JPH0983450A - Radio base station, radio local area network and optical fiber feeder - Google Patents

Radio base station, radio local area network and optical fiber feeder

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Publication number
JPH0983450A
JPH0983450A JP7236469A JP23646995A JPH0983450A JP H0983450 A JPH0983450 A JP H0983450A JP 7236469 A JP7236469 A JP 7236469A JP 23646995 A JP23646995 A JP 23646995A JP H0983450 A JPH0983450 A JP H0983450A
Authority
JP
Japan
Prior art keywords
optical
optical fiber
signal
radio
wireless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7236469A
Other languages
Japanese (ja)
Other versions
JP2900853B2 (en
Inventor
Yasuhiko Matsunaga
泰彦 松永
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.)
NEC Corp
Original Assignee
NEC Corp
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Filing date
Publication date
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Priority to JP7236469A priority Critical patent/JP2900853B2/en
Publication of JPH0983450A publication Critical patent/JPH0983450A/en
Application granted granted Critical
Publication of JP2900853B2 publication Critical patent/JP2900853B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To supply a radio signal to an antenna dead zone by providing an optical transmission line ease of connection with low noise at a low cost with respect to an antenna feeder in a radio communication system. SOLUTION: A radio signal 100 from a mobile terminal equipment 3 is received by an antenna 71a and converted into an optical signal 202a by an optical transmission section 11a. The optical signal 202a is sent to a radio base station 5 by a multi-mode optical fiber transmission line 2a and converted into a radio signal 106a by an optical receiver 13a. The radio signal 106a uses an optical branching device 30 to add radio signals from antennas 71b, 72 and the sum is given to a MODEM 40. Furthermore, the radio base station 5 branches an output radio signal 109 from the MODEM 40 by the branching device 30 and part of signal is converted into an optical signal 201a by an optical transmitter 10a. The optical signal 201a is sent through a multi-mode optical fiber transmission line 1a and converted into a radio signal 103a by the optical receiver 12a and emitted from an antenna 71a and received by a mobile terminal equipment 3.

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、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 device using a subcarrier multiplex 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 wireless communication system such as a mobile wireless telephone, a service area is divided into a plurality of small areas, and a wireless base station is arranged in each small area. The radio base station
An antenna part, a modulation / demodulation part for converting a radio signal into a call signal,
And a control unit for controlling radio channels, etc., and is connected to a central station for controlling rotation of a larger area with a cable. If the area covered by one wireless base station is reduced, the transmission output of wireless terminals and wireless base stations can be reduced and the frequency usage efficiency can be improved. 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。Further, the frequency of signals used for wireless communication has been increasing year by year due to the increase in transmission signal rate and tight frequency resources. Generally, 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 areas such as urban areas where buildings are densely packed, indoors, and the like, radio wave propagation is disturbed by structures, so that a zone where radio signals are hard to reach (antenna dead zone) occurs. In order to supply a radio signal to the antenna dead zone, a radio base station may be added and the cables may be connected to each other. However, since the radio base station includes a radio signal modulator / demodulator and a control device, 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 and the control section are arranged in the central station, and both are connected by an optical fiber. This method is described in detail, for example, in "Shibuya et al.," Radio signal collection and delivery system for microcell mobile communication by light ", Institute of Electronics, Information and Communication Engineers, Study Group of Radio Communication Systems, RCS90-12 and the like. In this method, the wireless base station only needs to convert the optical signal and the electric signal and amplify the wireless signal, so that downsizing and high reliability of the base station can be realized.

【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。On the other hand, also for the wireless LAN, there has been proposed a small-sized inter-service area transmission device using a broadband optical fiber transmission technique. As an example of applying the optical fiber transmission technology to a wireless LAN system, Thomas (H.
Thomas, et al., 1992 Autumn 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 collecting and delivering system by optical fiber transmission described above, all modulators and demodulators are integrated in a central station, and each antenna and the central station are paired by an optical fiber. It is configured to connect to 1. Therefore, the maximum transmission distance is about 20 km, and transmission by a single mode fiber having a fiber core diameter of 10 μm or less is required. Further, it is necessary to use a distributed feedback laser diode with low noise and low distortion as the 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 radio signals to the above-mentioned antenna dead zone, a radio base station or radio L in a near area is provided.
This can be realized by a configuration in which a radio signal to an antenna of an AN terminal is branched, an antenna is added in an antenna dead zone, and both are connected by an optical fiber. In this case, the required transmission distance is about 500 m at most, so that it is possible to apply a multimode fiber that can be easily connected, a low-cost Fabry-Perot laser diode, or the like.

【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。Therefore, the present invention relates to an antenna feed line in a wireless communication system, and an object thereof is to provide an optical transmission line with low noise and which can be easily connected at low cost, and to supply a wireless signal to an antenna dead zone. .

【０００８】[0008]

【課題を解決するための手段】第１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１００μ
m 以上の多モード光ファイバを用いることを特徴とす
る。According to a first aspect of the present invention, there is provided a radio base station, an antenna for transmitting / receiving a radio signal to / from a mobile terminal, a modulator / demodulator for converting the radio signal and a call signal, and the antenna and the modulator / demodulator. An optical fiber feed line connecting between the optical devices, the optical fiber feed line is an optical transmitter for converting a radio signal into an optical signal, and an optical fiber transmission line for transmitting an optical signal output from the optical transmitter, In a wireless base station including an optical receiver for converting the output of the optical fiber transmission line into a wireless signal, a core diameter of 100 μm is used as the optical fiber transmission line.
It is characterized by using a multimode optical fiber of m or more.

【０００９】第２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ることを特徴とする。A wireless LAN according to a second aspect of the invention comprises a plurality of antennas for transmitting and receiving wireless signals to and from a wireless local area network (wireless LAN) terminal, a modulator / demodulator for converting the wireless signals and baseband signals, and An optical fiber feeder connecting an antenna and a modulator / demodulator, the optical fiber feeder being an optical transmitter for converting a radio signal into an optical signal, and an optical fiber transmission for transmitting an optical signal output from the optical transmitter. In the wireless LAN configured by a line and an optical receiver for converting the output of the optical fiber transmission line into a radio signal, a multimode optical fiber having a core diameter of 100 μm or more is used as the optical fiber transmission line.

【００１０】第３の発明の光ファイバ給電線装置は、第
１の発明の無線基地局または第２の発明の無線ＬＡＮに
おける光ファイバ給電線装置であって、前記光送信器の
光源に、ファブリ・ペローレーザダイオードまたは発光
ダイオードを使用することを特徴とする。An optical fiber feeder circuit device of a third invention is an optical fiber feeder device in the wireless base station of the first invention or the wireless LAN of the second invention, wherein a light source of the optical transmitter is a fabric. -It is characterized by using a Perot laser diode or a light emitting diode.

【００１１】第４の発明の光ファイバ給電線装置は、第
１の発明の無線基地局または第２の発明の無線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 circuit device of a fourth invention is an optical fiber feeder device in the wireless base station of the first invention or the wireless LAN of the second invention, wherein the input from the antenna to the optical transmitter. It has an electric switch for switching between a radio signal and an output radio signal from the optical receiver to the antenna, and an input radio signal from the modulator to the optical transmitter and an output radio signal from the optical receiver to the demodulator. It is characterized by having an electric switch for switching between.

【００１２】第５〜６の発明の無線基地局または無線Ｌ
ＡＮは、それぞれ第１の発明の無線基地局または第２の
発明の無線ＬＡＮであって、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 radio base station or radio L according to the fifth to sixth inventions
The ANs are the wireless base station of the first invention or the wireless LAN of the second invention, respectively, wherein the modulator / demodulator and the electrical demultiplexer are connected to each other, and the wireless signal branched by the demultiplexer is It is characterized in that the light is distributed to a plurality of antennas either directly or via the optical fiber feeder device.

【００１３】第７〜８の発明の無線基地局または無線Ｌ
ＡＮは、それぞれ第１の発明の無線基地局または第２の
発明の無線ＬＡＮであって、前記変復調器とアンテナと
を光ファイバ給電線で接続し、該光ファイバ給電線が光
カプラを含み、該光カプラによって分岐された光信号
を、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 radio base station or radio L according to the seventh to eighth inventions
The ANs are the wireless base station of the first invention or the wireless LAN of the second invention, respectively, wherein the modulator / demodulator and the antenna are connected by an optical fiber feeder, and the optical fiber feeder includes an optical coupler. The optical signal branched by the optical coupler is collected and delivered to a plurality of antennas through the optical fiber feeder device.

【００１４】（作用）第１の発明の無線基地局および第
２の発明の無線ＬＡＮ端末において、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５０μm 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) In the wireless base station of the first invention and the wireless LAN terminal of the second invention, by increasing the fiber core diameter of the optical fiber transmission line to 100 μm or more, a single core diameter of 10 μm or less is obtained. Compared to the case of using a mode fiber or a multimode fiber with a core diameter of about 50 μm, the restrictions on the accuracy of fusion of optical fibers and the accuracy of connection with optical components are alleviated. realizable.

【００１５】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。It is well known that when a laser diode is used as a light source of an optical fiber transmission line, the relative intensity noise characteristic of the laser diode is deteriorated by the influence of the returning light. If the core diameter of the multimode optical fiber is sufficiently larger than the light emitting surface of the laser diode, the amount of light returning to the inside of the laser diode will be small even if there is a reflection point in the optical fiber transmission line. It is possible to reduce deterioration of intensity noise.

【００１６】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。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。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 Ｊｏｕｒｎａｌ ｏｆ Ｓｅｌｅｃ
ｔｅｄ Ａｒｅａｓ ｉｎ Ｃｏｍｍｕｎｉｃａｔｉｏ
ｎ）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。Generally, when a wireless signal is optically transmitted by using a multimode optical fiber, an interference pattern is generated between signal lights of respective modes at a fiber end face and a connecting portion, and mode noise is generated. However, since the number of modes of a multimode optical fiber increases in proportion to the square of the fiber core diameter, increasing the fiber core diameter averages the light intensity distribution at the fiber end face and the connecting portion, and the code noise The impact is reduced. Regarding the relationship between the number of modes and the mode noise of this multimode optical fiber, see, for example, Konen (A.
M. J. KOENEN), IEEE Journal of Selec
ted Areas in Communicatio
n) Volume 4, No. 9, page 1515, Formula (2). In the present invention, the mode noise is suppressed to a negligible level by increasing the fiber core diameter to 100 μm or more.

【００１７】第３の発明の光ファイバ給電線装置は、光
ファイバ伝送路の送信光源に、低干渉性のファブリ・ペ
ローレーザダイオードまたは発光ダイオードを使用す
る。光源の干渉性が低下することにより、前述の多モー
ドファイバで生じるモード雑音の影響を軽減できる。In the optical fiber feeder circuit of the third invention, a Fabry-Perot laser diode or a light emitting diode having low coherence is used as the transmission light source of the optical fiber transmission line. By reducing the coherence of the light source, it is possible to reduce the influence of the mode noise generated in the above-mentioned multimode fiber.

【００１８】第４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。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。In the optical fiber feeder system of the fourth invention,
The flow of radio signals from the antenna to the optical transmitter and from the optical receiver to the antenna is switched by electrical switches. Also, the flow of wireless signals from the modulator to the optical transmitter and from the optical receiver to the demodulator is also switched by electrical switches. With such a configuration, it is possible to unify the radio signal input / output system of the antenna and the optical fiber feeding line device, and the modulator / demodulator and the optical fiber feeding line device, and simplify the device configuration.

【００１９】第５〜７の発明の無線基地局および無線Ｌ
ＡＮ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。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。Radio base stations and radio L of the fifth to seventh inventions
In the AN, the optical fiber feeder device and the modulator / demodulator are connected via an electrical demultiplexer. With such a configuration, an antenna can be installed via the optical fiber feeder line device without adding a modulator / demodulator to a conventional wireless base station or wireless LAN terminal that does not use the optical fiber feeder line transmission line. It becomes possible to connect.

【００２０】第７〜８の発明の無線基地局および無線Ｌ
ＡＮでは、光ファイバ給電線装置が光カプラを含み、こ
の光カプラを介して無線信号が複数の無線エリアに置か
れたアンテナに集配される。この様な構成にすることに
より、複数のアンテナに接続された光ファイバ給電線
の、変復調器側の光送信器および光受信器を共通化し、
装置構成を簡略化することが可能になる。A radio base station and a radio L according to the seventh to eighth inventions
In the AN, the optical fiber feeder device includes an optical coupler through which radio signals are collected and delivered to antennas placed in a plurality of radio areas. With such a configuration, the optical transmitter and the optical receiver of the modulator / demodulator side of the optical fiber feeder connected to the plurality of antennas are made common,
It is possible to simplify the device configuration.

【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 the first embodiment of the present invention. In FIG. 1, the 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 directly transmit / receive a radio signal to / from the antenna 72 of the radio base station 5, but is in 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。Radio signal 100 transmitted from mobile terminal 3
Is received by the antenna 71a of the remote antenna device 4a, the unnecessary frequency component is removed by the bandpass filter 20a, and then 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 transmitted by the optical receiver 13a of the radio base station 5 through the multimode optical fiber transmission line 2a. Here, the fiber core diameter of the multimode optical fiber transmission line is 100 μm.
By using m or more, as described in the section of operation, it facilitates connection between optical fibers and optical components,
It is possible to reduce the influence of noise caused by the return light from the multimode optical fiber transmission line to the electric / optical converter and further reduce the influence of mode noise generated in the multimode optical fiber transmission line. The optical receiver 13a includes an optical / electrical converter, an amplifier, etc., and converts the input optical signal 202a into the wireless signal 106a. The radio signal 106a is sent to the demultiplexer 3 via the circulator 22a.
It is input to 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 the larger the number of branches, the more antennas can be connected. The output radio signal 109 of the duplexer is input to the modulator / demodulator 40 and demodulated into the call signal 300. The demodulated call signal 300 is transmitted to a central station that controls a plurality of radio 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 previous section, the antenna 72 of the radio base station 5
Wireless signals transmitted and received by the remote antennas 4a and 4
Although the radio signals transmitted and received by the antennas 71a and 71b of b are not described as interfering with each other, in reality, there are cases where a plurality of antennas can simultaneously transmit and receive radio signals. In this case, the radio signal (uplink) transmitted from the mobile terminal 3 is transmitted to the antennas 71a and 71a.
b and 72, the demodulator 40 of the radio base station recognizes them as multipath signals having different reception levels and reception delay differences, and equalizes them by a transversal filter or digital signal processing. Also,
The 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 equalized.

【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 structure for connecting a wireless LAN between rooms. The wireless LAN is mainly used indoors, and the range covered by one antenna 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 cable. In FIG. 2, the wireless area X and the wireless area Y are partitioned 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 arranged in the wireless area X, the wireless LAN terminal 6 is arranged in the wireless area Y,
Both are connected by a wired LAN cable 9.
The wireless signal 100 emitted from the wireless LAN terminal 8 in the wireless area X is received by the antenna 75 and demodulated into the 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 the baseband signal 301 in the wired LAN / wireless LAN bridge 60.
Is input to the wireless LAN terminal 6. Wireless LA
The N terminal 6 modulates the baseband signal 301 into a radio signal again and transmits it from the antenna 74 to the radio area Y. Further, the wireless signal received by the antenna 74 in the wireless area Y is also transmitted to the wireless area X in the same manner. As described above, in the conventional wireless LAN, since the wired LAN is used for connection between the rooms, a wireless modulator / demodulator and a wired LAN / wireless LAN connection bridge are required for each room.

【００２６】図３に、本発明の第２の発明である無線Ｌ
ＡＮ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 a wireless L which is the second invention of the present invention.
The structure of AN is shown. In FIG. 3, as in FIG. 2, the wireless area X and the wireless area Y are partitioned by a wall or the like, and direct wireless signals cannot be communicated with each other. The wireless LAN terminal 6 and the remote antenna 4a are arranged in the wireless areas X and Y, respectively, and both are connected by the multimode optical fiber transmission lines 1a and 2a. Remote antenna device 4
The functions of the optical transmitter a, the optical receiver and the modulator / demodulator of the wireless LAN terminal 6 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 wireless signal is directly changed to the intensity modulation of the optical signal, and the subcarrier multiplexing is performed. Wireless signal modulator / demodulator or 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 connection device with a high-cost wired LAN 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 the third embodiment of the present invention. In the case of a wireless system such as a wireless LAN, transmission and reception of terminals are switched in time.
Therefore, the switch 27 is added to the demultiplexer 31 of the wireless LAN terminal 6.
To connect the input / output radio signal 107a of the demultiplexer 31 to the input radio signal 105a to the optical transmitter 10a and the optical receiver 13a.
The output wireless signal 106a from a is switched to. As the control signal of the switch 27, the switch control signal 400 is extracted from the modulator / demodulator 41 and used. Actually, the wireless LAN terminal has a control signal for changing the operation mode of the electronic circuit at the time of transmitting, receiving and waiting for the wireless signal in order to reduce the power consumption, and therefore this is used. Further, the switch control signal 400 is modulated by the amplitude modulator 81 into the control signal 401 having a frequency sufficiently lower than that of the radio signal,
The multiplexer 33 subcarrier multiplexes the radio signal. In the remote antenna 4a, the received wireless signal 103a
Of the switch control signal 403 is extracted by the amplitude demodulator 80 after a part of the signal is extracted by the demultiplexer 32 and the control signal is extracted by the low frequency pass filter 23. With such a configuration, it becomes possible to connect the optical transmitter input and the optical receiver output of the radio signal to the antenna terminal without using the circulator. Further, by using the signal for transmission / reception switching to the optical transmitter / receiver 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２０２ｃ、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 the configuration of a radio base station which is the fourth embodiment of the present invention. The functions of the radio base station 5 and the remote antenna devices 4a and 4b are the same as those in the first embodiment. The output optical signal 201a from the wireless base station 5 is branched 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. The output optical signals 202c and 202d of the remote antenna devices 4a and 4b are combined by the optical coupler 25 and input to the optical receiver of the wireless base station. With such a configuration, the remote antenna devices 4a, 4b
The optical transmitter / receiver on the side of the wireless base station can be shared, 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 need to be separated in wavelength so that beat noise is not generated in the optical receiver 13a. There is.

【００２９】図６に、本発明の第５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 which is a fifth embodiment of the present invention. The radio base station 5 and the remote antenna device 4a are connected by the multimode optical fibers 1a and 2a, and the remote antenna devices 4a and 4b are connected by the multimode optical fibers 1b and 2b. The optical signal is non-regenerated and 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 receiver 15 of the remote antenna device 4a once converts the signal into a wireless signal, and the wireless signal 113 received by the antenna 71a is multiplexed via the demultiplexer 35, and the optical transmitter 1
The optical signal 202a is converted again by 1a and is received by the optical receiver of the radio base station 5 through the multimode optical fiber transmission line 2a. In addition, the transmission optical signal 201 from the wireless base station
The light a is converted into an electric signal by the optical receiver 12a of the remote antenna device 4a, and then branched by the demultiplexer 34. The branched radio signal 110 is amplified to a proper intensity by the amplifier 90, and then the circulator 12a.
Then, the signal is 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 the 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 bandpass filter 20b. With such a configuration, the wavelength of the light source passing through the optical fiber transmission line becomes single. Therefore, the problem of beat noise, which has been a problem in the method of multiplexing optical signals on the optical fiber transmission line, can be avoided, and 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 wireless communication system such as a mobile phone or a wireless LAN, a wireless signal is supplied to an antenna dead zone by using an optical transmission line with low noise and which can be easily connected. Can be realized.

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

【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 is a 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 is a configuration for connecting a conventional wireless LAN 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 is 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 is a configuration of a wireless LAN according to a third embodiment of the present invention.

【図５】本発明の第４の実施例の無線基地局の構成であ
る。FIG. 5 is a configuration of a radio base station according to a fourth embodiment of the present invention.

【図６】本発明の第５の実施例の無線基地局の構成であ
る。FIG. 6 is a configuration of a radio base station according to a fifth embodiment of the present invention.

【符号の説明】[Explanation of symbols]

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 Splitter 40, 41 Modulator / demodulator 60, 61 Wireless LAN / Wired LAN bridge 70, 71a, 71b, 72, 73 Antenna 80 Amplitude demodulator 81 Amplitude modulator 100, 101a, 101b, 102a, 102b, 1
03a-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

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】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ことを特徴とする無線基地
局。1. An antenna for transmitting and receiving a radio signal to and from a mobile terminal, a modulator / demodulator for converting the radio signal and a call signal, and an optical fiber feeder line connecting the antenna and the modulator / demodulator. The optical fiber feeder is composed of an optical transmitter for converting a wireless signal into an optical signal, an optical fiber transmission line for transmitting an optical signal output from the optical transmitter, and an optical fiber for converting an output of the optical fiber transmission line into a wireless signal. A radio base station configured by a receiver, wherein a multimode optical fiber having a core diameter of 100 μm or more is used as the optical fiber transmission line. 【請求項２】無線ローカルエリアネットワーク（無線Ｌ
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ことを特徴とする無線ＬＡ
Ｎ。2. A wireless local area network (wireless L
AN) a plurality of antennas for transmitting and receiving radio signals to and from a terminal, a modulator / demodulator for converting the radio signals and baseband signals, and an optical fiber feeder line connecting the antennas and the modulator / demodulator. The fiber feeder is composed of an optical transmitter for converting a radio signal into an optical signal, an optical fiber transmission line for transmitting an optical signal output from the optical transmitter, and an optical receiver for converting an output of the optical fiber transmission line into a radio signal. In a wireless LAN configured by a multi-mode optical fiber, a multi-mode optical fiber having a core diameter of 100 μm or more is used as the optical fiber transmission line.
N. 【請求項３】請求項１記載の無線基地局または請求項２
記載の無線ＬＡＮにおける光ファイバ給電線装置であっ
て、 前記光送信器の光源に、ファブリ・ペローレーザダイオ
ードまたは発光ダイオードを使用することを特徴とする
光ファイバ給電線装置。3. The radio base station according to claim 1 or claim 2.
An optical fiber feeder device in the wireless LAN according to claim 1, wherein a Fabry-Perot laser diode or a light emitting diode is used as a light source of the optical transmitter. 【請求項４】請求項１記載の無線基地局または請求項２
記載の無線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。4. The radio base station according to claim 1 or claim 2.
An optical fiber feeder for a wireless LAN according to claim 1, further comprising an electrical switch for switching an input wireless signal from the antenna to an optical transmitter and an output wireless signal from the optical receiver to the antenna, and the modulation. An optical fiber feeder device having an electrical switch for switching between an input wireless signal from a transmitter to an optical transmitter and an output wireless signal from an optical receiver to a demodulator. 【請求項５】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請求項１記載の無線基地局。5. A modulator / demodulator and an electrical demultiplexer are connected, and a radio signal branched by the demultiplexer is collected or delivered to a plurality of antennas directly or via the optical fiber feeder circuit. The radio base station according to claim 1, wherein the radio base station is a radio base station. 【請求項６】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請求項２記載の無線ＬＡＮ。6. A modulator / demodulator and an electrical demultiplexer are connected, and a radio signal branched by the demultiplexer is collected and delivered to a plurality of antennas directly or through the optical fiber feeder device. The wireless LAN according to claim 2, wherein the wireless LAN is a wireless LAN. 【請求項７】変復調器とアンテナとを光ファイバ給電線
で接続し、該光ファイバ給電線が光カプラを含み、該光
カプラによって分岐された光信号を、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
とする請求項１記載の無線基地局。7. A modulator / demodulator and an antenna are connected by an optical fiber feed line, the optical fiber feed line includes an optical coupler, and an optical signal branched by the optical coupler is passed through the optical fiber feed line device. The radio base station according to claim 1, wherein the radio base station collects and delivers the plurality of antennas. 【請求項８】変復調器とアンテナとを光ファイバ給電線
で接続し、該光ファイバ給電線が光カプラを含み、該光
カプラによって分岐された光信号を、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
とする請求項２記載の無線ＬＡＮ。8. A modulator / demodulator and an antenna are connected by an optical fiber feed line, the optical fiber feed line includes an optical coupler, and an optical signal branched by the optical coupler is passed through the optical fiber feed line device. The wireless LAN according to claim 2, wherein the wireless LAN is collected and delivered to a plurality of antennas.
JP7236469A 1995-09-14 1995-09-14 Wireless base station, wireless local area network, and optical fiber feeder Expired - Fee Related JP2900853B2 (en)

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