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JPH09200840A - Private wireless communication system - Google Patents

Private wireless communication system

Info

Publication number
JPH09200840A
JPH09200840A JP8005131A JP513196A JPH09200840A JP H09200840 A JPH09200840 A JP H09200840A JP 8005131 A JP8005131 A JP 8005131A JP 513196 A JP513196 A JP 513196A JP H09200840 A JPH09200840 A JP H09200840A
Authority
JP
Japan
Prior art keywords
base station
line
optical
signal
transmission line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8005131A
Other languages
Japanese (ja)
Inventor
Osamu Chiba
修 千葉
Yoshihiro Imashiyou
義弘 今荘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Denki Electric Inc
Original Assignee
Kokusai Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kokusai Electric Co Ltd filed Critical Kokusai Electric Co Ltd
Priority to JP8005131A priority Critical patent/JPH09200840A/en
Publication of JPH09200840A publication Critical patent/JPH09200840A/en
Pending legal-status Critical Current

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  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

(57)【要約】 【課題】 広帯域、長距離伝送が可能な構内無線通信シ
ステムを実現する。 【解決手段】 基地局２０と回線補償装置５０Ａ、５０
Ｂ、…とを光ファイバ９０、９１、…で接続する。音
声、映像等の各信号は周波数多重化したのち光信号に変
換して光ファイバを介して送信し、受信側ではその逆の
処理で復調する。各回線補償装置５０Ａ、５０Ｂ、…及
び基地局２０は、音声信号の変調波をアンテナで送受し
て構内通信を行う。 (57) [Abstract] [PROBLEMS] To realize a local wireless communication system capable of wideband and long-distance transmission. SOLUTION: A base station 20 and line compensation devices 50A, 50
, And B are connected by optical fibers 90, 91, .... Each signal such as voice and video is frequency-multiplexed, converted into an optical signal and transmitted through an optical fiber, and the receiving side demodulates by the reverse process. Each of the line compensating devices 50A, 50B, ... And the base station 20 transmits / receives a modulated wave of a voice signal by an antenna to perform local communication.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、構内無線通信シス
テムに係り、とくに光ファイバ伝送を利用した構内無線
通信システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private wireless communication system, and more particularly to a private wireless communication system using optical fiber transmission.

【０００２】[0002]

【従来の技術】従来の構内無線通信システムは、例えば
（財）電波システム開発センターの標準規格「空中線電
力１ｍＷ以下の陸上移動業務の無線局（作業連絡用）の
無線設備」（ＲＣＲ ＳＴＤ−３１）において技術基準
が規定されている。これは図９に示すように、操作器９
１０、基地局９２０、回線補償装置９５０Ａ、９５０
Ｂ、…、携帯機９６０より構成され、基地局９２０と回
線補償装置９５０Ａ、９５０Ｂ、…は同軸ケーブル９８
０Ａ、９８０Ｂで結ばれている。2. Description of the Related Art A conventional radio communication system in a premises is, for example, a radio communication system development center standard "Radio equipment for radio stations (for work communication) of land mobile business with antenna power of 1 mW or less" (RCR STD-31). ) Specifies technical standards. This is shown in FIG.
10, base station 920, line compensation devices 950A, 950
.., a mobile device 960, and the base station 920 and the line compensators 950A, 950B ,.
It is tied with 0A and 980B.

【０００３】図１０は、基地局９２０及び回線補償装置
９５０Ａの詳細構成を示したもので、下り回線では、操
作器９１０からの音声信号を変調回路（ＭＯＤ）９２２
により変調し、増幅器９２５で増幅したのち分配回路９
２８と方向性結合器９２７、９３０によって、空中線
（アンテナ）９２１と回線補償装置９５０Ａへの信号に
分割する。回線補償装置９５０Ａでは、方向性結合器９
５２、増幅器９５３を経由し、分配回路９５６と方向性
結合器９５５、９５８によって、空中線９５１への送信
信号と次の回線補償装置９５０Ｂへの信号に分割する。FIG. 10 shows a detailed configuration of the base station 920 and the line compensator 950A. In the downlink, a voice signal from the operation unit 910 is modulated by a modulation circuit (MOD) 922.
And the distribution circuit 9 after amplifying by the amplifier 925.
28 and the directional couplers 927 and 930 divide the signals into the antenna (antenna) 921 and the line compensator 950A. In the line compensator 950A, the directional coupler 9
52 and an amplifier 953, and is divided into a transmission signal to the antenna 951 and a signal to the next line compensator 950B by a distribution circuit 956 and directional couplers 955 and 958.

【０００４】一方、上り信号では、回線補償装置９５０
Ａの方向性結合器９５５と結合回路９５７で空中線９５
１からの受信信号と回線補償装置９５０Ｂからの信号と
の結合を行い、増幅器９５４で増幅したのち方向性結合
器９５２を経由して基地局９２０に送信する。基地局９
２０では、結合回路９２９と方向性結合器９２７によっ
て回線補償装置９５０Ａからの信号と空中線９２１から
の受信信号との結合を行い、これを増幅器９２６で増幅
したのち各携帯機からの周波数に応じて分配回路９２４
で信号を分配し、復調回路（ＤＥＭＯＤ）９２３によっ
て復調する。On the other hand, in the case of upstream signals, the line compensator 950
The antenna 95 with the directional coupler 955 and the coupling circuit 957 of A.
The received signal from 1 and the signal from the line compensator 950B are combined, amplified by the amplifier 954, and then transmitted to the base station 920 via the directional coupler 952. Base station 9
In FIG. 20, the coupling circuit 929 and the directional coupler 927 couple the signal from the line compensator 950A with the received signal from the antenna 921, amplify this by the amplifier 926, and then according to the frequency from each portable device. Distribution circuit 924
The signal is distributed by and is demodulated by the demodulation circuit (DEMOD) 923.

【０００５】回線補償装置９５０Ｂ、…等の構成も上記
の回線補償装置９５０Ａと同じ構成であって、基地局の
操作器９１０と、各回線補償装置９５０Ａ、９５０Ｂ、
…を介して接続される複数の携帯機との間の１：ｎ（ｎ
≧１）の双方向通話、及び複数の携帯機同志の間での、
基地局を介しての双方向通話が行える。The line compensators 950B, ... Have the same structure as the above-mentioned line compensator 950A. The operation unit 910 of the base station and the line compensators 950A, 950B ,.
1: n (n with a plurality of portable devices connected via ...
≧ 1) two-way call, and between multiple mobile handsets,
Two-way communication is possible via the base station.

【０００６】[0006]

【発明が解決しようとする課題】上記した従来の構内無
線通信システムでは、基地局と回線補償装置及び回線補
償装置間を接続する回線９８０Ａ、９８０Ｂ、…に同軸
ケーブルを使用している。このため、それらの回線の距
離に限界があって、そのままでは広大な構内の場合に対
応できず、また送受信信号も音声信号に限られていた。In the above-mentioned conventional indoor radio communication system, coaxial cables are used for the lines 980A, 980B, ... Connecting the base station with the line compensator and the line compensator. For this reason, there is a limit in the distance between these lines, and it is not possible to cope with the case of a vast premises as it is, and the transmission / reception signal is limited to a voice signal.

【０００７】本発明の目的は、広帯域、長距離伝送を可
能にし、音声信号だけでなく映像信号、データ信号など
を一括して伝送することを可能とする、構内無線通信シ
ステムを提供することにある。It is an object of the present invention to provide a local wireless communication system which enables wide band and long distance transmission and collectively transmits not only audio signals but also video signals, data signals and the like. is there.

【０００８】[0008]

【課題を解決するための手段】本発明は、少なくとも１
つの音声信号及び少なくとも１つの映像信号によって互
いに周波数の異なるキャリアを変調し、その変調波を含
む複数の変調波を周波数多重化したのちアナログ光変調
して光伝送路へ送出するとともに、アナログ光変調され
た光信号を光伝送路から受信してアナログ光復調により
周波数多重化された電気信号へ変換し、この電気信号の
各周波数成分を分離したのち復調して音声信号及び映像
信号を取り出すように構成された基地局と、前記基地局
から光伝送路を介して送出されてきたアナログ光変調信
号を受信してアナログ光復調により周波数多重化された
電気信号に変換し、この電気信号の各周波数成分を分離
したのち、音声変調波は付設されたアンテナから送出
し、また映像変調波は復調して映像信号を取り出すとと
もに、少なくとも１つの映像信号により１つのキャリア
を変調し、前記付設されたアンテナで受信した音声変調
波及び前記映像信号による変調波を含む複数の変調波を
周波数多重化したのちアナログ光変調して光伝送路を介
して前記基地局へ送信するように構成した回線補償装置
の複数個と、を備えたことを特徴とする構内無線通信シ
ステムを開示する。SUMMARY OF THE INVENTION The present invention provides at least one
Carriers having different frequencies are modulated by one audio signal and at least one video signal, and a plurality of modulated waves including the modulated waves are frequency-multiplexed, and then analog optical modulation is performed and the analog transmission is performed on the optical transmission path. The received optical signal is received from the optical transmission line, converted into a frequency-multiplexed electric signal by analog optical demodulation, and each frequency component of this electric signal is separated and then demodulated to extract an audio signal and a video signal. The configured base station and the analog optical modulation signal sent from the base station via the optical transmission line are received and converted into frequency-multiplexed electric signals by analog optical demodulation, and each frequency of this electric signal After separating the components, the audio modulated wave is sent out from the attached antenna, and the video modulated wave is demodulated to extract the video signal and at least 1 One carrier is modulated by the video signal of, and a plurality of modulated waves including a voice modulated wave received by the attached antenna and a modulated wave by the video signal are frequency-multiplexed, and then analog optical modulation is performed to form an optical transmission line. And a plurality of line compensators configured to transmit to the base station via the local radio communication system.

【０００９】[0009]

【発明の実施の形態】以下、本発明をその実施の形態に
沿って説明する。図２は、本発明になる構内無線通信シ
ステムの第１の実施の形態を示す概略ブロック図で、基
地局２０と回線補償装置５０Ａ、５０Ｂ、…のそれぞれ
の間を２本の光ファイバ９０〜９３で結んだ場合であ
る。これらの光ファイバはそれぞれ下り、上り信号を伝
送する。図１は、基地局２０及び回線補償装置５０Ａの
より詳細な構成を示すもので、基地局２０には、多数の
音声信号や映像信号、データ信号などの多重・分配・変
復調回路４０を設け、さらに回線補償装置５０Ａ、…に
も同様に多重・分配・変復調回路７０を設け、これらの
多様な信号の送受信を、伝送帯域を広く使える光ファイ
バ経由で送受信できるようにしている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to its embodiments. FIG. 2 is a schematic block diagram showing a first embodiment of the local area radio communication system according to the present invention, in which two optical fibers 90 are provided between the base station 20 and the line compensators 50A, 50B ,. This is the case when tied at 93. Each of these optical fibers transmits a downstream signal and an upstream signal. FIG. 1 shows a more detailed configuration of the base station 20 and the line compensation device 50A. The base station 20 is provided with a multiplex / distribution / modulation / demodulation circuit 40 for a large number of audio signals, video signals, data signals, and the like. Further, the line compensating device 50A, ... Is similarly provided with a multiplexing / distribution / modulation / demodulation circuit 70 so that transmission / reception of these various signals can be transmitted / received via an optical fiber which can use a wide transmission band.

【００１０】また、基地局２０と回線補償装置５０Ａ間
は光ファイバ９０、９１で結ばれているため、下り系に
ついては、基地局２０で電光変換器（Ｅ／Ｏ）３１によ
ってアナロ光変調により電気信号から光信号へ変換後に
伝送し、回線補償装置５０Ａでは、下り光信号を方向性
結合器５９によって次の回線補償装置５０Ｂへの信号と
自装置への信号とに分け、自装置内への光信号は光電変
換器（Ｅ／Ｏ）６１によって電気信号に変換する。一
方、上り系については、回線補償装置５０では電光変換
器（Ｅ／Ｏ）６２によってアナロ光変調を用いて電気信
号から光信号への変換を行い、方向性結合器６０によっ
て別の回線補償装置５０Ｂからの上り光信号と結合を行
って基地局２０に送信し、基地局２０では光電変換器
（Ｏ／Ｅ）３２によって光信号を電気信号に変換する。
回線補償装置５０Ｂ、…等の構成も回線補償装置５０Ａ
と同じである。Further, since the base station 20 and the line compensator 50A are connected by the optical fibers 90 and 91, for the downstream system, the base station 20 uses the electro-optical converter (E / O) 31 to perform analog light modulation. The signal is converted into an optical signal and then transmitted. In the line compensator 50A, the downlink optical signal is divided into a signal to the next line compensator 50B and a signal to the own device by the directional coupler 59, and the signal is sent to the own device. Is converted into an electric signal by a photoelectric converter (E / O) 61. On the other hand, regarding the upstream system, in the line compensator 50, an electric signal (E / O) 62 is used to convert an electric signal into an optical signal by using analog optical modulation, and the directional coupler 60 is used for another line compensator. The signal is combined with the upstream optical signal from 50B and transmitted to the base station 20, and in the base station 20, the optical signal is converted into an electric signal by the photoelectric converter (O / E) 32.
The line compensator 50B has the same structure as the line compensator 50A.
Is the same as

【００１１】なお、図１にて符号２５、２６、５３、５
４は増幅器を、符号２８は分配回路を、符号２９は結合
回路を、符号２７、５５は方向性結合器を、さらに符号
２１、５１は空中線を表しており、これらは図１０の従
来構成と同様な作用をする。In FIG. 1, reference numerals 25, 26, 53 and 5
Reference numeral 4 represents an amplifier, reference numeral 28 represents a distribution circuit, reference numeral 29 represents a coupling circuit, reference numerals 27 and 55 represent directional couplers, and reference numerals 21 and 51 represent antennas. Has the same effect.

【００１２】図３は、基地局２０内の多重・分配・変復
調回路４０の詳細な構成例を示すブロック図で、送信側
では変調回路４１により、音声、映像、データの各信号
により各々適当な周波数ｆa、ｆv、ｆdの変調波を生成
し、周波数多重化回路４３で多重化する。一方、受信側
では、周波数多重化された信号を分配回路４４で分離
し、各周波数ｆaA、…ｆdBの変調信号に対して復調回路
４２により復調を行う。なお、この例では送信側の入力
信号がそれぞれ１つづつの場合を示しているが、複数の
種類の場合にも適用できることは云うまでもない。また
上記の受信側の入力の周波数ｆaA、…ｆdB等に付された
添字Ａ、Ｂ、…は、各回線補償装置を表す符号５０Ａ、
５０Ｂ、…のＡ、Ｂ、…に対応し、例えばｆaAは回線補
償装置５０Ａからの音声信号、ｆdBは回線補償装置５０
Ｂからのデータ信号をそれぞれ表すものとする。FIG. 3 is a block diagram showing a detailed configuration example of the multiplexing / distribution / modulation / demodulation circuit 40 in the base station 20. On the transmission side, a modulation circuit 41 is used to select an appropriate signal for each of audio, video and data. Modulated waves of frequencies f a , f v , and f d are generated and multiplexed by the frequency multiplexing circuit 43. On the other hand, on the receiving side, the frequency-multiplexed signal is separated by the distribution circuit 44, and the demodulation circuit 42 demodulates the modulated signal of each frequency f aA , ..., F dB . In this example, one input signal on the transmitting side is shown, but it goes without saying that the present invention can be applied to a plurality of types. The above reception side of the input frequency f aA, ... subscripts A attached to f dB, etc., B, ..., the code 50A representing each channel compensation device,
50B, ..., A, B, ..., For example, f aA is the voice signal from the line compensator 50A, and f dB is the line compensator 50.
Each of the data signals from B is represented.

【００１３】図４は、各回線補償装置の多重・分配・変
復調回路７０の詳細な構成例を示すブロック図で、受信
側では周波数多重化された信号を分配回路７３で分離
し、その分離した各周波数ｆv、ｆd、ｆaの信号に対し
て復調回路７１により復調を行う。一方、送信側では、
変調回路７２により、すでに変調波としてアンテナ５１
から受信されている音声信号を除いて、映像、データ信
号により各々適当な周波数ｆvA、ｆdAの変調波を生成
し、多重化回路７４で多重化して送信する。なお、各回
線補償装置からの信号を音声（添字ａ）、映像（添字
ｖ）、データ（添字ｄ）それぞれ１個づつとしたが、こ
れらの一部又は全部が複数であってもよく、その場合は
基地局２０の多重・分配・変復調回路４０もそれに対応
した構成とすればよい。以上の構成によれば、光ファイ
バの長距離・広帯域の伝送特性を利用することで、広い
構内で多数の回線補償装置を用いるシステムでも容易に
実現可能で、かつ音声以外の、映像やデータ信号の伝送
も可能になる。FIG. 4 is a block diagram showing a detailed configuration example of the multiplexing / distribution / modulation / demodulation circuit 70 of each line compensation device. On the receiving side, the frequency-multiplexed signal is separated by the distribution circuit 73 and then separated. each frequency f v, perform demodulation by the demodulation circuit 71 with respect to f d, f a signal. On the other hand, on the sending side,
The modulation circuit 72 allows the antenna 51 to generate a modulated wave.
Except for the audio signal received from, the modulated waves of appropriate frequencies f vA and f dA are respectively generated by the video and data signals, multiplexed by the multiplexing circuit 74 and transmitted. It should be noted that the signal from each line compensator is one each for voice (subscript a), video (subscript v), and data (subscript d), but some or all of these may be plural. In this case, the multiplex / distribution / modulation / demodulation circuit 40 of the base station 20 may have a configuration corresponding thereto. According to the above configuration, by utilizing the long-distance / broadband transmission characteristics of the optical fiber, it can be easily realized in a system using a large number of line compensators in a wide premises, and a video or data signal other than voice can be obtained. Can also be transmitted.

【００１４】図５は、本発明になる構内無線通信システ
ムの別の実施の形態を示すブロック図で、基地局２０と
回線補償装置５０Ａ、及び各回線補償装置の間を１本の
光ファイバで接続するようにしたものである。このため
に、図１の構成に対して、基地局２０内に方向性結合器
３３を設け、また回線補償装置５０Ａの方向性結合器５
９、６０に代わって方向性結合器６３を設け、これらに
よって１本の光ファイバで各装置間の双方向通信を行え
るようにしたものであり、図１の場合と同様な効果が得
られる。なお、さらに別の変形例としては、上り、下り
方向で用いる光信号の波長を変え、これによって上下方
向の信号分離を行うようにすることもできる。FIG. 5 is a block diagram showing another embodiment of the indoor radio communication system according to the present invention, in which one optical fiber is provided between the base station 20, the line compensator 50A, and each line compensator. It is designed to be connected. To this end, a directional coupler 33 is provided in the base station 20 as compared with the configuration of FIG. 1, and the directional coupler 5 of the line compensation device 50A is provided.
A directional coupler 63 is provided in place of 9, 60, so that bidirectional communication between the respective devices can be performed with one optical fiber, and the same effect as in the case of FIG. 1 can be obtained. As yet another modification, the wavelengths of the optical signals used in the up and down directions may be changed so that the up / down direction signal separation is performed.

【００１５】図６は、本発明になる構内無線通信システ
ムのさらに別の実施の形態を示すブロック図で、複数の
回線補償装置５０Ａ、５０Ｂ、５０Ｃ、…が基地局２０
に対してスター状に光ファイバ９０Ａ、９１Ａ、９０
Ｂ、９１Ｂ、９０Ｃ、９１Ｃ、…で接続されて成る構成
である。FIG. 6 is a block diagram showing another embodiment of the local area radio communication system according to the present invention, in which a plurality of line compensating devices 50A, 50B, 50C, ...
The star-shaped optical fibers 90A, 91A, 90
B, 91B, 90C, 91C, ... Are connected.

【００１６】図７は、この場合の基地局２０と回線補償
装置５０Ａのより詳細な構成を示しており、他の回線補
償装置５０Ｂ、５０Ｃ、…も回線補償装置５０Ａと同じ
である。図７の構成は、図１と同様に基地局と回線補償
装置間を２本の光ファイバ９０Ａ、９１Ａで結んでいる
が、他の回線補償装置も直接基地局へ接続できるように
スターカプラ３４、３５が基地局２０に設けられている
点が異なっており、また回線補償装置の構成は、基地局
２０とのみ接続すればよいので、図１の方向性結合器５
９、６０が不要になっている点が異なっている。動作と
しては図１と同じ効果がある。FIG. 7 shows a more detailed structure of the base station 20 and the line compensator 50A in this case, and the other line compensators 50B, 50C, ... Are the same as the line compensator 50A. In the configuration of FIG. 7, the base station and the line compensator are connected by two optical fibers 90A and 91A as in the case of FIG. 1, but the star coupler 34 is also provided so that other line compensators can be directly connected to the base station. , 35 are provided in the base station 20, and since the line compensator need only be connected to the base station 20, the directional coupler 5 of FIG.
The difference is that 9 and 60 are not required. The operation has the same effect as in FIG.

【００１７】図８は、図６、図７で示した実施の形態
を、光ファイバ１本で上り、下りを兼用するように構成
したもので、この場合には、基地局２０のスターカプラ
３６がスター結合と同時に双方向の伝送を可能としてお
り、さらに回線補償装置５０Ａには方向性結合器６４を
設けて、こちらも双方向の伝送を可能なようにしている
点が図７の構成と異なっている。動作上は、やはり図１
の構成と同様な効果が得られる。FIG. 8 shows a configuration of the embodiment shown in FIGS. 6 and 7 in which one optical fiber is used for both upstream and downstream. In this case, the star coupler 36 of the base station 20 is used. Is capable of bidirectional transmission at the same time as star coupling, and the line compensator 50A is further provided with a directional coupler 64, which also enables bidirectional transmission. Is different. As for operation,
An effect similar to that of the configuration can be obtained.

【００１８】[0018]

【発明の効果】従来、構内無線通信システムにおいて使
われていた同軸ケーブルを光ファイバに置き換えること
によって、広帯域、長距離の伝送が可能となり、多重・
分配回路を用いることによって音声信号だけでなく、映
像信号、データ信号など多種の信号伝送が可能となる。
また、光ファイバを用いるため、同軸ケーブルとは違い
漏話の心配がなく、他の伝送媒体に影響を及ぼさず、ま
た外部よりの影響を受けないという利点がある。更に、
光ファイバは同軸ケーブルに比べ細径、軽量であるた
め、敷設コストを低減できるとともに柔軟な線路網の構
築が可能となる。これらの効果により、カメラによる構
内監視システム等の構築が構内無線通信システムを用い
ることによって容易に実現可能となる。By replacing the coaxial cable which has been conventionally used in the indoor wireless communication system with the optical fiber, it becomes possible to transmit a wide band and a long distance.
By using the distribution circuit, not only audio signals but also various signals such as video signals and data signals can be transmitted.
Further, since an optical fiber is used, there is an advantage that unlike a coaxial cable, there is no fear of crosstalk, it does not affect other transmission media, and it is not affected by the outside. Furthermore,
Since the optical fiber has a smaller diameter and lighter weight than the coaxial cable, the laying cost can be reduced and a flexible line network can be constructed. Due to these effects, it is possible to easily construct a premises monitoring system or the like using a camera by using a premises wireless communication system.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明になる構内無線通信システムを構成する
基地局及び回線補償装置の実施の形態の一例を示すブロ
ック図である。FIG. 1 is a block diagram showing an example of an embodiment of a base station and a channel compensating apparatus which compose a private wireless communication system according to the present invention.

【図２】図１の基地局及び回線補償装置を用いた構内無
線通信システムの構成図である。FIG. 2 is a configuration diagram of a private wireless communication system using the base station and the line compensation device of FIG.

【図３】基地局に設けられた多重・分配・変復調回路の
詳細構成例を示す図である。FIG. 3 is a diagram showing a detailed configuration example of a multiplexing / distribution / modulation / demodulation circuit provided in a base station.

【図４】回線補償装置に設けられた多重・分配・変復調
回路の詳細構成例を示す図である。FIG. 4 is a diagram showing a detailed configuration example of a multiplexing / distribution / modulation / demodulation circuit provided in the line compensation device.

【図５】図１の実施の形態の変形例を示すブロック図で
ある。FIG. 5 is a block diagram showing a modification of the embodiment of FIG.

【図６】本発明になる構内無線通信システムの実施の形
態の他の例を示すブロック図である。FIG. 6 is a block diagram showing another example of the embodiment of the local area radio communication system according to the present invention.

【図７】図６の実施の形態を構成する基地局及び回線補
償装置の構成例を示すブロック図である。FIG. 7 is a block diagram showing a configuration example of a base station and a channel compensating apparatus which constitute the embodiment of FIG.

【図８】図６の実施の形態の変形例に対応する基地局及
び回線補償装置の構成例を示すブロック図である。FIG. 8 is a block diagram showing a configuration example of a base station and a channel compensation device corresponding to a modification of the embodiment of FIG.

【図９】従来の構内無線通信システムの概略図である。FIG. 9 is a schematic diagram of a conventional indoor radio communication system.

【図１０】従来の構内無線通信システムの構成図であ
る。FIG. 10 is a block diagram of a conventional indoor radio communication system.

【符号の説明】[Explanation of symbols]

２０ 基地局 ２１、５１ 空中線 ３１、６２ 電光変換器 ３２、６１ 光電変換器 ３３、５９、６０、６３、６４ 方向性結合器 ３４、３５、３６ スターカプラ ４０、７０ 多重・分配・変復調回路 ５０Ａ、５０Ｂ、５０Ｃ 回線補償装置 ９０、９１、９２、９３ 光ファイバ ９０Ａ、９０Ｂ、９０Ｃ、９１Ａ、９１Ｂ、９１Ｃ 光
ファイバ20 base station 21, 51 antenna 31, 62 electro-optical converter 32, 61 photoelectric converter 33, 59, 60, 63, 64 directional coupler 34, 35, 36 star coupler 40, 70 multiplex / distribution / modulation / demodulation circuit 50A, 50B, 50C Line compensator 90, 91, 92, 93 Optical fiber 90A, 90B, 90C, 91A, 91B, 91C Optical fiber

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 10/06 Ｈ０４Ｑ 3/58 １０１ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location H04B 10/06 H04Q 3/58 101

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 少なくとも１つの音声信号及び少なくと
も１つの映像信号によって互いに周波数の異なるキャリ
アを変調し、その変調波を含む複数の変調波を周波数多
重化したのちアナログ光変調して光伝送路へ送出すると
ともに、アナログ光変調された光信号を光伝送路から受
信してアナログ光復調により周波数多重化された電気信
号へ変換し、この電気信号の各周波数成分を分離したの
ち復調して音声信号及び映像信号を取り出すように構成
された基地局と、 前記基地局から光伝送路を介して送出されてきたアナロ
グ光変調信号を受信してアナログ光復調により周波数多
重化された電気信号に変換し、この電気信号の各周波数
成分を分離したのち、音声変調波は付設されたアンテナ
から送出し、また映像変調波は復調して映像信号を取り
出すとともに、少なくとも１つの映像信号により１つの
キャリアを変調し、前記付設されたアンテナで受信した
音声変調波及び前記映像信号による変調波を含む複数の
変調波を周波数多重化したのちアナログ光変調して光伝
送路を介して前記基地局へ送信するように構成した回線
補償装置の複数個と、 を備えたことを特徴とする構内無線通信システム。1. A carrier having different frequencies is modulated by at least one audio signal and at least one video signal, a plurality of modulated waves including the modulated waves are frequency-multiplexed, and then analog optical modulation is performed to an optical transmission line. Along with sending out, the analog optical modulated optical signal is received from the optical transmission line and converted into a frequency-multiplexed electric signal by analog optical demodulation, and each frequency component of this electric signal is separated and then demodulated to produce a voice signal. And a base station configured to extract a video signal, and receives an analog optical modulation signal transmitted from the base station via an optical transmission line and converts the analog optical demodulation signal into a frequency-multiplexed electrical signal by analog optical demodulation. After separating each frequency component of this electrical signal, the audio modulated wave is sent out from the attached antenna, and the video modulated wave is demodulated to obtain the video signal. At the same time, one carrier is modulated by at least one video signal, and a plurality of modulation waves including a voice modulation wave received by the attached antenna and a modulation wave by the video signal are frequency-multiplexed and then analog optical modulation is performed. A plurality of line compensators configured to transmit to the base station via an optical transmission line, and a local wireless communication system. 【請求項２】 前記光伝送路は、前記基地局と前記複数
の回線補償装置とを前記基地局を一端として縦属接続
し、かつ前記基地局からの下り回線と前記基地局へ向か
う上り回線とは別の光ファイバ伝送路で構成されるとと
もに、 前記回線補償装置の各々は、前記下り回線の光ファイバ
伝送路から受信した光信号の一部を自装置内へ取り込み
残りを下流の回線補償装置へ送るための方向性結合器
と、前記上り回線の光ファイバ伝送路から受信した光信
号と自装置内で生成した光信号とを合成して上流の回線
補償装置又は基地局へ送出するための方向性結合器とを
備えたことを特徴とする請求項１に記載の構内無線通信
システム。2. The optical transmission line connects the base station and the plurality of line compensators in cascade connection with the base station as one end, and has a downlink from the base station and an uplink toward the base station. And an optical fiber transmission line different from the above, and each of the line compensating devices takes in a part of the optical signal received from the optical fiber transmission line of the downlink into its own device and compensates the rest for downstream line compensation. A directional coupler for sending to the equipment, and for combining the optical signal received from the upstream optical fiber transmission line and the optical signal generated in the own equipment and sending to the upstream line compensator or base station. The premises radio communication system according to claim 1, further comprising: 【請求項３】 前記光伝送路は、前記基地局と前記複数
の回線補償装置とを前記基地局を一端として縦属接続
し、かつ前記基地局からの下り回線と前記基地局へ向か
う上り回線とは一つの光ファイバ伝送路で構成されると
ともに、 前記回線補償装置の各々は、前記下り回線の光ファイバ
伝送路から受信した光信号の一部を自装置内へ取り込み
残りを下流の回線補償装置へ送るとともに、前記上り回
線の光ファイバ伝送路から受信した光信号と自装置内で
生成した光信号とを合成して上流の回線補償装置又は基
地局へ送出するための方向性結合器を備え、 前記基地局は、当該基地局で送受信する光信号を分離す
るための方向性結合器を備えたことを特徴とする請求項
１に記載の構内無線通信システム。3. The optical transmission line connects the base station and the plurality of line compensators in cascade connection with the base station as one end, and has a downlink from the base station and an uplink toward the base station. Is composed of one optical fiber transmission line, and each of the line compensators takes in a part of the optical signal received from the optical fiber transmission line of the downlink into its own device and compensates the rest for downstream line compensation. A directional coupler for sending to the device and combining the optical signal received from the upstream optical fiber transmission line with the optical signal generated in the own device and sending to the upstream line compensator or base station. The local radio communication system according to claim 1, wherein the base station includes a directional coupler for separating an optical signal transmitted and received by the base station. 【請求項４】 前記光伝送路は、前記基地局と前記回線
補償装置の各々とをスター状に接続し、かつ各基地局か
らの下り回線と各回線補償装置から基地局へ向かう上り
回線とは別の光ファイバ伝送路で構成されるとともに、 前記基地局は、前記送出する光信号を前記各回線補償装
置向けの光ファイバ伝送路へ分配するためのスターカプ
ラと、各回線補償装置からの光信号を結合して受信する
ためのスターカプラとを備えたことを特徴とする請求項
１に記載の構内無線通信システム。4. The optical transmission line connects the base station and each of the line compensating devices in a star pattern, and includes a downlink from each base station and an uplink from each line compensating device to the base station. Is composed of another optical fiber transmission line, and the base station distributes the optical signal to be transmitted to the optical fiber transmission line for each of the line compensating devices, and from each line compensating device. The indoor radio communication system according to claim 1, further comprising a star coupler for combining and receiving optical signals. 【請求項５】 前記光伝送路は、前記基地局と前記回線
補償装置の各々とをスター状に接続し、かつ各基地局か
らの下り回線と各回線補償装置から基地局へ向かう上り
回線とは各回線補償装置ごとに１つの光ファイバ伝送路
で構成されるとともに、 前記基地局は、前記送出する光信号を前記各回線補償装
置向けの光ファイバ伝送路へ分配し、かつ各回線補償装
置からの光信号を結合して受信するためのスターカプラ
を備え、 前記回線補償装置の各々は、当該回線補償装置が送受信
する光信号を分離するための方向性結合器を備えたこと
を特徴とする請求項１に記載の構内無線通信システム。5. The optical transmission line connects the base station and each of the line compensators in a star pattern, and includes a downlink from each base station and an uplink from each line compensator to the base station. Is composed of one optical fiber transmission line for each line compensation device, and the base station distributes the optical signal to be transmitted to the optical fiber transmission line for each line compensation device, and each line compensation device. And a star coupler for receiving the optical signal from the line compensator, wherein each of the line compensators includes a directional coupler for separating an optical signal transmitted and received by the line compensator. The private wireless communication system according to claim 1.
JP8005131A 1996-01-16 1996-01-16 Private wireless communication system Pending JPH09200840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8005131A JPH09200840A (en) 1996-01-16 1996-01-16 Private wireless communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8005131A JPH09200840A (en) 1996-01-16 1996-01-16 Private wireless communication system

Publications (1)

Publication Number Publication Date
JPH09200840A true JPH09200840A (en) 1997-07-31

Family

ID=11602767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8005131A Pending JPH09200840A (en) 1996-01-16 1996-01-16 Private wireless communication system

Country Status (1)

Country Link
JP (1) JPH09200840A (en)

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