JP4752397B2 - Relay device and radio communication system - Google Patents

Relay device and radio communication system Download PDF

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JP4752397B2
JP4752397B2 JP2005245893A JP2005245893A JP4752397B2 JP 4752397 B2 JP4752397 B2 JP 4752397B2 JP 2005245893 A JP2005245893 A JP 2005245893A JP 2005245893 A JP2005245893 A JP 2005245893A JP 4752397 B2 JP4752397 B2 JP 4752397B2
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base station
radio wave
transmitted
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gain
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晴康 千田
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Mitsubishi Electric Corp
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Description

本発明は、基地局と移動局が漏洩同軸ケーブルを介して無線通信する無線通信システムに関し、特に漏洩同軸ケーブルを中継する中継装置に関する。   The present invention relates to a wireless communication system in which a base station and a mobile station perform wireless communication via a leaky coaxial cable, and more particularly to a relay device that relays the leaky coaxial cable.

列車無線システム等、漏洩同軸ケーブルを介して無線通信する無線通信システムとして、特許文献１に記載された無線通信システムがある。   As a radio communication system that performs radio communication via a leaky coaxial cable such as a train radio system, there is a radio communication system described in Patent Document 1.

この無線通信システムは、基地局及び移動局から送信する送信電波が漏洩同軸ケーブルを伝搬するが、漏洩同軸ケーブルの伝送損失を補償するために中継装置が適宜の間隔で設けられる。中継装置では、その出力側における送信電波の電力レベルが一定であることが望ましいので、中継装置の出力側の送信電波を監視し、その電力レベルが一定になるように増幅器のゲインを調整するようにしている。   In this wireless communication system, transmission radio waves transmitted from a base station and a mobile station propagate through a leaky coaxial cable, but relay devices are provided at appropriate intervals in order to compensate for transmission loss of the leaky coaxial cable. In the relay device, it is desirable that the power level of the transmission radio wave on the output side is constant. Therefore, the transmission radio wave on the output side of the relay device is monitored and the gain of the amplifier is adjusted so that the power level is constant. I have to.

ところが、基地局が送信する送信電波は連続的に送信されるため、その送信電波を中継装置の出力側で監視し、ゲイン調整することは可能であるが、移動局が送信する送信電波は断続的であるため、それを監視してゲイン調整することが困難であった。そのため、特許文献１に記載された無線通信システムでは、漏洩同軸ケーブルの終端架にパイロット信号を連続して送出するパイロット信号送信部を設け、各中継装置でパイロット信号を監視することにより、ゲイン調整を行い、移動局側から送信される送信電波の電力レベルを一定に調整するように構成している。   However, since the transmission radio wave transmitted by the base station is continuously transmitted, it is possible to monitor the transmission radio wave on the output side of the relay device and adjust the gain, but the transmission radio wave transmitted by the mobile station is intermittent. Therefore, it is difficult to adjust the gain by monitoring it. For this reason, in the wireless communication system described in Patent Document 1, a gain adjustment is performed by providing a pilot signal transmission unit that continuously transmits a pilot signal to the end of the leaky coaxial cable and monitoring the pilot signal by each relay device. And the power level of the transmission radio wave transmitted from the mobile station side is adjusted to be constant.

特開２００１−２６７９７８号公報JP 2001-267978 A

特許文献１に記載された無線通信システムは、本来の通信のための送信電波に加えてパイロット信号を送信しているため、パイロット信号自体は他の通信システムに対して妨害波にならないように信号レベルを小さくする必要がある。このため、増幅器のゲインを調整する精度が充分に得られない問題点があった。また、パイロット信号を生成するパイロット信号送信部を終端架に設ける必要があると共に、各中継装置にパイロット信号を中継する装置が必要になる問題点があった。   Since the wireless communication system described in Patent Document 1 transmits a pilot signal in addition to a transmission wave for original communication, the pilot signal itself is a signal that does not become an interference wave with respect to other communication systems. The level needs to be reduced. For this reason, there is a problem that the accuracy of adjusting the gain of the amplifier cannot be obtained sufficiently. In addition, it is necessary to provide a pilot signal transmission unit for generating a pilot signal in the terminal rack, and there is a problem that a device for relaying the pilot signal is required for each relay device.

本発明は、上記の問題点に鑑みてなされたものであり、パイロット信号を用いないで、移動局が送信する送信電波を増幅する増幅器のゲインを適正に調整することができるようにすることを目的としている。   The present invention has been made in view of the above-described problems, and it is desirable to appropriately adjust the gain of an amplifier that amplifies a transmission radio wave transmitted by a mobile station without using a pilot signal. It is aimed.

本発明に係る中継装置は、基地局側及び移動局側にそれぞれ略同じ長さの漏洩同軸ケーブルが接続され、基地局及び移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置において、基地局側から連続的に送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から連続的に送信された通信のための送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変する可変利得手段を具備したものである。 In the relay device according to the present invention, leaky coaxial cables having substantially the same length are connected to the base station side and the mobile station side, respectively, and relay communication data transmitted and received between the base station and the mobile station via the leaky coaxial cable. In the relay device, a first duplexer that distributes the transmission radio wave continuously transmitted from the base station side to the first amplification unit and transmits the transmission radio wave amplified by the second amplification unit toward the base station, The second demultiplexer for transmitting the transmission radio wave amplified by the first amplification unit toward the mobile station and distributing the transmission radio wave transmitted from the mobile station side to the second amplification unit, continuously transmitted from the base station side are gain adjusted signal to that control means supplies the output level of the first amplifying unit based on the transmission wave to control the gain of the first amplifying portion to be constant for the communication, the first demultiplexed The above-mentioned second that the device transmits to the base station The transmission radio wave width portion is amplified is obtained by including a variable gain means for varying by said gain adjustment signal.

また、本発明の別の発明に係る中継装置は、基地局側と移動局側にそれぞれ略同じ長さの漏洩同軸ケーブルが接続され、基地局及び移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置において、基地局側から連続的に送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から連続的に送信された通信のための送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器の基地局側に設けられ、上記第１分波器が上記第１増幅部へ分配する送信電波及び上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を可変する可変利得手段を具備し、上記可変利得手段は、上記第１増幅部が上記第１増幅部へ分配する送信電波及び上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変するものである。 The relay apparatus according to another aspect of the present invention, each is connected substantially leaky coaxial cable having the same length as the base station side to the mobile station, the leakage coaxial communication data transmitted and received between the base station and mobile station In a relay device that relays via a cable, the transmission radio wave continuously transmitted from the base station side is distributed to the first amplification unit, and the transmission radio wave amplified by the second amplification unit is transmitted to the base station. A first demultiplexer, a second demultiplexer for transmitting the transmission radio wave amplified by the first amplification unit toward the mobile station and distributing the transmission radio wave transmitted from the mobile station side to the second amplification unit, a base station Control means for supplying a gain adjustment signal for controlling the gain of the first amplifying unit so that the output level of the first amplifying unit becomes constant based on a transmission radio wave for communication continuously transmitted from the side, Provided on the base station side of the first duplexer , Said variable gain means the first duplexer to vary the transmission radio wave amplified the second amplifying unit transmitting radio wave and the first duplexer for distributing to said first amplifying unit is transmitted to the base fabric station The variable gain means includes a transmission radio wave distributed by the first amplifying unit to the first amplifying unit and a transmission amplified by the second amplifying unit that the first demultiplexer transmits to the base station. The radio wave is varied by the gain adjustment signal .

さらに、本発明の別の発明に係る中継装置は、基地局及び移動局間で送受信する通信データを漏洩同軸ケーブルを介して中継する中継装置において、基地局側から送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から送信された送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変する可変利得手段、上記第１増幅部の出力する一部の送信電波を抽出して上記第２増幅部へ出力する入力手段、上記第２増幅部により増幅された、上記入力手段が出力した上記第１増幅部の出力する一部の送信電波に基づき上記第２増幅部のゲインを調整する調整手段を具備したものである。
さらに加えて、本発明の別の発明に係る無線通信システムは、基地局、上記基地局と通信データを送受信する移動局、上記基地局及び上記移動局が送信する送信電波を搬送する、それぞれ略同じ長さの複数の漏洩同軸ケーブル、上記基地局側及び上記移動局側に上記漏洩同軸ケーブルが接続され、上記基地局及び上記移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置を具備し、上記中継装置は、上述した本発明に係る中継装置のうちいずれかの中継装置であるものである。
Furthermore, the relay device according to another aspect of the present invention is a relay apparatus for relaying through a coaxial cable model leakage of communication data to be transmitted and received between the base station and the mobile station, the transmission radio wave transmitted from the base station side first A first demultiplexer that distributes to one amplifying unit and transmits the transmission radio wave amplified by the second amplifying unit toward the base station, and transmits the transmission radio wave amplified by the first amplifying unit toward the mobile station. A second demultiplexer for distributing the transmission radio wave transmitted from the mobile station side to the second amplification unit, and the output level of the first amplification unit based on the transmission radio wave transmitted from the base station side so as to be constant gain adjustment signal you supply control means for controlling the gain of the first amplifying unit, a transmission radio wave in which the second amplifier in which the first duplexer is transmitted toward the base station is amplified by the gain adjustment signal variable variable gain means, said first amplifier Input means for extracting a portion of the transmission radio wave output to the second amplifying section for outputting, said amplified by the second amplifying unit, some outputs of said first amplifier unit in which the input means is output Adjusting means for adjusting the gain of the second amplifying unit based on the transmitted radio wave is provided.
In addition, a radio communication system according to another invention of the present invention includes a base station, a mobile station that transmits and receives communication data to and from the base station, and a transmission radio wave that is transmitted by the base station and the mobile station. A plurality of leaky coaxial cables having the same length, the leaky coaxial cable connected to the base station side and the mobile station side, and relaying communication data transmitted and received between the base station and the mobile station via the leaky coaxial cable The relay device is any one of the relay devices according to the present invention described above.

本発明は、基地局から送信された送信電波を増幅する増幅部のゲイン調整信号で移動局の送信電波を増幅する増幅部のゲインを調整するように構成したので、パイロット信号を用いないで、移動局が送信する送信電波を増幅する増幅部のゲインを適正に調整することができる効果がある。   Since the present invention is configured to adjust the gain of the amplification unit that amplifies the transmission radio wave of the mobile station with the gain adjustment signal of the amplification unit that amplifies the transmission radio wave transmitted from the base station, without using a pilot signal, There is an effect that the gain of the amplifying unit for amplifying the transmission radio wave transmitted by the mobile station can be adjusted appropriately.

以下、本発明の実施の形態について、図に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の中継装置を適用する無線通信システムの全体構成図である。図において、１は移動局２へ向けて送信電波を送信する基地局、３は基地局１及び移動局２の送信する送信電波を搬送する漏洩同軸ケーブルで、列車無線システムの場合、線路に沿って１本又は２本敷設される。４１は基地局１の送信する送信電波を増幅器５１へ分配すると共に、増幅器５２の増幅した移動局２からの送信電波を基地局１に向けて送信する分波器、４２は増幅器５１の増幅した基地局１からの送信電波を移動局２に向けて送信すると共に、移動局２の送信する送信電波を増幅器５２へ分配する分波器、６は信号の反射を抑止するために漏洩同軸ケーブル３の終端に設けられた終端器で、通常は、５０Ω終端が用いられる。なお、図中、分波器４１、４２及び増幅器５１、５２で中継装置が構成される。図１では２つの中継装置を示しているが、無線列車システムでは、１．３Ｋｍ〜１．５Ｋｍ程度の略等間隔で漏洩同軸ケーブル３を多数中継する。   FIG. 1 is an overall configuration diagram of a wireless communication system to which a relay device of the present invention is applied. In the figure, 1 is a base station that transmits transmission radio waves toward the mobile station 2, 3 is a leaky coaxial cable that carries transmission radio waves transmitted by the base station 1 and the mobile station 2. One or two are installed. 41 divides the transmission radio wave transmitted from the base station 1 to the amplifier 51, and a demultiplexer that transmits the radio wave transmission from the mobile station 2 amplified by the amplifier 52 toward the base station 1, and 42 amplifies the amplifier 51. A demultiplexer for transmitting the transmission radio wave from the base station 1 toward the mobile station 2 and distributing the transmission radio wave transmitted by the mobile station 2 to the amplifier 52, 6 is a leaky coaxial cable 3 for suppressing signal reflection Usually, a 50Ω termination is used. In the figure, the demultiplexers 41 and 42 and the amplifiers 51 and 52 constitute a relay device. Although two relay apparatuses are shown in FIG. 1, in the radio train system, a large number of leaky coaxial cables 3 are relayed at approximately equal intervals of about 1.3 km to 1.5 km.

ここで、基地局１が移動局２へ向けて送信する送信電波が連続的で、移動局２が基地局へ向けて送信する送信電波が断続的になることを、図２を用いて補足しておく。図２において、縦軸は周波数、横軸は時間である。基地局１が移動局２へ向けて送信する下り信号の送信電波は、所定の周波数で常時送信されている。一方、移動局２が基地局１へ向けて送信する上り信号は各々の移動局に割当てられた所定の周波数で断続的になされる。図２では、各移動局２が順次送信し、上り信号としては常時信号があるように図示されているが、現実には各々の移動局２が基地局１（実際には基地局１の上位に接続された指令局）へ向けて音声通信等を行なう必要が発生した時に基地局１と送信のネゴを行い、基地局１が指令する所定のタイミングで移動局２が音声等のデータを送信する。このとき、移動局２は、下り信号と同期をとった所定のタイミングでデータ送信するので、基地局１は、何時でも移動局２が同期をとれるように連続的に送信電波を送信しておく必要がある。したがって、基地局１が移動局２へ向けて送信する送信電波が連続的で、移動局２が基地局へ向けて送信する送信電波が断続的になる。   Here, it is supplemented by using FIG. 2 that the transmission radio wave transmitted from the base station 1 toward the mobile station 2 is continuous and the transmission radio wave transmitted from the mobile station 2 toward the base station is intermittent. Keep it. In FIG. 2, the vertical axis represents frequency and the horizontal axis represents time. The transmission radio wave of the downlink signal transmitted from the base station 1 to the mobile station 2 is constantly transmitted at a predetermined frequency. On the other hand, the uplink signal transmitted from the mobile station 2 to the base station 1 is intermittently performed at a predetermined frequency assigned to each mobile station. In FIG. 2, each mobile station 2 is sequentially transmitted, and there is always a signal as an upstream signal. However, in reality, each mobile station 2 is a base station 1 (actually, a higher rank of the base station 1). Negotiation of transmission with the base station 1 when it becomes necessary to perform voice communication or the like to the command station connected to the mobile station 2 and the mobile station 2 transmits data such as voice at a predetermined timing commanded by the base station 1 To do. At this time, since the mobile station 2 transmits data at a predetermined timing synchronized with the downlink signal, the base station 1 continuously transmits transmission radio waves so that the mobile station 2 can be synchronized at any time. There is a need. Therefore, the transmission radio wave transmitted from the base station 1 toward the mobile station 2 is continuous, and the transmission radio wave transmitted from the mobile station 2 toward the base station is intermittent.

次に、本発明の基本的な考え方を予め述べておく。本発明では、基地局１の送信する下り送信電波を中継装置で増幅する増幅器５１のゲイン調整は従来と同様に行なう。一方、移動局２の送信する上り送信電波を増幅する増幅器５２のゲイン調整は、同じ中継装置内の下り信号の増幅器５１のゲイン調整信号を用いて行なう。上り信号の増幅器５２のゲイン調整を下り信号の増幅器５１のゲイン調整信号で行なうことで、上り信号の増幅器のゲインを適正に調整することができる根拠は次の２点による。
（１）基地局１から送信された下りの送信電波は、中継装置より基地局１側の漏洩同軸ケーブル３で伝送損失が発生する。一方、移動局２から送信された上りの送信電波は中継装置より移動局２側の漏洩同軸ケーブル３で伝送損失が発生する。これら二つの漏洩同軸ケーブルの伝送損失が同一であれば、ゲイン調整信号も同じになる。ここで、漏洩同軸ケーブル３の伝送損失が変化する要因としては、漏洩同軸ケーブル３の長さ及び周囲温度の影響があるが、中継装置は略等間隔に設置されることから漏洩同軸ケーブル３の長さは略同じであり、周囲温度も略同じとみなせる。したがって、中継装置の基地局１側漏洩同軸ケーブル３の伝送損失と中継装置の移動局２側漏洩同軸ケーブル３の伝送損失は略同じとみなせる。
（２）増幅器５１、５２の周囲温度変動によるゲインの変動が考えられるが、同じ中継装置内に設けられるため、周囲温度変動によるゲインの変動も略同じとみなせる。 Next, the basic concept of the present invention will be described in advance. In the present invention, the gain adjustment of the amplifier 51 that amplifies the downlink transmission radio wave transmitted from the base station 1 by the relay device is performed in the same manner as in the prior art. On the other hand, the gain adjustment of the amplifier 52 that amplifies the uplink transmission radio wave transmitted by the mobile station 2 is performed using the gain adjustment signal of the downlink signal amplifier 51 in the same relay apparatus. The reason why the gain of the amplifier for the upstream signal can be appropriately adjusted by adjusting the gain of the amplifier 52 for the upstream signal with the gain adjustment signal of the amplifier 51 for the downstream signal is based on the following two points.
(1) A transmission loss occurs in the downstream transmission radio wave transmitted from the base station 1 through the leaky coaxial cable 3 on the base station 1 side from the relay device. On the other hand, an upstream transmission radio wave transmitted from the mobile station 2 causes a transmission loss in the leaky coaxial cable 3 on the mobile station 2 side from the relay device. If the transmission loss of these two leaky coaxial cables is the same, the gain adjustment signal is also the same. Here, the cause of the change in the transmission loss of the leaky coaxial cable 3 is the influence of the length of the leaky coaxial cable 3 and the ambient temperature, but the relay devices are installed at substantially equal intervals. The length is substantially the same, and the ambient temperature can be regarded as substantially the same. Therefore, the transmission loss of the base station 1-side leaky coaxial cable 3 of the relay apparatus and the transmission loss of the mobile station 2-side leaky coaxial cable 3 of the relay apparatus can be regarded as substantially the same.
(2) Although gain fluctuations due to ambient temperature fluctuations of the amplifiers 51 and 52 can be considered, since they are provided in the same relay apparatus, gain fluctuations due to ambient temperature fluctuations can be regarded as substantially the same.

以下、具体的に実施の形態１の構成を説明する。図３は本発明における実施の形態１に係る中継装置のブロック構成図であり、３は線路等に沿って敷設された漏洩同軸ケーブルである。分波器４１は基地局１からの下り信号送信電波を可変利得手段７１を介して増幅器５１に分配すると共に、増幅器５２の増幅した送信電波を可変利得手段７２を介して入力し、基地局１へ向けて送信する。可変利得手段７１、７２は、例えば電圧可変アッテネータからなる。分波器４２は増幅器５１の増幅した送信電波を移動局２へ向けて送信すると共に、移動局２側から送信された送信電波を増幅器５２へ分配する。検波手段８は増幅器５１の出力の一部を抽出するカプラ９の出力を検波する。検波手段８により検波された信号は比較手段１０により所定の利得基準１１と比較され、それらの偏差に応じたゲイン調整信号を可変利得手段７１及び７２に供給する。   Hereinafter, the configuration of the first embodiment will be specifically described. FIG. 3 is a block configuration diagram of the relay apparatus according to Embodiment 1 of the present invention, and 3 is a leaky coaxial cable laid along a line or the like. The demultiplexer 41 distributes the downlink signal transmission radio wave from the base station 1 to the amplifier 51 via the variable gain means 71 and inputs the transmission radio wave amplified by the amplifier 52 via the variable gain means 72. Send to. The variable gain means 71 and 72 are, for example, voltage variable attenuators. The duplexer 42 transmits the transmission radio wave amplified by the amplifier 51 toward the mobile station 2 and distributes the transmission radio wave transmitted from the mobile station 2 side to the amplifier 52. The detection means 8 detects the output of the coupler 9 that extracts a part of the output of the amplifier 51. The signal detected by the detection means 8 is compared with a predetermined gain reference 11 by the comparison means 10, and a gain adjustment signal corresponding to the deviation is supplied to the variable gain means 71 and 72.

即ち、基地局１から送信された送信電波は分波器４１により可変利得手段７１側に分配され、該可変利得手段７１及び増幅器５１の所定の利得で増幅された後、分波器４２により移動局２へ向けて送信される。増幅器５１の出力の一部はカプラ９によって抽出され検波手段８に入力される。検波手段８はカプラ９が抽出した増幅器５１の出力の一部を検波することにより、増幅器５１が増幅した送信電波の電力レベルを検出する。比較手段１０は検波手段８の検出した増幅器５１の電力レベルと利得基準１１の設定とを比較し、両者の偏差がなくなるように、可変利得手段７１の利得を制御する。この結果、増幅器５１は利得基準１１の設定に応じた所定の電力レベルに制御されることになる。   That is, the transmission radio wave transmitted from the base station 1 is distributed to the variable gain means 71 by the demultiplexer 41, amplified by a predetermined gain of the variable gain means 71 and the amplifier 51, and then moved by the demultiplexer 42. It is transmitted toward the station 2. A part of the output of the amplifier 51 is extracted by the coupler 9 and input to the detection means 8. The detection means 8 detects a power level of the transmission radio wave amplified by the amplifier 51 by detecting a part of the output of the amplifier 51 extracted by the coupler 9. The comparison means 10 compares the power level of the amplifier 51 detected by the detection means 8 with the setting of the gain reference 11, and controls the gain of the variable gain means 71 so that there is no deviation between them. As a result, the amplifier 51 is controlled to a predetermined power level according to the setting of the gain reference 11.

次に、移動局２から送信された送信電波は、分波器４２により増幅器５２に分配される。移動局２の送信電波は増幅器５２及び可変利得手段７２で所定の電力レベルに増幅され、分波器４１により基地局１へ向けて送信される。可変利得手段７２は比較手段１０から上述のゲイン調整信号を入力し、移動局２の送信電波を利得基準１１の設定に応じた所定の電力レベルに制御する。   Next, the transmission radio wave transmitted from the mobile station 2 is distributed to the amplifier 52 by the duplexer 42. The transmission radio wave of the mobile station 2 is amplified to a predetermined power level by the amplifier 52 and the variable gain means 72 and transmitted to the base station 1 by the duplexer 41. The variable gain means 72 receives the above gain adjustment signal from the comparison means 10 and controls the transmission radio wave of the mobile station 2 to a predetermined power level according to the setting of the gain reference 11.

図４は、本発明の実施の形態２に係る中継装置のブロック構成図である。図において、図３と同一又は相当部分には同一符号を付している。この実施の形態２と図３の実施の形態１との相違点は、カプラ９と検波手段８との間にバンドパスフィルタ１２を挿入した点である。   FIG. 4 is a block configuration diagram of a relay apparatus according to Embodiment 2 of the present invention. In the figure, the same or corresponding parts as in FIG. The difference between the second embodiment and the first embodiment shown in FIG. 3 is that a band pass filter 12 is inserted between the coupler 9 and the detection means 8.

この実施の形態２に係る基地局１は移動局２へ送信するデータを複数の周波数チャネルで送信するものである。例えば、ｆ１、ｆ２、ｆ３の３つの周波数チャネルでデータ送信している場合、周波数チャネルｆ１の送信電波のみを増幅部のゲイン調整に用いようとするものである。   The base station 1 according to the second embodiment transmits data to be transmitted to the mobile station 2 using a plurality of frequency channels. For example, when data transmission is performed using three frequency channels f1, f2, and f3, only the transmission radio wave of the frequency channel f1 is used for gain adjustment of the amplification unit.

即ち、基地局１から送信された送信電波は、分波器４１により可変利得手段７１を介して増幅器５１へ分配される。そして、可変利得手段７１及び増幅器５１で所定の電力レベルに増幅された送信電波は、分波器４２により移動局２へ向けて送信される。増幅器５１の出力はカプラ９でその一部が抽出され、さらに、周波数チャネルｆ１の出力のみがバンドパスフィルタ１２を通過して検波手段８に入力する。検波手段８により検出した周波数チャネルｆ１の送信電波の電力レベルは比較手段１０で利得基準１１の設定と比較され、これらの偏差に応じたゲイン調整信号を可変利得手段７１、７２へ供給し、ゲインを調整する。   That is, the transmission radio wave transmitted from the base station 1 is distributed to the amplifier 51 through the variable gain means 71 by the duplexer 41. The transmission radio wave amplified to a predetermined power level by the variable gain means 71 and the amplifier 51 is transmitted toward the mobile station 2 by the duplexer 42. A part of the output of the amplifier 51 is extracted by the coupler 9, and only the output of the frequency channel f 1 passes through the band pass filter 12 and is input to the detection means 8. The power level of the transmission radio wave of the frequency channel f1 detected by the detection means 8 is compared with the setting of the gain reference 11 by the comparison means 10, and a gain adjustment signal corresponding to these deviations is supplied to the variable gain means 71 and 72, Adjust.

この実施の形態２によれば、バンドパスフィルタ１２によって基地局１が送信する一つの周波数チャネルの送信電波を通過させて、検波手段８で検出するようにしているので、下り信号の近傍に妨害波があったとしても、バンドパスフィルタ１２が所定の周波数チャネルの送信電波のみを通過させるので、妨害波の影響を受けることがない効果がある。また、上述の説明のように周波数チャネルｆ１の送信電波のみをゲイン調整用の信号として用いているので、他の周波数チャネルｆ２、ｆ３の送信電波は必ずしも連続的に送信する必要がなく、システムの多様化に対応できる効果がある。   According to the second embodiment, the transmission radio wave of one frequency channel transmitted by the base station 1 is passed by the band pass filter 12 and detected by the detection means 8, so that interference is caused in the vicinity of the downstream signal. Even if there is a wave, since the band-pass filter 12 passes only the transmission radio wave of a predetermined frequency channel, there is an effect that it is not affected by the interference wave. Further, as described above, only the transmission radio wave of the frequency channel f1 is used as a signal for gain adjustment. Therefore, the transmission radio waves of the other frequency channels f2 and f3 do not necessarily need to be transmitted continuously. There is an effect that can cope with diversification.

図５は本発明の実施の形態３に係る中継装置を示すブロック構成図である。図５において、図３と同一又は相当部分には同一符号を付しており、７０は可変利得手段である。   FIG. 5 is a block diagram showing a relay apparatus according to Embodiment 3 of the present invention. In FIG. 5, the same or corresponding parts as in FIG. 3 are denoted by the same reference numerals, and 70 is a variable gain means.

実施の形態１では、可変利得手段７１、７２を下り信号ゲイン調整用及び上り信号ゲイン調整用に２つ設けているが、この実施の形態３では、分波器４１の基地局１側に一つ設けており、この可変利得手段７０で下り・上りの両方の信号をゲイン調整するようにしたものである。   In the first embodiment, two variable gain means 71 and 72 are provided for the downlink signal gain adjustment and the uplink signal gain adjustment. However, in the third embodiment, one is provided on the base station 1 side of the duplexer 41. The variable gain means 70 adjusts the gain of both downstream and upstream signals.

即ち、基地局１から送信された送信電波は、可変利得手段７０を介して分波器４１に入力する。分波器４１は基地局１の送信電波を増幅器５１へ分配し、該増幅器５１で増幅された送信電波は分波器４２により移動局２へ向けて送信される。移動局２から送信された送信電波は、分波器４２で増幅器５２へ分配され、該増幅器５２で増幅され分波器４１で可変利得手段７０へ分配され、ゲイン調整されて基地局１へ向けて送信される。増幅器５１の出力の一部はカプラ９で抽出され、検波手段８で検波されることにより、送信電波の電力レベルとして検出される。検波手段８の出力は、比較手段１０で利得基準１１の設定と比較され、それらの偏差に応じたゲイン調整信号を可変利得手段７０へ供給してゲイン調整する。この結果、増幅器５１の出力する基地局１からの送信電波の電力レベルが一定に調整され、また、増幅器５２の出力する移動局２からの送信信号は可変利得手段７０でゲイン調整されて一定の電力レベルになる。   That is, the transmission radio wave transmitted from the base station 1 is input to the duplexer 41 via the variable gain means 70. The duplexer 41 distributes the transmission radio wave of the base station 1 to the amplifier 51, and the transmission radio wave amplified by the amplifier 51 is transmitted to the mobile station 2 by the duplexer 42. The transmission radio wave transmitted from the mobile station 2 is distributed to the amplifier 52 by the demultiplexer 42, amplified by the amplifier 52, distributed to the variable gain means 70 by the demultiplexer 41, and gain-adjusted toward the base station 1. Sent. A part of the output of the amplifier 51 is extracted by the coupler 9 and detected by the detection means 8 to be detected as the power level of the transmission radio wave. The output of the detection means 8 is compared with the setting of the gain reference 11 by the comparison means 10, and a gain adjustment signal corresponding to the deviation is supplied to the variable gain means 70 for gain adjustment. As a result, the power level of the transmission radio wave output from the base station 1 output from the amplifier 51 is adjusted to be constant, and the transmission signal from the mobile station 2 output from the amplifier 52 is gain-adjusted by the variable gain means 70 to be constant. Become power level.

この実施の形態３によれば、可変利得手段７０を一つにすることができ、構成を簡素化できる効果がある。   According to the third embodiment, the number of variable gain means 70 can be made one, and the configuration can be simplified.

図６は本発明の実施の形態４に係る中継装置を示すブロック構成図である。図において、図３と同一符号は、同一又は相当部分であり、９１〜９３はカプラである。カプラ９１は増幅器５１の出力の一部を抽出する。カプラ９２はカプラ９１の抽出した増幅器５１の出力の一部を分波器４２から可変利得手段７３へ分配される移動局２の送信電波に重畳する。カプラ９３は増幅器５２の出力の一部を抽出するものである。また、１３はカプラ９３の抽出した増幅器５２の出力の一部のうち、増幅器５１の出力する周波数帯域を通過させるバンドパスフィルタである。８１はバンドパスフィルタ１３の出力を検波する検波手段、１４は利得基準、１５は検波手段８１の出力と利得基準１４の設定とを比較し、偏差に応じた調整信号を可変利得手段７３へ供給する比較手段である。   FIG. 6 is a block diagram showing a relay apparatus according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG. The coupler 91 extracts a part of the output of the amplifier 51. The coupler 92 superimposes a part of the output of the amplifier 51 extracted by the coupler 91 on the transmission radio wave of the mobile station 2 distributed from the duplexer 42 to the variable gain means 73. The coupler 93 extracts a part of the output of the amplifier 52. Reference numeral 13 denotes a band-pass filter that passes a frequency band output from the amplifier 51 out of a part of the output of the amplifier 52 extracted by the coupler 93. 81 is a detection means for detecting the output of the bandpass filter 13, 14 is a gain reference, 15 is a comparison between the output of the detection means 81 and the setting of the gain reference 14, and supplies an adjustment signal corresponding to the deviation to the variable gain means 73. It is a comparison means.

この実施の形態４と図３の実施の形態１との差異はカプラ９１〜９３、バンドパスフィルタ１３、検波手段８１、利得基準１４、比較手段１５、可変利得手段７３を付加した構成であり、その他の部分は実施の形態１と同様に機能する。   The difference between the fourth embodiment and the first embodiment shown in FIG. 3 is that the couplers 91 to 93, the bandpass filter 13, the detection means 81, the gain reference 14, the comparison means 15, and the variable gain means 73 are added. Other parts function in the same manner as in the first embodiment.

この実施の形態４は、一定の電力レベルに調整された増幅器５１の出力を用いて増幅器５２の利得を補正するように構成したものである。   In the fourth embodiment, the gain of the amplifier 52 is corrected using the output of the amplifier 51 adjusted to a constant power level.

即ち、一定の電力レベルに調整された増幅器５１の出力の一部がカプラ９１で抽出される。カプラ９１で抽出された増幅器５１の出力の一部は、移動局２から送信され分波器４２で可変利得手段７３側へ分配される送信電波にカプラ９２により重畳される。この信号は可変利得手段７３、増幅器５２を介して出力され、カプラ９３でその一部が抽出される。そして、バンドバスフィルタ１３により、重畳された信号の周波数帯を取り出し、検波手段８１で検波することにより、増幅器５２により増幅された重畳信号が検出される。この重畳信号は、増幅器５１の出力に相当するもので一定に調整された信号である。したがって、利得基準１４の設定との間に差異があれば、増幅器５２の利得に何らかの変動が生じたものと考えられる。   That is, a part of the output of the amplifier 51 adjusted to a constant power level is extracted by the coupler 91. A part of the output of the amplifier 51 extracted by the coupler 91 is superimposed by the coupler 92 on the transmission radio wave transmitted from the mobile station 2 and distributed to the variable gain means 73 side by the duplexer 42. This signal is output via the variable gain means 73 and the amplifier 52, and a part thereof is extracted by the coupler 93. The frequency band of the superimposed signal is extracted by the band-pass filter 13 and detected by the detection means 81, whereby the superimposed signal amplified by the amplifier 52 is detected. This superposed signal corresponds to the output of the amplifier 51 and is a signal adjusted to be constant. Therefore, if there is a difference from the setting of the gain reference 14, it is considered that some variation has occurred in the gain of the amplifier 52.

比較手段１５は、検波手段８１の出力と利得基準の設定とを比較し、それらの偏差に応じた信号を可変利得手段７３へ供給することにより、増幅器５２の利得変動を補正することができる。なお、移動局２の送信信号に重畳された信号は可変利得手段７２を介して分波器４１に入力されるが、該分波器４１でカットされるので、基地局１に向けて送信されることはない。   The comparison unit 15 compares the output of the detection unit 81 with the setting of the gain reference, and supplies a signal corresponding to the deviation to the variable gain unit 73, thereby correcting the gain fluctuation of the amplifier 52. The signal superimposed on the transmission signal of the mobile station 2 is input to the demultiplexer 41 via the variable gain means 72, but is cut by the demultiplexer 41, so that it is transmitted toward the base station 1. Never happen.

本発明は、列車無線システム等、漏洩同軸ケーブルを用いた無線通信システムにおける中継装置に適用できる。   The present invention can be applied to a relay device in a radio communication system using a leaky coaxial cable such as a train radio system.

本発明の中継装置を適用する無線通信システムを示した全体構成図である。It is the whole block diagram which showed the radio | wireless communications system to which the relay apparatus of this invention is applied. 基地局及び移動局の送信電波の一例を示した図である。It is the figure which showed an example of the transmission radio wave of a base station and a mobile station. 本発明における実施の形態１に係る中継装置を示したブロック構成図である。It is the block block diagram which showed the relay apparatus which concerns on Embodiment 1 in this invention. 本発明における実施の形態２に係る中継装置を示したブロック構成図である。It is the block block diagram which showed the relay apparatus which concerns on Embodiment 2 in this invention. 本発明における実施の形態３に係る中継装置を示したブロック構成図である。It is the block block diagram which showed the relay apparatus which concerns on Embodiment 3 in this invention. 本発明における実施の形態４に係る中継装置を示したブロック構成図である。It is the block block diagram which showed the relay apparatus which concerns on Embodiment 4 in this invention.

符号の説明Explanation of symbols

１ 基地局 ２ 移動局 ３ 漏洩同軸ケーブル ４１、４２ 分波器 ５１、５２ 増幅器 ７１、７２、７３ 可変利得手段 ８、８１ 検波手段 ９、９１、９２、９３ カプラ １０、１５ 比較手段 １１、１４ 利得基準
DESCRIPTION OF SYMBOLS 1 Base station 2 Mobile station 3 Leaky coaxial cable 41, 42 Divider 51, 52 Amplifier 71, 72, 73 Variable gain means 8, 81 Detection means 9, 91, 92, 93 Coupler 10, 15 Comparison means 11, 14 Gain Standard

Claims (8)

基地局側及び移動局側にそれぞれ略同じ長さの漏洩同軸ケーブルが接続され、基地局及び移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置において、基地局側から連続的に送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から連続的に送信された通信のための送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変する可変利得手段を備えたことを特徴とする中継装置。 In a relay device in which leaky coaxial cables of approximately the same length are connected to the base station side and the mobile station side, respectively, and relay communication data transmitted and received between the base station and the mobile station via the leaky coaxial cable, from the base station side A first demultiplexer that distributes the continuously transmitted transmission radio wave to the first amplifying unit and transmits the amplified radio wave amplified by the second amplifying unit toward the base station, and the amplified transmission of the first amplifying unit A second demultiplexer for transmitting radio waves to the mobile station and distributing the transmission radio waves transmitted from the mobile station side to the second amplifying unit ; transmission radio waves for communication continuously transmitted from the base station side gain adjustment signal to that control means supplies to control the gain of the first amplifying unit so that the output level of the first amplifying unit becomes constant based on the transmission of the first duplexer is towards the base station Transmitted radio wave amplified by the second amplifying unit Relay apparatus characterized by comprising a variable gain means for varying by said gain adjustment signal. 制御手段は、第１増幅部の出力を検波した信号と所定の利得基準との比較結果に応じたゲイン調整信号を出力することを特徴とする請求項１に記載の中継装置。   2. The relay apparatus according to claim 1, wherein the control unit outputs a gain adjustment signal corresponding to a comparison result between a signal obtained by detecting the output of the first amplifying unit and a predetermined gain reference. 制御手段は、第１増幅部の所定周波数帯域の出力を検波した信号と所定の利得基準との比較結果に応じたゲイン調整信号を出力することを特徴とする請求項１に記載の中継装置。   2. The relay apparatus according to claim 1, wherein the control unit outputs a gain adjustment signal according to a comparison result between a signal obtained by detecting an output of a predetermined frequency band of the first amplification unit and a predetermined gain reference. 基地局側及び移動局側にそれぞれ略同じ長さの漏洩同軸ケーブルが接続され、基地局及び移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置において、基地局側から連続的に送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から連続的に送信された通信のための送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器の基地局側に設けられ、上記第１分波器が上記第１増幅部へ分配する送信電波及び上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を可変する可変利得手段を備え、
上記可変利得手段は、上記第１分波器が上記第１増幅部へ分配する送信電波及び上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変することを特徴とする中継装置。 In a relay device in which leaky coaxial cables of approximately the same length are connected to the base station side and the mobile station side, respectively, and relay communication data transmitted and received between the base station and the mobile station via the leaky coaxial cable, from the base station side A first demultiplexer that distributes the continuously transmitted transmission radio wave to the first amplifying unit and transmits the amplified radio wave amplified by the second amplifying unit toward the base station, and the amplified transmission of the first amplifying unit A second demultiplexer for transmitting radio waves to the mobile station and distributing the transmission radio waves transmitted from the mobile station side to the second amplifying unit ; transmission radio waves for communication continuously transmitted from the base station side And a control means for supplying a gain adjustment signal for controlling a gain of the first amplifying unit so that an output level of the first amplifying unit is constant , provided on the base station side of the first demultiplexer, first duplexer is divided into the first amplifying unit A variable gain means for transmitting radio waves and the first duplexer is varied a transmission radio wave in which the second amplifier to be transmitted toward the base ground station has amplified,
The variable gain means includes the transmission radio wave distributed by the first demultiplexer to the first amplification unit and the transmission radio wave amplified by the second amplification unit transmitted by the first demultiplexer to the base station. A relay apparatus that is variable by a gain adjustment signal . 制御手段は、第１増幅部の出力を検波した信号と所定の利得基準との比較結果に応じて可変利得手段の利得を制御することを特徴とする請求項４に記載の中継装置。   5. The relay apparatus according to claim 4, wherein the control means controls the gain of the variable gain means according to a comparison result between a signal obtained by detecting the output of the first amplifying unit and a predetermined gain reference. 基地局及び移動局間で送受信する通信データを漏洩同軸ケーブルを介して中継する中継装置において、基地局側から送信された送信電波を第１増幅部へ分配すると共に、第２増幅部の増幅した送信電波を基地局へ向けて送信する第１分波器、上記第１増幅部の増幅した送信電波を移動局へ向けて送信すると共に移動局側から送信された送信電波を上記第２増幅部へ分配する第２分波器、基地局側から送信された送信電波に基づき上記第１増幅部の出力レベルが一定になるように上記第１増幅部のゲインを制御するゲイン調整信号を供給する制御手段、上記第１分波器が基地局へ向けて送信する上記第２増幅部が増幅した送信電波を上記ゲイン調整信号により可変する可変利得手段、上記第１増幅部の出力する一部の送信電波を抽出して上記第２増幅部へ出力する入力手段、上記第２増幅部により増幅された、上記入力手段が出力した上記第１増幅部の出力する一部の送信電波に基づき上記第２増幅部のゲインを調整する調整手段を備えたことを特徴とする中継装置。 A relay apparatus for relaying through a leakage mode coaxial cable communication data transmitted and received between the base station and the mobile station, while distributing the transmission radio wave transmitted from the base station side to the first amplifying unit, amplifies the second amplifier A first demultiplexer for transmitting the transmitted radio wave toward the base station, and transmitting the radio wave transmitted from the first amplifying unit toward the mobile station and the second radio wave transmitted from the mobile station side. A second demultiplexer that distributes the signal to the unit, and a gain adjustment signal that controls the gain of the first amplifying unit based on the transmission radio wave transmitted from the base station side so that the output level of the first amplifying unit becomes constant to that control means, said first duplexer variable gain means for varying by said gain adjustment signal to transmission radio wave in which the second amplifier is amplified to be transmitted to the base station, and outputs of the first amplifying unit Extract some transmitted radio waves Input means for outputting to the amplifying unit, the amplified by the second amplifying unit, to adjust the gain of the second amplifier on the basis of a part of the transmission wave output from the first amplifying unit which the input means is output adjustment Means comprising a relay device. 入力手段が抽出する第１増幅部の出力する一部の送信電波は、移動局が送信する送信電波と異なる所定周波数帯域の送信電波であり、調整手段は、第２増幅部の出力する所定周波数帯域の送信電波と所定の利得基準との比較結果に応じて上記第２増幅部のゲインを調整することを特徴とする請求項６に記載の中継装置。   The part of the transmission radio wave output from the first amplification unit extracted by the input means is a transmission radio wave having a predetermined frequency band different from the transmission radio wave transmitted by the mobile station, and the adjustment unit is configured to output the predetermined frequency output from the second amplification unit. The relay apparatus according to claim 6, wherein the gain of the second amplifying unit is adjusted in accordance with a comparison result between a transmission wave in a band and a predetermined gain reference. 基地局、base station,
上記基地局と通信データを送受信する移動局、A mobile station that transmits and receives communication data to and from the base station,
上記基地局及び上記移動局が送信する送信電波を搬送する、それぞれ略同じ長さの複数の漏洩同軸ケーブル、A plurality of leaky coaxial cables, each carrying substantially the same length, that carry transmission radio waves transmitted by the base station and the mobile station;
上記基地局側及び上記移動局側に上記漏洩同軸ケーブルが接続され、上記基地局及び上記移動局間で送受信する通信データを上記漏洩同軸ケーブルを介して中継する中継装置を備え、The leaky coaxial cable is connected to the base station side and the mobile station side, and includes a relay device that relays communication data transmitted and received between the base station and the mobile station via the leaky coaxial cable,
上記中継装置は、The relay device is
請求項１乃至７のいずれか１項に記載の中継装置であることを特徴とする無線通信システム。A wireless communication system, comprising the relay device according to claim 1.
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