JPH0616596B2 - Mobile radio communication diversity system - Google Patents
Mobile radio communication diversity systemInfo
- Publication number
- JPH0616596B2 JPH0616596B2 JP58240478A JP24047883A JPH0616596B2 JP H0616596 B2 JPH0616596 B2 JP H0616596B2 JP 58240478 A JP58240478 A JP 58240478A JP 24047883 A JP24047883 A JP 24047883A JP H0616596 B2 JPH0616596 B2 JP H0616596B2
- Authority
- JP
- Japan
- Prior art keywords
- reception
- antennas
- transmission
- circuit
- mobile radio
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はＶＨＦ以上の周波数を用いた陸上移動無線通
信におけるデータ伝送の信号信頼度を向上するためのダ
イバシティ技術に関する。TECHNICAL FIELD The present invention relates to a diversity technique for improving the signal reliability of data transmission in land mobile radio communication using frequencies of VHF and above.
従来の単信方式（同一周波数を送受交互に用いる無線通
信方式）の陸上移動無線方式では音声の伝送が主であっ
たが、近年情報化の進展に伴い、移動中の車からのデー
タ伝送やファクシミリ伝送に対するニーズも高まってき
ており、一部には情報処理用データ端末を移動無線通信
システムに接続した情報処理システムも出現してきてい
る。しかし従来の陸上移動無線通信方式の商品レベルの
技術ではいわゆるスループット（Through put）で高々3
00 bps のデータ伝送の能力しかなく、満足に高速デー
タ伝送やファクシミリ伝送を行うことはできない。The land mobile radio system, which is a conventional simplex system (a radio communication system that alternately transmits and receives the same frequency), mainly transmits voice, but with the progress of computerization in recent years, data transmission from a moving vehicle and The need for facsimile transmission is also increasing, and in part, an information processing system in which an information processing data terminal is connected to a mobile wireless communication system has also appeared. However, conventional land mobile radio communication system product-level technology has a so-called throughput (Through put) of at most 3
Since it has a data transmission capacity of 00 bps, it cannot perform satisfactory high-speed data transmission and facsimile transmission.
すなわち現在の電波法のもとに、音声伝送を主目的とす
る単式方式の陸上移動無線システムにおいて、従来には
なかった高信頼度の高速度データ通信を達成し、大量の
データを短時間に送ることができるものが要望されてい
る。That is, based on the current Radio Law, in a single-type land mobile radio system whose main purpose is voice transmission, we have achieved unprecedented high-reliability high-speed data communication and can transfer a large amount of data in a short time. What can be sent is desired.
第１図は従来の単信方式の陸上移動無線通信方式の構成
図であり、第２図は第１図中の移動局無線送受信装置
（以下移動無線装置と略す）１のブロック構成詳細図で
ある。まず、移動局Ａ内の移動無線装置１と基地局Ｂの
基地局無線送受信装置（以下基地無線装置と略す）５１
とがそれぞれのアンテナ２とアンテナ52を通じて交信、
通話するとともに上記移動局Ａ内のデータ・ターミナル
３をインタフェース回路４を介して、データ処理システ
ム53に結合してデータ伝送を行うことも可能である。使
用する電波の形式はＶＨＦ、ＵＨＦ帯の25 kHzチャンネ
ル・セパレーション、音声帯域幅0.03〜3 kHz 、位相変
調方式が一例としてあげられる。アンテナ２は第２図に
おける送受共用回路106を介して制御部103にて制御され
る送信部101、受信部102に結合される。104はスピー
カ、105はマイクである。FIG. 1 is a block diagram of a conventional simplex land mobile radio communication system, and FIG. 2 is a detailed block diagram of a mobile station radio transmitter-receiver (hereinafter abbreviated as mobile radio device) 1 in FIG. is there. First, the mobile radio device 1 in the mobile station A and the base station radio transmission / reception device of the base station B (hereinafter abbreviated as base radio device) 51.
Communicate with each other through antenna 2 and antenna 52,
It is also possible to connect the data terminal 3 in the mobile station A via the interface circuit 4 to the data processing system 53 for data transmission while making a call. The radio wave format used is, for example, 25 kHz channel separation in VHF or UHF band, voice bandwidth 0.03 to 3 kHz, and phase modulation method. The antenna 2 is coupled to the transmission unit 101 and the reception unit 102 controlled by the control unit 103 via the transmission / reception common circuit 106 in FIG. 104 is a speaker and 105 is a microphone.
しかしこのような陸上移動無線通信方式では電波のマル
チパス伝搬に起因して、走行する移動無線装置１は高速
で受信電界が変動するフェーディングの影響を強く受け
るので、高速でのデータ伝送は困難になる。However, in such a land mobile radio communication system, the traveling mobile radio apparatus 1 is strongly affected by fading in which the received electric field fluctuates at high speed due to multipath propagation of radio waves, so that high-speed data transmission is difficult. become.
第３図は上記マルチパスに起因するフェーディングの影
響を逃れるためスペースダイバシティを採用した従来方
式例である。上記スペースダイバシティを行うために移
動局Ａは２つの受信ルートを備えている。すなわちほぼ
無相関の電波伝播路を経由した電波は、アンテナ2a、お
よび2bで受信された後、それぞれ送受共用回路106a、10
6bを経て受信部102a、102bにて復調され、次に続いて接
続される切替回路109にて、上記受信部に接続された比
較回路108の出力に応じて受信電界の高い受信ルートが
選択されたデータターミナル３に接続される。この比較
回路108は受信部102a、102bからの例えば受信機雑音の
レベルを比較して、そのレベルの低い方の受信ルートを
選択する。このようにすることで、フェーディングによ
る受信データの劣化は大幅に改善される。FIG. 3 shows an example of a conventional system that employs space diversity in order to escape the influence of fading caused by the multipath. The mobile station A has two reception routes in order to perform the space diversity. That is, the radio waves that have passed through the almost uncorrelated radio wave propagation paths are received by the antennas 2a and 2b, and then the transmission / reception common circuits 106a and
6b is demodulated by the receiving units 102a and 102b, and then the switching circuit 109 connected subsequently selects a receiving route having a high receiving electric field according to the output of the comparison circuit 108 connected to the receiving unit. Connected to the data terminal 3. The comparison circuit 108 compares the levels of, for example, receiver noises from the receiving units 102a and 102b, and selects the receiving route having the lower level. By doing so, the deterioration of received data due to fading is greatly improved.
しかしこの従来方式では受信部が２台必要でコスト高と
なるほか大型となり実装スペース上からも望ましくない
という欠点があった。However, this conventional method has a drawback in that it requires two receivers, resulting in a high cost and a large size, which is not desirable in terms of mounting space.
本発明は上記従来例の欠点を解決するものであり、受信
部は１台で間に合うようにしてコストが安く、実装スペ
ースも小さくて済むようにして、移動局内スペースを有
効に活用できるようにすることを目的とする。The present invention solves the above-mentioned drawbacks of the conventional example, and it is possible to effectively use the space in the mobile station by making it possible to use only one receiver in time so that the cost is low and the mounting space is small. To aim.
本発明は送受共用回路を備えた単信方式の移動無線送受
信装置と、複数のアンテナを切替えて行う空間ダイバシ
ティ方式のアンテナ系から構成されるシステムにおい
て、受信時には上記送受信装置が高速で移動するために
生ずるフェーディングによる受信電波の変動に応じて、
上記複数のアンテナのうちの１つのアンテナを切替回路
にて選択して空間ダイバシティを行い、送信時には上記
複数のアンテナのうちの常に特定のアンテナを選択して
送信することを特徴とする。The present invention is a system composed of a simplex type mobile radio transmitter / receiver equipped with a transmission / reception shared circuit and a space diversity type antenna system for switching a plurality of antennas, because the transmitter / receiver moves at high speed during reception. Depending on the fluctuation of the received radio wave due to fading
One of the plurality of antennas is selected by a switching circuit to perform space diversity, and at the time of transmission, a specific antenna is always selected and transmitted from the plurality of antennas.
すなわち、送受共用回路を備えた単信方式の移動局無線
送受信装置と、複数のアンテナを切替えて行う空間ダイ
バシティ方式のアンテナ系から構成されるシステムにお
いて、受信時には上記複数のアンテナのうちの一つのア
ンテナを選択するように上記切替回路にて高速に切替え
て受信装置に接続して空間ダイバシティを行い、送信時
には上記複数のアンテナのうちの常に特定のアンテナを
選択して送信することを特徴とする。That is, in a system including a simplex mobile station radio transmitter / receiver equipped with a transmission / reception shared circuit and a space diversity type antenna system that switches a plurality of antennas, one of the plurality of antennas is received at the time of reception. It is characterized in that the switching circuit is switched at high speed so as to select an antenna and connected to a receiving device to perform space diversity, and at the time of transmission, a specific antenna is always selected and transmitted from the plurality of antennas. .
以下図面を参照して本発明の実施例を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第４図は、本発明第一実施例のダイバシティ受信方式の
陸上無線通信方式の構成詳細図である。アンテナ2aおよ
び2bは切替回路109の入力側に接続されている。切替回
路109の出力は送受共用回路106に入力する。この送受共
用回路106の２本の出力の１本は送信部101に、他の１本
は受信部102に入力する。上記送信部101はと受信部102
には制御部103が結合されている。また、上記受信部102
からの受信電波検出出力と制御部103からの制御信号出
力は前記切替回路109内の制御回路に入力されている。FIG. 4 is a detailed configuration diagram of a land wireless communication system of the diversity receiving system of the first embodiment of the present invention. The antennas 2a and 2b are connected to the input side of the switching circuit 109. The output of the switching circuit 109 is input to the transmission / reception common circuit 106. One of the two outputs of the transmission / reception common circuit 106 is input to the transmission unit 101, and the other one is input to the reception unit 102. The transmitter 101 and the receiver 102
A control unit 103 is coupled to the. In addition, the receiving unit 102
The received radio wave detection output from the control circuit 103 and the control signal output from the control unit 103 are input to the control circuit in the switching circuit 109.
また、受信部102の出力はスピーカ104に導かれるととも
に、データターミナル３に導かれ、送信部101にはマイ
ク105の出力およびデータターミナル３の出力が導かれ
ている。Further, the output of the receiving unit 102 is guided to the speaker 104 and the data terminal 3, and the output of the microphone 105 and the output of the data terminal 3 are guided to the transmitting unit 101.
ここで本実施例の移動局の構成と第３図に示した従来例
の移動局とを比較すると、従来例の移動局では送受共用
回路が２組、受信部（復調）２組を要していたのに対し
て、本実施例ではそれぞれ１組であり、また、従来例で
は、受信部の出力が比較回路によって比較され、その出
力が切替られる構成になっているのに対して、本実施例
では、切替回路109がアンテナ２と送受共用回路106との
間に設けられている点で異なっている。Comparing the configuration of the mobile station of this embodiment with the conventional mobile station shown in FIG. 3, the conventional mobile station requires two sets of transmission / reception shared circuits and two sets of receiving units (demodulation). On the other hand, in the present embodiment, each set is one set, and in the conventional example, the output of the receiving unit is compared by the comparison circuit, and the output is switched. The embodiment is different in that the switching circuit 109 is provided between the antenna 2 and the transmission / reception common circuit 106.
ここで本実施例の動作を説明する。Here, the operation of this embodiment will be described.
一般に移動無線におけるフェーディングの主要因はマル
チパス伝播に起因する高速レーレーフェーディングであ
り。受信アンテナ近傍の多重反射波によるものである。
そこで、この第一実施例によれば移動局Ａは受信時には
データ伝送に必要な第５図受信電波レベル特性の所定レ
ベルＬ０以上の電界を常に受信するように２つのアンテ
ナのうちの１つを選択する。Generally, the main cause of fading in mobile radio is fast Rayleigh fading due to multipath propagation. This is due to multiple reflected waves near the receiving antenna.
Therefore, according to the first embodiment, the mobile station A uses one of the two antennas so that the mobile station A always receives an electric field of a predetermined level L 0 or more of the reception radio wave level characteristic shown in FIG. Select.
すなわち第５図において、アンテナ2aの受信電界とアン
テナ2bの受信電界はほぼ無相関にＬ−Ｌ分布を主とする
フェーディングによる移動をしており、時刻Ｔ０直後に
はアンテナ2bが選択されている。時刻Ｔ１にアンテナ2b
の受信電界がレベルＬ０より低くなると、この受信電界
レベルの低下を受信部102により検出し、この検出出力
により切替回路109を動作させて、アンテナ2bよりアン
テナ2bに切替選択して受信電界レベルはＬ０以上に維持
される。アンテナ2aとアンテナ2bが同時にレベルＬ０以
下になる確率は、単独アンテナの場合に比べ例えば１桁
以上少ないので、本発明により受信電界レベルの低下に
よる誤り率の劣化は大幅に少なくなり、高速のデータ伝
送が可能となる。That is, in FIG. 5, the received electric field of the received electric field and antenna 2b of the antenna 2a is a movement by fading which mainly L-L distributed almost uncorrelated, the antenna 2b is selected immediately after the time T 0 ing. Antenna 2b at time T 1
When the received electric field level becomes lower than the level L 0 , the received electric field level is detected by the receiving unit 102, and the switching circuit 109 is operated by this detection output to switch the antenna 2b to the antenna 2b to select the received electric field level. Is maintained above L 0 . The probability that the antenna 2a and the antenna 2b will be at the level L 0 or less at the same time is smaller than that of a single antenna by, for example, one digit or more. Therefore, according to the present invention, the deterioration of the error rate due to the decrease of the received electric field level is significantly reduced, and the high-speed Data transmission becomes possible.
本発明の切替回路109の１つの実施例を第６図に示す。
この切替回路109はサーキュレータ200を用いて、このサ
ーキュレータ200に接続されたアンテナ2a、2bの選択を
行うためのスイッチング用のダイオード201、202を備
え、このダイオード201、202を制御回路203によって制
御してアンテナの選択を行う構成である。One embodiment of the switching circuit 109 of the present invention is shown in FIG.
The switching circuit 109 includes a circulator 200 and switching diodes 201 and 202 for selecting the antennas 2a and 2b connected to the circulator 200, and the diodes 201 and 202 are controlled by a control circuit 203. This is a configuration for selecting an antenna.
受信時にはサーキュレータ200に接続したアンテナ2aを
選択するときには、ダイオード201をオープンにし、ダ
イオード202をショートするようダイオード202に直流電
流を流す。When selecting the antenna 2a connected to the circulator 200 at the time of reception, the diode 201 is opened and a direct current is passed through the diode 202 to short-circuit the diode 202.
このようなダイオードコントロール用の直流電流は制御
回路203にて、受信部102からの受信電波検出出力および
制御部103からの送受切替信号からつくる。アンテナ２
ｂを選択するときにはダイオード２０１に直流電流を流
す。Such a DC current for diode control is generated by the control circuit 203 from the detection output of the received radio wave from the receiving unit 102 and the transmission / reception switching signal from the control unit 103. Antenna 2
When selecting b, a direct current is passed through the diode 201.
第５図のように受信電界レベルによってアンテナ２ａ、
２ｂを切替えるには、制御回路２０３にて、受信部１０
２に入力される受信電波検出出力を所定レベルＬ０と比
較することによって、ダイオード２０１、２０２への直
流電流を出力しその切替を制御する。あるいは、この制
御回路203で切替前の受信電界レベルを保持して比較す
る構成とすることもできる。As shown in FIG. 5, the antenna 2a, depending on the received electric field level,
2b is switched by the control circuit 203 by the receiving unit 10
By comparing the received radio wave detection output input to 2 with a predetermined level L 0 , a direct current to the diodes 201 and 202 is output and its switching is controlled. Alternatively, the control circuit 203 may be configured to hold and compare the received electric field level before switching.
本発明の送信時にはスイッチング用ダイオード201、202
の負荷がなく、ダイオードによる歪が発生しないよう
に、切替回路109の切替ルートがアンテナ2bを選択する
ようにする。すなわち制御部103からの送信オン信号に
よりダイオード201、202をともにオープンにし、直流電
流高周波電力共ダイオード201、202の負荷にならないよ
うにし、アンテナ2bが送信用のアンテナとして使用され
る。At the time of transmission of the present invention, switching diodes 201, 202
The switching route of the switching circuit 109 selects the antenna 2b so that there is no load and the distortion due to the diode does not occur. That is, the diodes 201 and 202 are both opened by a transmission ON signal from the control unit 103 so that the diodes 201 and 202 do not become loads on the DC current and high frequency power, and the antenna 2b is used as an antenna for transmission.
第７図は本発明の第二実施例である。この例では、受信
時にはアンテナ2a、2bは切替回路109にてつくられた一
定のごく短い周囲で切替使用され、送信時にはアンテナ
ダイオード201、202共にオープンとなり、アンテナ2bが
送信用アンテナとして使用される。この切替周期は通信
情報のビット周期より短く設定することが望ましい。FIG. 7 shows a second embodiment of the present invention. In this example, at the time of reception, the antennas 2a and 2b are switched and used in a constant very short circumference made by the switching circuit 109, and at the time of transmission, both the antenna diodes 201 and 202 are opened, and the antenna 2b is used as a transmitting antenna. . It is desirable that this switching cycle be set shorter than the bit cycle of communication information.
このように構成することにより、受信回路の切替に要す
る大電力切替回路および複数の受信回路が不要になり、
移動局装置を小型化することができる。基地局装置につ
いては、十分なスペースがあり、多少は設備が大形にな
っても全体の経済効果に与える影響は小さいので、受信
設備を高感度にし、あるいはダイバシティ方式などを採
用することができる。しかし、基地局の側からも送信電
力を増大して送信することは、電波の効率的利用のたて
まえからできないので、本発明のように受信側でダイバ
シティを行うことが有利である。なお本発明の方式によ
れば音声以外のデータを高品質に伝送させることができ
る。With this configuration, a large power switching circuit and a plurality of receiving circuits required for switching the receiving circuit are unnecessary,
The mobile station device can be downsized. As for the base station equipment, there is sufficient space, and even if the equipment becomes a little larger, it has little impact on the overall economic effect, so it is possible to make the receiving equipment highly sensitive or adopt a diversity system or the like. . However, since it is not possible to increase the transmission power from the base station side for transmission in order to use radio waves efficiently, it is advantageous to perform diversity on the reception side as in the present invention. According to the method of the present invention, data other than voice can be transmitted with high quality.
第１図は従来の単信方式の陸上移動無線通信方式の構成
図。 第２図は従来の移動局無線送受信装置のブロック構成詳
細図。 第３図は従来のダイバシティ受信方式の陸上移動無線通
信方式の詳細構成図。 第４図は本発明の第一実施例のダイバシティ受信方式の
陸上移動無線通信方式の詳細構成図。 第５図は高速フェーディングを受けているアンテナ受信
電波レベル特性図。 第６図は本発明の切替回路の実施例の詳細構成図。 第７図は本発明第二実施例ダイバシティ受信方式の陸上
移動無線システム詳細構成図。 Ａ……移動局、Ｂ……基地局、１……移動無線装置（移
動局無線送受信装置）、２、2a、2b……移動局のアンテ
ナ、３……データターミナル、４……インタフェース回
路、51……基地無線装置（基地局無線送受信装置）、10
1……移動局Ａの送信部、102、102a、102b……移動局Ａ
の受信部、103……移動局Ａの制御部、104……移動局Ａ
のスピーカ、105……移動局Ａのマイク、106、106a、10
6b……移動局Ａの送受共用回路、108……比較回路、109
……切替回路、200……切替回路109を構成するサーキュ
レータ、201、202……切替回路109を構成するダイオー
ド、203……切替回路を構成する制御回路、204、205…
…切替回路109を構成する高周波チョークコイル、206〜
209……切替回路109を構成する直流阻止用コンデンサ。FIG. 1 is a block diagram of a conventional simplex land mobile radio communication system. FIG. 2 is a detailed block diagram of a conventional mobile station radio transmitter / receiver. FIG. 3 is a detailed configuration diagram of a land mobile radio communication system of a conventional diversity reception system. FIG. 4 is a detailed configuration diagram of the land mobile radio communication system of the diversity reception system of the first embodiment of the present invention. FIG. 5 is a characteristic diagram of the radio wave level received by the antenna which is subjected to high speed fading. FIG. 6 is a detailed configuration diagram of an embodiment of the switching circuit of the present invention. FIG. 7 is a detailed configuration diagram of a land mobile radio system of a diversity reception system according to the second embodiment of the present invention. A ... Mobile station, B ... Base station, 1 ... Mobile radio device (mobile station radio transmitter / receiver), 2, 2a, 2b ... Mobile station antenna, 3 ... Data terminal, 4 ... Interface circuit, 51 ... Base station radio equipment (base station radio transceiver), 10
1 ... Transmitter of mobile station A, 102, 102a, 102b ... Mobile station A
Receiving unit, 103 ... Control unit of mobile station A, 104 ... Mobile station A
Speaker, 105 ... Mobile station A microphone, 106, 106a, 10
6b …… Transmission / reception shared circuit of mobile station A, 108 …… Comparison circuit, 109
...... Switching circuit, 200 circulators constituting switching circuit 109, 201, 202 ...... Diodes constituting switching circuit 109, 203 ...... Control circuits constituting switching circuit, 204, 205 ...
... High-frequency choke coil that constitutes the switching circuit 109, 206-
209 ... A DC blocking capacitor that constitutes the switching circuit 109.
Claims (3)
波を交互に送信することにより通信を行う移動無線通信
方式において、 前記移動局は、送信部と、受信部と、複数のアンテナ
と、前記送信部及び受信部が接続される送受共用回路
と、前記送受共用回路及び前記複数のアンテナに結合さ
れ、送信時には前記複数のアンテナの特定の一つを固定
的に前記送受共用回路に接続し、受信時には前記複数の
アンテナを切替えて前記送受共用回路に接続する切替回
路とを含み、 該切替回路は、前記複数のアンテナと前記送受共用回路
とを接続するサーキュレータと、前記複数のアンテナ対
応に設けられ前記受信時に所望のアンテナを前記サーキ
ュレータに結合させるための複数のダイオードと、該複
数のダイオードを選択起動させる制御回路とを有する、 ことを特徴とする移動無線通信方式のダイバシティ方
式。1. A mobile radio communication system in which a base station and a mobile station communicate by alternately transmitting radio waves of the same radio frequency, wherein the mobile station includes a transmitter, a receiver, and a plurality of antennas. And a shared transmission / reception circuit to which the transmission unit and the reception unit are connected, the transmission / reception shared circuit and the plurality of antennas, and a specific one of the plurality of antennas is fixed to the transmission / reception shared circuit during transmission. A switching circuit for connecting and connecting the plurality of antennas to the common transmission / reception circuit at the time of reception, the switching circuit including a circulator for connecting the plurality of antennas to the common transmission / reception circuit; and the plurality of antennas. A plurality of diodes provided correspondingly for coupling a desired antenna to the circulator at the time of reception, and a control circuit for selectively activating the plurality of diodes. To, diversity system of the mobile radio communication system, characterized in that.
号の電界強度の大きいものを選択して利用する特許請求
の範囲第(1)項に記載の移動無線通信方式のダイバシテ
ィ方式。2. The diversity system of the mobile radio communication system according to claim 1, wherein the receiving device selects and uses a signal having a large electric field strength of signals received by a plurality of antennas.
替えて利用する特許請求の範囲第(1)項に記載の移動無
線通信方式のダイバシティ方式。3. The diversity system of the mobile radio communication system according to claim 1, wherein the receiving device switches and uses a plurality of antennas in a short cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240478A JPH0616596B2 (en) | 1983-12-20 | 1983-12-20 | Mobile radio communication diversity system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240478A JPH0616596B2 (en) | 1983-12-20 | 1983-12-20 | Mobile radio communication diversity system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60130932A JPS60130932A (en) | 1985-07-12 |
| JPH0616596B2 true JPH0616596B2 (en) | 1994-03-02 |
Family
ID=17060108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58240478A Expired - Lifetime JPH0616596B2 (en) | 1983-12-20 | 1983-12-20 | Mobile radio communication diversity system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616596B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08330996A (en) * | 1995-05-30 | 1996-12-13 | Sony Corp | Antenna multicoupler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843638A (en) * | 1981-09-08 | 1983-03-14 | Fujitsu Ltd | Space diversity system |
-
1983
- 1983-12-20 JP JP58240478A patent/JPH0616596B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60130932A (en) | 1985-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2520115B2 (en) | Burst mode two-way wireless communication system | |
| CA1207390A (en) | Radio telephones having improved transmitting and receiving characteristics | |
| KR100446507B1 (en) | Diversity apparatus and method of mobile telecommunication terminal | |
| US5161252A (en) | Diversity antenna communication system | |
| JPH0338932A (en) | Space diversity system | |
| US20060286945A1 (en) | Inter-frequency handover for multiple antenna wireless transmit/receive units | |
| CN113922837B (en) | Radio frequency circuit, radio frequency module and electronic equipment | |
| JP3108643B2 (en) | Antenna switching control method | |
| JPH0685512B2 (en) | Wireless communication system | |
| JPH0616596B2 (en) | Mobile radio communication diversity system | |
| US6549760B1 (en) | Communications device | |
| JPH0620186B2 (en) | Portable radio | |
| JPH07245577A (en) | Diversity communication equipment | |
| JPH02200018A (en) | Diversity branch switching control system | |
| JPH0846558A (en) | Non-directional system of transmitting-receiving antenna with angle and polarized wave diversity | |
| JP3710761B2 (en) | Wireless communication apparatus and wireless communication method | |
| US6449468B1 (en) | Mobile radiocommunication terminal comprising at least two antennas with a diversity of polarizations for signal reception | |
| GB2353185A (en) | Dual mode mobile phone with diversity receiver | |
| JP2000353998A (en) | Diversity receiver and diversity transmitter | |
| JP2699684B2 (en) | Mobile receiver | |
| JP2581424B2 (en) | Hot standby transceiver | |
| JPH07123077A (en) | Space diversity transmitter-receiver | |
| JPS6231537B2 (en) | ||
| JPH03293825A (en) | Diversity receiver | |
| JP2000134121A (en) | Antenna selector for radio device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |