw, a 4-symbol rate. Adders 140 and 141 indicate that interference between transmitter and receiver is added to the received signal. Terminal 1001.100
3 corresponds to a transmitting/receiving antenna, and terminals 1004 and 1005 correspond to receiving antennas.
（発明の目的）
本発明の目的は係る送受間干渉を適応制御技術により除
去し、周波数利用効率にすぐれた一周波方式を実現する
装置を提供することにある。(Objective of the Invention) An object of the present invention is to provide a device that eliminates such transmitter-receiver interference by adaptive control technology and realizes a single frequency system with excellent frequency utilization efficiency.
（発明の構成）
本発明は第１のディジタル変調波を第１の受信ポートよ
り、上り回線として受け、同変調波を識別し、前記第１
の変調波と同一周波数で再変調し、第１の受信ボートよ
り第２のディジタル変調波として出力し、第３のディジ
タル変調波を第２の受信ポートより下り回線として受け
、同変調波を復調し、前記第２の変調波と同一周波数で
第２の送信ボートより第４のディジタル変調波として出
力する一周波中継器に於いて、
（ａ）前記第１のディジタル変調波の識別後の信号をフ
ィルタリングする第１のフィルタ；
（ｂ）前記第３のディジタル変調波の識別後の信号をフ
ィルタリングする第２のフィルタ；
（ｃ）前記第３のディジタル変調波の識別前の信号と前
記第１及び第２のフィルタ出力を加算する加算器；とを
含み該加算器出力より前記第１．第２の送信ボートから
の送受間干渉が除去された前記第３の変調波を得ること
を特徴とする一周波中継器である。(Structure of the Invention) The present invention receives a first digital modulated wave from a first receiving port as an uplink, identifies the modulated wave, and receives the first digital modulated wave from the first reception port.
The modulated wave is re-modulated at the same frequency as the modulated wave, outputted as a second digital modulated wave from the first reception port, and the third digital modulated wave is received as a downlink from the second reception port, and the same modulated wave is demodulated. In a single-frequency repeater that outputs a fourth digital modulated wave from a second transmission boat at the same frequency as the second modulated wave, (a) a signal after identification of the first digital modulated wave; (b) a second filter that filters the signal after identification of the third digital modulation wave; (c) the signal before identification of the third digital modulation wave and the first and an adder for adding the outputs of the first and second filters; The single frequency repeater is characterized in that it obtains the third modulated wave from which interference between transmission and reception from the second transmission boat has been removed.
（構成の詳細な説明）
第５図に送受間干渉の様子を示したが、先に述べた様に
Δｗ、４シンボル・レートであることから、掛算１ｘａ
ｏ、 １３１．１３２．１３３はその係数がゆっくり変
化する複素係数器で置き換えることができ、短時間には
複素定数係数器として考えられる。従って同図内の端子
１２００と１２０１間の干渉を除去する為にはこれと全
く同一の作用をするフィルタを用意し、これに識別器１
８０′からの出力を印加し、干渉信号の複製を作り、こ
れを受信アンテナ信号（端子１００５）から減すること
により、先の干渉成分は相殺されることになる。実際に
はΔＷ≠０であるので先のフィルタはΔＷの変化に従っ
て変化する必要がある。(Detailed explanation of the configuration) Figure 5 shows the state of interference between transmitter and receiver.As mentioned earlier, since Δw is a 4 symbol rate, the multiplication 1xa
o, 131.132.133 can be replaced by a complex coefficient multiplier whose coefficients change slowly and can be considered as a complex constant multiplier for a short time. Therefore, in order to remove the interference between terminals 1200 and 1201 in the same figure, a filter with exactly the same effect as this is prepared, and the discriminator 1
By applying the output from 80' to create a replica of the interfering signal and subtracting it from the receive antenna signal (terminal 1005), the previous interfering component will be cancelled. Actually, since ΔW≠0, the above filter needs to change according to the change in ΔW.
（実施例）
第１図は本発明の一実施例を示す図である。図中、参照
番号２００．２０１．２０２．２０３．１０１は第４図
の同一参照数字に対応するものである。(Example) FIG. 1 is a diagram showing an example of the present invention. In the figure, reference numbers 200.201.202.203.101 correspond to the same reference numbers in FIG.
１．３はディジタル変調波をベースバンドの信号へ変換
する基調器、２，４は逆にベースバンドのディジタル信
号を変調する変調器を示す。５，６は受信してディジタ
ル・ベースバンド信号から送信符号を識別する識別器で
あり、第５図の参照番号１８０’、 １８１”の識別器
に対応するものである。７，８は送受間干渉除去装置で
あり、その構成はブロック８に例をとると識別器５から
の識別値系列を入力として、第５図に示した端子１２０
０．１２０１間と同一特性を有するフィルタ８０と、第
５図１２０２．１２０３間と同一特性を有するフィルタ
８１とこれらの出力を送受間干渉を相殺する為に入力信
号から減する為の加算器（減算器）８３から成っている
。ここで遅延回路８２は入力信号とフィルタｓｏ、 ｓ
ｉとの相対時間を単に調整する為のものである。Reference numeral 1.3 indicates a keynote device that converts a digital modulated wave into a baseband signal, and 2 and 4 indicate modulators that modulate the baseband digital signal. 5 and 6 are discriminators that receive and identify the transmitted code from the digital baseband signal, and correspond to the discriminators with reference numbers 180' and 181'' in FIG. This is an interference cancellation device, and its configuration is, for example, block 8, which receives the discrimination value series from the discriminator 5 and connects it to the terminal 120 shown in FIG.
A filter 80 having the same characteristics as between 1202 and 1203 in FIG. 5, a filter 81 having the same characteristics as between 1202 and 1203 in FIG. 5, and an adder ( (subtractor) 83. Here, the delay circuit 82 connects the input signal and the filters so, s
This is simply to adjust the relative time with i.
ブロック７はこれと全く同一の構成を有しており、第１
図の入力信号２０３への送受間干渉を除去する為のもの
である。Block 7 has exactly the same configuration as this, and the first
This is to eliminate interference between transmission and reception to the input signal 203 in the figure.
第６図は第１図の実施例の中で、フィルタ８０の詳細及
びその周辺部を示したものである。図中８０．８３゜６
は第１図の参照番号８０．８３．６と同一のものである
。FIG. 6 shows details of the filter 80 and its surroundings in the embodiment of FIG. 1. 80.83°6 in the figure
is the same as reference number 80.83.6 in FIG.
８０はトランスバーサル・フィルタと呼ばれるもので、
８０１．８０２．８０３．８０４は遅延回路、８０５．
８０６．８０７゜８０８、８０９は係数タップであり、
この係数を変化させることにより任意の特性のフィルタ
を実現することができる。第６図のブロック９は係数タ
ップの係数アダプティブに制御する制御装置の一実施例
を示したものである。送受干渉信号は識別器の入出力差
（減算器９１を用いて）により、識別誤差ｅとして検出
され、この誤差は送信符号と本来強い相関を有している
ことから、入力端子１１０１から入力される送信符号と
ｅとが掛算器９３で相関がとられ、次のローパスフィル
タ９とで平滑化され、この相関が零になる方向にタップ
の係数が制御される。80 is called a transversal filter,
801.802.803.804 is a delay circuit, 805.
806.807° 808, 809 are coefficient taps,
By changing this coefficient, a filter with arbitrary characteristics can be realized. Block 9 in FIG. 6 shows an embodiment of a control device that adaptively controls coefficient taps. The transmission/reception interference signal is detected as a discrimination error e by the input/output difference of the discriminator (using the subtracter 91), and since this error has a strong correlation with the transmission code, it is input from the input terminal 1101. A multiplier 93 takes a correlation between the transmission code and e, and the next low-pass filter 9 smoothes the correlation, and the coefficients of the taps are controlled so that this correlation becomes zero.
（発明の効果）
以上の様に本発明によれば従来２周波方式で運用されて
たマイクロ波中継方式は一周波方式で実現でき、その周
波数利用効率は２倍となる。(Effects of the Invention) As described above, according to the present invention, the microwave relay system, which was conventionally operated as a two-frequency system, can be realized as a single-frequency system, and the frequency utilization efficiency is doubled.
第１図は本発明の一実施例を示す図、
第２図は従来の２周波中継方式を説明する図、第３図は
一周波中継方式を説明する図、第４図は一周波中継方式
に於ける送受間干渉を説明する為の図、
第５図は第４図のベースバンド等価回路を示す図、
第６図はフィルタの構成例を示す図である。
図において、
１．３・・・復調器、２，４・・・変調器、５，６・・
・識別器、７・・・送受間干渉除去装置、７０．７１．
８０．８１・・・フィルタ、７２．８２・・・遅延回路
、７３．８３・・・加算器、をそれぞれ示す。Figure 1 is a diagram showing an embodiment of the present invention, Figure 2 is a diagram explaining a conventional two-frequency relay system, Figure 3 is a diagram explaining a single-frequency relay system, and Figure 4 is a diagram explaining a single-frequency relay system. FIG. 5 is a diagram showing the baseband equivalent circuit of FIG. 4, and FIG. 6 is a diagram showing an example of the configuration of a filter. In the figure, 1.3... demodulator, 2, 4... modulator, 5, 6...
- Discriminator, 7... Transmission/reception interference removal device, 70.71.
80.81...filter, 72.82...delay circuit, 73.83...adder, respectively.
Claims (1)
回線として受け、同変調波を識別し、前記第１の変調波
と同一周波数で再変調し、第１の送信ポートより第２の
ディジタル変調波として出力し、第３のディジタル変調
波を第２の受信ポートより下り回線として受け、同変調
波を復調し、前記第２の変調波と同一周波数で第２の送
信ポートより第４のディジタル変調波として出力する一
周波中継器に於いて、 （ａ）前記第１のディジタル変調波の識別後の信号をフ
ィルタリングする第１のフィルタ、 （ｂ）前記第３のディジタル変調波の識別後の信号をフ
ィルタリングする第２のフィルタ、 （ｃ）前記第３のディジタル変調波の識別前の信号と前
記第１及び第２のフィルタ出力を加算する加算器、とを
含み該加算器出力より前記第１、第２の送信ポートから
の送受間干渉が除去された前記第３の変調波を得ること
を特徴とする一周波中継器。[Claims] A first digital modulated wave is received as an uplink from a first receiving port, the same modulated wave is identified, the modulated wave is re-modulated at the same frequency as the first modulated wave, and the first digital modulated wave is transmitted. It outputs a second digital modulated wave from the port, receives a third digital modulated wave as a downlink from the second receiving port, demodulates the same modulated wave, and generates a second digital modulated wave at the same frequency as the second modulated wave. In a single frequency repeater that outputs a fourth digital modulated wave from a transmission port, (a) a first filter that filters a signal after identifying the first digital modulated wave; (b) a first filter that filters the signal after identifying the first digital modulated wave; a second filter that filters a signal after identification of the digital modulation wave; (c) an adder that adds the signal before identification of the third digital modulation wave and the outputs of the first and second filters; A single frequency repeater characterized in that the third modulated wave from which interference between transmission and reception from the first and second transmission ports has been removed is obtained from the output of the adder.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP164285A JPS61161056A (en) | 1985-01-09 | 1985-01-09 | One frequency repeater |
| CA000499209A CA1235751A (en) | 1985-01-09 | 1986-01-08 | One frequency repeater for a digital microwave radio system with cancellation of transmitter-to-receiver interference |
| AU52119/86A AU574995B2 (en) | 1985-01-09 | 1986-01-09 | One frequency digital radio repeater |
| EP86100232A EP0187672B1 (en) | 1985-01-09 | 1986-01-09 | One frequency repeater for a digital microwave radio system with cancellation of transmitter-to-receiver interference |
| DE8686100232T DE3681798D1 (en) | 1985-01-09 | 1986-01-09 | SINGLE-FREQUENCY RADIO RELAY FOR A DIGITAL MICROWAVE RADIO SYSTEM WITH COMPENSATION OF INTERFREQUENCY BETWEEN TRANSMITTERS AND RECEIVERS. |
| US06/817,380 US4701935A (en) | 1985-01-09 | 1986-01-09 | One frequency repeater for a digital microwave radio system with cancellation of transmitter-to-receiver interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP164285A JPS61161056A (en) | 1985-01-09 | 1985-01-09 | One frequency repeater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61161056A true JPS61161056A (en) | 1986-07-21 |
| JPH0525420B2 JPH0525420B2 (en) | 1993-04-12 |
Family
ID=11507176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP164285A Granted JPS61161056A (en) | 1985-01-09 | 1985-01-09 | One frequency repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61161056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2366958A (en) * | 2000-05-25 | 2002-03-20 | Comm Res Lab The | A receiver for more accurately estimating transmission path characteristics when receiving a signal including a data and a known signal |
| JP2005192185A (en) * | 2003-12-05 | 2005-07-14 | Ntt Docomo Inc | Radio relay apparatus and radio relay transmission method |
-
1985
- 1985-01-09 JP JP164285A patent/JPS61161056A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2366958A (en) * | 2000-05-25 | 2002-03-20 | Comm Res Lab The | A receiver for more accurately estimating transmission path characteristics when receiving a signal including a data and a known signal |
| GB2366958B (en) * | 2000-05-25 | 2004-05-12 | Comm Res Lab The | Receiver, receiving method, and recording medium which records program for receiving data signals |
| US7006430B2 (en) | 2000-05-25 | 2006-02-28 | National Institute Of Information And Communications Technology, Incorporated Administrative Agency | Receiver, receiving method, and recording medium which records program for receiving data signals |
| JP2005192185A (en) * | 2003-12-05 | 2005-07-14 | Ntt Docomo Inc | Radio relay apparatus and radio relay transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525420B2 (en) | 1993-04-12 |
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