JPH05327576A - Diversity transmission/reception system - Google Patents
Diversity transmission/reception systemInfo
- Publication number
- JPH05327576A JPH05327576A JP4147964A JP14796492A JPH05327576A JP H05327576 A JPH05327576 A JP H05327576A JP 4147964 A JP4147964 A JP 4147964A JP 14796492 A JP14796492 A JP 14796492A JP H05327576 A JPH05327576 A JP H05327576A
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- Prior art keywords
- optical
- base station
- signal
- transmission
- signals
- 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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- Mobile Radio Communication Systems (AREA)
- Optical Communication System (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基地局を介して、移動
機端末と集中基地局との間の相互通信を行なう移動通信
方式に関し、特に基地局における複数（例えば２台）の
アンテナの切替えを集中基地局で行なう送受信ダイバー
シチ方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system for performing mutual communication between a mobile terminal and a centralized base station via a base station, and particularly to a plurality of (for example, two) antennas in the base station. The present invention relates to a transmission / reception diversity system in which switching is performed by a centralized base station.
【０００２】[0002]
【従来の技術】従来は、基地局において２アンテナで受
信した無線信号をそれぞれ異なる復調器で復調し、各ア
ンテナの受信信号品質を比較した後、最適な復調器出力
を選択するダイバーシチ受信は全て基地局で行われて来
た。2. Description of the Related Art Conventionally, in a base station, radio signals received by two antennas are demodulated by different demodulators, the received signal qualities of the antennas are compared, and then the diversity reception for selecting an optimum demodulator output is performed. It was done at the base station.
【０００３】図３は従来の実施例を示すブロック図であ
る。基地局６１では交換局から伝送された音声ベースバ
ンド信号が変調器５１に入力され無線信号に変換された
後、スイッチ５２、送受分離器４９、５０を介してアン
テナ４７または４８から移動機端末５９または６０に電
波が放射される。移動機端末５９、６０からの受信信号
は受信器５３、５４を介して復調器５５、５６に入力さ
れ、受信器からのキャリアレベルをレベル検出器５７に
より判定し、受信信号選択スイッチ５８によりレベルの
高い復調器出力を選択する。FIG. 3 is a block diagram showing a conventional embodiment. In the base station 61, the voice baseband signal transmitted from the exchange is input to the modulator 51 and converted into a radio signal, and then the mobile terminal 59 is transmitted from the antenna 47 or 48 via the switch 52 and the transmission / reception separators 49 and 50. Or radio waves are radiated to 60. Received signals from the mobile station terminals 59 and 60 are input to the demodulators 55 and 56 via the receivers 53 and 54, the carrier level from the receiver is determined by the level detector 57, and the level is received by the received signal selection switch 58. Select a demodulator output with high
【０００４】しかし、移動機端末数の増加に対応するた
め、無線ゾーンを縮小すると基地局数が増大するため、
基地局の小型化、簡易化が必要である。However, since the number of base stations increases when the wireless zone is reduced in order to cope with the increase in the number of mobile terminals,
It is necessary to downsize and simplify the base station.
【０００５】この問題を解決するため、集中基地局で送
受信ダイバーシチ制御を行う送受信ダイバーシチ方式が
考えられる。この方式の基本構成として、各ダイバーシ
チ用分岐信号に対し個別に光伝送路を用いる構成が考え
られる。図４に送受信ダイバーシチの基本構成を示す。
この構成では光ファイバは上り回線、下り回線でそれぞ
れ２本ずつ、合計４本の光ファイバが必要となる。In order to solve this problem, a transmission / reception diversity system in which transmission / reception diversity control is performed by a centralized base station is conceivable. As a basic configuration of this system, a configuration in which an optical transmission line is individually used for each diversity branch signal can be considered. FIG. 4 shows the basic configuration of transmission / reception diversity.
In this configuration, two optical fibers are required for each of the upstream and downstream lines, for a total of four optical fibers.
【０００６】なお、図４で、１は集中基地局、２は基地
局、３は変調器、４は送信アンテナ切替スイッチ、５と
６は結合器、７と８と２４と２５は電気／光変換器、１
４と１５と３１と３２は光／電気変換器、１６と１７と
２２と２３は増幅器、１８と１９は送受分離器、２０と
２１はアンテナ、３３と３４は分配器、３５と３６は復
調器、３７は判定器、３８は受信信号選択スイッチ、３
９と６１と４３と６２は光ファイバである。In FIG. 4, 1 is a centralized base station, 2 is a base station, 3 is a modulator, 4 is a transmission antenna changeover switch, 5 and 6 are couplers, 7 and 8, 24 and 25 are electric / optical. Converter, 1
4/15/31/32 are optical / electrical converters, 16/17/22/23 are amplifiers, 18/19 are transceivers, 20/21 are antennas, 33/34 are distributors, and 35/36 are demodulators. , 37 is a judging device, 38 is a received signal selection switch, 3
9 and 61 and 43 and 62 are optical fibers.
【０００７】[0007]
【発明が解決しようとする課題】この基本構成では、光
伝送路を分岐信号数だけ用意する必要がある。本発明
は、分岐信号を光段で偏波多重し、一本の光伝送路によ
り基地局と集中基地局間の信号伝送をすることにより、
簡易かつ経済的な送受信ダイバーシチ方式を提供するこ
とを目的とする。In this basic configuration, it is necessary to prepare the optical transmission lines by the number of branch signals. The present invention, by polarization-multiplexing the branch signal in the optical stage, by performing signal transmission between the base station and the centralized base station by one optical transmission line,
An object is to provide a simple and economical transmission / reception diversity method.
【０００８】[0008]
【課題を解決するための手段】本発明の特徴は、基地局
において２アンテナで受信した２電気信号を電気／光変
換器で光信号に変換した後、それぞれの光信号を偏波多
重し、一本の光伝送路により集中基地局に伝送し、集中
基地局において光偏波分離器から出力される光信号をそ
れぞれ光／電気変換器で電気信号に変換し、それぞれの
電気信号を復調した後、判定器に入力し、各アンテナか
らの受信信号品質を比較し、最適なアンテナからの復調
ベースバンドを出力する。また、これと同じアンテナを
送信アンテナとして選択することを特徴とする。A feature of the present invention is that two electric signals received by two antennas in a base station are converted into optical signals by an electric / optical converter, and then each optical signal is polarization multiplexed. Transmitted to the toll base station through one optical transmission line, converted the optical signal output from the optical polarization demultiplexer in the toll base station into an electrical signal by the optical / electrical converter, and demodulated each electrical signal. After that, the signal is input to the determiner, the received signal quality from each antenna is compared, and the demodulated baseband from the optimum antenna is output. Further, it is characterized in that the same antenna as this is selected as a transmitting antenna.
【０００９】[0009]
【作用】本発明によれば、集中基地局で無線信号の復調
とアンテナ切替えを行なうため、基地局では復調器と信
号品質判定器およびスイッチが不要となり基地局の小型
化、簡易化が可能となる。さらに、２分岐信号を集中基
地局と基地局間において光段での偏波多重することによ
り、上り回線および下り回線においてそれぞれ一本の光
ファイバを省略することができ、より簡易かつ経済的な
ダイバーシチ送受信方式を提供することができる。According to the present invention, since the centralized base station demodulates a radio signal and switches the antenna, the base station does not require a demodulator, a signal quality judging device and a switch, and the base station can be downsized and simplified. Become. Furthermore, by polarization-multiplexing the two-branch signal between the centralized base station and the base station at the optical stage, it is possible to omit one optical fiber for each of the uplink and the downlink, which is simpler and more economical. A diversity transmission / reception system can be provided.
【００１０】[0010]
【実施例】以下図面を参照して本発明の実施例を説明す
る。図１は本発明の通信方式の実施例１の構成を示す図
であり、移動通信方式における基地局２と集中基地局１
との間の信号伝送を偏波面保存光ファイバ１２、２９で
伝送する構成で説明する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a first embodiment of a communication system of the present invention, in which a base station 2 and a centralized base station 1 in the mobile communication system are shown.
A description will be given of a configuration in which signal transmission between the optical fiber and the optical fiber is transmitted by the polarization-maintaining optical fibers 12 and 29.
【００１１】基地局２は、無線ゾーンの移動機端末との
間で無線伝送路を形成するアンテナ２０、２１、移動機
への送信信号と移動機からの受信信号を分離する送受分
離器１８、１９、受信信号を増幅する増幅器２２、２
３、増幅器２２、２３出力信号をそれぞれ光信号に変換
するための電気／光信号変換器２４、２５、光信号を偏
波に分波し片偏波を出力する光ポーラライザ２６、２
７、偏波を直交状態で合波する光偏波結合器２８、集中
基地局から伝送された偏波多重された光信号を２偏波に
分波する光偏波分離器１３、光偏波分離器１３から出力
される光信号を無線信号に変換する光／電気変換器１
４、１５、光／電気変換器１４、１５出力信号をそれぞ
れ増幅する増幅器１６、１７を具備する。The base station 2 has antennas 20 and 21 that form a wireless transmission path with a mobile terminal in a wireless zone, a transmission / reception separator 18 that separates a transmission signal to the mobile station and a reception signal from the mobile station, 19, amplifiers 22 for amplifying received signals, 2
3, amplifiers 22 and 23, electric / optical signal converters 24 and 25 for converting output signals into optical signals, and optical polarizers 26 and 2 for demultiplexing optical signals into polarized waves and outputting single polarized waves
7, an optical polarization coupler 28 that combines polarized waves in an orthogonal state, an optical polarization separator 13 that demultiplexes a polarization-multiplexed optical signal transmitted from a centralized base station into two polarizations, an optical polarization Optical / electrical converter 1 for converting an optical signal output from the separator 13 into a radio signal
4, 15 and optical / electrical converters 14, 15 are provided with amplifiers 16, 17 for amplifying output signals, respectively.
【００１２】集中基地局１は、変調器３出力信号を入力
する送信アンテナ切替えスイッチ４、送信アンテナ切替
えスイッチ４出力信号を入力する結合器５、６、結合器
５、６出力信号をそれぞれ入力し光信号に変換する電気
／光変換器７、８、電気／光変換器７、８出力信号をそ
れぞれ偏波に分波し片偏波を出力する光ポーラライザ
９、１０、光ポーラライザ９、１０から出力される２光
偏波信号を直交結合する光偏波結合器１１、基地局２か
らの光信号を偏波に分波する光偏波分離器３０、光偏波
分離器３０から出力される２光信号をそれぞれ無線信号
に変換する光／電気変換器３１、３２、光／電気変換器
３１、３２出力信号をそれぞれ入力する分配器３３、３
４、分配器３３、３４出力信号をそれぞれ入力する復調
器３５、３６、復調器３５、３６出力信号を入力するス
イッチ３８、復調器３５、３６出力信号を入力しスイッ
チ３８にアンテナ選択信号を入力する判定器３７を具備
する。The toll base station 1 inputs the transmitting antenna changeover switch 4 for inputting the output signal of the modulator 3, the couplers 5, 6 for inputting the output signal of the transmitting antenna changeover switch 4, and the output signals for the couplers 5, 6 respectively. From the electrical / optical converters 7 and 8 for converting to optical signals, and the optical polarisers 9 and 10 and optical polarisers 9 and 10 for respectively demultiplexing the output signals into polarized waves and outputting one polarization. Output from the optical polarization coupler 11 that orthogonally couples the two output optical polarization signals, the optical polarization splitter 30 that splits the optical signal from the base station 2 into polarized waves, and the optical polarization splitter 30. Optical / electrical converters 31, 32 for converting the two optical signals into radio signals, and distributors 33, 3 for receiving the output signals of the optical / electrical converters 31, 32 respectively
4, demodulators 35 and 36 for inputting the output signals of the distributors 33 and 34, a switch 38 for inputting the output signals of the demodulators 35 and 36, and an output signal of the demodulators 35 and 36, and an antenna selection signal to the switch 38 The determination device 37 is provided.
【００１３】基地局２では、下り回線において、アンテ
ナ２０、２１で受信した移動機端末からの無線信号はそ
れぞれ送受分離器１８、１９に入力された後、それぞれ
アンプ２２、２３に入力される。アンプ２２、２３出力
信号はそれぞれ電気／光変換器２４、２５に入力され
る。電気／光変換器２４、２５出力光信号は光ポーララ
イザ２６、２７に入力され片偏波として出力される。光
ポーラライザ２６、２７出力光信号は結合器２８で直交
偏波として合波される。該直交偏波は偏波面保存光ファ
イバ２９を介して集中基地局１に伝送される。In the base station 2, in the downlink, the radio signals from the mobile terminal received by the antennas 20 and 21 are input to the transmission / reception separators 18 and 19, respectively, and then to the amplifiers 22 and 23, respectively. The output signals of the amplifiers 22 and 23 are input to the electric / optical converters 24 and 25, respectively. The output optical signals of the electrical / optical converters 24 and 25 are input to the optical polarizers 26 and 27 and output as one polarized wave. Optical signals output from the optical polarizers 26 and 27 are combined by a coupler 28 as orthogonal polarized waves. The orthogonal polarization is transmitted to the toll base station 1 via the polarization-maintaining optical fiber 29.
【００１４】上り回線において、基地局１から偏波面保
存光ファイバ１２を介して伝送される光信号は光偏波分
離器１３に入力され２偏波に分波される。該２偏波はそ
れぞれ電気／光変換器１４、１５に入力され無線信号に
変換される。該無線信号はそれぞれアンプ１６、１７に
入力された後、それぞれ送受分離器１８、１９を経由し
て、それぞれアンテナ２０、２１に入力される。In the uplink, the optical signal transmitted from the base station 1 via the polarization-maintaining optical fiber 12 is input to the optical polarization demultiplexer 13 and demultiplexed into two polarized waves. The two polarized waves are input to the electric / optical converters 14 and 15 and converted into radio signals. The radio signals are input to amplifiers 16 and 17, respectively, and then are input to antennas 20 and 21 via transmission / reception separators 18 and 19, respectively.
【００１５】集中基地局１では、上り回線においては、
基地局２からの光信号を光偏波分離器３０により２偏波
に分波する。該２偏波はそれぞれ光／電気変換器３１、
３２に入力され無線信号に変換される。該無線信号はそ
れぞれ分配器３３、３４に入力された後、復調器３５、
３６に入力される。すなわちアンテナ２０および２１か
らの２分岐信号はそれぞれ復調器３５、３６により復調
される。判定器３７には復調器３５、３６からの復調信
号が入力され受信レベルの高いアンテナ（または復調器
３５、３６のベースバンド信号が入力され誤り率の低い
アンテナ、あるいは検波後のアイアパーチャの大きいア
ンテナ）が決定される。その結果をもとに復調器３５、
３６のどちらか一方が受信信号選択スイッチ３８により
選択され出力される。In the toll base station 1, in the uplink,
The optical signal from the base station 2 is demultiplexed into two polarized waves by the optical polarization splitter 30. The two polarized waves are respectively an optical / electrical converter 31,
It is input to 32 and converted into a radio signal. After the radio signals are input to the distributors 33 and 34, respectively, the demodulator 35,
36 is input. That is, the two-branch signals from the antennas 20 and 21 are demodulated by the demodulators 35 and 36, respectively. The demodulation signals from the demodulators 35 and 36 are input to the determiner 37, and an antenna having a high reception level (or a baseband signal of the demodulators 35 and 36 is input to an antenna having a low error rate or a large eye aperture after detection). Antenna) is determined. Based on the result, the demodulator 35,
Either one of 36 is selected by the reception signal selection switch 38 and output.
【００１６】下り回線においては、変調器３からの送信
信号（時分割多重されている）は前記判定器３７により
制御される送信アンテナ切替えスイッチ４を介して時分
割された各タイムスロットごとに選択され、結合器５、
６のどちらか一方に入力される。該結合器５、６出力は
それぞれ電気／光変換器７、８に入力され光信号に変換
される。該光信号は光ポーラライザ９、１０に入力され
偏波として出力される。該光ポーラライザ９、１０出力
光信号は光偏波結合器１１で直交偏波として合波され
る。該直交偏波は偏波面保存ファイバ１２を介して基地
局２に伝送される。In the downlink, the transmission signal (time-division multiplexed) from the modulator 3 is selected for each time slot time-divided via the transmission antenna changeover switch 4 controlled by the decision unit 37. And the coupler 5,
It is input to either one of 6. The outputs of the couplers 5 and 6 are input to the electric / optical converters 7 and 8 and converted into optical signals. The optical signal is input to the optical polarizers 9 and 10 and output as a polarized wave. The output signals of the optical polarizers 9 and 10 are combined by the optical polarization coupler 11 as orthogonal polarized waves. The orthogonal polarization is transmitted to the base station 2 via the polarization-maintaining fiber 12.
【００１７】図２は本発明の通信方式の実施例２の構成
を示す図である。偏波面保存光ファイバの代わりに通常
の光ファイバ３９、４３を用いるため、光／電気変換器
１４、１５および３１、３２の出力レベルをレベル検出
器４０、４１および４４、４５でモニタし、光／電気変
換器の出力レベルが最大となるように偏光面制御器４２
および４６で光偏波分離器１３および３０の検出偏波面
を制御する点が実施例１と異なる。FIG. 2 is a diagram showing the configuration of the second embodiment of the communication system of the present invention. Since the ordinary optical fibers 39 and 43 are used instead of the polarization-maintaining optical fibers, the output levels of the optical / electrical converters 14, 15 and 31, 32 are monitored by the level detectors 40, 41 and 44, 45, and / Polarization plane controller 42 so that the output level of the electrical converter is maximized
And 46 are different from the first embodiment in that the detected polarization planes of the optical polarization splitters 13 and 30 are controlled.
【００１８】[0018]
【発明の効果】以上説明したように、本発明はダイバー
シチ送受信方式において、集中基地局において移動機端
末からの受信信号の選択および移動機端末への送信アン
テナの選択を行ない、基地局の変復調機と信号品質判定
器が不要となるため、基地局の小型化、簡易化を図るこ
とができる利点を有する。さらに、ダイバーシチ用２分
岐信号を光段で偏波多重することにより、上り回線およ
び下り回線においてそれぞれ一本の光ファイバにより集
中基地局と基地局間でダイバーシチ送受信することがで
きるため簡易で経済的にも優れている。As described above, according to the present invention, in the diversity transmission / reception system, the centralized base station selects the reception signal from the mobile terminal and the transmission antenna to the mobile terminal, and the modulator / demodulator of the base station. Since there is no need for a signal quality judging device, there is an advantage that the base station can be downsized and simplified. Furthermore, by polarization-multiplexing the two branch signals for diversity in the optical stage, it is possible to perform diversity transmission / reception between the centralized base station and the base station by using one optical fiber in each of the uplink and downlink, which is simple and economical. Is also excellent.
【図１】本発明実施例１の構成図である。FIG. 1 is a configuration diagram of a first embodiment of the present invention.
【図２】本発明実施例２の構成図である。FIG. 2 is a configuration diagram of a second embodiment of the present invention.
【図３】従来の実施例の構成図である。FIG. 3 is a configuration diagram of a conventional example.
【図４】従来の別の構成図である。FIG. 4 is another conventional configuration diagram.
１ 集中基地局 ２，６１ 基地局 ３，５１ 変調器 ４，５２ 送信アンテナ切替えスイッチ ５，６，１１，２８ 結合器 ７，８，２４，２５ 電気／光変換器 ９，１０，１３，２６，２７，３０ 光ポーラライザ １２，２９ 偏波面保存光ファイバ １４，１５，３１，３２ 光／電気変換器 １６，１７，２２，２３ 増幅器 １８，１９，４９，５０ 送受分離器 ２０，２１，４７，４８ 送受信アンテナ ３３，３４ 分配器 ３５，３６，５５，５６ 復調器 ３７ 判定器 ３８，５８ 受信信号選択スイッチ ３９，４３ 光ファイバ ４０，４１，４４，４５，５７ レベル検出器 ４２，４６ 偏波面制御器 ５９，６０ 移動機端末 1 Centralized base station 2,61 Base station 3,51 Modulator 4,52 Transmission antenna changeover switch 5,6,11,28 Combiner 7,8,24,25 Electric / optical converter 9,10,13,26, 27,30 Optical polarizer 12,29 Polarization-maintaining optical fiber 14,15,31,32 Optical / electrical converter 16,17,22,23 Amplifier 18,19,49,50 Transmitter / receiver separator 20,21,47,48 Transmitter / receiver antenna 33,34 Distributor 35,36,55,56 Demodulator 37 Determinator 38,58 Received signal selection switch 39,43 Optical fiber 40,41,44,45,57 Level detector 42,46 Polarization plane controller 59,60 Mobile terminal
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 14/06 Continuation of front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location H04J 14/06
Claims (1)
て接続され相互通信を行う通信方式であって、集中基地
局と基地局間を光伝送路で接続し、かつ基地局で複数の
アンテナを使用するダイバーシチ送受信方式において、 上記基地局は、上記の移動機端末からの無線チャネル信
号を２つのアンテナで受信し、増幅された複数の受信信
号を入力するそれぞれの電気／光変換器と光ポーラライ
ザ、およびその出力を光多重化する光偏波結合器を具備
し、光信号を光伝送路で集中基地局へ伝送する手段を備
え、 集中基地局には、前記光信号を直交偏波に分波する光偏
波分離器と、光信号を電気信号に変換する光／電気変換
器と、最も高品質な受信信号を選択する信号品質判定器
を具備し、最も受信品質の高い信号を選択する手段を備
え、 集中基地局から移動機端末への送信のために集中基地局
は無線チャネル信号を２分岐選択する送信アンテナ切替
えスイッチと、該２分岐信号をそれぞれ光信号に変換す
る電気／光変換器と光ポーラライザ、およびその出力を
光多重化する光偏波結合器を具備し、該光信号を光伝送
路により基地局へ伝送する手段を備え、 基地局において前期光信号を光偏波分離器により直交す
る複数の偏波に分離した後、それぞれの光信号を電気信
号に変換し、前記信号品質判定器の出力に従って前記送
信アンテナ切替えスイッチにより送信アンテナを選択す
ることを特徴とするダイバーシチ送受信方式。1. A communication system in which a centralized base station and a mobile terminal are connected to each other through a base station to perform mutual communication, wherein the centralized base station and the base station are connected by an optical transmission line, and a plurality of base stations are connected. In the diversity transmission / reception system using the antennas, the base station receives the radio channel signals from the mobile terminal with the two antennas, and each of the electric / optical converters receives the amplified reception signals. And an optical polariser, and an optical polarization coupler that multiplexes the output of the optical polariser, and means for transmitting the optical signal to the toll base station through an optical transmission line. The signal with the highest reception quality is equipped with an optical polarization demultiplexer that splits the signal into waves, an optical / electrical converter that converts the optical signal into an electrical signal, and a signal quality judgment device that selects the highest quality received signal. Concentrated base with means to select The centralized base station selects a transmission antenna changeover switch for selecting a radio channel signal from two branches for transmission from the station to the mobile terminal, an electric / optical converter and an optical polarizer for converting each of the two branch signals into an optical signal, and An optical polarization coupler for optically multiplexing the output is provided, and means for transmitting the optical signal to the base station through an optical transmission line is provided. In the base station, a plurality of optical signals are orthogonalized by an optical polarization splitter. A diversity transmission / reception system characterized by converting each optical signal into an electric signal after separating into polarized waves, and selecting a transmission antenna by the transmission antenna changeover switch according to the output of the signal quality judging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4147964A JPH05327576A (en) | 1992-05-15 | 1992-05-15 | Diversity transmission/reception system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4147964A JPH05327576A (en) | 1992-05-15 | 1992-05-15 | Diversity transmission/reception system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05327576A true JPH05327576A (en) | 1993-12-10 |
Family
ID=15442077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4147964A Withdrawn JPH05327576A (en) | 1992-05-15 | 1992-05-15 | Diversity transmission/reception system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05327576A (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0983438A (en) * | 1995-09-12 | 1997-03-28 | Nec Corp | Cableless interface |
| JPH10275954A (en) * | 1997-03-07 | 1998-10-13 | Lucent Technol Inc | Optical system |
| KR20000062871A (en) * | 1999-03-16 | 2000-10-25 | 윤종용 | Dual carrier, three-sector configuration for a cdma transmitter/receiver |
| US6744823B1 (en) | 1998-12-24 | 2004-06-01 | Sumitomo Electric Industries, Ltd. | Communication system between road and vehicle |
| WO2008076432A1 (en) * | 2006-12-19 | 2008-06-26 | Mobileaccess Networks Ltd. | Distributed antenna system for mimo technologies |
| JP2010178091A (en) * | 2009-01-29 | 2010-08-12 | Fujitsu Ltd | Polarization multiplexing optical receiver, polarization multiplexing optical reception circuit, and polarization multiplexing optical transmission system |
| US8111959B2 (en) | 2008-07-30 | 2012-02-07 | Corning Mobileaccess Ltd | Method and system for coupling multimode optical fiber to an optical detector |
| US8121646B2 (en) | 2007-01-18 | 2012-02-21 | Corning Mobileaccess Ltd | Method and system for equalizing cable losses in a distributed antenna system |
| US8184681B2 (en) | 2006-01-11 | 2012-05-22 | Corning Mobileaccess Ltd | Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting |
| US8195224B2 (en) | 2008-05-13 | 2012-06-05 | Corning Mobileaccess Ltd | Multiple data services over a distributed antenna system |
| US8325693B2 (en) | 2004-05-06 | 2012-12-04 | Corning Mobileaccess Ltd | System and method for carrying a wireless based signal over wiring |
| US8731411B2 (en) | 2010-04-07 | 2014-05-20 | Fujitsu Limited | Polarization fluctuation compensation device and optical communication system |
| US9026036B2 (en) | 2005-02-28 | 2015-05-05 | Corning Optical Communications Wireless Ltd. | Method and system for integrating an RF module into a digital network access point |
| US9258052B2 (en) | 2012-03-30 | 2016-02-09 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9276656B2 (en) | 2007-02-19 | 2016-03-01 | Corning Optical Communications Wireless Ltd | Method and system for improving uplink performance |
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| US9813229B2 (en) | 2007-10-22 | 2017-11-07 | Corning Optical Communications Wireless Ltd | Communication system using low bandwidth wires |
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-
1992
- 1992-05-15 JP JP4147964A patent/JPH05327576A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0983438A (en) * | 1995-09-12 | 1997-03-28 | Nec Corp | Cableless interface |
| JPH10275954A (en) * | 1997-03-07 | 1998-10-13 | Lucent Technol Inc | Optical system |
| US7286611B2 (en) | 1998-12-24 | 2007-10-23 | Sumitomo Electric Industries, Ltd. | Roadway communication system |
| US7286610B2 (en) | 1998-12-24 | 2007-10-23 | Sumitomo Electric Industries, Ltd. | Roadway communication system |
| US6744823B1 (en) | 1998-12-24 | 2004-06-01 | Sumitomo Electric Industries, Ltd. | Communication system between road and vehicle |
| KR20000062871A (en) * | 1999-03-16 | 2000-10-25 | 윤종용 | Dual carrier, three-sector configuration for a cdma transmitter/receiver |
| US8325693B2 (en) | 2004-05-06 | 2012-12-04 | Corning Mobileaccess Ltd | System and method for carrying a wireless based signal over wiring |
| US9026036B2 (en) | 2005-02-28 | 2015-05-05 | Corning Optical Communications Wireless Ltd. | Method and system for integrating an RF module into a digital network access point |
| US8184681B2 (en) | 2006-01-11 | 2012-05-22 | Corning Mobileaccess Ltd | Apparatus and method for frequency shifting of a wireless signal and systems using frequency shifting |
| US9461719B2 (en) | 2006-12-19 | 2016-10-04 | Corning Optical Communications Wirless Ltd | Distributed antenna system for MIMO technologies |
| US9130613B2 (en) | 2006-12-19 | 2015-09-08 | Corning Optical Communications Wireless Ltd | Distributed antenna system for MIMO technologies |
| WO2008076432A1 (en) * | 2006-12-19 | 2008-06-26 | Mobileaccess Networks Ltd. | Distributed antenna system for mimo technologies |
| US9432095B2 (en) | 2006-12-19 | 2016-08-30 | Corning Optical Communications Wireless Ltd | Distributed antenna system for MIMO technologies |
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| US9312938B2 (en) | 2007-02-19 | 2016-04-12 | Corning Optical Communications Wireless Ltd | Method and system for improving uplink performance |
| US9276656B2 (en) | 2007-02-19 | 2016-03-01 | Corning Optical Communications Wireless Ltd | Method and system for improving uplink performance |
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| US8195224B2 (en) | 2008-05-13 | 2012-06-05 | Corning Mobileaccess Ltd | Multiple data services over a distributed antenna system |
| US8111959B2 (en) | 2008-07-30 | 2012-02-07 | Corning Mobileaccess Ltd | Method and system for coupling multimode optical fiber to an optical detector |
| US8249466B2 (en) | 2009-01-29 | 2012-08-21 | Fujitsu Limited | Polarization multiplexing optical receiver and polarization multiplexing optical transmission system |
| JP2010178091A (en) * | 2009-01-29 | 2010-08-12 | Fujitsu Ltd | Polarization multiplexing optical receiver, polarization multiplexing optical reception circuit, and polarization multiplexing optical transmission system |
| US8731411B2 (en) | 2010-04-07 | 2014-05-20 | Fujitsu Limited | Polarization fluctuation compensation device and optical communication system |
| US9948329B2 (en) | 2012-03-23 | 2018-04-17 | Corning Optical Communications Wireless, LTD | Radio-frequency integrated circuit (RFIC) chip(s) for providing distributed antenna system functionalities, and related components, systems, and methods |
| US9258052B2 (en) | 2012-03-30 | 2016-02-09 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9813127B2 (en) | 2012-03-30 | 2017-11-07 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9531452B2 (en) | 2012-11-29 | 2016-12-27 | Corning Optical Communications LLC | Hybrid intra-cell / inter-cell remote unit antenna bonding in multiple-input, multiple-output (MIMO) distributed antenna systems (DASs) |
| US9525472B2 (en) | 2014-07-30 | 2016-12-20 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9929786B2 (en) | 2014-07-30 | 2018-03-27 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US10256879B2 (en) | 2014-07-30 | 2019-04-09 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
| US9729267B2 (en) | 2014-12-11 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting |
| US10135561B2 (en) | 2014-12-11 | 2018-11-20 | Corning Optical Communications Wireless Ltd | Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting |
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