JP2900853B2 - Wireless base station, wireless local area network, and optical fiber feeder - Google Patents
Wireless base station, wireless local area network, and optical fiber feederInfo
- Publication number
- JP2900853B2 JP2900853B2 JP7236469A JP23646995A JP2900853B2 JP 2900853 B2 JP2900853 B2 JP 2900853B2 JP 7236469 A JP7236469 A JP 7236469A JP 23646995 A JP23646995 A JP 23646995A JP 2900853 B2 JP2900853 B2 JP 2900853B2
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- Japan
- Prior art keywords
- optical
- signal
- wireless
- optical fiber
- antenna
- 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.)
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、サブキャリア多重
光伝送方式を用いた無線信号伝送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio signal transmission apparatus using a subcarrier multiplexing optical transmission system.
【０００２】[0002]
【従来の技術】移動無線電話のような無線通信システム
では、サービスエリアが複数の小エリアに分割され、各
小エリア毎に無線基地局が配置される。無線基地局は、
アンテナ部、無線信号を通話信号に変換する変復調部、
および無線チャンネルの制御をおこなう制御部等からな
り、さらに大きなエリアの回転制御をおこなう中央局に
ケーブルで接続される。一つの無線基地局が統括するエ
リアを小さくすれば、無線端末と無線基地局の送信出力
を低減し、かつ周波数使用効率を向上できるが、基地局
の数が膨大になるために基地局の小型化と高信頼化が求
められる。2. Description of the Related Art In a radio communication system such as a mobile radio telephone, a service area is divided into a plurality of small areas, and a radio base station is arranged for each small area. The radio base station
An antenna unit, a modem unit for converting a radio signal into a call signal,
And a control unit for controlling a radio channel, and is connected by a cable to a central office for controlling the rotation of a larger area. If the area controlled by one wireless base station is reduced, the transmission output of the wireless terminal and the wireless base station can be reduced, and the frequency use efficiency can be improved.However, since the number of base stations becomes enormous, the size of the base station becomes smaller. And high reliability are required.
【０００３】また、無線通信に使用する信号は、伝送信
号レートの大容量化と周波数資源の逼迫により、年々高
周波化が進んでいる。一般に無線信号の周波数が高くな
るにつれ、電波伝搬の直進性が強くなり、また構造物を
透過する際の吸収損が大きくなる。特に、都市部のよう
に建物が密集した区域や屋内などにおいては、電波伝搬
が構造物によって妨害を受けるため、無線信号の届きに
くい地帯（アンテナ不感地帯）が生じる。アンテナ不感
地帯に無線信号を供給するためには、無線基地局を増設
し、相互にケーブル接続すればよい。しかしながら、無
線基地局には無線信号の変復調器や制御装置などが含ま
れるため、装置の小型化や低コスト化が難しいという問
題があった。[0003] Further, the frequency of signals used for wireless communication is increasing year by year due to the increase in transmission signal rate and the tightness of frequency resources. In general, as the frequency of a radio signal increases, the straightness of radio wave propagation increases, and the absorption loss when passing through a structure increases. In particular, in an area where buildings are densely packed, such as in an urban area, or in an indoor area, a radio wave propagation is obstructed by a structure, so that a zone where a radio signal is difficult to reach (an antenna dead zone) occurs. In order to supply a radio signal to the antenna blind zone, radio base stations may be added and connected to each other via a cable. However, since the radio base station includes a radio signal modulator / demodulator, a control device, and the like, there has been a problem that it is difficult to reduce the size and cost of the device.
【０００４】そこで、無線基地局のアンテナ部の機能の
みを分離し、変復調部や制御部等は中央局に配置し、両
者を光ファイバで接続するという方法がある。この方法
は、たとえば渋谷らによる「光によるマイクロセル移動
通信の無線信号集配方式」電子情報通信学会、無線通信
システム研究会、ＲＣＳ９０−１２等の文献に詳細に記
されている。この方式では、無線基地局は光信号と電気
信号の変換および無線信号の増幅のみをおこなえばよい
ので、基地局の小型化と高信頼化が実現できる。Therefore, there is a method in which only the function of the antenna section of the radio base station is separated, the modulation / demodulation section, the control section, and the like are arranged in the central station, and both are connected by an optical fiber. This method is described in detail in Shibuya et al.'S documents such as "Wireless signal collection / distribution method of microcell mobile communication by light", IEICE, RCS90-12, RCS90-12, etc. In this method, since the wireless base station only needs to convert the optical signal and the electric signal and amplify the wireless signal, the size and the reliability of the base station can be reduced.
【０００５】一方無線ＬＡＮに関しても、同様に小型で
広帯域の光ファイバ伝送技術を用いたサービスエリア間
伝送装置が提案されている。光ファイバ伝送技術を無線
ＬＡＮシステムに適用した例としては、トーマス（Ｈ．
Ｔｈｏｍａｓ）らによる１９９２年電子情報通信学会秋
季大会、Ｂ−３３４等が挙げられる。[0005] On the other hand, with respect to wireless LANs, similarly, a transmission device between service areas using a small and wide band optical fiber transmission technology has been proposed. As an example of applying the optical fiber transmission technology to a wireless LAN system, Thomas (H.
Thomas, et al., 1992 Fall Meeting of the Institute of Electronics, Information and Communication Engineers, B-334.
【０００６】[0006]
【発明が解決しようとする課題】以上で説明した、従来
の光ファイバ伝送による無線信号の集配方式では、全て
の変復調器を中央局に集約し、各アンテナと中央局とを
光ファイバによって１対１に接続する構成をとってい
る。そのため、伝送距離は最大で２０km程度となり、フ
ァイバコア径が１０μm 以下のシングルモードファイバ
による伝送が必要である。また、光送信器の光源として
は、低雑音かつ低歪な分布帰還型レーザダイオードを用
いる必要がある。これらの理由により、従来のシステム
では導入コストが高くなるという問題があった。しか
し、前記のアンテナ不感地帯への無線信号の集配という
目的のために、近接エリアの無線基地局あるいは無線Ｌ
ＡＮ端末のアンテナへの無線信号を分岐し、アンテナ不
感地帯にアンテナを増設して、両者の間を光ファイバで
接続するという構成で実現できる。この場合に必要な伝
送距離は高々５００m 程度であるため、接続の容易な多
モードファイバや低コストのファブリ・ペローレーザダ
イオード等の適用が可能になる。In the conventional radio signal collection and distribution system using optical fiber transmission described above, all modems are centralized in a central station, and each antenna and central station are paired by an optical fiber. 1 is connected. Therefore, the transmission distance is about 20 km at the maximum, and transmission using a single mode fiber having a fiber core diameter of 10 μm or less is required. Further, it is necessary to use a low-noise and low-distortion distributed feedback laser diode as a light source of the optical transmitter. For these reasons, the conventional system has a problem that the introduction cost is high. However, for the purpose of collecting and delivering wireless signals to the above-mentioned antenna blind zone, a wireless base station or wireless L
It can be realized by a configuration in which a radio signal to the antenna of the AN terminal is branched, an antenna is added in an antenna blind zone, and the two are connected by an optical fiber. In this case, the required transmission distance is at most about 500 m, so that it is possible to apply a multimode fiber that can be easily connected or a low-cost Fabry-Perot laser diode.
【０００７】そこで、本発明は無線通信システムに於け
るアンテナ給電線に関し、低雑音で接続の容易な光伝送
路を低コストで提供し、アンテナ不感地帯に無線信号を
供給することを目的とする。Accordingly, the present invention relates to an antenna feed line in a wireless communication system, which aims to provide a low-noise, easily connectable optical transmission line at low cost and supply a radio signal to an antenna blind zone. .
【０００８】[0008]
【課題を解決するための手段】第１の発明の光ファイバ
給電線装置は、移動端末に対して無線信号を送受信する
アンテナと、該無線信号と通話信号とを変換する変復調
器と、該アンテナと変復調器の間を接続する光ファイバ
給電線から成り、該光ファイバ給電線は、無線信号を光
信号に変換する光送信器と、該光送信器の出力光信号を
伝送する光ファイバ伝送路と、該光ファイバ伝送路の出
力を無線信号に変換する光受信器によって構成される無
線基地局において、前記光ファイバ伝送路としてコア径
１００μｍ以上の多モード光ファイバを用いる無線基地
局における光ファイバ給電線装置であって、前記アンテ
ナから光送信器への入力無線信号と光受信器からアンテ
ナへの出力無線信号とを切り替える電気的なスイッチを
有し、また前記変調器から光送信器への入力無線信号と
光受信器から復調器への出力無線信号とを切り替える電
気的なスイッチを有することを特徴とする。SUMMARY OF THE INVENTION An optical fiber according to the first invention
The feed line device includes an antenna that transmits and receives a radio signal to and from a mobile terminal, a modem that converts the radio signal and a call signal, and an optical fiber feed line that connects the antenna and the modem. The optical fiber feed line includes an optical transmitter that converts a wireless signal into an optical signal, an optical fiber transmission line that transmits an optical signal output from the optical transmitter, and an optical fiber that converts the output of the optical fiber transmission line into a wireless signal. in the radio base station configured by the receiver, the radio base using multimode optical fiber over a core diameter 100μm as the optical fiber transmission line
An optical fiber feeder device in a station, comprising:
From the receiver to the optical transmitter and the antenna from the optical receiver.
Electrical switch to switch between the output radio signal to
Having an input radio signal from the modulator to the optical transmitter;
An electric signal for switching between the optical receiver and the output radio signal to the demodulator.
It has a mechanical switch .
【０００９】第２の発明の光ファイバ給電線装置は、無
線ローカルエリアネットワーク（無線ＬＡＮ）端末に対
して無線信号を送受信する複数のアンテナと、該無線信
号とベースバンド信号とを変換する変復調器と、該アン
テナと変復調器の間を接続する光ファイバ給電線から成
り、該光ファイバ給電線は、無線信号を光信号に変換す
る光送信器と、該光送信器の出力光信号を伝送する光フ
ァイバ伝送路と、該光ファイバ伝送路の出力を無線信号
に変換する光受信器によって構成される無線ＬＡＮにお
いて、前記光ファイバ伝送路としてコア径１００μｍ以
上の多モード光ファイバを用いる無線ＬＡＮにおける光
ファイバ給電線装置であって、前記アンテナから光送信
器への入力無線信号と光受信器からアンテナへの出力無
線信号とを切り替える電気的なスイッチを有し、また前
記変調器から光送信器への入力無線信号と光受信器から
復調器への出力無線信号とを切り替える電気的なスイッ
チを有することを特徴とする。An optical fiber feeder according to a second aspect of the present invention includes a plurality of antennas for transmitting / receiving a radio signal to / from a wireless local area network (wireless LAN) terminal, and a modem for converting the radio signal and a baseband signal. And an optical fiber feed line connecting between the antenna and the modem, the optical fiber feed line transmitting an optical transmitter for converting a radio signal to an optical signal, and transmitting an output optical signal of the optical transmitter. In a wireless LAN configured by an optical fiber transmission line and an optical receiver that converts an output of the optical fiber transmission line into a wireless signal, a wireless LAN using a multimode optical fiber having a core diameter of 100 μm or more as the optical fiber transmission line . light
A fiber feed line device, wherein light is transmitted from the antenna.
No radio signal input to the receiver and no output from the optical receiver to the antenna
It has an electrical switch to switch between the line signal and
The input radio signal from the modulator to the optical transmitter and from the optical receiver
An electrical switch for switching between the output radio signal to the demodulator
Characterized by having
【００１０】第３の発明の無線基地局は、移動端末に対
して無線信号を送受信するアンテナと、該無線信号と通
話信号とを変換する変復調器と、該アンテナと変復調器
の間を接続する光ファイバ給電線から成り、該光ファイ
バ給電線は、無線信号を光信号に変換する光送信器と、
該光送信器の出力光信号を伝送する光ファイバ伝送路
と、該光ファイバ伝送路の出力を無線信号に変換する光
受信器によって構成される無線基地局において、前記光
ファイバ伝送路としてコア径１００μｍ以上の多モード
光ファイバを用い、前記変復調器と電気的な分波器とを
接続し、該分波器によって分岐した無線信号を直接また
は前記光ファイバ給電線装置を介して複数のアンテナに
集配することを特徴とする。A wireless base station according to a third aspect of the present invention provides
An antenna for transmitting and receiving radio signals, and
A modem for converting a speech signal, the antenna and the modem
And an optical fiber feed line connecting the
An optical transmitter that converts a wireless signal into an optical signal;
Optical fiber transmission line for transmitting an output optical signal of the optical transmitter
And light for converting the output of the optical fiber transmission line into a radio signal.
In a wireless base station constituted by a receiver,
Multimode with a core diameter of 100μm or more as a fiber transmission line
Using an optical fiber, the modem and the electrical duplexer
And directly and wirelessly split the radio signal split by the duplexer.
Is connected to a plurality of antennas via the optical fiber feeder.
It is characterized by collecting and delivering.
【００１１】第４の発明の無線ＬＡＮは、無線ローカル
エリアネットワーク（無線ＬＡＮ）端末に対して無線信
号を送受信する複数のアンテナと、該無線信号とベース
バンド信号とを変換する変復調器と、該アンテナと変復
調器の間を接続する光ファイバ給電線から成り、該光フ
ァイバ給電線は、無線信号を光信号に変換する光送信器
と、該光送信器の出力光信号を伝送する光ファイバ伝送
路と、該光ファイバ伝送路の出力を無線信号に変換する
光受信器によって構成される無線ＬＡＮにおいて、前記
光ファイバ伝送路としてコア径１００μｍ以上の多モー
ド光ファイバを用い、前記変復調器と電気的な分波器と
を接続し、該分波器によって分岐した無線信号を直接ま
たは前記光ファイバ給電線装置を介して複数のアンテナ
に集配することを特徴とする。A wireless LAN according to a fourth aspect of the present invention is a wireless local area network.
Wireless communication to area network (wireless LAN) terminals
Antennas for transmitting and receiving signals, the radio signal and the base
A modem for converting a band signal,
And an optical fiber feed line connecting between the controllers.
The fiber feeder is an optical transmitter that converts wireless signals into optical signals.
And an optical fiber transmission for transmitting an output optical signal of the optical transmitter.
And converting the output of the optical fiber transmission line into a wireless signal
In a wireless LAN configured by an optical receiver,
Multimode with a core diameter of 100 μm or more as an optical fiber transmission line
Using optical fiber, said modem and electrical demultiplexer
And directly connect the wireless signal split by the duplexer.
Or a plurality of antennas via the optical fiber feed line device.
It is characterized by being collected and delivered to
【００１２】（作用）第１および第２の発明の光ファイ
バ給電線装置において、光ファイバ伝送路のファイバコ
ア径を１００μｍ以上と大きくすることにより、コア径
が１０μｍ以下の単一モードファイバやコア径が５０μ
ｍ程度の多モードファイバを使用した場合に比べて、光
ファイバ同士の融着および光部品との接続の精度に関す
る制約が緩和されるため、より容易な光ファイバの接続
を実現できる。 (Operation ) The optical fiber of the first and second inventions
The fiber feeder of the optical fiber transmission line
The core diameter can be increased by increasing the diameter to 100 μm or more.
Is 10μm or less single mode fiber or 50μ core diameter
m compared to using multimode fiber of about m
Regarding the accuracy of fusion between fibers and connection with optical components
Optical fiber connection easier
Can be realized.
【００１３】また、光ファイバ伝送路の光源としてレー
ザダイオードを使用した場合、レーザダイオードの相対
強度雑音特性が戻り光の影響によって悪化することはよ
く知られている。ここで多モード光ファイバのコア径が
レーザダイオードの発光面に比して十分大きい場合、光
ファイバ伝送路の途中に反射点が存在しても、レーザダ
イオード内部に戻る光量は小さくなるため、相対強度雑
音の劣化を軽減することができる。 [0013] In addition, a laser is used as a light source for an optical fiber transmission line.
When using a diode, the relative
Intensity noise characteristics are not likely to be degraded by the effects of returning light.
Well known. Where the core diameter of the multimode optical fiber is
If it is large enough compared to the light emitting surface of the laser diode,
Even if there is a reflection point in the middle of the fiber transmission line, the laser
Since the amount of light returning to the inside of the iode is small, the relative intensity
Sound deterioration can be reduced.
【００１４】なお一般的に多モード光ファイバを用いて
無線信号を光伝送する場合、ファイバ端面や接続部にお
いて各モードの信号光間で干渉パターンが生じ、モード
雑音が発生する。 In general, using a multimode optical fiber
When transmitting wireless signals optically, the fiber end face or connection
Interference patterns between the signal lights in each mode
Noise occurs.
【００１５】しかし、多モード光ファイバのモード数が
ファイバコア径の２乗に比例して増加するため、ファイ
バコア径を大きくすることにより、ファイバ端面や接続
部における光強度分布は平均化され、コード雑音の影響
は低減される。 However, the number of modes of the multimode optical fiber is
Since it increases in proportion to the square of the fiber core diameter,
Increasing the diameter of the fiber core and the connection
The light intensity distribution in the section is averaged, and the effect of code noise
Is reduced.
【００１６】この多モード光ファイバのモード数とモー
ド雑音の関係については、例えばコーネン（Ａ．Ｍ．
Ｊ．ＫＯＯＮＥＮ）による、アイ・イー・イー・イージ
ャーナルオンセレクテドエリアズインコミュニケーショ
ン（ＩＥＥＥ Ｊｏｕｒｎａｌｏｆ Ｓｅｌｅｃｔｅｄ
Ａｒｅａｓ ｉｎ Ｃｏｍｍｕｎｉｃａｔｉｏｎ）第
４巻９号１５１５頁、式（２）に述べられている。本発
明ではファイバコア径を１００μｍ以上と大きくするこ
とにより、モード雑音を無視できる程度まで抑圧してい
る。 The number of modes and modes of this multimode optical fiber
As for the relationship between the noises, for example, Koenen (A.M.
J. KOENEN)
Journal on Selected Areas Communication
(IEEE Journal of Selected)
Areas in Communication)
It is described in equation (2), Vol. 4, No. 9, page 1515. Departure
In the light, the fiber core diameter should be as large as 100 μm or more.
And the mode noise is suppressed to a negligible level.
You.
【００１７】また、第１および第２の発明の光ファイバ
給電線装置では、アンテナから光送信器、および光受信
器からアンテナへの無線信号の流れは電気的なスイッチ
によって切り替えられる。また、変調器から光送信器、
および光受信器から復調器への無線信号の流れもまた電
気的なスイッチによって切り替えられる。 Also, the optical fiber of the first and second inventions
In the feeder device, the optical transmitter and the optical receiver
The flow of radio signals from the device to the antenna is an electrical switch
Is switched by Also, from the modulator to the optical transmitter,
And the flow of radio signals from the optical receiver to the demodulator is also
It can be switched by a smart switch.
【００１８】この様な構成にすることにより、アンテナ
と光ファイバ給電線装置、および変復調器と光ファイバ
給電線装置の無線信号の入出力系統を単一化し、装置構
成を簡略化することができる。 With such a configuration, the antenna
And optical fiber feeder, and modem and optical fiber
By unifying the input / output system of the wireless signal of the feeder device,
Configuration can be simplified.
【００１９】第３の発明の無線基地局および第４の発明
の無線ＬＡＮでは、光ファイバ給電線装置と変復調器と
が電気的な分波器を介して接続される。 A wireless base station according to a third invention and a fourth invention
In a wireless LAN, an optical fiber feeder and a modem
Are connected via an electrical duplexer.
【００２０】この様な構成にすることにより、光ファイ
バ給電線装置伝送路を用いない従来の無線基地局や無線
ＬＡＮ端末に対し、変復調器を増設することなしに、光
ファイバ給電線装置を介してアンテナを接続することが
可能になる。 With such a configuration, the optical fiber
Conventional wireless base stations and wireless systems that do not use
For LAN terminals, without adding a modem,
Connecting an antenna via a fiber feeder
Will be possible.
【００２１】[0021]
【発明の実施の形態】次に本発明について図面を参照し
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【００２２】図１に本発明の第１の実施例の無線基地局
の構成を示す。図１で、無線基地局５はリモートアンテ
ナ装置４ａおよび４ｂと、それぞれ多モード光ファイバ
１ａ、２ａおよび１ｂ、２ｂを介して接続されている。
ここで、移動端末３は、無線基地局５のアンテナ７２と
直接無線信号を送受信不可能であるが、リモートアンテ
ナ装置４ａのアンテナ７１ａとは直接交信できる位置に
あるものとする。FIG. 1 shows the configuration of a radio base station according to a first embodiment of the present invention. In FIG. 1, a radio base station 5 is connected to remote antenna devices 4a and 4b via multimode optical fibers 1a, 2a and 1b, 2b, respectively.
Here, it is assumed that the mobile terminal 3 cannot transmit / receive a radio signal directly to / from the antenna 72 of the radio base station 5 but is located at a position where it can directly communicate with the antenna 71a of the remote antenna device 4a.
【００２３】移動端末３から送信された無線信号１００
は、リモートアンテナ装置４ａのアンテナ７１ａで受信
され、帯域通過フィルタ２０ａによって不要な周波数成
分を除去された後、サーキュレータ２１ａを介して、光
送信器１１ａに入力される。光送信器１１ａは電気／光
変換器、増幅器等からなり、入力無線信号１０４ａを光
信号２０２ａに変換する。変換された光信号２０２ａ
は、多モード光ファイバ伝送路２ａを通り、無線基地局
５の光受信器１３ａによって受信される。ここで、多モ
ード光ファイバ伝送路としてファイバコア径が１００μ
m 以上のものを用いることにより、作用の項で説明した
ように、光ファイバ同士や光部品との接続を容易にし、
多モード光ファイバ伝送路から電気／光変換器への戻り
光による雑音の影響を軽減し、さらに多モード光ファイ
バ伝送路中で生じるモード雑音の影響を低減できる。光
受信器１３ａは光／電気変換器、増幅器等からなり、入
力光信号２０２ａを無線信号１０６ａに変換する。無線
信号１０６ａはサーキュレータ２２ａを介して分波器３
０に入力され、アンテナ７２、リモートアンテナ４ｂか
らの無線信号と足しあわされる。分波器の分岐数は任意
であり、分岐数を増やすほど多数のアンテナを接続可能
になる。分波器の出力無線信号１０９は変復調器４０に
入力され、通話信号３００に復調される。復調された通
話信号３００は、複数の無線基地局を統括する中央局へ
と伝送される。ここでは移動端末から無線基地局への信
号（上り回線）について説明したが、無線基地局から移
動端末への信号（下り回線）についても同様である。Wireless signal 100 transmitted from mobile terminal 3
Is received by the antenna 71a of the remote antenna device 4a, and after unnecessary frequency components are removed by the band-pass filter 20a, the signal is input to the optical transmitter 11a via the circulator 21a. The optical transmitter 11a includes an electric / optical converter, an amplifier, etc., and converts the input wireless signal 104a into an optical signal 202a. Converted optical signal 202a
Is received by the optical receiver 13a of the wireless base station 5 through the multimode optical fiber transmission line 2a. Here, the fiber core diameter is 100 μm as a multimode optical fiber transmission line.
As described in the section of the operation, the use of a fiber having a length of at least m facilitates connection between optical fibers and optical components,
The effect of noise due to return light from the multi-mode optical fiber transmission line to the electric / optical converter can be reduced, and the effect of mode noise generated in the multi-mode optical fiber transmission line can be reduced. The optical receiver 13a includes an optical / electrical converter, an amplifier, etc., and converts an input optical signal 202a into a wireless signal 106a. The radio signal 106a is transmitted to the duplexer 3 via the circulator 22a.
0 and is added to the radio signals from the antenna 72 and the remote antenna 4b. The number of branches of the duplexer is arbitrary, and as the number of branches increases, more antennas can be connected. The output radio signal 109 of the duplexer is input to the modulator / demodulator 40 and is demodulated into a speech signal 300. Demodulated speech signal 300 is transmitted to a central office that controls a plurality of wireless base stations. Here, the signal from the mobile terminal to the wireless base station (uplink) has been described, but the same applies to the signal from the wireless base station to the mobile terminal (downlink).
【００２４】なお前項では無線基地局５のアンテナ７２
で送受信される無線信号と、リモートアンテナ４ａ、４
ｂのアンテナ７１ａ、７１ｂで送受信される無線信号は
それぞれ互いに干渉しないものとして記述したが、現実
には複数のアンテナにおいて同時に無線信号を送受信可
能な場合が存在する。この場合は、移動端末３から送信
された無線信号（上り回線）は、アンテナ７１ａ、７１
ｂ、および７２で受信され、無線基地局の復調器４０に
おいて受信レベルおよび受信遅延差の異なるマルチパス
信号として認識されて、トランスバーサルフィルタまた
はディジタル信号処理によって等化処理される。また、
無線基地局からアンテナ７１ａ、７１ｂ、および７２を
介して送信された無線信号（下り回線）についても、移
動端末３の復調器においてマルチパス信号として認識さ
れ、等化処理される。In the preceding paragraph, the antenna 72 of the radio base station 5
Wireless signals transmitted and received by the remote antennas 4a and 4
The wireless signals transmitted and received by the b antennas 71a and 71b are described as not interfering with each other, but in reality there are cases where wireless signals can be transmitted and received simultaneously by a plurality of antennas. In this case, the radio signal (uplink) transmitted from mobile terminal 3 is transmitted through antennas 71a, 71
b, and 72, are recognized as multipath signals having different reception levels and reception delay differences by the demodulator 40 of the radio base station, and are equalized by a transversal filter or digital signal processing. Also,
A radio signal (downlink) transmitted from the radio base station via the antennas 71a, 71b, and 72 is also recognized as a multipath signal by the demodulator of the mobile terminal 3 and subjected to equalization processing.
【００２５】図２に、無線ＬＡＮを部屋間で接続する従
来の構成を示す。無線ＬＡＮは主に屋内で使用され、一
つのアンテナがカバーできる範囲は基本的に一つの部屋
に限定される。そのため、複数の部屋にサービスエリア
を拡張するためには、部屋間を有線ケーブルを用いて接
続する。図２において無線エリアＸと無線エリアＹとは
壁などによって仕切られており、相互に無線信号を直接
通信できないものとする。無線ＬＡＮ端末７は無線エリ
アＸに、無線ＬＡＮ端末６は無線エリアＹに配置され、
両者は有線ＬＡＮケーブル９によって接続されている。
無線エリアＸにある無線ＬＡＮ端末８が発する無線信号
１００は、アンテナ７５で受信され、ベースバンド信号
３０２に復調される。復調されたベースバンド信号３０
２は有線ＬＡＮ／無線ＬＡＮブリッジ６１に入力され
る。有線ＬＡＮ／無線ＬＡＮブリッジ６１はトランスポ
ート層でベースバンド信号３０２を有線ＬＡＮに接続
し、ベースバンド信号３０３を有線ＬＡＮケーブル９に
送出する。ベースバンド信号３０３は、有線ＬＡＮ／無
線ＬＡＮブリッジ６０においてベースバンド信号３０１
に変換され、無線ＬＡＮ端末６に入力される。無線ＬＡ
Ｎ端末６はベースバンド信号３０１を再度無線信号に変
調し、アンテナ７４から無線エリアＹに向けて送信す
る。また、無線エリアＹのアンテナ７４において受信さ
れた無線信号も、同様に無線エリアＸに向けて送信され
る。この様に従来の無線ＬＡＮでは、部屋間接続に有線
ＬＡＮを用いる構成であるため、部屋毎に無線の変復調
器および有線ＬＡＮ／無線ＬＡＮの接続ブリッジが必要
となる。FIG. 2 shows a conventional configuration for connecting a wireless LAN between rooms. The wireless LAN is mainly used indoors, and the range that one antenna can cover is basically limited to one room. Therefore, in order to extend the service area to a plurality of rooms, the rooms are connected using a wired cable. In FIG. 2, the wireless area X and the wireless area Y are separated by a wall or the like, and it is assumed that wireless signals cannot be directly communicated with each other. The wireless LAN terminal 7 is located in the wireless area X, the wireless LAN terminal 6 is located in the wireless area Y,
Both are connected by a wired LAN cable 9.
The wireless signal 100 emitted by the wireless LAN terminal 8 in the wireless area X is received by the antenna 75 and demodulated into a baseband signal 302. Demodulated baseband signal 30
2 is input to the wired LAN / wireless LAN bridge 61. The wired LAN / wireless LAN bridge 61 connects the baseband signal 302 to the wired LAN at the transport layer, and sends the baseband signal 303 to the wired LAN cable 9. The baseband signal 303 is transmitted from the wired LAN / wireless LAN bridge 60 to the baseband signal 301.
And input to the wireless LAN terminal 6. Wireless LA
The N terminal 6 modulates the baseband signal 301 again into a radio signal and transmits the radio signal from the antenna 74 to the radio area Y. The wireless signal received by the antenna 74 in the wireless area Y is also transmitted toward the wireless area X. As described above, in the conventional wireless LAN, since a wired LAN is used for connection between rooms, a wireless modem and a wired LAN / wireless LAN connection bridge are required for each room.
【００２６】図３に、本発明の第２の実施例である無線
ＬＡＮの構成を示す。図３においても図２と同様に無線
エリアＸと無線エリアＹとは壁などによって仕切られて
おり直接無線信号を相互に通信できないものとする。無
線ＬＡＮ端末６とリモートアンテナ４ａはそれぞれ無線
エリアＸ、Ｙに配置され、両者は多モード光ファイバ伝
送路１ａ、２ａで接続される。リモートアンテナ装置４
ａおよび無線ＬＡＮ端末６の光送信器、光受信器および
変復調器などの機能については、実施例１の無線基地局
と同様である。有線ＬＡＮを用いて無線ＬＡＮを接続す
る従来の方法と比較して、本発明の光ファイバを用いて
リモートアンテナ４ａを増設する方法では、無線信号を
そのまま光信号の強度変調におきかえ、サブキャリア多
重して伝送するため、無線信号の変復調器や有線ＬＡＮ
との接続ブリッジ等は不要である。本構成では、無線エ
リアＸおよびＹで同一無線チャンネルを共有するため、
特に無線エリアＹを占める無線ＬＡＮ端末の台数が比較
的低く、高コストの有線ＬＡＮとの接続機器の設置の必
要性が低い場合に特に有効と考えられる。FIG. 3 shows the configuration of a wireless LAN according to a second embodiment of the present invention. In FIG. 3, as in FIG. 2, the wireless area X and the wireless area Y are separated by a wall or the like, and wireless signals cannot be directly communicated with each other. The wireless LAN terminal 6 and the remote antenna 4a are arranged in wireless areas X and Y, respectively, and both are connected by multimode optical fiber transmission lines 1a and 2a. Remote antenna device 4
a and the functions of the wireless LAN terminal 6 such as an optical transmitter, an optical receiver, and a modem are the same as those of the wireless base station of the first embodiment. Compared with the conventional method of connecting a wireless LAN using a wired LAN, in the method of adding the remote antenna 4a using the optical fiber of the present invention, the radio signal is directly replaced with the intensity modulation of the optical signal, and subcarrier multiplexing is performed. To transmit and receive, wireless signal modem and wired LAN
No connection bridge or the like is required. In this configuration, since the same wireless channel is shared by the wireless areas X and Y,
In particular, it is considered to be particularly effective when the number of wireless LAN terminals occupying the wireless area Y is relatively low and the necessity of installing a high-cost wired LAN connection device is low.
【００２７】図４に、本発明の第３の実施例である無線
ＬＡＮの構成を示す。無線ＬＡＮのような無線システム
の場合、端末の送信と受信は時間的に切り替えられる。
そこで、無線ＬＡＮ端末６の分波器３１にスイッチ２７
を接続し、分波器３１の入出力無線信号１０７ａを、光
送信器１０ａへの入力無線信号１０５ａと光受信器１３
ａからの出力無線信号１０６ａとに切り替える。スイッ
チ２７の制御信号は、変復調器４１からスイッチ制御信
号４００を取り出して用いる。実際に無線ＬＡＮ端末で
は消費電力の低減のため、無線信号送出時、受信時、お
よび待機時で電子回路の動作モードを変化させるための
制御信号を有しているので、これを使用する。また、ス
イッチ制御信号４００は振幅変調器８１によって無線信
号よりも十分低い周波数の制御信号４０１に変調され、
合波器３３によって無線信号にサブキャリア多重され
る。リモートアンテナ４ａでは、受信無線信号１０３ａ
の一部を分波器３２によって取り出し、低周波通過フィ
ルタ２３によって制御信号を取り出した後、振幅復調器
８０によってスイッチ制御信号４０３を取り出す。この
様な構成にすることにより、無線信号の光送信器入力と
光受信器出力を、サーキュレータを用いずにアンテナ端
子に接続することが可能になる。また、光送受信器に送
受信切り替えの信号を利用して、未使用時には増幅器を
低電力動作モードに切り替えることにより、装置の低消
費電力化を図ることができる。FIG. 4 shows the configuration of a wireless LAN according to a third embodiment of the present invention. In the case of a wireless system such as a wireless LAN, transmission and reception of a terminal are temporally switched.
Therefore, the switch 27 is connected to the duplexer 31 of the wireless LAN terminal 6.
And the input / output wireless signal 107a of the duplexer 31 is connected to the input wireless signal 105a to the optical transmitter 10a and the optical receiver 13
The output wireless signal 106a is switched to the output wireless signal 106a. As a control signal of the switch 27, a switch control signal 400 is extracted from the modem 41 and used. Actually, in order to reduce power consumption, a wireless LAN terminal has a control signal for changing the operation mode of the electronic circuit at the time of sending, receiving, and waiting for a wireless signal. Further, the switch control signal 400 is modulated by the amplitude modulator 81 into a control signal 401 having a frequency sufficiently lower than the radio signal,
Subcarrier multiplexing is performed on the radio signal by the multiplexer 33. In the remote antenna 4a, the received radio signal 103a
Is extracted by the demultiplexer 32 and the control signal is extracted by the low frequency pass filter 23, and then the switch control signal 403 is extracted by the amplitude demodulator 80. With such a configuration, it is possible to connect the optical transmitter input and the optical receiver output of the radio signal to the antenna terminal without using a circulator. In addition, by using the transmission / reception switching signal for the optical transceiver and switching the amplifier to the low power operation mode when not in use, the power consumption of the device can be reduced.
【００２８】図５に、本発明の参考例である無線基地局
の構成を示す。無線基地局５およびリモートアンテナ装
置４ａ、４ｂの機能は実施例１と同じである。無線基地
局５からの出力光信号２０１ａは光カプラ２４によって
光信号２０１ｃ、２０１ｄに分岐され、それぞれリモー
トアンテナ装置４ａ、４ｂの光受信器に入力される。ま
た、リモートアンテナ装置４ａ、４ｂの出力光信号２０
２ｃ、２０２ｄは、光カプラ２５によって合波され、無
線基地局の光受信器に入力される。この様な構成にする
ことによって、リモートアンテナ装置４ａ、４ｂに対す
る無線基地局側の光送受信器を共有化でき、装置構成を
単純化することが可能になる。但し、本構成の場合、リ
モートアンテナ装置４ａの光送信器１１ａの光源と、リ
モートアンテナ装置４ｂの光送信器１１ｂの光源とは、
光受信器１３ａにおいてビート雑音を発生しないように
波長を離す必要がある。FIG. 5 shows a configuration of a radio base station according to a reference example of the present invention. The functions of the wireless base station 5 and the remote antenna devices 4a and 4b are the same as in the first embodiment. The output optical signal 201a from the wireless base station 5 is split into optical signals 201c and 201d by the optical coupler 24 and input to the optical receivers of the remote antenna devices 4a and 4b, respectively. Also, the output optical signals 20 of the remote antenna devices 4a, 4b
2c and 202d are multiplexed by the optical coupler 25 and input to the optical receiver of the radio base station. With this configuration, the optical transceiver on the wireless base station side can be shared with the remote antenna devices 4a and 4b, and the device configuration can be simplified. However, in the case of this configuration, the light source of the optical transmitter 11a of the remote antenna device 4a and the light source of the optical transmitter 11b of the remote antenna device 4b are:
It is necessary to separate wavelengths so that beat noise is not generated in the optical receiver 13a.
【００２９】図６に、本発明の第４の実施例である無線
基地局の構成を示す。無線基地局５とリモートアンテナ
装置４ａとは多モード光ファイバ１ａおよび２ａにより
接続され、リモートアンテナ装置４ａと４ｂとは多モー
ド光ファイバ１ｂおよび２ｂにより接続される。光信号
はリモートアンテナ装置４ａにおいて非再生中継され
る。すなわち、リモートアンテナ装置４ｂから多モード
光ファイバ２ｂを通して伝送される光信号２０２ｂは、
リモートアンテナ装置４ａの光受信器１５で一度無線信
号に変換され、アンテナ７１ａにおいて受信された無線
信号１１３と分波器３５を介して合波され、光送信器１
１ａにより再度光信号２０２ａに変換されて、多モード
光ファイバ伝送路２ａを通り無線基地局５の光受信器で
受信される。また、無線基地局からの送信光信号２０１
ａは、リモートアンテナ装置４ａの光受信器１２ａによ
って電気信号に変換された後、分波器３４によって分岐
される。分岐された無線信号１１０は、増幅器９０によ
って適切な強度に増幅された後、サーキュレータ１２ａ
および帯域通過フィルタ２０ａを経てアンテナ７１ａか
ら送信される。また、分波器３４によって分岐されたも
う一方の無線信号１１１は、光送信器１４に入力され、
光信号２０１ｂに変換される。変換された光信号２０１
ｂは、多モード光ファイバ伝送路１ｂを通ってリモート
アンテナ装置４ｂに伝送され、光受信器１２ｂによって
無線信号１０３ｂに変換される。変換された無線信号１
０３ｂは、サーキュレータ２１ｂおよび帯域通過フィル
タ２０ｂを経て、アンテナ７１ｂから送信される。この
様な構成にすることにより、光ファイバ伝送路を通る光
源の波長が単一となる。従って、光ファイバ伝送路上で
光信号を多重する方式で問題であったビート雑音の問題
を回避することができ、光源の波長管理が不要となる。FIG. 6 shows the configuration of a radio base station according to a fourth embodiment of the present invention. The wireless base station 5 and the remote antenna device 4a are connected by multimode optical fibers 1a and 2a, and the remote antenna devices 4a and 4b are connected by multimode optical fibers 1b and 2b. The optical signal is non-regeneratively relayed in the remote antenna device 4a. That is, the optical signal 202b transmitted from the remote antenna device 4b through the multimode optical fiber 2b is
The optical signal is once converted into a radio signal by the optical receiver 15 of the remote antenna device 4a, multiplexed with the radio signal 113 received by the antenna 71a via the demultiplexer 35, and
The signal is again converted into an optical signal 202a by 1a, and is received by the optical receiver of the wireless base station 5 through the multimode optical fiber transmission line 2a. Also, the transmission optical signal 201 from the radio base station
a is converted into an electric signal by the optical receiver 12a of the remote antenna device 4a, and then branched by the splitter 34. The branched radio signal 110 is amplified to an appropriate intensity by the amplifier 90, and then the circulator 12a
And transmitted from the antenna 71a via the band-pass filter 20a. The other radio signal 111 branched by the demultiplexer 34 is input to the optical transmitter 14,
It is converted into an optical signal 201b. Converted optical signal 201
b is transmitted to the remote antenna device 4b through the multimode optical fiber transmission line 1b, and is converted into a radio signal 103b by the optical receiver 12b. Converted wireless signal 1
03b is transmitted from the antenna 71b via the circulator 21b and the band-pass filter 20b. With such a configuration, the wavelength of the light source passing through the optical fiber transmission line becomes a single wavelength. Therefore, the problem of beat noise, which has been a problem in the system of multiplexing optical signals on the optical fiber transmission line, can be avoided, and the wavelength management of the light source becomes unnecessary.
【００３０】[0030]
【発明の効果】以上述べたように本発明によれば、移動
電話や無線ＬＡＮなどの無線通信システムにおいて、低
雑音で接続の容易な光伝送路を用いてアンテナ不感地帯
に無線信号を供給することが実現できる。As described above, according to the present invention, in a radio communication system such as a mobile telephone or a wireless LAN, a radio signal is supplied to an antenna blind zone using an optical transmission line with low noise and easy connection. Can be realized.
【図１】本発明の第１の実施例の無線基地局の構成であ
る。FIG. 1 shows the configuration of a wireless base station according to a first embodiment of the present invention.
【図２】従来の無線ＬＡＮを部屋間で接続する構成であ
る。FIG. 2 shows a configuration in which a conventional wireless LAN is connected between rooms.
【図３】本発明の第２の実施例の無線ＬＡＮの構成であ
る。FIG. 3 shows a configuration of a wireless LAN according to a second embodiment of the present invention.
【図４】本発明の第３の実施例の無線ＬＡＮの構成であ
る。FIG. 4 shows a configuration of a wireless LAN according to a third embodiment of the present invention.
【図５】本発明の参考例の無線基地局の構成である。FIG. 5 is a configuration of a wireless base station according to a reference example of the present invention.
【図６】本発明の第４の実施例の無線基地局の構成であ
る。FIG. 6 is a configuration of a wireless base station according to a fourth embodiment of the present invention.
１ａ〜１ｄ、２ａ〜２ｄ 多モード光ファイバ伝送路 ３ 移動端末 ４ａ、４ｂ リモートアンテナ装置 ５ 無線基地局 ６、７、８ 無線ＬＡＮ端末 ９ 有線ＬＡＮケーブル １０ａ、１０ｂ、１１ａ、１１ｂ、１４ 光送信器 １２ａ、１２ｂ、１３ａ、１３ｂ、１５ 光受信器 ２０ａ、２０ｂ、２３ フィルタ ２１ａ、２１ｂ、２２ａ、２２ｂ サーキュレータ ２４、２５ 光カプラ ２６、２７ スイッチ ３０〜３５ 分波器 ４０、４１ 変復調器 ６０、６１ 無線ＬＡＮ／有線ＬＡＮブリッジ ７０、７１ａ、７１ｂ、７２、７３ アンテナ ８０ 振幅復調器 ８１ 振幅変調器 １００、１０１ａ、１０１ｂ、１０２ａ、１０２ｂ、１
０３ａ〜１０３ｃ、１０４ａ、１０４ｂ、１０５ａ、１
０５ｂ、１０６ａ、１０６ｂ、１０７ａ、１０７ｂ、１
０８〜１１２ 無線信号 ２０１ａ〜２０１ｄ、２０２ａ〜２０２ｄ 光信号 ３００ 通信信号 ３０１〜３０３ ベースバンド信号 ４００〜４０３ スイッチ制御信号 Ｘ、Ｙ 無線エリア1a to 1d, 2a to 2d Multimode optical fiber transmission line 3 Mobile terminal 4a, 4b Remote antenna device 5 Wireless base station 6, 7, 8 Wireless LAN terminal 9 Wired LAN cable 10a, 10b, 11a, 11b, 14 Optical transmitter 12a, 12b, 13a, 13b, 15 Optical receiver 20a, 20b, 23 Filter 21a, 21b, 22a, 22b Circulator 24, 25 Optical coupler 26, 27 Switch 30-35 Demultiplexer 40, 41 Modulator / demodulator 60, 61 Radio LAN / wired LAN bridge 70, 71a, 71b, 72, 73 Antenna 80 Amplitude demodulator 81 Amplitude modulator 100, 101a, 101b, 102a, 102b, 1
03a to 103c, 104a, 104b, 105a, 1
05b, 106a, 106b, 107a, 107b, 1
08-112 Wireless signal 201a-201d, 202a-202d Optical signal 300 Communication signal 301-303 Baseband signal 400-403 Switch control signal X, Y Wireless area
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−268622（ＪＰ，Ａ) 特開 平５−122135（ＪＰ，Ａ) 特開 平２−9240（ＪＰ，Ａ) 特開 平４−48832（ＪＰ，Ａ) 特開 平５−276113（ＪＰ，Ａ) 伊賀健一、国分泰雄著、「新ＯＨＭ文 庫光ファイバ」第１版、オーム社、昭和 61年２月25日、Ｐ83 平山博、福富秀雄、加藤嘉則、岩橋栄 治、島田潤一編集、「光通信要覧」、初 版、科学新聞社、1984年８月、Ｐ331− 348 (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 10/00 - 10/28 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-268622 (JP, A) JP-A-5-122135 (JP, A) JP-A-2-9240 (JP, A) JP-A-4- 48832 (JP, A) JP-A-5-276113 (JP, A) Kenichi Iga, Yasuo Kokubu, "New OHM Library Optical Fiber," First Edition, Ohmsha, February 25, 1986, P83 Hiroshi Hirayama , Hideo Fukutomi, Yoshinori Kato, Osamu Sakae Iwahashi, Junichi Shimada editing, "optical communication handbook", the first edition, science newspaper, in August 1984, P331- 348 (58) investigated the field (Int.Cl. 6, DB Name) H04B 10/00-10/28
Claims (4)
ンテナと、該無線信号と通話信号とを変換する変復調器
と、該アンテナと変復調器の間を接続する光ファイバ給
電線から成り、該光ファイバ給電線は、無線信号を光信
号に変換する光送信器と、該光送信器の出力光信号を伝
送する光ファイバ伝送路と、該光ファイバ伝送路の出力
を無線信号に変換する光受信器によって構成される無線
基地局において、 前記光ファイバ伝送路としてコア径１００μｍ以上の多
モード光ファイバを用いる無線基地局における光ファイ
バ給電線装置であって、 前記アンテナから光送信器への入力無線信号と光受信器
からアンテナへの出力無線信号とを切り替える電気的な
スイッチを有し、また前記変調器から光送信器への入力
無線信号と光受信器から復調器への出力無線信号とを切
り替える電気的なスイッチを有することを特徴とする光
ファイバ給電線装置。An antenna for transmitting / receiving a radio signal to / from a mobile terminal; a modem for converting the radio signal and a speech signal; and an optical fiber feed line connecting the antenna and the modem. The optical fiber feed line includes an optical transmitter that converts a wireless signal into an optical signal, an optical fiber transmission line that transmits an optical signal output from the optical transmitter, and an optical fiber that converts the output of the optical fiber transmission line into a wireless signal. In a wireless base station constituted by a receiver, an optical fiber in a wireless base station using a multimode optical fiber having a core diameter of 100 μm or more as the optical fiber transmission line.
A feed line device, comprising an electrical switch for switching between an input wireless signal from the antenna to the optical transmitter and an output wireless signal from the optical receiver to the antenna, and from the modulator to the optical transmitter. An optical switch for switching between an input wireless signal and an output wireless signal from an optical receiver to a demodulator.
ＡＮ）端末に対して無線信号を送受信する複数のアンテ
ナと、該無線信号とベースバンド信号とを変換する変復
調器と、該アンテナと変復調器の間を接続する光ファイ
バ給電線から成り、該光ファイバ給電線は、無線信号を
光信号に変換する光送信器と、該光送信器の出力光信号
を伝送する光ファイバ伝送路と、該光ファイバ伝送路の
出力を無線信号に変換する光受信器によって構成される
無線ＬＡＮにおいて、 前記光ファイバ伝送路としてコア径１００μｍ以上の多
モード光ファイバを用いる無線ＬＡＮにおける光ファイ
バ給電線装置であって、 前記アンテナから光送信器への入力無線信号と光受信器
からアンテナへの出力無線信号とを切り替える電気的な
スイッチを有し、また前記変調器から光送信器への入力
無線信号と光受信器から復調器への出力無線信号とを切
り替える電気的なスイッチを有することを特徴とする光
ファイバ給電線装置。 2. A wireless local area network (wireless L
AN) a plurality of antennas for transmitting / receiving a radio signal to / from a terminal, a modem for converting the radio signal and a baseband signal, and an optical fiber feed line connecting between the antenna and the modem; The fiber feeder includes an optical transmitter that converts a wireless signal into an optical signal, an optical fiber transmission line that transmits an output optical signal from the optical transmitter, and an optical receiver that converts the output of the optical fiber transmission line into a wireless signal. An optical fiber in a wireless LAN using a multimode optical fiber having a core diameter of 100 μm or more as the optical fiber transmission line.
A bar feeder line device, the input radio signal and the optical receiver from the antenna to the optical transmitter
Switch between the output radio signal from the
A switch, and an input from the modulator to an optical transmitter.
Disconnects the wireless signal and the output wireless signal from the optical receiver to the demodulator.
Light having an electrical switch for switching
Fiber feed line device.
ンテナと、該無線信号と通話信号とを変換する変復調器
と、該アンテナと変復調器の間を接続する光ファイバ給
電線 から成り、該光ファイバ給電線は、無線信号を光信
号に変換する光送信器と、該光送信器の出力光信号を伝
送する光ファイバ伝送路と、該光ファイバ伝送路の出力
を無線信号に変換する光受信器によって構成される無線
基地局において、 前記光ファイバ伝送路としてコア径１００μｍ以上の多
モード光ファイバを用い、 前記変復調器と電気的な分波器とを接続し、該分波器に
よって分岐した無線信号を、直接または前記光ファイバ
給電線装置を介して、複数のアンテナに集配することを
特徴とする無線基地局。 3. An apparatus for transmitting / receiving a radio signal to / from a mobile terminal.
Antenna and a modem for converting the radio signal and the call signal
And an optical fiber feeder for connecting between the antenna and the modem.
And an optical fiber feeder for transmitting wireless signals to optical signals.
An optical transmitter for converting the signal into an optical signal, and an optical signal output from the optical transmitter.
Optical fiber transmission line to send and output of the optical fiber transmission line
Wireless configured by an optical receiver that converts a signal into a wireless signal
In the base station, the optical fiber transmission line has a core diameter of 100 μm or more.
Using a mode optical fiber, the modem and the electrical duplexer are connected to each other,
Therefore, the branched radio signal can be directly or
Collecting and distributing to multiple antennas via feeder devices
Characteristic radio base station.
ＡＮ）端末に対して無線信号を送受信する複数のアンテ
ナと、該無線信号とベースバンド信号とを変換する変復
調器と、該アンテナと変復調器の間を接続する光ファイ
バ給電線から成り、該光ファイバ給電線は、無線信号を
光信号に変換する光送信器と、該光送信器の出力光信号
を伝送する光ファイバ伝送路と、該光ファイバ伝送路の
出力を無線信号に変換する光受信器によって構成される
無線ＬＡＮにおいて、 前記光ファイバ伝送路としてコア径１００μｍ以上の多
モード光ファイバを用い、 前記変復調器と電気的な分波器とを接続し、該分波器に
よって分岐した無線信号を、直接または前記光ファイバ
給電線装置を介して、複数のアンテナに集配することを
特徴とする無線ＬＡＮ。 4. A wireless local area network (wireless L
AN) Multiple antennas for transmitting and receiving wireless signals to and from a terminal
And a converter for converting the radio signal and the baseband signal.
And an optical fiber connecting the antenna and the modem.
And the optical fiber feed line transmits radio signals.
Optical transmitter for converting to an optical signal, and output optical signal of the optical transmitter
An optical fiber transmission line for transmitting
Consists of an optical receiver that converts the output to a wireless signal
In a wireless LAN, a multi-core optical fiber transmission line having a core diameter of 100 μm or more is used.
Using a mode optical fiber, the modem and the electrical duplexer are connected to each other,
Therefore, the branched radio signal can be directly or
Collecting and distributing to multiple antennas via feeder devices
Characteristic wireless LAN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7236469A JP2900853B2 (en) | 1995-09-14 | 1995-09-14 | Wireless base station, wireless local area network, and optical fiber feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7236469A JP2900853B2 (en) | 1995-09-14 | 1995-09-14 | Wireless base station, wireless local area network, and optical fiber feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0983450A JPH0983450A (en) | 1997-03-28 |
| JP2900853B2 true JP2900853B2 (en) | 1999-06-02 |
Family
ID=17001210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7236469A Expired - Fee Related JP2900853B2 (en) | 1995-09-14 | 1995-09-14 | Wireless base station, wireless local area network, and optical fiber feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2900853B2 (en) |
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| Publication number | Publication date |
|---|---|
| JPH0983450A (en) | 1997-03-28 |
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