JPH08167876A - Optical transmission wireless base station and reception diversity method - Google Patents
Optical transmission wireless base station and reception diversity methodInfo
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- JPH08167876A JPH08167876A JP6311856A JP31185694A JPH08167876A JP H08167876 A JPH08167876 A JP H08167876A JP 6311856 A JP6311856 A JP 6311856A JP 31185694 A JP31185694 A JP 31185694A JP H08167876 A JPH08167876 A JP H08167876A
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Abstract
(57)【要約】
【目的】 光伝送無線基地局において、受信ダイバーシ
チにおける電気／光変換器、光ファイバ、光／電気変換
器等の各アンテナ毎の系統を削減して経済化を図りた
い。
【構成】 ２つのアンテナ１、２で同一無線機３３から
の信号（ｆ1、ｆ1）を受信する。一方の受信信号を周波
数変換器３−１でｆ2に変換する。これを合成器４で周
波数多重化する。この周波数多重化信号を電気／光変換
器５−１で光信号に変換し、光ファイバ伝送路６−１へ
送る。中央基地局２２では、光／電気変換器７−１で電
信号に変換し、多重分離器８で各周波数信号に分離す
る。この分離した２つの受信信号のダイバーシチ処理を
回路１０で行う。
(57) [Abstract] [Purpose] In an optical transmission radio base station, we would like to reduce the system for each antenna, such as the electrical / optical converter, optical fiber, optical / electrical converter, etc., in receiving diversity to achieve economic efficiency. [Structure] Two antennas 1 and 2 receive signals (f 1 , f 1 ) from the same radio device 33. One received signal is converted into f 2 by the frequency converter 3-1. This is frequency-multiplexed by the synthesizer 4. The frequency-multiplexed signal is converted into an optical signal by the electric / optical converter 5-1 and sent to the optical fiber transmission line 6-1. In the central base station 22, the optical / electrical converter 7-1 converts it into an electric signal, and the demultiplexer 8 separates it into each frequency signal. The circuit 10 performs diversity processing on the two separated reception signals.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、副搬送波多重アナログ
光伝送を用いた無線基地局及び受信ダイバーシチ方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station using subcarrier multiplexed analog optical transmission and a reception diversity method.
【０００２】[0002]
【従来の技術】自動車／携帯電話や第２世代コードレス
電話などの移動体通信では周波数の再利用のため、電波
があまり遠くまで到達しないようにすることと、アンテ
ナの小型化等を考慮して８００ＭＨｚから１〜２ＧＨｚ
程度の周波数帯が使用されている。このＵＨＦ帯の電波
は、山やビル等の建造物などで効率良く反射されるた
め、送信機と受信機を結ぶ電波の伝搬経路が見通しの直
線以外に複数存在するマルチパス現象が観測される。マ
ルチパスによって受信機に入力される信号の振幅と位相
が変化するフェージングが発生する。実際の移動体通信
環境では伝搬経路は無数にあるため、各々の経路の電波
の反射強度も異なるので伝搬特性は極めて複雑になる。
このマルチパスによるフェージングに対応するため空間
ダイバーシチ受信方式が一般に用いられている。空間ダ
イバーシチは、アンテナの設置場所がある程度離れてい
るとフェージングの様子は独立に変化することを利用す
るものである。基本的に複数のアンテナを用意し受信状
態の良好なアンテナの受信信号を利用するものであり、
たまたま全てのアンテナがフェージングの谷に落ちてい
ないかぎり良好な受信ができる。１本のアンテナの場合
で受信状態の劣悪な時間が平均１０％とすると、アンテ
ナを２本にすることで受信状態の劣悪な時間比率は１
％、３本では０．１％に減少する。設置する複数のアン
テナの間隔は、１／４波長以上あれば良い。８００ＭＨ
ｚ帯では１０ｃｍ程度の間隔があれば良いことになる。2. Description of the Related Art In mobile communication such as automobiles / cell phones and second-generation cordless phones, frequencies are reused, so that radio waves do not reach too far and antennas are downsized. 800MHz to 1-2GHz
Some frequency bands are used. Since the UHF band radio waves are efficiently reflected by buildings such as mountains and buildings, a multipath phenomenon in which a plurality of radio wave propagation paths connecting the transmitter and the receiver are present other than the straight line of sight is observed. . The multipath causes fading in which the amplitude and phase of the signal input to the receiver change. In an actual mobile communication environment, since there are innumerable propagation paths, the reflection intensity of the radio wave of each path also differs, and the propagation characteristics become extremely complicated.
In order to deal with fading due to this multipath, a space diversity reception system is generally used. Space diversity uses the fact that fading changes independently when antennas are installed at some distance. Basically, multiple antennas are prepared and the received signals from the antennas in good reception are used.
Good reception is possible unless all the antennas happen to fall into the fading valley. If the average time of poor reception is 10% in the case of one antenna, the ratio of poor time of reception is 1 by using two antennas.
%, It decreases to 0.1% with three lines. The distance between the plurality of antennas to be installed may be ¼ wavelength or more. 800 MH
In the z band, it is sufficient if there is an interval of about 10 cm.
【０００３】[0003]
【発明が解決しようとする課題】一方、移動体通信分野
では、周波数の再利用の観点から１つの無線基地局のカ
バーする範囲（セル）を小さくするマイクロセル化が注
目されている。マイクロセルでは、無線基地局の数が増
える。設置場所にも制限を受ける、ハンドオーバが頻繁
に発生するなどの課題があり、これを解決する方法とし
てアナログ光伝送を用いた無線基地局装置が提案されて
いる。これは、従来の無線基地局の無線変復調装置、制
御装置等を中央に集中して配置し（以下中央無線基地局
と記述）、多数配置される無線基地局（以下中継無線基
地局と記述）は、基本的にアンテナ、送受信増幅器のみ
の構成として、基地局の小型化、簡易化、経済化を指向
したものである。中央無線基地局と多数配置された中継
無線基地局との間は無線周波数の高周波を変調信号とし
たアナログ光伝送で結ぶものである。On the other hand, in the field of mobile communication, attention has been paid to the formation of microcells for reducing the range (cell) covered by one radio base station from the viewpoint of frequency reuse. In the micro cell, the number of radio base stations increases. There are problems such as restrictions on the installation location and frequent occurrence of handovers. As a method for solving these problems, a wireless base station device using analog optical transmission has been proposed. This is because the radio modulator / demodulators and control devices of conventional radio base stations are centrally arranged in the center (hereinafter referred to as central radio base station), and a large number of radio base stations are arranged (hereinafter referred to as relay radio base station). Is basically aimed at downsizing, simplification, and economic efficiency of a base station, with only an antenna and a transmission / reception amplifier. The central radio base station and a large number of relay radio base stations are connected by analog optical transmission using a high frequency radio frequency as a modulation signal.
【０００４】図２は従来の無線基地局の構成図である。
移動無線機３３に対して、２つのアンテナ１、２を設け
ておく。中継基地局１１は、この２つのアンテナ１、２
からの受信信号を各々増幅器１３−１、１３−２で増幅
し、電気／光変換器５−１、５−２で光信号に変換す
る。光ファイバ伝送路６−１、６−２がこの光信号を伝
送する。中央基地局２２は、光ファイバ伝送路６−１、
６−２からの光信号を光／電気変換器７−１、７−２で
電気信号に変換し、増幅器１３−４、１３−５で増幅
し、ダイバーシチ処理回路１０でダイバーシチ受信を行
う。この受信信号は復調器１２で復調される。FIG. 2 is a block diagram of a conventional radio base station.
The mobile radio 33 is provided with two antennas 1 and 2. The relay base station 11 uses the two antennas 1, 2
The received signals from A to A are amplified by amplifiers 13-1 and 13-2, respectively, and converted into optical signals by electric / optical converters 5-1 and 5-2. The optical fiber transmission lines 6-1 and 6-2 transmit this optical signal. The central base station 22 includes an optical fiber transmission line 6-1,
The optical signal from 6-2 is converted into an electrical signal by the optical / electrical converters 7-1 and 7-2, amplified by the amplifiers 13-4 and 13-5, and diversity reception is performed by the diversity processing circuit 10. This received signal is demodulated by the demodulator 12.
【０００５】一方、無線機３３への送信は、無線基地局
２２の変調器１４で得た変調信号を増幅器１３−６で増
幅し、電気／光変換器５で光信号に変換し、光ファイバ
伝送路６−３を介して伝送する。中継基地局１１では、
光ファイバ伝送路６−３からの光信号を光／電気変換器
７−３で電気信号に変換し、アンテナ共用器１５を介し
てアンテナ２に送り、無線機３３へ送信を行う。On the other hand, for transmission to the radio device 33, the modulated signal obtained by the modulator 14 of the radio base station 22 is amplified by the amplifier 13-6, converted into an optical signal by the electric / optical converter 5, and the optical fiber is used. It is transmitted via the transmission path 6-3. In the relay base station 11,
The optical signal from the optical fiber transmission line 6-3 is converted into an electric signal by the optical / electrical converter 7-3, sent to the antenna 2 via the antenna duplexer 15, and transmitted to the radio device 33.
【０００６】図２から明らかなように、従来例では、受
信アンテナ１、２の２つを持つ場合、そのアンテナの数
だけ、電気／光変換器、光ファイバ、光／電気変換器を
必要としている。As is apparent from FIG. 2, in the conventional example, when two receiving antennas 1 and 2 are provided, an electric / optical converter, an optical fiber, and an optical / electrical converter are required by the number of the antennas. There is.
【０００７】本発明の目的は、部品点数の大幅削減をは
かる無線基地局、及び受信ダイバーシチ方法を提供する
ものである。An object of the present invention is to provide a radio base station and a receiving diversity method which can reduce the number of parts significantly.
【０００８】[0008]
【課題を解決するための手段】本発明は、無線通信の相
手となる無線機の電波を受信する、複数の空間的に分離
された受信アンテナと、複数の受信アンテナの受信無線
信号のうち１つを除いた残りの受信無線信号を各々異な
った周波数へ周波数変換する手段と、これらの周波数変
換された受信信号と周波数変換操作を受けていない受信
信号を合成し周波数多重化する手段と、この周波数多重
化信号を変調信号としてアナログ光変調を行う手段と、
を備えた固定中継基地局と、固定中継基地局に接続され
てアナログ光変調した信号を伝送する光ファイバ伝送路
と、光ファイバ伝送路からのアナログ光変調された信号
を電気信号に変換する手段と、電気信号である周波数多
重化信号を分離する手段と、分離された異なった周波数
の受信信号相互で受信ダイバーシチを行う手段と、を備
えた中央基地局と、より成る光伝送無線基地局を開示す
る。SUMMARY OF THE INVENTION According to the present invention, one of a plurality of spatially separated receiving antennas for receiving radio waves of a wireless device which is a partner of wireless communication and one of a plurality of receiving wireless signals of the receiving antennas is received. Means for frequency-converting the remaining received radio signals except for one to different frequencies, means for synthesizing these frequency-converted received signals and received signals that have not been subjected to frequency conversion operation, and frequency-multiplexing, Means for performing analog optical modulation using the frequency multiplexed signal as a modulation signal,
A fixed relay base station, an optical fiber transmission line connected to the fixed relay base station for transmitting an analog optical modulated signal, and means for converting an analog optical modulated signal from the optical fiber transmission line into an electric signal An optical transmission radio base station comprising a central base station having means for separating a frequency-multiplexed signal which is an electric signal, and means for performing reception diversity between separated reception signals of different frequencies. Disclose.
【０００９】更に本発明は、無線通信の相手となる無線
機の電波を受信する、複数の空間的に分離された受信ア
ンテナと、複数の受信アンテナの受信無線信号を各々異
なった周波数へ周波数変換する手段と、これらの周波数
変換された受信信号を合成し周波数多重化する手段と、
この周波数多重化信号を変調信号としてアナログ光変調
を行う手段と、を備えた固定中継基地局と、固定中継基
地局に接続されてアナログ光変調した信号を伝送する光
ファイバ伝送路と、光ファイバ伝送路からのアナログ光
変調された信号を電気信号に変換する手段と、電気信号
である周波数多重化信号を分離する手段と、分離された
異なった周波数の受信信号相互で受信ダイバーシチを行
う手段と、を備えた中央基地局と、より成る光伝送無線
基地局を開示する。Further, according to the present invention, a plurality of spatially separated receiving antennas for receiving the radio waves of a radio device which is a partner of wireless communication, and frequency conversion of the receiving radio signals of the plurality of receiving antennas to different frequencies. Means for synthesizing and frequency-multiplexing these frequency-converted received signals,
A fixed repeater base station having means for performing analog optical modulation using this frequency-multiplexed signal as a modulation signal, an optical fiber transmission line connected to the fixed repeater base station for transmitting an analog optically modulated signal, and an optical fiber Means for converting an analog optical modulated signal from the transmission line into an electric signal, means for separating a frequency multiplexed signal which is an electric signal, and means for performing reception diversity between the separated reception signals of different frequencies. , And a central base station having an optical transmission radio base station.
【００１０】更に本発明は、中継無線基地局の複数のア
ンテナで受信された、同一の無線機からの同一周波数の
受信信号群を互いに異なるような周波関係になるものと
した上で、これを周波数多重化してアナログ光伝送し、
中央無線基地局ではアナログ光変調信号の復調後に得ら
れる周波数多重化信号から受信ダイバーシチ処理を行う
ようにした受信ダイバーシチ方法を開示する。Further, according to the present invention, the received signal groups of the same frequency received from the plurality of antennas of the relay radio base station and having the same frequency are set to have different frequency relationships from each other. Frequency multiplexing and analog optical transmission,
Disclosed is a reception diversity method in which a central radio base station performs a reception diversity process from a frequency multiplexed signal obtained after demodulation of an analog optical modulation signal.
【００１１】[0011]
【作用】本発明によれば、電気／光変換器、光ファイバ
伝送路、光／電気変換器は、その周波数多重化信号を伝
送するに必要な数だけを設けておくだけで、複数のアン
テナでの同一無線機からの受信信号が受信され、受信ダ
イバーシチが可能となる。According to the present invention, a plurality of electric / optical converters, optical fiber transmission lines, and optical / electrical converters can be provided by providing only the necessary number for transmitting the frequency-multiplexed signals. The received signal from the same radio device in 1 is received, and reception diversity becomes possible.
【００１２】[0012]
【実施例】本発明の各実施例を図１、図３、図４、図５
に示す。簡単のため、図２に示した送信系と同様の送信
系は（１３−６、５、７−３、１３−３、１５）省略
し、且つ受信アンテナ２本の例で説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the present invention is shown in FIGS.
Shown in For simplification, a transmission system similar to the transmission system shown in FIG. 2 is omitted (13-6, 5, 7-3, 13-3, 15), and an example of two receiving antennas will be described.
【００１３】図１は、本発明の第１の実施例の構成を示
す図である。本実施例は、周波数変換器３−１、合成器
４、多重分離器８を設けた点が、特徴であり、且つ伝送
路は１つの伝送路６−１のみとした点が特徴である。中
継無線基地局１１は、２本の受信アンテナ１、２を有
し、中央無線基地局２２とは光ファイバ６−１で接続さ
れている。通信相手の無線機３３からの周波数ｆ1の無
線信号は、空間的に分離して配置された受信アンテナ１
及び２によって高周波信号としてとらえられる。本実施
例では受信アンテナ２でとらえられた高周波信号を周波
数変換器３−１によって第２の周波数ｆ2に周波数変換
し、受信アンテナ１でとらえられた高周波信号と併せて
合成器４によって周波数多重化信号としている。この周
波数多重化信号を電気／光変換器５−１によってアナロ
グ光信号に変換し、中央無線基地局２２へ光ファイバ６
−１により伝送する。中央無線基地局２２では、光／電
気変換器７−１によってアナログ光信号を復調し、周波
数多重化信号を復元する。この周波数多重化信号を例え
ば複数のバンドパスフィルタからなる多重分離器８によ
って、ｆ1とｆ2の周波数成分に分離する。得られた２つ
の高周波信号ｆ1、ｆ2はそのまま、ダイバーシチ処理回
路１０に入力して処理され、復調器１２に対し、受信状
態の良好な方の信号が出力される。ダイバーシチ処理と
は、どちらか一方を選ぶのではなく互いにｆ1、ｆ2との
信号の両者を相補（例えば２乗平均）するような出力を
得る例もある。FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention. This embodiment is characterized in that the frequency converter 3-1, the combiner 4, and the demultiplexer 8 are provided, and that only one transmission path 6-1 is used as a transmission path. The relay wireless base station 11 has two receiving antennas 1 and 2 and is connected to the central wireless base station 22 by an optical fiber 6-1. The radio signal of the frequency f 1 from the radio device 33 of the communication partner is received spatially separated by the receiving antenna 1
And 2 are regarded as high frequency signals. In the present embodiment, the high frequency signal captured by the receiving antenna 2 is frequency-converted to the second frequency f 2 by the frequency converter 3-1 and is combined with the high frequency signal captured by the receiving antenna 1 by the synthesizer 4. Signal. The frequency-multiplexed signal is converted into an analog optical signal by the electric / optical converter 5-1 and the optical fiber 6 is sent to the central radio base station 22.
-1. In the central wireless base station 22, the optical / electrical converter 7-1 demodulates the analog optical signal to restore the frequency multiplexed signal. This frequency-multiplexed signal is separated into frequency components f 1 and f 2 by a demultiplexer 8 composed of a plurality of bandpass filters, for example. The obtained two high frequency signals f 1 and f 2 are input to the diversity processing circuit 10 as they are and processed, and the signal in the better reception state is output to the demodulator 12. In the diversity processing, there is also an example in which an output is obtained in which both signals f 1 and f 2 are complemented (for example, root mean square) without selecting either one.
【００１４】図３は、本発明の第２の実施例の構成を示
す図である。本実施例は周波数変換器３−２、３−３を
設けた点が特徴である。第１の実施例と同様に、中継無
線基地局１１では、通信相手の無線機３３からの周波数
ｆ1の無線信号は、空間的に分離して配置された受信ア
ンテナ１及び２によって高周波信号としてとらえられ
る。これらの受信信号を周波数変換器３−２、３−３に
よって各々異なった周波数ｆ2、ｆ3に変換した後、合成
器４によって周波数多重化信号とし、電気／光変換の後
光伝送する。中央無線基地局２２では光／電気変換後、
多重分離器８によってｆ2とｆ3の周波数成分に分離す
る。これらの信号はそのまま、ダイバーシチ処理回路１
０に入力し、ダイバーシチ処理される。FIG. 3 is a diagram showing the configuration of the second embodiment of the present invention. This embodiment is characterized in that frequency converters 3-2 and 3-3 are provided. Similar to the first embodiment, in the relay radio base station 11, the radio signal of the frequency f 1 from the radio device 33 of the communication partner is converted into a high frequency signal by the receiving antennas 1 and 2 which are spatially separated. Be captured. These received signals are converted into different frequencies f 2 and f 3 by the frequency converters 3-2 and 3-3, and then converted into frequency multiplexed signals by the combiner 4 and are optically transmitted after electrical / optical conversion. In the central radio base station 22, after optical / electrical conversion,
The demultiplexer 8 separates the frequency components of f 2 and f 3 . The diversity processing circuit 1 outputs these signals as they are.
Enter 0 to perform diversity processing.
【００１５】以上、本発明の構成を実施例をあげて説明
した。説明図は、本発明の概念を説明することが目的で
あり、本発明の最小限の構成を示したものである。従っ
て、実機の構成では必要に応じて必要な箇所に増幅器等
の回路が付加される場合があることは言うまでもない。The configuration of the present invention has been described with reference to the embodiments. The explanatory diagram is intended to explain the concept of the present invention, and shows the minimum configuration of the present invention. Therefore, it goes without saying that circuits such as amplifiers may be added where necessary in the configuration of the actual machine.
【００１６】[0016]
【発明の効果】本発明によれば、従来アナログ光伝送無
線基地局装置において、受信ダイバーシチ信号の数だけ
必要とされた、電気／光変換器、光ファイバ、光／電気
変換器の１組にすることができる。従って、機器構成が
簡単になる。電気部品の価格に比べ、大まかに言って１
０〜１００倍程度高価な光部品を減らすことができるた
め経済化が図れる。また、光ファイバの敷設本数を削減
できるため伝送路にかかる費用も削減できる。According to the present invention, in the conventional analog optical transmission radio base station apparatus, one set of the electric / optical converter, the optical fiber, and the optical / electrical converter, which is required for the number of reception diversity signals, is provided. can do. Therefore, the device configuration becomes simple. Roughly speaking, compared to the price of electrical parts, 1
Since it is possible to reduce the number of expensive optical components of 0 to 100 times, economic efficiency can be achieved. Further, since the number of optical fibers to be installed can be reduced, the cost for the transmission line can be reduced.
【図１】本発明の第１の光伝送無線基地局の実施例図で
ある。FIG. 1 is a diagram showing an embodiment of a first optical transmission radio base station of the present invention.
【図２】従来の光伝送無線基地局を示す図である。FIG. 2 is a diagram showing a conventional optical transmission radio base station.
【図３】本発明の第２の光伝送無線基地局の実施例図で
ある。FIG. 3 is an embodiment diagram of a second optical transmission radio base station of the present invention.
１、２ アンテナ ３−１ 周波数変換器 ４ 合成器 ５−１ 電気／光変換器 ６−１ 光ファイバ伝送路 ７−１ 光／電気変換器 ８ 多重分離器 ９−１ 周波数変換器 １０ ダイバーシチ処理回路 １２ 復調器 1, 2 antenna 3-1 frequency converter 4 combiner 5-1 electric / optical converter 6-1 optical fiber transmission line 7-1 optical / electrical converter 8 demultiplexer 9-1 frequency converter 10 diversity processing circuit 12 Demodulator
Claims (3)
信する、複数の空間的に分離された受信アンテナと、複
数の受信アンテナの受信無線信号のうち１つを除いた残
りの受信無線信号を各々異なった周波数へ周波数変換す
る手段と、これらの周波数変換された受信信号と周波数
変換操作を受けていない受信信号を合成し周波数多重化
する手段と、この周波数多重化信号を変調信号としてア
ナログ光変調を行う手段と、を備えた固定中継基地局
と、 固定中継基地局に接続されてアナログ光変調した信号を
伝送する光ファイバ伝送路と、 光ファイバ伝送路からのアナログ光変調された信号を電
気信号に変換する手段と、電気信号である周波数多重化
信号を分離する手段と、分離された異なった周波数の受
信信号相互で受信ダイバーシチを行う手段と、を備えた
中央基地局と、より成る光伝送無線基地局。1. A plurality of spatially separated receiving antennas for receiving radio waves of a radio device as a partner of wireless communication, and the remaining receiving radio waves except one of the receiving radio signals of the plurality of receiving antennas. Means for frequency-converting signals to different frequencies, means for synthesizing these frequency-converted reception signals and reception signals that have not been subjected to frequency conversion operation for frequency multiplexing, and this frequency-multiplexed signal as a modulation signal A fixed repeater base station equipped with means for performing analog optical modulation, an optical fiber transmission line connected to the fixed repeater base station for transmitting an analog optically modulated signal, and an analog optical modulation from the optical fiber transmission line. A means for converting a signal into an electric signal, a means for separating a frequency-multiplexed signal which is an electric signal, and a means for performing reception diversity between the separated reception signals of different frequencies. When a central base station equipped with more made optical transmission radio base station.
信する、複数の空間的に分離された受信アンテナと、複
数の受信アンテナの受信無線信号を各々異なった周波数
へ周波数変換する手段と、これらの周波数変換された受
信信号を合成し周波数多重化する手段と、この周波数多
重化信号を変調信号としてアナログ光変調を行う手段
と、を備えた固定中継基地局と、 固定中継基地局に接続されてアナログ光変調した信号を
伝送する光ファイバ伝送路と、 光ファイバ伝送路からのアナログ光変調された信号を電
気信号に変換する手段と、電気信号である周波数多重化
信号を分離する手段と、分離された異なった周波数の受
信信号相互で受信ダイバーシチを行う手段と、を備えた
中央基地局と、より成る光伝送無線基地局。2. A plurality of spatially-separated receiving antennas for receiving radio waves of a wireless device as a partner of wireless communication, and means for frequency-converting received wireless signals of the plurality of receiving antennas into different frequencies. , A fixed relay base station provided with means for synthesizing these frequency-converted received signals and frequency-multiplexing, and means for performing analog optical modulation using this frequency-multiplexed signal as a modulation signal. An optical fiber transmission line that is connected and transmits an analog optical modulation signal, a unit that converts the analog optical modulation signal from the optical fiber transmission line into an electric signal, and a unit that separates the frequency multiplexed signal that is the electric signal And a central base station having means for performing reception diversity between reception signals of different frequencies separated from each other, and an optical transmission radio base station comprising:
された、同一の無線機からの同一周波数の受信信号群を
互いに異なるような周波数関係になるものとした上で、
これを周波数多重化してアナログ光伝送し、中央無線基
地局ではアナログ光変調信号の復調後に得られる周波数
多重化信号から受信ダイバーシチ処理を行うようにした
受信ダイバーシチ方法。3. A group of received signals of the same frequency from the same radio, which are received by a plurality of antennas of a relay radio base station, have different frequency relationships from each other, and
A reception diversity method in which this is frequency-multiplexed and analog-optically transmitted, and the central wireless base station performs reception diversity processing from the frequency-multiplexed signal obtained after demodulation of the analog optical modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6311856A JPH08167876A (en) | 1994-12-15 | 1994-12-15 | Optical transmission wireless base station and reception diversity method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6311856A JPH08167876A (en) | 1994-12-15 | 1994-12-15 | Optical transmission wireless base station and reception diversity method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08167876A true JPH08167876A (en) | 1996-06-25 |
Family
ID=18022247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6311856A Pending JPH08167876A (en) | 1994-12-15 | 1994-12-15 | Optical transmission wireless base station and reception diversity method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08167876A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100301296B1 (en) * | 1999-08-19 | 2001-11-01 | 서평원 | Optical relay apparatus for 2 path in mobile communication system |
| US7047028B2 (en) | 2002-11-15 | 2006-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station |
-
1994
- 1994-12-15 JP JP6311856A patent/JPH08167876A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100301296B1 (en) * | 1999-08-19 | 2001-11-01 | 서평원 | Optical relay apparatus for 2 path in mobile communication system |
| US7047028B2 (en) | 2002-11-15 | 2006-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station |
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