JP2004048202A

JP2004048202A - Wireless relay method and apparatus thereof

Info

Publication number: JP2004048202A
Application number: JP2002200657A
Authority: JP
Inventors: Toshiyuki Maeyama; 前山　利幸; Takashi Inoue; 井上　隆; Kazutaka Kamimura; 上村　和孝
Original assignee: Furukawa Electric Co Ltd; KDDI Corp
Current assignee: Furukawa Electric Co Ltd; KDDI Corp
Priority date: 2002-07-09
Filing date: 2002-07-09
Publication date: 2004-02-12

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless relay apparatus that accurately obtains a delay amount of a sneaked interference wave transmission path of an antenna to generate an interference reference signal with the same delay amount for canceling the interference wave and that accurately receives a radio wave with a particular frequency so as to enhance the reception accuracy of the radio wave and improve the transmission efficiency. <P>SOLUTION: A correlation arithmetic unit 19 performs a correlation arithmetic operation between an output signal (signal 2) of a directional coupler 11 sneaked through a space and an output signal (signal 3) of the directional coupler 11 through an interference suppression section 15 with respect to the interference reference signal (signal 1) divided by a directional coupler 13 to obtain a delay amount of the sneaked interference wave transmission path between antennas 10, 16 thereby accurately receiving the radio wave with the particular frequency. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、受信した希望波を増幅して中継する無線中継方法およびその装置に関し、特に一方のアンテナから他方のアンテナに回り込む干渉波を抑圧して希望波の無線中継を行う無線中継方法およびその装置に関するものである。
【０００２】
【従来の技術】
従来の無線中継装置は、例えば移動体通信などの無線基地局と携帯電話の移動局間において、山岳地域や平野部であってもビル内あるいはトンネル内などの比較的電波の届きにくい場所で用いられている。このような無線中継装置には、符号分割多元接続方式あるいは符号分割多重方式を用いたリピータ装置があり、このリピータ装置は、基地局からの電波が届く、高台やビルの屋上に設置され、対基地局用の送受信アンテナと対移動局用の送受信アンテナを介して基地局と移動局間の希望波の無線中継を行っていた。通常、これらのアンテナは、一方のアンテナから中継送信された電波が他方のアンテナに再受信されないように、十分に離れた場所に設置することが必要となる。
【０００３】
ところが、例えばビル影などの電波の届きにくい場所での対策として、リピータ装置をビルの屋上に設置する場合には、対基地局用のアンテナと対移動局用のアンテナとを設置スペースの関係から近接した場所に設置したい場合が生じる。この場合には、一方のアンテナから送信された電波は、他方のアンテナに回り込むこととなる。この再受信された電波（干渉波）は、希望波と同一周波数であるため、回り込んだ受信信号は、干渉信号となってリピータ装置の中継に影響を与え、希望波の伝送効率が低下する原因となる。
【０００４】
そこで、この問題を解決するために、従来では、干渉抑圧波を作成して回り込んでくる干渉波をキャンセルするものがあった。この干渉抑圧波を作成するのに必要な情報としては、干渉波伝達経路の位相や振幅の変化量が挙げられるが、干渉波の占有周波数帯域が広帯域の場合には、この干渉波の遅延量の情報も必要となる。
【０００５】
この干渉波伝達経路の遅延量を検出する方法としては、例えば図６に示すように、ネットワークアナライザを用いてこの干渉波伝達経路の遅延量を直接測定する方法がある。この図６では、受信アンテナ１０と送信アンテナ１６の間に２つの方向性結合器１１，１３と増幅部１２が接続されるとともに、方向性結合器１１，１３間は別経路でネットワークアナライザ１４が接続されており、このネットワークアナライザ１４を用いて干渉波伝達経路の遅延量を求めている。また、方向性結合部１３と１１には、干渉抑圧部１５が接続されている。
【０００６】
この従来例では、受信アンテナ１０で受信した受信信号を増幅部１２で増幅して方向性結合器１３を介して送信アンテナ１６から送信されるとともに、この受信信号は、方向性結合器１３で分岐される。この干渉抑圧部１５では、この受信信号に対して遅延量が調整された後に、さらに位相および振幅が調整されて方向性結合器１１で受信信号と結合されている。
【０００７】
また、ネットワークアナライザ１４からは、無変調信号が出力されており、この無変調信号は、方向性結合器１３を介して送信アンテナ１６から送信される。この時、増幅部１２の利得を下げ、信号の通過が増幅部１２により阻止されるようにしておく。この無変調波は、空間を伝搬して干渉波として受信アンテナ１０に取り込まれる。受信された干渉信号は、方向性結合器１１で検出され、ネットワークアナライザ１４に取り込まれて、干渉波伝達経路の遅延量が測定される。このネットワークアナライザ１４により測定した遅延量を干渉抑圧部１５の図示しない遅延回路に設定しており、干渉抑圧部１５は、この情報に基づき、所定の遅延量を持った干渉参照信号を生成して、受信アンテナ１０からの受信信号に結合させることで、干渉信号をキャンセルしていた。すなわち、干渉抑圧部１５では、干渉信号と同じ遅延量で、逆位相、同振幅の干渉波抑圧信号を生成し、方向性結合器１１で受信信号にこの干渉波抑圧信号を加えることで、回り込み干渉信号をキャンセルしていた。
【０００８】
また、その他の方法としては、例えば干渉波伝達経路の経路長が容易に測定できる場合には、その経路長と干渉波の伝達速度から遅延時間を計算する方法もある。さらに、占有周波数帯域内において、希望波が干渉波とにより周波数対振幅特性にリプル波形を発生させる特性を持つシステムにおいては、図７に示すように、方向性結合器１３と干渉抑圧部１５間に接続されたリプル検出部・ＦＦＴ演算部１７でこのリプルを取り出し、取り出した波形を時間波形とみなしてフーリェ変換することにより、希望波に対して遅延している成分を取り出して干渉波伝達経路の遅延量を求めていた。
【０００９】
【発明が解決しようとする課題】
しかしながら、上記従来例の第１の方法では、ネットワークアナライザで使用する無変調波が空間を伝搬することとなるので、電波法令上、無変調波を送信するための免許の取得が必要となり、この無線中継装置が設置されている全ての中継局に、このような有資格者を配置することは困難であるという問題点があった。
【００１０】
また、第２の方法では、干渉波伝達距離が長距離であったり、障害物による反射を含めた経路長であったりすると、正確に干渉波伝達経路の経路長を測定することが非常に難しくなるという問題点があった。また、この方法では、伝搬に使用する電波が高周波になればなるほどその波長が短くなるので、その経路長の測定精度が非常に高いものとなり、さらに測定が難しくなっていた。
【００１１】
また、第３の方法では、取り出したリプル波形を時間波形とみなして、高速フーリェ変換などの演算処理を行う必要があるので、装置構成が複雑で高価なものとなるという問題点があった。
【００１２】
この発明は、上記問題点に鑑みなされたもので、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上させることを目的とする。
【００１３】
【課題を解決するための手段】
上記目的を達成するため、この発明の請求項１では、第１のアンテナから受信された受信信号を増幅および遅延して第２のアンテナから送信するとともに、前記受信信号を分岐して干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継方法において、前記分岐された受信信号と前記遅延された遅延信号との相関演算を行う第１の相関演算工程と、前記第２のアンテナへの送信信号出力を停止させる第１の停止工程と、前記遅延信号から前記干渉参照信号を生成する生成工程と、前記遅延信号と前記干渉参照信号との相関演算を行う第２の相関演算工程と、前記第１および第２の相関演算工程での演算結果から前記干渉波の伝達経路の遅延時間を演算する遅延演算工程と、前記演算された遅延時間に基づいて前記干渉参照信号を遅延させる遅延制御工程とを含むことを特徴とする無線中継方法が提供される。
【００１４】
この発明によれば、分岐された受信信号と遅延された遅延信号との相関演算を行うとともに、遅延信号と干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算することで、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上させる。
【００１５】
この発明の請求項２では、第１のアンテナから受信された受信信号を増幅して第２のアンテナから送信するとともに、前記受信信号を分岐して干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継方法において、変調信号を前記第２のアンテナに出力する信号出力工程と、前記出力された変調信号を分岐する分岐工程と、前記分岐された受信信号と前記分岐された変調信号との相関演算を行う第１の相関演算工程と、前記第１のアンテナからの受信信号入力および第２のアンテナへの送信信号出力を停止させる第１の停止工程と、前記変調信号から前記干渉参照信号を生成する生成工程と、前記出力された変調信号と前記干渉参照信号との相関演算を行う第２の相関演算工程と、前記第１および第２の相関演算工程での演算結果から前記干渉波の伝達経路の遅延時間を演算する遅延演算工程と、前記演算された遅延時間に基づいて前記干渉参照信号を遅延させる遅延制御工程とを含むことを特徴とする無線中継方法が提供される。
【００１６】
この発明によれば、内部から変調信号を出力して、この変調信号と受信信号との相関演算を行うとともに、変調信号と干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算することで、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上させる。
【００１７】
この発明の請求項３では、第１のアンテナから受信された受信信号を増幅手段で増幅し、かつ遅延手段で遅延させた後、第２のアンテナから送信するとともに、前記遅延後に分岐手段で前記遅延信号を分岐させ、該遅延信号から干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継装置において、前記第１のアンテナからの受信信号入力を制限する第１の制限手段と、前記第２のアンテナへの遅延信号出力を制限する第２の制限手段と、前記第１のアンテナで受信された受信信号を幹線から分岐させるとともに、入力する信号を前記幹線の受信信号に結合させる分岐結合手段と、前記分岐結合手段で分岐された受信信号と前記分岐された遅延信号との相関演算を行う第１の相関演算手段と、前記分岐された遅延信号から前記干渉参照信号を生成する生成手段と、前記分岐された遅延信号と前記干渉参照信号との相関演算を行う第２の相関演算手段と、前記第１および第２の相関演算手段での演算結果から前記干渉波の伝達経路の遅延時間を演算する遅延演算手段と、前記演算された遅延時間に基づいて前記干渉参照信号を遅延させる遅延制御手段とを備えたことを特徴とする無線中継装置が提供される。
【００１８】
この発明によれば、分岐された遅延信号に対する分岐結合手段で分岐された受信信号および干渉参照信号との相関演算を行い、これらの演算結果から干渉波伝達経路の遅延時間を求めることで、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波を抑圧し、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上させる。
【００１９】
この発明の請求項４では、上記発明において、前記無線中継装置は、前記相関演算を行う際に、第１および第２の制限手段を制御する制限制御手段をさらに備えたことを特徴とする。
【００２０】
この発明によれば、第１および第２の相関演算手段による相関演算の際に、制限制御手段によって第１および第２の制限手段を制御することで、相関演算に必要な信号を適切に取り込むことを可能にする。
【００２１】
この発明の請求項５では、上記発明において、前記制限制御手段は、前記第１の相関演算手段が相関演算を行う際に、前記第１および第２の制限手段による前記受信信号入力および遅延信号出力を可能にさせ、前記第２の相関演算手段が相関演算を行う際に、前記第２の制限手段による前記遅延信号出力を停止させることを特徴とする。
【００２２】
この発明によれば、第１の相関演算手段による相関演算の際には、受信信号入力と遅延信号出力を適切に行わせ、第２の相関演算手段による相関演算の際には、遅延信号出力の停止を適切に行わせる。
【００２３】
この発明の請求項６では、上記発明において、前記制限制御手段は、遅延演算手段での遅延時間演算後に、前記第１および第２の制限手段による前記受信信号入力および遅延信号出力を可能にさせることを特徴とする。
【００２４】
この発明によれば、遅延時間が演算された時点で干渉参照信号の位相と振幅を制御する運用モードに移行して、遅延信号から干渉参照信号を生成し、この干渉参照信号によって空間を回り込んでくる干渉信号をキャンセルする。
【００２５】
この発明の請求項７では、上記発明において、前記無線中継装置は、前記相関演算を行う際に、前記増幅手段の利得を制御する利得制御手段をさらに備えたことを特徴とする。
【００２６】
この発明によれば、利得制御手段は、相関演算の際に、増幅手段の利得が最適になるように利得制御を行う。
【００２７】
この発明の請求項８では、上記発明において、前記利得制御手段は、前記第１の相関演算手段が相関演算を行う際に、前記増幅手段の利得を下げることを特徴とする。
【００２８】
この発明によれば、第１の相関演算手段による相関演算の際には、利得制御手段は、幹線に接続発振が起こらない程度に増幅手段の利得を下げて、増幅手段の信号通過を阻止する。
【００２９】
この発明の請求項９では、上記発明において、前記利得制御手段は、遅延演算手段での遅延時間演算後に、前記増幅手段の利得を上げることを特徴とする。
【００３０】
この発明によれば、遅延時間演算後には、利得制御手段は、増幅手段の利得を上げて、受信信号通過を可能にする。
【００３１】
この発明の請求項１０では、上記発明において、前記第１のアンテナから受信される受信信号は、自装置から生成されたノイズからなることを特徴とする。
【００３２】
この発明によれば、自装置で生成されて第１のアンテナから取り込まれたノイズを遅延および増幅させた後に、第２のアンテナに出力するとともに、前記第２のアンテナに出力されるノイズを分岐し、前記第１のアンテナからのノイズと前記分岐されたノイズとの相関演算を行う。
【００３３】
この発明の請求項１１では、第１のアンテナから受信された受信信号を増幅手段で増幅させた後、第２のアンテナから送信するとともに、前記増幅後に分岐手段で前記受信信号を分岐させ、該受信信号から干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継装置において、前記第１のアンテナからの受信信号入力を制限する第１の制限手段と、前記第２のアンテナへの送信信号出力を制限する第２の制限手段と、変調信号を前記第２のアンテナに出力する信号出力手段と、前記出力された変調信号を分岐する分岐手段と、前記第１のアンテナで受信された受信信号を幹線から分岐させるとともに、入力する信号を前記受信信号に結合させる分岐結合手段と、前記分岐結合手段で分岐された受信信号と前記変調信号との相関演算を行う第１の相関演算手段と、前記変調信号から前記干渉参照信号を生成する生成手段と、前記変調信号と前記干渉参照信号との相関演算を行う第２の相関演算手段と、前記第１および第２の相関演算手段での演算結果から前記干渉波の伝達経路の遅延時間を演算する遅延演算手段と、前記演算された遅延時間に基づいて前記干渉参照信号を遅延させる遅延制御手段とを備えたことを特徴とする無線中継装置が提供される。
【００３４】
この発明によれば、内部から変調信号を出力して、分岐された変調信号に対する分岐結合手段で分岐された受信信号および干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算することで、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上させる。
【００３５】
この発明の請求項１２では、上記発明において、前記無線中継装置は、前記相関演算を行う際に、前記増幅された受信信号と変調信号の入力切り替えを行う切替制御手段をさらに備えたことを特徴とする。
【００３６】
この発明によれば、第１および第２の相関演算手段による相関演算の際に、切替制御手段によって相関演算に必要な信号を適切に入力させることを可能にする。
【００３７】
この発明の請求項１３では、上記発明において、前記切替制御手段は、前記第１および第２の相関演算手段が相関演算を行う際に、前記変調信号を取り込み、前記遅延制御手段が信号遅延を行う際に、前記増幅された受信信号を取り込むことを特徴とする。
【００３８】
この発明によれば、第１および第２の相関演算手段による相関演算の際には、変調信号入力を適切に行わせ、遅延制御手段による信号遅延の際には、増幅された受信信号入力を適切に行わせる。
【００３９】
この発明の請求項１４では、上記発明において、前記無線中継装置は、前記相関演算を行う際に、前記第１および第２の制限手段を制御する制限制御手段をさらに備えたことを特徴とする。
【００４０】
この発明によれば、第１および第２の相関演算手段による相関演算の際に、制限制御手段によって第１および第２の制限手段を制御することで、相関演算に必要な信号を適切に取り込むことを可能にする。
【００４１】
この発明の請求項１５では、上記発明において、前記制限制御手段は、前記第１の相関演算手段が相関演算を行う際に、前記第１および第２の制限手段による前記受信信号入力および変調信号出力を可能にさせ、前記第２の相関演算手段が相関演算を行う際に、前記第１および第２の制限手段による前記受信信号入力および変調信号出力を停止させることを特徴とする。
【００４２】
この発明によれば、第１の相関演算手段による相関演算の際には、受信信号入力と遅延信号出力を適切に行わせ、第２の相関演算手段による相関演算の際には、遅延信号出力の停止を適切に行わせる。
【００４３】
この発明の請求項１６では、上記発明において、前記無線中継装置は、前記増幅手段の利得を制御する利得制御手段をさらに備え、該利得制御手段は、遅延演算手段での遅延時間演算後に、前記増幅手段の利得を上げることを特徴とする。
【００４４】
この発明によれば、遅延時間演算後には、利得制御手段は、増幅手段の利得を上げて、受信信号通過を可能にする。
【００４５】
【発明の実施の形態】
以下に添付図面を参照して、この発明にかかる無線中継方法およびその装置の好適な実施の形態を説明する。
【００４６】
（実施例１）
図１は、この発明にかかる無線中継装置の実施例１の構成を示す構成図である。なお、以下の図において、図６と同様の構成部分に関しては、説明の都合上、同一符号を付記するものとする。
【００４７】
図において、この実施例は、例えば符号分割多元接続方式のように自己相関特性に特徴がある信号を用いた場合の構成例であり、増幅部１２と方向性結合器１３との間に遅延回路１８を接続させ、受信信号に１チップ、例えば拡散符号速度が４Ｍｃｈｉｐ／ｓｅｃの場合は２５０ｎｓｅｃ以上の遅延量を与えて、受信信号と干渉信号の相関をなくしている。
【００４８】
この他に、この実施例では、受信信号の入力を制限するスイッチ（ＳＷ）１と、送信信号の出力を制限するスイッチ（ＳＷ）２とを設け、相関演算器（ＤＰＳ）１９によってこれらＳＷ１，２の切り替え制御を行っている。すなわち、ＤＰＳ１９は、図１に示すように、受信アンテナ１０と方向性結合器１１とを接続させるとともに、方向性結合器１３と送信アンテナ１６とを接続させるために、これらＳＷ１，２をオン状態にする切り替え制御を行い、方向性結合器１３から分岐された干渉参照信号（信号▲１▼）と、空間を回り込んだ方向性結合器１１の出力信号（信号▲２▼）とを取り込む。さらに、ＤＰＳ１９は、この信号▲１▼と信号▲２▼との相関演算により、信号▲１▼に対する信号▲２▼の時間差Ａを求める。
【００４９】
また、このＤＰＳ１９は、方向性結合器１３と送信アンテナ１６との接続を断にするために、ＳＷ２をオフ状態にする切り替え制御を行い、上述した信号▲１▼と、干渉抑圧部１５を通過した方向性結合器１１の出力信号（信号▲３▼）とを取り込む。さらに、ＤＰＳ１９は、この信号▲１▼と信号▲３▼との相関演算により、信号▲１▼に対する信号▲３▼の時間差Ｂを求める。
【００５０】
そして、この求めた時間差Ａと時間差Ｂの差Ａ−Ｂが干渉波伝達経路の遅延量になるので、ＤＰＳ１９は、干渉抑圧部１５の遅延回路１５ａをこの遅延量に制御する。すなわち、ＤＰＳ１９は、方向性結合器１１からの入力ラインに対して時間をずらしながら信号を取り込むと、図２に示すように、ある時間で信号▲２▼と信号▲３▼の急峻な相関値が得られて相関がとれる。この信号▲２▼と信号▲３▼の時間差Ｔが干渉波伝達経路の遅延量になる。
【００５１】
したがって、ＤＰＳ１９は、これら時間をモニタし、その時間差分（信号▲２▼の相関値が立った時間から信号▲３▼の相関値が立った時間の差）だけ、遅延回路１５ａを調整して、信号▲３▼を遅延させることで、干渉参照信号を生成する。そして、この干渉参照信号を方向性結合器１１で受信信号に結合させることで、干渉信号をキャンセルする。
【００５２】
なお、干渉抑圧部１５は、この遅延回路１５ａと、可変位相器（ＰＳ）１５ｂと、可変減衰器（ＡＴＴ）１５ｃとから構成されており、ＤＰＳ１９は、このＰＳ１５ｂおよびＡＴＴ１５ｃの設定を可変制御して、入力する干渉参照信号の位相や振幅が、干渉信号と逆位相、同振幅になるように調整している。この他に、ＤＰＳ１９は、増幅部１２の利得の制御も行っている。
【００５３】
次に、この無線中継装置による干渉波の遅延時間検出のための動作を図３のフローチャートに基づいて説明する。図において、相関演算器１９は、まずＳＷ１，ＳＷ２をオン状態にするとともに、方向性結合器１１，１３間の主線系ライン（幹線）に接続発振が起こらない程度に増幅部１２の利得を下げて、増幅部１２の信号通過を阻止する利得制御を行う。さらに、相関演算器１９は、干渉抑圧部１５のＡＴＴ１５ｂを最大減衰量として、ＡＴＴ１５ｃの信号通過を阻止する（ステップ１０１）。
【００５４】
この状態で、方向性結合器１３から分岐された信号▲１▼と、空間を回り込んだ方向性結合器１１の信号▲２▼を取り込み、この信号▲１▼と信号▲２▼との相関演算を行い、信号▲１▼に対する信号▲２▼の時間差Ａ＝（信号▲２▼の相関値が立った時間）−（信号▲１▼の相関値が立った時間）を算出する（ステップ１０２）。
【００５５】
次に、ＳＷ２をオフ状態に切り替え制御して、干渉抑圧部１５のＡＴＴ１５ｃの減衰量をゼロにして、ＡＴＴ１５ｃでの信号通過を可能にする（ステップ１０３）。この状態で、方向性結合器１３から分岐された信号▲１▼と、干渉抑圧部１５を通過した方向性結合器１１の信号▲３▼を取り込み、この信号▲１▼と信号▲３▼との相関演算を行い、信号▲１▼に対する信号▲３▼の時間差Ｂ＝（信号▲３▼の相関が立った時間）−（信号▲１▼の相関値が立った時間）を算出する（ステップ１０４）。
【００５６】
そして、干渉波伝達経路の遅延時間Ａ−Ｂ＝（信号▲２▼の相関値が立った時間）−（信号▲３▼の相関が立った時間）を求める（ステップ１０５）。次に、干渉抑圧部１５の遅延回路１５ａにステップ１０５で求めた遅延時間Ａ−Ｂを設定し、ＳＷ１，ＳＷ２をオン状態にし、かつ増幅部１２の利得を上げて、増幅部１２への信号通過を可能にする（ステップ１０６）。
【００５７】
上記の制御工程と演算工程が終了すると、ＤＰＳ１９は、このＰＳ１５ｂおよびＡＴＴ１５ｃの設定を可変制御する運用モードに移行し、干渉抑圧部１５に入力する干渉参照信号の位相や振幅が、干渉信号と逆位相、同振幅になるように調整する（ステップ１０７）。
【００５８】
このように、この実施例では、方向性結合器１３で分岐された干渉参照信号（信号▲１▼）に対する空間を回り込んでくる方向性結合器１１の出力信号（信号▲２▼）および干渉抑圧部を通った方向性結合器１１の出力信号（信号▲３▼）との相関演算により、アンテナの回り込み干渉波伝達経路の遅延量を求めるので、この減衰量によって遅延された干渉参照信号で干渉信号をキャンセルし、特定周波数の電波を正確に受信できて、電波の受信精度を高めることができる。
【００５９】
また、この実施例では、干渉信号と干渉参照信号の相関演算を行うことで干渉波伝達経路の遅延量を求めることができるので、ＦＦＴなどの複雑な演算処理が不要となり、装置構成を簡易なものにすることができ、これにより製造コストを低減することができる。
【００６０】
また、この実施例では、ネットワークアナライザを用いる必要がないので、外部に無変調波を放出することがなくなるとともに、干渉波伝達経路長の正確な測定を行う必要がなく、ベースバンド帯域における相関演算を行うので、伝搬に使用する電波が高周波であってもなんら問題が生じることがない。
【００６１】
なお、この発明はこれに限らず、例えばノイズによっても相関をとることができる。この場合には、自装置内で生成されたノイズ、例えば周期性のないランダムなガウス雑音（正規化した白色雑音）の放射および取り込みを行っている。
【００６２】
そして、この実施例では、アンテナ１０から取り込まれたノイズを遅延および増幅させた後に、アンテナ１６に出力するとともに、アンテナ１６に出力されるノイズを方向性結合器１３で分岐し、アンテナ１０からのノイズとこの分岐されたノイズおよびこの分岐されたノイズと干渉抑圧部１５を通過したノイズとの相関演算を行うことで干渉波伝達経路の遅延量を求める。
【００６３】
すなわち、ノイズは、無限の繰り返し信号と考えることができるので、アンテナ１０からのノイズと分岐されたノイズが少しでも時間的にずれていると相関が取れなくなり、逆にアンテナ１０からのノイズと分岐されたノイズが時間的なずれがなく、一致している場合には、高い相関値が得られるので、この実施例では、実施例１と同様の効果を得ることができるとともに、さらに相関演算の精度を高めることができる。
【００６４】
また、この発明に用いるノイズは、周期性がないか、もしくは周期性が長ければ装置内外のいずれのノイズを用いても良い。ただし、ノイズは、アンテナ１０，１６で受信できることが可能な信号レベルであることが必要である。
【００６５】
さらに、この実施例では、例えばノイズを直交座標系に示すと、位相情報も、振幅情報も無限数の組み合わせとなり、一致性が極めて低いので、少ないサンプルで精度の良い相関演算が行えるとともに、移動局から基地局方向への電波に対する回り込みに対しても、各無線中継装置が独自にノイズを用いて相関演算を行うことができるので、移動局が送信を行っていない時でも相関をとることが可能となる。
【００６６】
（実施例２）
図４は、無線中継装置の実施例２の構成を示す構成図である。図において、この実施例では、遅延回路１８の代わりに、増幅部１２と方向性結合器１３間にスイッチ（ＳＷ）３を設けるとともに、このＳＷ３を介して変調信号発振器（ＳＧ）２１が方向性結合器１３へ変調信号を出力する構成になっている。
【００６７】
すなわち、この実施例では、外部からの受信信号の代わりに内部のＳＧ２１から出力される変調信号を用いて、各信号▲１▼〜▲３▼を出力させてこれら信号間での相関演算を行うものである。
【００６８】
次に、この無線中継装置による干渉波の遅延時間検出のための動作を図５のフローチャートに基づいて説明する。図において、相関演算器１９は、まずＳＷ１，ＳＷ２をオン状態にし、かつＳＷ３をＳＧ２１側に切り替えてＳＧ２１と方向性結合器１３を接続させるとともに、方向性結合器１１，１３間の主線系ライン（幹線）に接続発振が起こらない程度に増幅部１２の利得を下げて、増幅部１２の信号通過を阻止する利得制御を行う。さらに、相関演算器１９は、干渉抑圧部１５のＡＴＴ１５ｂを最大減衰量として、ＡＴＴ１５ｃの信号通過を阻止する（ステップ２０１）。
【００６９】
この状態で、ＳＧ２１から変調信号を出力し、方向性結合器１３から分岐された信号▲１▼と、空間を回り込んだ方向性結合器１１の信号▲２▼を取り込み、この信号▲１▼と信号▲２▼との相関演算を行い、信号▲１▼に対する信号▲２▼の時間差Ａ＝（信号▲２▼の相関値が立った時間）−（信号▲１▼の相関値が立った時間）を算出する（ステップ２０２）。
【００７０】
次に、ＳＷ１とＳＷ２をオフ状態に切り替え制御して、干渉抑圧部１５のＡＴＴ１５ｃの減衰量をゼロにして、ＡＴＴ１５ｃの信号通過を可能にする（ステップ２０３）。この状態で、方向性結合器１３から分岐された信号▲１▼と、干渉抑圧部１５を通過した方向性結合器１１の信号▲３▼を取り込み、この信号▲１▼と信号▲３▼との相関演算を行い、信号▲１▼に対する信号▲３▼の時間差Ｂ＝（信号▲３▼の相関が立った時間）−（信号▲１▼の相関値が立った時間）を算出する（ステップ２０４）。
【００７１】
そして、干渉波伝達経路の遅延時間Ａ−Ｂ＝（信号▲２▼の相関値が立った時間）−（信号▲３▼の相関が立った時間）を求める（ステップ２０５）。次に、干渉抑圧部１５の遅延回路１５ａにステップ２０５で求めた遅延時間Ａ−Ｂを設定し、ＳＷ１，ＳＷ２をオン状態にし、かつＳＷ３を主線系ラインに切り替えて増幅部１２と方向性結合器１３を接続させるとともに、増幅部１２の利得を上げて、増幅部１２での信号通過を可能にする（ステップ２０６）。
【００７２】
上記の制御工程と演算工程が終了すると、ＤＰＳ１９は、このＰＳ１５ｂおよびＡＴＴ１５ｃの設定を可変制御する運用モードに移行し、干渉抑圧部１５に入力する干渉参照信号の位相や振幅が、干渉信号と逆位相、同振幅になるように調整する（ステップ２０７）。
【００７３】
このように、この実施例では、内部に変調信号を送信するＳＧを設け、この変調信号の出力によって得られる方向性結合器１３で分岐された干渉参照信号（信号▲１▼）に対する空間を回り込んでくる方向性結合器１１の出力信号（信号▲２▼）および干渉抑圧部を通った方向性結合器１１の出力信号（信号▲３▼）との相関演算により、アンテナの回り込み干渉波伝達経路の遅延量を求めるので、この遅延された干渉参照信号をキャンセルし、特定周波数の電波を正確に受信できて、電波の受信精度を高めることができるとともに、実施例１と同様の効果を得ることができる。
【００７４】
この発明は、これらの実施形態に限定されるものではなく、この発明の要旨を逸脱しない範囲で種々の変形実施が可能である。例えば、これら実施例では、ＡＴＴの減衰量を制御して干渉抑圧部の干渉参照信号通過の有無を設定したが、この発明はこれに限らず、スイッチのオン／オフ制御によって信号通過の有無を設定しても良い。
【００７５】
【発明の効果】
以上説明したように、この発明の請求項１では、第１のアンテナから受信された受信信号を増幅および遅延して第２のアンテナから送信するとともに、前記受信信号を分岐して干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継方法において、分岐された受信信号と遅延された遅延信号との相関演算を行うとともに、遅延信号と干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算するので、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上できる。
【００７６】
この発明の請求項２では、第１のアンテナから受信された受信信号を増幅して第２のアンテナから送信するとともに、前記受信信号を分岐して干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継方法において、この変調信号と受信信号との相関演算を行うとともに、変調信号と干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算するので、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波を抑圧し、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上できる。
【００７７】
この発明の請求項３では、第１のアンテナから受信された受信信号を増幅手段で増幅し、かつ遅延手段で遅延させた後、第２のアンテナから送信するとともに、前記遅延後に分岐手段で前記遅延信号を分岐させ、該遅延信号から干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継装置において、分岐された遅延信号に対する分岐結合手段で分岐された受信信号および干渉参照信号との相関演算を行い、これらの演算結果から干渉波伝達経路の遅延時間を求めるので、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波をキャンセルし、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上できる。
【００７８】
この発明の請求項４，５では、制限制御手段によって第１および第２の制限手段を制御し、第１の相関演算手段による相関演算の際には、受信信号入力と遅延信号出力を適切に行わせ、第２の相関演算手段による相関演算の際には、遅延信号出力の停止を適切に行わせることで、相関演算に必要な信号を適切に取り込むことが可能となる。
【００７９】
この発明の請求項６では、遅延時間演算後に、制限制御手段による制限手段の制御で第２のアンテナへの送信信号出力を再開させて、干渉参照信号の位相と振幅を制御する運用モードに移行して、受信信号から干渉参照信号を生成し、この干渉参照信号によって空間を回り込んでくる干渉信号をキャンセルするので、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上できる。
【００８０】
この発明の請求項７〜９では、利得制御手段が増幅手段の利得を制御し、第１の相関演算手段による相関演算の際には、増幅手段の利得を下げるので、増幅手段の信号通過を阻止することができ、遅延時間演算後には、増幅手段の利得を上げるので、受信信号通過が可能になる。
【００８１】
この発明の請求項１０では、ノイズを用いて相関演算を行うので、相関がとれると急峻な相関値が得られ、精度良く相関演算を行うことができ、これにより干渉波による影響を防ぐことができる。
【００８２】
この発明の請求項１１では、第１のアンテナから受信された受信信号を増幅手段で増幅させた後、第２のアンテナから送信するとともに、前記増幅後に分岐手段で前記受信信号を分岐させ、該受信信号から干渉参照信号を抽出して、前記第２のアンテナから前記第１のアンテナに回り込む干渉波を抑圧する無線中継装置において、内部から変調信号を出力して、分岐された変調信号に対する分岐結合手段で分岐された受信信号および干渉参照信号との相関演算を行い、これらの演算結果から干渉波の伝達経路の遅延時間を演算するので、アンテナの回り込み干渉波伝達経路の遅延量を正確に求めて、同一遅延量の干渉参照信号を生成してこの干渉波を抑圧し、特定周波数の電波を正確に受信して、電波の受信精度を高めて伝送効率を向上できる。
【００８３】
この発明の請求項１２，１３では、相関演算および信号遅延を行う際に、前記増幅された受信信号と変調信号の入力切り替えを切替制御手段が行っており、第１および第２の相関演算手段による相関演算の際には、変調信号を取り込み、遅延制御手段による信号遅延の際には、増幅された受信信号を取り込むので、それぞれの場合に応じて適切な信号入力を行うことができる。
【００８４】
この発明の請求項１４，１５では、相関演算を行う際に、前記第１および第２の制限手段を制限制御手段が制御しており、第１の相関演算手段による相関演算の際には、受信信号入力と遅延信号出力を行わせ、第２の相関演算手段による相関演算の際には、遅延信号出力を行わせるので、それぞれの相関演算に応じて適切な信号を選択できる。
【００８５】
この発明の請求項１６では、遅延時間演算後に、増幅手段の利得を上げるように利得制御手段が制御するので、増幅手段の受信信号通過が可能になる。
【図面の簡単な説明】
【図１】この発明にかかる無線中継装置の実施例１の構成を示す構成図である。
【図２】図１に示した信号▲２▼と信号▲３▼の遅延時間を示す相関特性の特性図である。
【図３】図１に示した無線中継装置による干渉波の遅延時間検出のための動作を説明するフローチャートである。
【図４】この発明にかかる無線中継装置の実施例２の構成を示す構成図である。
【図５】図５に示した無線中継装置による干渉波の遅延時間検出のための動作を説明するフローチャートである。
【図６】従来の無線中継装置の構成の一例を示す構成図である。
【図７】同じく、無線中継装置の構成の他の例を示す構成図である。
【符号の説明】
１〜３　スイッチ（ＳＷ）
１０　受信アンテナ
１１，１３　方向性結合器
１２　増幅部
１４　ネットワークアナライザ
１５　干渉抑圧部
１５ａ，１８　遅延回路
１５ｂ　ＰＳ
１５ｃ　ＡＴＴ
１６　送信アンテナ
１７　リプル検出部・ＦＦＴ演算部
１９　相関演算器
２１　ＳＧ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a radio relay method and apparatus for amplifying and relaying a received desired wave, and more particularly, to a radio relay method and a radio relay method of suppressing an interference wave wrapping around from one antenna to another antenna and performing radio relay of the desired wave. It concerns the device.
[0002]
[Prior art]
Conventional wireless relay devices are used, for example, between radio base stations for mobile communications and mobile stations for mobile phones, even in mountainous areas or plains, in buildings or in tunnels where radio waves cannot reach. Have been. As such a wireless relay device, there is a repeater device using a code division multiple access system or a code division multiplex system, and the repeater device is installed on a hill or a roof of a building where radio waves from a base station can reach. Radio relay of a desired wave between the base station and the mobile station has been performed via the transmission / reception antenna for the base station and the transmission / reception antenna for the mobile station. Normally, these antennas need to be installed at a sufficiently distant place so that radio waves relayed and transmitted from one antenna are not re-received by the other antenna.
[0003]
However, as a countermeasure in places where radio waves are difficult to reach, such as the shadow of a building, when installing a repeater device on the roof of a building, the antenna for the base station and the antenna for the mobile station must be installed in consideration of the installation space. There are cases where it is desired to install the device in a close place. In this case, a radio wave transmitted from one antenna goes around to the other antenna. Since the re-received radio wave (interference wave) has the same frequency as the desired wave, the wraparound received signal becomes an interference signal and affects the relay of the repeater device, and the transmission efficiency of the desired wave decreases. Cause.
[0004]
Therefore, in order to solve this problem, there has conventionally been a method of creating an interference suppression wave and canceling the interfering interference wave. The information required to create this interference suppression wave includes the amount of change in the phase and amplitude of the interference wave transmission path. If the frequency band occupied by the interference wave is wide, the amount of delay of this interference wave Information is also required.
[0005]
As a method of detecting the delay amount of the interference wave transmission path, for example, as shown in FIG. 6, there is a method of directly measuring the delay amount of the interference wave transmission path using a network analyzer. In FIG. 6, two directional couplers 11 and 13 and an amplifying unit 12 are connected between the receiving antenna 10 and the transmitting antenna 16, and a network analyzer 14 is provided between the directional couplers 11 and 13 via another path. The network analyzer 14 is used to determine the delay amount of the interference wave transmission path using the network analyzer 14. Further, an interference suppressing unit 15 is connected to the directional coupling units 13 and 11.
[0006]
In this conventional example, a received signal received by a receiving antenna 10 is amplified by an amplifier 12 and transmitted from a transmitting antenna 16 via a directional coupler 13, and the received signal is branched by a directional coupler 13. Is done. In the interference suppression unit 15, after the delay amount of the received signal is adjusted, the phase and the amplitude are further adjusted and are combined with the received signal by the directional coupler 11.
[0007]
An unmodulated signal is output from the network analyzer 14, and the unmodulated signal is transmitted from the transmitting antenna 16 via the directional coupler 13. At this time, the gain of the amplifying unit 12 is lowered so that the passage of a signal is blocked by the amplifying unit 12. This unmodulated wave propagates in space and is taken into the receiving antenna 10 as an interference wave. The received interference signal is detected by the directional coupler 11 and taken into the network analyzer 14, where the delay amount of the interference wave transmission path is measured. The delay amount measured by the network analyzer 14 is set in a delay circuit (not shown) of the interference suppression unit 15. The interference suppression unit 15 generates an interference reference signal having a predetermined delay amount based on this information. Then, the interference signal is canceled by coupling to the reception signal from the reception antenna 10. That is, the interference suppression unit 15 generates an interference wave suppression signal of the same phase and amplitude with the same delay amount as the interference signal, and the directional coupler 11 adds the interference wave suppression signal to the received signal, thereby providing a sneak path. The interference signal was canceled.
[0008]
As another method, for example, when the path length of an interference wave transmission path can be easily measured, there is a method of calculating a delay time from the path length and the transmission speed of the interference wave. Further, in a system having a characteristic that a desired wave generates a ripple waveform in a frequency vs. amplitude characteristic by an interference wave in an occupied frequency band, as shown in FIG. This ripple is taken out by a ripple detection unit / FFT calculation unit 17 connected to the FFT unit, and the extracted waveform is regarded as a time waveform and subjected to a Fourier transform, so that a component delayed with respect to a desired wave is taken out and an interference wave transmission path is obtained. The amount of delay was determined.
[0009]
[Problems to be solved by the invention]
However, in the first method of the above-mentioned conventional example, since the unmodulated wave used in the network analyzer propagates in the space, it is necessary to obtain a license for transmitting the unmodulated wave due to radio laws and regulations. There is a problem that it is difficult to arrange such a qualified person at every relay station where the wireless relay device is installed.
[0010]
Further, in the second method, if the interference wave transmission distance is long or the path length includes reflection by an obstacle, it is very difficult to accurately measure the path length of the interference wave transmission path. There was a problem of becoming. Also, in this method, the higher the frequency of the radio wave used for propagation, the shorter its wavelength, so that the measurement accuracy of the path length becomes extremely high and the measurement becomes more difficult.
[0011]
In the third method, the extracted ripple waveform is regarded as a time waveform, and it is necessary to perform arithmetic processing such as fast Fourier transform. Therefore, there is a problem that the device configuration is complicated and expensive.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and accurately determines a delay amount of a wraparound interference wave transmission path of an antenna, generates an interference reference signal having the same delay amount, cancels the interference wave, and sets a specific frequency. It is an object of the present invention to accurately receive a radio wave, and improve the reception accuracy of the radio wave to improve the transmission efficiency.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a received signal received from a first antenna is amplified and delayed and transmitted from a second antenna, and the received signal is branched to obtain an interference reference signal. In the wireless relay method for suppressing an interference wave circulating from the second antenna to the first antenna, performing a correlation operation between the branched received signal and the delayed signal. A correlation operation step, a first stop step of stopping transmission signal output to the second antenna, a generation step of generating the interference reference signal from the delay signal, and a step of generating the interference reference signal. A second correlation operation step of performing a correlation operation; a delay operation step of calculating a delay time of the transmission path of the interference wave from the operation results of the first and second correlation operation steps; Radio relay method which comprises a delay control step of delaying said interference reference signal is provided based on the length of time.
[0014]
According to the present invention, a correlation operation between the branched reception signal and the delayed delay signal is performed, and a correlation operation between the delay signal and the interference reference signal is performed. By calculating the time, the amount of delay in the transmission path of the interfering interference wave of the antenna is accurately obtained, an interference reference signal having the same amount of delay is generated, the interference wave is canceled, and the radio wave of a specific frequency is accurately received. Therefore, the transmission efficiency is improved by increasing the accuracy of radio wave reception.
[0015]
According to a second aspect of the present invention, the received signal received from the first antenna is amplified and transmitted from the second antenna, and the received signal is branched to extract an interference reference signal. In a wireless relay method for suppressing an interference wave circulating from an antenna to the first antenna, a signal output step of outputting a modulated signal to the second antenna, a branch step of branching the output modulated signal, A first correlation operation step of performing a correlation operation between the divided received signal and the split modulated signal, and a first correlation operation step of stopping a reception signal input from the first antenna and a transmission signal output to the second antenna. A stopping step, a generating step of generating the interference reference signal from the modulated signal, a second correlation calculating step of performing a correlation calculation between the output modulated signal and the interference reference signal, And a delay calculation step of calculating a delay time of the transmission path of the interference wave from a calculation result in the second correlation calculation step; and a delay control step of delaying the interference reference signal based on the calculated delay time. A wireless relay method is provided.
[0016]
According to the present invention, a modulation signal is output from the inside, a correlation operation between the modulation signal and the reception signal is performed, and a correlation operation between the modulation signal and the interference reference signal is performed. By calculating the delay time of the transmission path, the delay amount of the wraparound interference wave transmission path of the antenna is accurately obtained, an interference reference signal having the same delay amount is generated, this interference wave is canceled, and a radio wave of a specific frequency is transmitted. Receives accurately, improves the reception accuracy of radio waves, and improves transmission efficiency.
[0017]
According to a third aspect of the present invention, after the received signal received from the first antenna is amplified by the amplifying means and delayed by the delay means, the signal is transmitted from the second antenna, and after the delay, the signal is divided by the branching means. In a wireless relay device for splitting a delay signal, extracting an interference reference signal from the delay signal, and suppressing an interference wave wrapping around from the second antenna to the first antenna, a reception signal from the first antenna First limiting means for limiting input, second limiting means for limiting delay signal output to the second antenna, and branching a received signal received by the first antenna from a trunk line, Coupling means for coupling a signal to be received to the received signal on the main line, and first correlation operation means for performing a correlation operation between the reception signal branched by the branch coupling means and the branched delay signal Generating means for generating the interference reference signal from the branched delay signal; second correlation calculating means for performing a correlation calculation between the branched delay signal and the interference reference signal; And delay control means for delaying the interference reference signal based on the calculated delay time based on the calculation result of the correlation calculation means. A wireless relay device is provided.
[0018]
According to the present invention, by performing a correlation operation on the branched delay signal with the received reference signal and the interference reference signal branched by the branching and coupling means, and determining the delay time of the interference wave transmission path from these calculation results, the antenna Accurately determine the amount of delay in the transmission path of wraparound interference waves, generate interference reference signals with the same amount of delay, suppress this interference wave, accurately receive radio waves of a specific frequency, and improve the reception accuracy of radio waves. To improve transmission efficiency.
[0019]
According to a fourth aspect of the present invention, in the above invention, the wireless relay device further includes a restriction control unit that controls the first and second restriction units when performing the correlation operation.
[0020]
According to the present invention, at the time of the correlation calculation by the first and second correlation calculation means, the signal necessary for the correlation calculation is appropriately captured by controlling the first and second restriction means by the limit control means. Make it possible.
[0021]
According to a fifth aspect of the present invention, in the above invention, when the first correlation operation means performs a correlation operation, the restriction control means controls the reception signal input and the delay signal input by the first and second restriction means. The output is enabled, and the output of the delayed signal by the second limiting unit is stopped when the second correlation operation unit performs the correlation operation.
[0022]
According to the present invention, the input of the received signal and the output of the delay signal are appropriately performed at the time of the correlation operation by the first correlation operation means, and the output of the delay signal is performed at the time of the correlation operation by the second correlation operation means. Stopping is performed appropriately.
[0023]
According to a sixth aspect of the present invention, in the above invention, the limit control means enables the first and second limit means to input the received signal and output the delayed signal after the delay time calculation by the delay calculation means. It is characterized by the following.
[0024]
According to the present invention, when the delay time is calculated, the operation mode is shifted to the operation mode for controlling the phase and the amplitude of the interference reference signal, the interference reference signal is generated from the delay signal, and the space is wrapped by the interference reference signal. Cancel the interfering signal that comes out.
[0025]
According to a seventh aspect of the present invention, in the above invention, the wireless relay device further comprises a gain control means for controlling a gain of the amplifying means when performing the correlation operation.
[0026]
According to the present invention, the gain control means performs the gain control so that the gain of the amplifying means becomes optimum during the correlation calculation.
[0027]
According to an eighth aspect of the present invention, in the above invention, the gain control means reduces the gain of the amplification means when the first correlation calculation means performs the correlation calculation.
[0028]
According to the present invention, at the time of the correlation calculation by the first correlation calculation means, the gain control means lowers the gain of the amplification means to such an extent that the connection oscillation does not occur on the main line, and prevents the signal passage of the amplification means. .
[0029]
According to a ninth aspect of the present invention, in the above invention, the gain control means increases the gain of the amplifying means after calculating the delay time by the delay calculating means.
[0030]
According to the present invention, after calculating the delay time, the gain control means increases the gain of the amplifying means to allow the reception signal to pass.
[0031]
According to a tenth aspect of the present invention, in the above-mentioned invention, the reception signal received from the first antenna comprises noise generated from the own device.
[0032]
According to the present invention, after delaying and amplifying noise generated in the own device and taken in from the first antenna, the noise is output to the second antenna and the noise output to the second antenna is branched. Then, a correlation operation between the noise from the first antenna and the branched noise is performed.
[0033]
According to an eleventh aspect of the present invention, after the received signal received from the first antenna is amplified by the amplifying unit, the signal is transmitted from the second antenna, and after the amplification, the received signal is branched by the branching unit. In a wireless relay device that extracts an interference reference signal from a received signal and suppresses an interference wave that wraps around from the second antenna to the first antenna, a first signal for limiting a received signal input from the first antenna Limiting means, second limiting means for limiting output of a transmission signal to the second antenna, signal output means for outputting a modulated signal to the second antenna, and branching for splitting the output modulated signal Means, branching means for branching a received signal received by the first antenna from a main line, and coupling an input signal to the received signal, and branching by the branching and coupling means. First correlation calculating means for performing a correlation calculation between the received signal and the modulated signal, generating means for generating the interference reference signal from the modulated signal, and performing a correlation calculation between the modulated signal and the interference reference signal A second correlation calculating means, a delay calculating means for calculating a delay time of the transmission path of the interference wave from a calculation result of the first and second correlation calculating means, and And a delay control means for delaying the interference reference signal.
[0034]
According to the present invention, a modulated signal is output from the inside, and a correlation operation is performed on the branched modulated signal with the received signal and the interference reference signal that are branched by the branching / coupling means. By calculating the delay time of the path, the amount of delay in the transmission path of the interfering interference wave of the antenna is accurately obtained, an interference reference signal having the same delay amount is generated, the interference wave is canceled, and the radio wave of a specific frequency is accurately obtained. To improve the reception efficiency of the radio wave to improve the transmission efficiency.
[0035]
According to a twelfth aspect of the present invention, in the above invention, the wireless relay device further includes a switching control unit that performs input switching between the amplified received signal and the modulated signal when performing the correlation operation. And
[0036]
According to the present invention, at the time of the correlation calculation by the first and second correlation calculation means, it is possible to appropriately input a signal necessary for the correlation calculation by the switching control means.
[0037]
According to a thirteenth aspect of the present invention, in the above invention, the switching control means captures the modulation signal when the first and second correlation calculation means perform a correlation calculation, and the delay control means sets a signal delay. When performing, the amplified reception signal is taken in.
[0038]
According to the present invention, the modulation signal input is appropriately performed at the time of the correlation calculation by the first and second correlation calculation means, and the amplified received signal input is changed at the time of the signal delay by the delay control means. Let them do it properly.
[0039]
According to a fourteenth aspect of the present invention, in the above invention, the wireless relay device further includes a restriction control unit that controls the first and second restriction units when performing the correlation operation. .
[0040]
According to the present invention, at the time of the correlation calculation by the first and second correlation calculation means, the signal necessary for the correlation calculation is appropriately captured by controlling the first and second restriction means by the limit control means. Make it possible.
[0041]
According to a fifteenth aspect of the present invention, in the above invention, when the first correlation operation means performs the correlation operation, the restriction control means controls the reception signal input and the modulation signal by the first and second restriction means. An output is enabled, and when the second correlation operation unit performs the correlation operation, the reception signal input and the modulation signal output by the first and second restriction units are stopped.
[0042]
According to this invention, the input of the received signal and the output of the delayed signal are appropriately performed at the time of the correlation operation by the first correlation operation means, and the output of the delayed signal is performed at the time of the correlation operation by the second correlation operation means. Stopping is performed appropriately.
[0043]
According to claim 16 of the present invention, in the above invention, the wireless relay device further comprises a gain control means for controlling a gain of the amplifying means, and the gain control means, after calculating a delay time by the delay calculating means, The gain of the amplifying means is increased.
[0044]
According to the present invention, after calculating the delay time, the gain control means increases the gain of the amplifying means to allow the reception signal to pass.
[0045]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a wireless relay method and an apparatus thereof according to the present invention will be described with reference to the accompanying drawings.
[0046]
(Example 1)
FIG. 1 is a configuration diagram illustrating a configuration of a wireless relay device according to a first embodiment of the present invention. In the following drawings, the same components as those in FIG. 6 are denoted by the same reference numerals for convenience of explanation.
[0047]
In the figure, this embodiment is an example of a configuration in which a signal having an autocorrelation characteristic is used, such as a code division multiple access system, and a delay circuit is provided between an amplifier 12 and a directional coupler 13. 18, the received signal is given one chip, for example, if the spreading code rate is 4 Mchip / sec, a delay amount of 250 nsec or more is given to eliminate the correlation between the received signal and the interference signal.
[0048]
In addition, in this embodiment, a switch (SW) 1 for limiting the input of the reception signal and a switch (SW) 2 for limiting the output of the transmission signal are provided. 2 switching control. That is, as shown in FIG. 1, the DPS 19 connects the receiving antenna 10 and the directional coupler 11 and connects the directional coupler 13 and the transmitting antenna 16 so that the SW 1 and SW 2 are turned on. Is performed, and the interference reference signal (signal {circle around (1)}) branched from the directional coupler 13 and the output signal (signal {circle around (2)}) of the directional coupler 11 wrapping around the space are fetched. Further, the DPS 19 obtains a time difference A between the signal (1) and the signal (2) by performing a correlation operation between the signal (1) and the signal (2).
[0049]
Further, the DPS 19 performs switching control for turning off the SW 2 to disconnect the connection between the directional coupler 13 and the transmission antenna 16, and passes the signal (1) described above and the signal passing through the interference suppression unit 15. And the output signal of the directional coupler 11 (signal (3)). Further, the DPS 19 obtains a time difference B between the signal (1) and the signal (3) by performing a correlation operation between the signal (1) and the signal (3).
[0050]
Then, the difference AB between the obtained time difference A and the time difference B becomes the delay amount of the interference wave transmission path, so that the DPS 19 controls the delay circuit 15a of the interference suppression unit 15 to this delay amount. That is, when the DPS 19 captures a signal while shifting the time with respect to the input line from the directional coupler 11, as shown in FIG. 2, the steep correlation value between the signal (2) and the signal (3) at a certain time, as shown in FIG. And a correlation can be obtained. The time difference T between the signal (2) and the signal (3) becomes the delay amount of the interference wave transmission path.
[0051]
Therefore, the DPS 19 monitors these times, and adjusts the delay circuit 15a by the time difference (the difference between the time when the correlation value of the signal (2) rises and the time when the correlation value of the signal (3) rises). , Signal (3) to generate an interference reference signal. Then, the interference reference signal is combined with the received signal by the directional coupler 11 to cancel the interference signal.
[0052]
The interference suppressor 15 includes a delay circuit 15a, a variable phase shifter (PS) 15b, and a variable attenuator (ATT) 15c. The DPS 19 variably controls the settings of the PS 15b and the ATT 15c. Thus, the phase and amplitude of the input interference reference signal are adjusted so as to have the opposite phase and the same amplitude as the interference signal. In addition, the DPS 19 also controls the gain of the amplifier 12.
[0053]
Next, the operation of the wireless relay device for detecting the delay time of the interference wave will be described with reference to the flowchart of FIG. In the figure, a correlation calculator 19 first turns on SW1 and SW2, and lowers the gain of the amplifying unit 12 to such an extent that no connection oscillation occurs in the main line (main line) between the directional couplers 11 and 13. Thus, gain control for preventing the signal from passing through the amplification unit 12 is performed. Further, the correlation calculator 19 sets the ATT 15b of the interference suppression unit 15 as the maximum attenuation and prevents the ATT 15c from passing the signal (step 101).
[0054]
In this state, the signal (1) branched from the directional coupler 13 and the signal (2) of the directional coupler 11 wrapping around the space are fetched, and the correlation between the signal (1) and the signal (2) is obtained. An arithmetic operation is performed to calculate a time difference A of the signal (2) with respect to the signal (1) = (time when the correlation value of the signal (2) rises)-(time when the correlation value of the signal (1) rises) (step 102). ).
[0055]
Next, SW2 is controlled to be turned off, the attenuation of the ATT 15c of the interference suppression unit 15 is set to zero, and the signal can be passed through the ATT 15c (step 103). In this state, the signal (1) branched from the directional coupler 13 and the signal (3) of the directional coupler 11 that has passed through the interference suppression unit 15 are fetched, and the signals (1) and (3) are obtained. Is calculated, and a time difference B of the signal (3) with respect to the signal (1) = (the time when the correlation of the signal (3) is raised) − (the time when the correlation value of the signal (1) is raised) is calculated (step). 104).
[0056]
Then, the delay time AB of the interference wave transmission path = (the time when the correlation value of the signal (2) rises)-(the time when the correlation of the signal (3) rises) is obtained (step 105). Next, the delay time AB obtained in step 105 is set in the delay circuit 15a of the interference suppression unit 15, SW1 and SW2 are turned on, and the gain of the amplification unit 12 is increased. Allow passage (step 106).
[0057]
When the above control step and calculation step are completed, the DPS 19 shifts to an operation mode in which the settings of the PS 15b and the ATT 15c are variably controlled, and the phase and amplitude of the interference reference signal input to the interference suppression unit 15 are opposite to those of the interference signal. The phase and the amplitude are adjusted (step 107).
[0058]
As described above, in this embodiment, the output signal (signal (2)) of the directional coupler 11 and the interference signal that wrap around the space with respect to the interference reference signal (signal (1)) branched by the directional coupler 13 By calculating the correlation with the output signal (signal {circle around (3)}) of the directional coupler 11 that has passed through the suppression unit, the delay amount of the loop interference wave transmission path of the antenna is obtained. The interference signal can be canceled, the radio wave of the specific frequency can be accurately received, and the reception accuracy of the radio wave can be improved.
[0059]
Further, in this embodiment, since the delay amount of the interference wave transmission path can be obtained by performing the correlation operation between the interference signal and the interference reference signal, complicated arithmetic processing such as FFT becomes unnecessary, and the apparatus configuration can be simplified. And thereby reduce manufacturing costs.
[0060]
Further, in this embodiment, since it is not necessary to use a network analyzer, an unmodulated wave is not emitted to the outside, and it is not necessary to accurately measure the transmission path length of the interference wave. Therefore, no problem occurs even if the radio wave used for propagation is a high frequency.
[0061]
The present invention is not limited to this. For example, the correlation can be obtained by noise. In this case, noise generated in the own device, for example, random Gaussian noise having no periodicity (normalized white noise) is emitted and captured.
[0062]
In this embodiment, after the noise taken from the antenna 10 is delayed and amplified, the noise is output to the antenna 16, and the noise output to the antenna 16 is branched by the directional coupler 13, and By performing a correlation operation between the noise, the branched noise, and the noise that has passed through the interference suppression unit 15, the delay amount of the interference wave transmission path is obtained.
[0063]
That is, since the noise can be considered as an infinitely repeated signal, if the noise from the antenna 10 and the branched noise are slightly shifted in time, the correlation will not be obtained, and conversely, the noise from the antenna 10 will not be branched. In the case where the obtained noises have no time lag and coincide with each other, a high correlation value can be obtained. Therefore, in this embodiment, the same effect as in the first embodiment can be obtained, and furthermore, the correlation calculation can be performed. Accuracy can be increased.
[0064]
The noise used in the present invention may have no periodicity or may be any noise inside or outside the device as long as the periodicity is long. However, the noise needs to be at a signal level that can be received by the antennas 10 and 16.
[0065]
Further, in this embodiment, for example, when noise is shown in a rectangular coordinate system, both the phase information and the amplitude information are an infinite number of combinations, and the coincidence is extremely low. Each radio relay device can independently perform a correlation operation using noise even when the radio wave is diverted from the station to the base station, so that the correlation can be obtained even when the mobile station is not transmitting. It becomes possible.
[0066]
(Example 2)
FIG. 4 is a configuration diagram illustrating a configuration of the wireless relay device according to the second embodiment. In this figure, in this embodiment, a switch (SW) 3 is provided between the amplifying unit 12 and the directional coupler 13 in place of the delay circuit 18, and a modulation signal oscillator (SG) 21 is directional via this SW3. The configuration is such that the modulation signal is output to the coupler 13.
[0067]
That is, in this embodiment, the signals {1} to {3} are output using the modulation signal output from the internal SG 21 instead of the external reception signal, and the correlation operation between these signals is performed. Things.
[0068]
Next, the operation of the wireless relay device for detecting the delay time of the interference wave will be described with reference to the flowchart of FIG. In the figure, a correlation calculator 19 first turns on SW1 and SW2, switches SW3 to the SG21 side to connect the SG21 to the directional coupler 13, and also sets a main line between the directional couplers 11 and 13. The gain of the amplifying unit 12 is reduced to such an extent that connection oscillation does not occur on the (main line), and gain control is performed to prevent the signal from passing through the amplifying unit 12. Further, the correlation calculator 19 sets the ATT 15b of the interference suppression unit 15 as the maximum attenuation and prevents the ATT 15c from passing the signal (step 201).
[0069]
In this state, a modulated signal is output from the SG 21 and the signal (1) branched from the directional coupler 13 and the signal (2) of the directional coupler 11 wrapping around the space are taken in. This signal (1) And the signal (2) is correlated, and the time difference A between the signal (2) and the signal (1) is A = (the time when the correlation value of the signal (2) is raised)-(the correlation value of the signal (1) is raised). ) Is calculated (step 202).
[0070]
Next, SW1 and SW2 are controlled to be turned off, the attenuation of the ATT 15c of the interference suppression unit 15 is set to zero, and the signal transmission of the ATT 15c is enabled (step 203). In this state, the signal (1) branched from the directional coupler 13 and the signal (3) of the directional coupler 11 that has passed through the interference suppression unit 15 are fetched, and these signals (1) and (3) are obtained. Is calculated, and the time difference B of the signal (3) with respect to the signal (1) = (the time when the correlation of the signal (3) is raised) − (the time when the correlation value of the signal (1) is raised) is calculated (step). 204).
[0071]
Then, the delay time AB of the interference wave transmission path is obtained (the time when the correlation value of the signal (2) rises)-(the time when the correlation of the signal (3) rises) (step 205). Next, the delay time AB obtained in step 205 is set in the delay circuit 15a of the interference suppressor 15, SW1 and SW2 are turned on, and SW3 is switched to the main line to switch the directional coupling with the amplifier 12. The amplifier 13 is connected, and the gain of the amplifying unit 12 is increased to allow the signal to pass through the amplifying unit 12 (step 206).
[0072]
When the control step and the calculation step are completed, the DPS 19 shifts to an operation mode in which the settings of the PS 15b and the ATT 15c are variably controlled, and the phase and amplitude of the interference reference signal input to the interference suppression unit 15 are opposite to those of the interference signal. The phase and the amplitude are adjusted (step 207).
[0073]
As described above, in this embodiment, the SG for transmitting the modulated signal is provided inside, and the SG for the interference reference signal (signal {circle around (1)}) branched by the directional coupler 13 obtained by the output of the modulated signal is turned around. By performing a correlation operation between the output signal (signal {circle around (2)) of the directional coupler 11 and the output signal (signal {circle over (3)}) of the directional coupler 11 that has passed through the interference suppression unit, transmission of a wraparound interference wave from the antenna is performed. Since the delay amount of the path is obtained, the delayed interference reference signal is canceled, the radio wave of the specific frequency can be accurately received, the reception accuracy of the radio wave can be improved, and the same effect as in the first embodiment is obtained. be able to.
[0074]
The present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. For example, in these embodiments, the presence / absence of the passage of the interference reference signal of the interference suppression unit is set by controlling the amount of attenuation of the ATT. However, the present invention is not limited to this, and the presence / absence of the passage of the signal is controlled by on / off control of the switch. May be set.
[0075]
【The invention's effect】
As described above, according to claim 1 of the present invention, while amplifying and delaying a received signal received from the first antenna and transmitting the amplified signal from the second antenna, the received signal is branched to form an interference reference signal. In a wireless relay method for extracting and suppressing an interference wave wrapping around from the second antenna to the first antenna, a correlation operation between a branched received signal and a delayed delayed signal is performed, and interference between the delayed received signal and the delayed signal is performed. Correlation calculation with the reference signal is performed, and the delay time of the transmission path of the interference wave is calculated from these calculation results. Therefore, the delay amount of the transmission path of the interference interference wave of the antenna is accurately obtained, and the interference reference signal of the same delay amount is obtained. Is generated, the interference wave is canceled, the radio wave of the specific frequency is accurately received, the reception accuracy of the radio wave is increased, and the transmission efficiency can be improved.
[0076]
According to a second aspect of the present invention, the received signal received from the first antenna is amplified and transmitted from the second antenna, and the received signal is branched to extract an interference reference signal. In a wireless relay method for suppressing an interference wave wrapping around from the antenna to the first antenna, a correlation operation between the modulated signal and the received signal is performed, and a correlation operation between the modulated signal and the interference reference signal is performed. Calculates the delay time of the transmission path of the interference wave from the antenna, so that the delay amount of the transmission path of the interference interference wave of the antenna is accurately obtained, an interference reference signal having the same delay amount is generated, this interference wave is suppressed, and the specific frequency is reduced. , And the transmission efficiency can be improved by increasing the reception accuracy of the radio wave.
[0077]
According to a third aspect of the present invention, after the received signal received from the first antenna is amplified by the amplifying means and delayed by the delay means, the signal is transmitted from the second antenna, and after the delay, the signal is divided by the branching means. In a wireless relay apparatus for splitting a delayed signal, extracting an interference reference signal from the delayed signal, and suppressing an interference wave wrapping around from the second antenna to the first antenna, a branch coupling unit for the split delayed signal A correlation operation is performed between the received signal and the interference reference signal, and the delay time of the interference wave transmission path is calculated from the calculation results. It is possible to generate an interference reference signal of a delay amount, cancel the interference wave, accurately receive a radio wave of a specific frequency, improve the reception accuracy of the radio wave, and improve the transmission efficiency.
[0078]
According to the fourth and fifth aspects of the present invention, the first and second limiting means are controlled by the limiting control means, and the input of the received signal and the output of the delayed signal are appropriately performed during the correlation calculation by the first correlation calculating means. When the correlation operation is performed by the second correlation operation means, by appropriately stopping the output of the delay signal, it is possible to appropriately capture a signal necessary for the correlation operation.
[0079]
According to a sixth aspect of the present invention, after calculating the delay time, the output of the transmission signal to the second antenna is restarted by the control of the limiting means by the limiting control means, and the operation mode shifts to the operation mode for controlling the phase and amplitude of the interference reference signal. Then, an interference reference signal is generated from the received signal, and the interference reference signal is used to cancel an interference signal that wraps around the space, so that a radio wave of a specific frequency is accurately received, and the reception accuracy of the radio wave is increased and transmitted. Efficiency can be improved.
[0080]
According to the seventh to ninth aspects of the present invention, the gain control means controls the gain of the amplifying means, and during the correlation calculation by the first correlation calculating means, the gain of the amplifying means is reduced. After the delay time calculation, the gain of the amplifying means is increased, so that the reception signal can be passed.
[0081]
According to the tenth aspect of the present invention, since the correlation operation is performed using the noise, a steep correlation value is obtained when the correlation is obtained, and the correlation operation can be performed with high accuracy, thereby preventing the influence of the interference wave. it can.
[0082]
According to an eleventh aspect of the present invention, after the received signal received from the first antenna is amplified by the amplifying unit, the signal is transmitted from the second antenna, and after the amplification, the received signal is branched by the branching unit. In a wireless relay apparatus that extracts an interference reference signal from a received signal and suppresses an interference wave that wraps around from the second antenna to the first antenna, a modulated signal is output from the inside, and a branch for the branched modulated signal is output. Correlation calculation is performed between the received signal and the interference reference signal branched by the coupling means, and the delay time of the transmission path of the interference wave is calculated from the calculation result. By generating interference reference signals with the same amount of delay to suppress this interference wave, accurately receive radio waves of a specific frequency, improve the reception accuracy of radio waves and improve transmission efficiency .
[0083]
According to the twelfth and thirteenth aspects of the present invention, when performing the correlation calculation and the signal delay, the switching control means switches the input between the amplified received signal and the modulated signal, and the first and second correlation calculation means When the correlation calculation is performed, the modulated signal is captured, and when the signal is delayed by the delay control unit, the amplified received signal is captured, so that an appropriate signal input can be performed according to each case.
[0084]
According to the fourteenth and fifteenth aspects of the present invention, when performing the correlation calculation, the limit control means controls the first and second limiting means, and when performing the correlation calculation by the first correlation calculation means, Since the input of the received signal and the output of the delayed signal are performed, and the output of the delayed signal is performed at the time of the correlation operation by the second correlation operation means, an appropriate signal can be selected according to each correlation operation.
[0085]
According to the sixteenth aspect of the present invention, the gain control means controls the gain of the amplifying means to increase after the delay time calculation, so that the amplifying means can pass the received signal.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a configuration of a wireless relay device according to a first embodiment of the present invention;
FIG. 2 is a characteristic diagram of a correlation characteristic showing a delay time between a signal (2) and a signal (3) shown in FIG. 1;
FIG. 3 is a flowchart illustrating an operation for detecting a delay time of an interference wave by the wireless relay device illustrated in FIG. 1;
FIG. 4 is a configuration diagram illustrating a configuration of a wireless relay apparatus according to a second embodiment of the present invention;
5 is a flowchart illustrating an operation for detecting a delay time of an interference wave by the wireless relay device illustrated in FIG. 5;
FIG. 6 is a configuration diagram illustrating an example of a configuration of a conventional wireless relay device.
FIG. 7 is a configuration diagram showing another example of the configuration of the wireless relay device.
[Explanation of symbols]
1-3 switch (SW)
10 receiving antenna
11,13 Directional coupler
12 Amplifying unit
14 Network Analyzer
15 Interference suppression unit
15a, 18 delay circuit
15b PS
15c ATT
16 transmitting antenna
17 Ripple detection unit / FFT operation unit
19 Correlation calculator
21 SG

Claims

While amplifying and delaying the received signal received from the first antenna and transmitting it from the second antenna, the received signal is branched to extract an interference reference signal, and the first signal is extracted from the second antenna. In a wireless relay method for suppressing an interference wave wrapping around an antenna,
A first correlation operation step of performing a correlation operation between the branched received signal and the delayed delayed signal;
A first stopping step of stopping transmission signal output to the second antenna;
A generating step of generating the interference reference signal from the delayed signal,
A second correlation operation step for performing a correlation operation between the delay signal and the interference reference signal; and a delay for calculating a delay time of the transmission path of the interference wave from operation results in the first and second correlation operation steps. A computing step;
A delay control step of delaying the interference reference signal based on the calculated delay time.

While amplifying the received signal received from the first antenna and transmitting it from the second antenna, the received signal is branched to extract an interference reference signal, and the interference reference signal is extracted from the second antenna to the first antenna. In a wireless relay method for suppressing wraparound interference waves,
A signal output step of outputting a modulated signal to the second antenna;
A branching step of branching the output modulated signal,
A first correlation operation step of performing a correlation operation between the split received signal and the split modulation signal;
A first stop step of stopping the reception signal input from the first antenna and the transmission signal output to the second antenna;
A generating step of generating the interference reference signal from the modulated signal,
A second correlation operation step of performing a correlation operation between the output modulated signal and the interference reference signal,
A delay calculation step of calculating a delay time of the transmission path of the interference wave from a calculation result in the first and second correlation calculation steps;
A delay control step of delaying the interference reference signal based on the calculated delay time.

After amplifying the received signal received from the first antenna by the amplifying unit and delaying the signal by the delay unit, the signal is transmitted from the second antenna, and after the delay, the delayed signal is branched by the branching unit. In a wireless relay device that extracts an interference reference signal from a signal and suppresses an interference wave that wraps around from the second antenna to the first antenna,
First limiting means for limiting a received signal input from the first antenna;
Second limiting means for limiting a delay signal output to the second antenna;
Branch-coupling means for branching a received signal received by the first antenna from a trunk, and coupling an input signal to the trunk-received signal;
First correlation operation means for performing a correlation operation between the reception signal branched by the branch coupling means and the delayed signal branched,
Generating means for generating the interference reference signal from the branched delay signal,
A second correlation operation unit that performs a correlation operation between the branched delay signal and the interference reference signal;
Delay calculating means for calculating a delay time of the transmission path of the interference wave from a calculation result of the first and second correlation calculating means;
A wireless relay device comprising: delay control means for delaying the interference reference signal based on the calculated delay time.

The wireless relay device according to claim 3, wherein the wireless relay device further includes a restriction control unit that controls the first and second restriction units when performing the correlation operation.

The limit control means enables the reception signal input and the delay signal output by the first and second limit means when the first correlation calculation means performs the correlation calculation, and the second correlation calculation means The wireless relay device according to claim 4, wherein when the means performs the correlation operation, the output of the delayed signal by the second limiting means is stopped.

6. The limit control unit according to claim 4, wherein after the delay time calculation by the delay calculation unit, the reception signal input and the delay signal output by the first and second limit units are enabled. Wireless relay device.

The wireless relay device according to at least one of claims 3 to 5, wherein the wireless relay device further includes a gain control unit that controls a gain of the amplification unit when performing the correlation operation.

8. The wireless relay device according to claim 7, wherein the gain control unit decreases the gain of the amplification unit when the first correlation operation unit performs the correlation operation.

9. The wireless relay device according to claim 7, wherein the gain control unit increases the gain of the amplification unit after calculating the delay time by the delay calculation unit.

The wireless relay device according to any one of claims 3 to 9, wherein the reception signal received from the first antenna comprises noise generated from the own device.

After the received signal received from the first antenna is amplified by the amplifying unit, the signal is transmitted from the second antenna, and after the amplification, the received signal is branched by the branching unit, and the interference reference signal is extracted from the received signal. Then, in a wireless relay apparatus that suppresses an interference wave wrapping around from the second antenna to the first antenna,
First limiting means for limiting a received signal input from the first antenna;
Second limiting means for limiting a transmission signal output to the second antenna;
Signal output means for outputting a modulated signal to the second antenna;
Branching means for branching the output modulated signal;
Branch-coupling means for branching a reception signal received by the first antenna from a main line and coupling an input signal to the reception signal;
First correlation operation means for performing a correlation operation between the reception signal branched by the branch coupling means and the modulation signal,
Generating means for generating the interference reference signal from the modulated signal,
A second correlation operation unit for performing a correlation operation between the modulated signal and the interference reference signal; and a delay for calculating a delay time of the transmission path of the interference wave from the operation result of the first and second correlation operation units. Arithmetic means;
A wireless relay device comprising: delay control means for delaying the interference reference signal based on the calculated delay time.

The wireless relay device according to claim 11, wherein the wireless relay device further includes a switching control unit that performs input switching between the amplified received signal and the modulated signal when performing the correlation operation.

The switching control unit captures the modulated signal when the first and second correlation calculation units perform a correlation calculation, and captures the amplified reception signal when the delay control unit delays a signal. The wireless relay device according to claim 12, wherein:

14. The radio relay apparatus according to at least one of claims 11 to 13, wherein the radio relay device further includes a restriction control unit that controls the first and second restriction units when performing the correlation operation. Wireless relay device.

The limit control means enables the reception signal input and the modulation signal output by the first and second limit means when the first correlation calculation means performs the correlation calculation, and the second correlation calculation means 15. The wireless relay device according to claim 14, wherein when the means performs a correlation operation, the reception signal input and the modulation signal output by the first and second limiting means are stopped.

The wireless relay device further includes gain control means for controlling a gain of the amplifying means, and the gain control means increases a gain of the amplifying means after calculating a delay time by a delay calculating means. Item 16. A wireless relay device according to at least one of Items 11 to 15.