JPH05327576A - Diversity transmission/reception system - Google Patents

Diversity transmission/reception system

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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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Japan
Prior art keywords
optical
base station
signal
polarization
centralized
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JP4147964A
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Japanese (ja)
Inventor
Ryutaro Omoto
Hiroyuki Otsuka
裕幸 大塚
隆太郎 大本
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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Priority to JP4147964A priority Critical patent/JPH05327576A/en
Publication of JPH05327576A publication Critical patent/JPH05327576A/en
Application status is Withdrawn legal-status Critical

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Abstract

PURPOSE: To reduce the number of optical fiber transmission lines between a base station and a centralized base station in the system where the centralized base station performs the centralized control of transmission/reception diversity of the base station in mobile communication.
CONSTITUTION: A base station 2 converts reception signals of two antennas 20 and 21 to optical signals and multiplexes these outputs by an optical polarized wave coupler 28 and transmits the result to a centralized base station by one optical fiber 29. This station 29 separates the reception optical signal into polarized waves and converts them to electric signals and demodulates them and selects one of them having a higher signal quality by a discriminator 37. The output of the discriminator 37 is sent to a transmission antenna changeover switch 4 to switch the transmission antennas in the base station. The signal from the centralized base station 1 to the base station 2 is subjected to optical polarized wave multiplexing and is transmitted through one optical fiber 12.
COPYRIGHT: (C)1993,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【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 The present invention, through the base station, relates to a mobile communication method for performing mutual communication between the mobile terminal and the centralized base station, the antenna of the plurality (e.g., two) in the particular base station switching relates transceiver diversity method for performing 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。 BACKGROUND OF THE INVENTION Conventionally, in the base station demodulates the radio signal received by two antennas at different demodulators, after comparing the received signal quality of each antenna, diversity reception is all to select the optimum demodulator output It came carried out by the base station.

【0003】図3は従来の実施例を示すブロック図である。 [0003] FIG. 3 is a block diagram showing a conventional example. 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。 After the audio baseband signals transmitted from the base station 61 in the switching center is converted into a radio signal is input to the modulator 51, switch 52, moving from the antenna 47 or 48 via the transmit-receive splitter 49, 50 machine terminal 59 or 60 waves is emitted. 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。 Received signal from the mobile phone terminal 59 and 60 via the receiver 53 and 54 are input to the demodulator 55 and 56, to determine the carrier level from the receiver by the level detector 57, the level by the reception signal selection switch 58 selecting a high demodulator output of.

【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、 However, in order to meet increasing mobile number of terminals, for the number of base stations is increased when reducing the radio zone,
基地局の小型化、簡易化が必要である。 Miniaturization of the base station, it is necessary to simplify.

【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。 To solve this problem, transmission and reception diversity scheme for transmitting and receiving diversity control in a centralized base station can be considered. 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。 As the basic configuration of this type, configuration using the optical transmission path can be considered separately for each diversity branch signal. 図4に送受信ダイバーシチの基本構成を示す。 It shows the basic structure of a transmitting and receiving diversity in FIG.
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。 The optical fiber in this configuration the uplink, the downlink two by two, respectively, it is necessary to sum 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 [0006] Incidentally, in FIG. 4, 1 is centralized base station, 2 base station, 3 modulator, the transmit antenna switch 4, 5 and 6 coupler, 7 and 8 and 24 and 25 electrical / optical converter, 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 4 and 15 and 31 and 32 optical / electrical converter, 16 and 17 and 22 and 23 amplifiers, 18 and 19 transmit-receive splitter, 20 and 21 antenna, 33 and 34 distributor, 35 and 36 demodulate vessel, 37 decider, the 38 reception signal selection switch 3
9と61と43と62は光ファイバである。 9 and 61 and 43 and 62 is an optical fiber.

【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。 BRIEF Problem to be Solved] In this basic configuration, it is necessary to prepare an optical transmission path only branch signal number. 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、 The present invention is polarization multiplexed weigh the branch signals by the optical stage, by the signal transmission between the base station by a single optical transmission path of a centralized base station,
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。 And to provide a simple and economical transceiver diversity system.

【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。 Feature of the present invention, in order to solve the problems] After converting the optical signals to second electrical signals received by two antennas in an electric / optical converter in the base station, the polarization multiplexed weigh the respective optical signals, transmitted to a centralized base station by an optical transmission path of one, the optical signal output from the optical polarization splitter into an electric signal at each optical / electrical converter in a centralized base station, and demodulates the respective electrical signals after, enter into the determination unit compares received signal quality from each antenna, and outputs the demodulated baseband from optimum antenna. 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。 Further, and selects the same antenna as the as the 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。 According to the present invention, for switching the antenna and demodulation of the radio signals in a centralized base station, the miniaturization of the base station demodulator and the signal quality judging unit and the switch is not required base station, enables simplification Become. 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。 Furthermore, by polarization multiplexing of the optical stages between the 2 branch signal centralized base station and a base station, each can be omitted one optical fiber in the uplink and downlink, more simple and economical it is possible to provide a diversity reception scheme.

【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。 EXAMPLES Referring to the drawings illustrating the embodiments of the present invention. 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 Figure 1 is a diagram showing a configuration of a first embodiment of a communication method of the present invention, intensive and base station 2 in the mobile communication system base station 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。 The signal transmission between the described arrangement for transmitting by the polarization maintaining optical fiber 12,29.

【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 [0011] The base station 2 includes an antenna 20, 21 to form a radio transmission path between the mobile terminal of a wireless zone, transmit-receive splitter 18 which separates the received signal from the mobile station and the transmission signal to the mobile station, 19, the amplifier amplifies the received signal 22, 24, 32
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 3, the electrical / optical signal converter 24 for converting the amplifier 22 and 23 output signals to respective optical signals, an optical polarizer 26,2 for outputting an optical signal demultiplexed to the polarization Katahen wave
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 7, optical polarization coupler 28, optical polarization splitter 13 demultiplexes the optical signals polarization multiplexed transmitted from the centralized base station 2 polarization multiplexing the polarization in orthogonal states, optical polarization light converting an optical signal output from the separator 13 into a wireless signal / electrical converter 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。 4, 15 comprises a light / electric converter 14, 15 amplifiers 16 and 17 output signals respectively amplify.

【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 [0012] centralized base station 1, the modulator 3 transmitting antenna changeover switch 4 for receiving the output signal, the combiner 5 and 6 to enter the transmit antenna changeover switch 4 output signals, combiner 5,6 output signal respectively input electrical / optical converters 7 and 8 which converts the optical signal, an electrical / optical converters 7 and 8 demultiplexes the output signal to each polarized light polarizer 9 and 10 for outputting a Katahen waves, the optical polarizer 9,10 optical polarization splitter 30 demultiplexes optical polarization coupler 11 orthogonal combine two optical polarization signal output, an optical signal from the base station 2 to the polarization is output from the optical polarization splitter 30 2 optical / electrical converter 31 and 32 the optical signal respectively converted to a radio signal, an optical / electrical converter 31 divider output signal respectively input 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。 4, demodulator 35 and 36 to enter the distributor 33 and 34 output signals, respectively, switch 38 for inputting a demodulator 35 output signal, the input of the antenna selection signal to the switch 38 by entering the demodulator 35 output signal It comprises a decision unit 37 for.

【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。 [0013] At base station 2, the downlink, and the wireless signal from the mobile terminal received by antenna 20 and 21 input to each transmit-receive splitter 18 and 19, are input to respective amplifiers 22 and 23. 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。 Amplifier 22 and 23 output signals are input to the electric / optical converter 24, 25. 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。 Electrical / optical converter 24 and 25 output optical signal is output is input to the optical polarizer 26, 27 as Katahen wave. 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。 Light polarizer 26 and 27 output optical signals are multiplexed as an orthogonal polarized wave combiner 28. 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。 The orthogonal polarization are transmitted to the centralized 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。 [0014] In the uplink, an optical signal transmitted through the polarization-maintaining optical fiber 12 from the base station 1 is branched into 2 polarization is input to the optical polarization splitter 13. 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。 The second polarization is converted into are inputted to the electric / optical converter 14, 15 a radio signal. 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。 After wireless signal input to each amplifier 16 and 17, respectively via the transmit-receive splitter 18 and 19, it is input to the respective antennas 20, 21.

【0015】集中基地局1では、上り回線においては、 [0015] In the centralized base station 1, in the uplink,
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。 The optical signal from the base station 2 by optical polarization splitter 30 demultiplexes the 2 polarization. 該2偏波はそれぞれ光/電気変換器31、 Each said two polarization optical / electrical converter 31,
32に入力され無線信号に変換される。 32 is inputted and converted to a radio signal. 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、 After wireless signal input to each distributor 33 and 34, a demodulator 35,
36に入力される。 Is input to the 36. 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。 That bifurcated signal from the antenna 20 and 21 are demodulated by the demodulators 35 and 36. 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。 Determiner 37 having a high reception level is input demodulated signal from the demodulator 35 to the antenna (or low baseband signal is input error rate of the demodulator 35, 36 antenna or greater eye aperture after detection, antenna) is determined. その結果をもとに復調器35、 Demodulator 35 based on the result,
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。 Either of 36 is selected by the reception signal selection switch 38 is 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、 [0016] In downlink, selects for each time slot transmitted signal (which is time-division multiplexing) is divided at through the selection switch 4 transmit antennas controlled by the determination unit 37 from the modulator 3 is, coupler 5,
6のどちらか一方に入力される。 6 is input either to one of the. 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。 The coupler 5 and 6 output is converted into are inputted to the electric / optical converters 7 and 8 an optical signal. 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。 Optical signal is outputted as a polarization is input to the optical polarizer 9,10. 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。 Optical polarizer 9,10 output optical signals are multiplexed as an orthogonal polarized wave optical polarization coupler 11. 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。 The orthogonal polarization are transmitted to the base station 2 via a 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。 [0017] FIG. 2 is a diagram showing a configuration of a second embodiment of the communication method of the present invention. 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 Since using conventional optical fibers 39 and 43 instead of the polarization-maintaining optical fiber, and monitoring the output level of the optical / electrical converter 14, 15 and 31, 32 at the level detectors 40, 41 and 44, light / so that the output level of the electric transducer is maximum polarization plane controller 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。 And that controls the detection polarization plane of light polarization separator 13 and 30 at 46 is different from example 1.

【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。 As described in the foregoing, the present invention is in diversity receiving mode, performs selection of the transmission antennas to the selection and mobile terminal of the received signal from the mobile terminal in a centralized base station, the base station modem machine since the signal quality determiner becomes unnecessary and, with the miniaturization of the base station, the advantage of can be simplified. 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。 Furthermore, by polarization multiplexing two branch signal diversity in the light stage, economical simplified because it is possible to diversity transmission and reception between a centralized base station and a base station by a single optical fiber, respectively, in uplink and downlink also it has excellent.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明実施例1の構成図である。 1 is a configuration diagram of the present invention Example 1.

【図2】本発明実施例2の構成図である。 2 is a block diagram of the present invention Example 2.

【図3】従来の実施例の構成図である。 3 is a block diagram of a conventional example.

【図4】従来の別の構成図である。 FIG. 4 is another block diagram of a conventional.

【符号の説明】 DESCRIPTION OF SYMBOLS

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 transmitting antenna changeover switch 5,6,11,28 combiner 7,8,24,25 electrical / optical converter 9,10,13,26, 27, 30 light polarizer 12,29 polarization-maintaining optical fiber 14,15,31,32 optical / electrical converter 16,17,22,23 amplifier 18,19,49,50 receive splitter 20,21,47,48 reception antenna 33 divider 35, 36, 55, demodulator 37 decider 38, 58 receive the signal selection switch 39, 43 optical fiber 40,41,44,45,57 level detector 42, 46 polarization controller 59 and 60 the mobile station 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 Front page continued (51) Int.Cl. 5 in identification symbol Agency Docket No. FI art display portion H04J 14/06

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 集中基地局と移動機端末が基地局を介し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 1. A communication method which the mobile phone terminal and the centralized base station communicate with each other are connected via a base station, between centralized base station and a base station connected by the optical transmission path, and a plurality at the base station in diversity reception scheme using an antenna, the base station, a radio channel signal from the mobile phone terminal and received by the two antennas, each of the electrical / optical converter for inputting a plurality of received signal amplified a light polarizer, and its output comprises an optical polarization coupler for optical multiplexing, comprising means for transmitting to the centralized base station optical signal in an optical transmission path, the centralized base station, orthogonal polarization of the optical signal and optical polarization separator for demultiplexing the wave, and the optical / electrical converter for converting an optical signal into an electrical signal, comprising a signal quality determiner for selecting the highest quality received signal, the highest reception quality signal comprising means for selecting, centralized base 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。 Centralized base station for transmission to the mobile terminal from the station and transmitting antenna changeover switch for 2 branches selecting a wireless channel signal, electrical / optical converter for converting said second branch signal to a respective optical signal and an optical polarizer, and It comprises a light polarization coupler for optically multiplexing the output, comprising means for transmitting to the base station the optical signal by the optical transmission line, a plurality of orthogonal by optical polarization separator year optical signal at the base station after separating the polarization, and converts each optical signal into an electrical signal, the diversity reception scheme and selects a transmission antenna by the transmitting antenna changeover switch in accordance with an output of said signal quality determiner.
JP4147964A 1992-05-15 1992-05-15 Diversity transmission/reception system Withdrawn JPH05327576A (en)

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JPH05327576A true JPH05327576A (en) 1993-12-10

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JPH0983438A (en) * 1995-09-12 1997-03-28 Nec Corp Cableless interface
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
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
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)
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
US9813229B2 (en) 2007-10-22 2017-11-07 Corning Optical Communications Wireless Ltd Communication system using low bandwidth wires
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

Cited By (30)

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Publication number Priority date Publication date Assignee Title
JPH0983438A (en) * 1995-09-12 1997-03-28 Nec Corp Cableless interface
US6744823B1 (en) 1998-12-24 2004-06-01 Sumitomo Electric Industries, Ltd. Communication system between road and vehicle
US7286610B2 (en) 1998-12-24 2007-10-23 Sumitomo Electric Industries, Ltd. Roadway communication system
US7286611B2 (en) 1998-12-24 2007-10-23 Sumitomo Electric Industries, Ltd. Roadway communication system
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
US9130613B2 (en) 2006-12-19 2015-09-08 Corning Optical Communications Wireless Ltd Distributed antenna system for MIMO technologies
US9461719B2 (en) 2006-12-19 2016-10-04 Corning Optical Communications Wirless 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
WO2008076432A1 (en) * 2006-12-19 2008-06-26 Mobileaccess Networks Ltd. Distributed antenna system for mimo technologies
US8121646B2 (en) 2007-01-18 2012-02-21 Corning Mobileaccess Ltd Method and system for equalizing cable losses in a distributed antenna system
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
US9813229B2 (en) 2007-10-22 2017-11-07 Corning Optical Communications Wireless Ltd Communication system using low bandwidth wires
US9246557B2 (en) 2007-12-17 2016-01-26 Corning Optical Communications Wireless Ltd Multiple data services over a distributed antenna system
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
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
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
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)
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
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
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
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
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

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