JPH0621870A - Radio communication equipment - Google Patents
Radio communication equipmentInfo
- Publication number
- JPH0621870A JPH0621870A JP40096290A JP40096290A JPH0621870A JP H0621870 A JPH0621870 A JP H0621870A JP 40096290 A JP40096290 A JP 40096290A JP 40096290 A JP40096290 A JP 40096290A JP H0621870 A JPH0621870 A JP H0621870A
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- JP
- Japan
- Prior art keywords
- station
- master station
- level
- reception
- signal
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基地局に接続される親
局を介して、基地局と各親局が形成する無線ゾーン内の
子局との間で双方向通信を行う無線通信装置に関する。
特に、親局において複数の子局からの受信信号の歪みを
低減することができる無線通信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device for bidirectional communication between a base station and a slave station within a wireless zone formed by each master station via a master station connected to the base station. Regarding
In particular, the present invention relates to a wireless communication device capable of reducing distortion of received signals from a plurality of child stations in a parent station.
【０００２】[0002]
【従来の技術】図４は、基地局と子局との間に親局が介
在する無線通信装置の構成例を示す図である。図におい
て、基地局５０は、複数の子局宛の高周波信号を電気・
光変換器（Ｅ／Ｏ）５１で光信号に変換し、光ファイバ
６０を介して親局７０まで伝送する。親局７０は、その
光信号を光・電気変換器（Ｏ／Ｅ）７１で電気信号に変
換し、送受分波器７２を介してアンテナ７３から送信す
る。複数の子局８０1 、８０2では、親局７０から送信
された信号をアンテナ８１で受信し、送受分波器８２を
介して復調器８３に入力し、自子局宛の信号について復
調する。2. Description of the Related Art FIG. 4 is a diagram showing a configuration example of a wireless communication device in which a master station is interposed between a base station and a slave station. In the figure, a base station 50 uses a high-frequency signal for a plurality of slave stations as an electric signal.
An optical signal is converted by an optical converter (E / O) 51 and transmitted to a master station 70 via an optical fiber 60. The master station 70 converts the optical signal into an electric signal by an optical / electrical converter (O / E) 71, and transmits the electric signal from an antenna 73 via a transmission / reception duplexer 72. In the plurality of slave stations 80 1 and 80 2 , the signal transmitted from the master station 70 is received by the antenna 81, input to the demodulator 83 via the transmission / reception duplexer 82, and the signal addressed to the own slave station is demodulated. .
【０００３】一方、各子局８０1 、８０2 から基地局５
０宛の送信信号は変調器８４で変調され、送受分波器８
２を介して各アンテナ８１から送信される。親局７０で
は、各子局８０1 、８０2 から送信された信号をアンテ
ナ７３で受信し、送受分波器７２を介して電気・光変換
器（Ｅ／Ｏ）７４で光信号に変換し、光ファイバ６０を
介して基地局５０まで伝送する。基地局５０は、その光
信号を光・電気変換器（Ｏ／Ｅ）５２で電気信号に変換
して処理する。On the other hand, from the slave stations 80 1 and 80 2 to the base station 5
The transmission signal addressed to 0 is modulated by the modulator 84, and is transmitted / received by the duplexer 8
2 is transmitted from each antenna 81. In the master station 70, the signals transmitted from the slave stations 80 1 and 80 2 are received by the antenna 73 and converted into optical signals by the electric / optical converter (E / O) 74 via the transmission / reception duplexer 72. , To the base station 50 via the optical fiber 60. The base station 50 converts the optical signal into an electric signal by an optical / electrical converter (O / E) 52 and processes it.
【０００４】[0004]
【発明が解決しようとする課題】ところで、親局７０に
は、複数の子局８０1 、８０2 からの信号が受信される
が、それらの受信レベルの差が電気・光変換器７４のダ
イナミックレンジよりも大きいと、受信レベルの高いほ
うに歪みが生してしまう。このような親局における受信
レベルの大小は、各子局の送信電力をあらかじめ所定値
に設定してあっても、親局と子局との物理的な距離の他
にいろいろな電波環境の影響により生ずるものであっ
た。したがって、従来方式では、親局７０から基地局５
０への信号伝送に際してレベル差の大きい複数の信号を
扱うことになり、伝送特性の大きな劣化が避けられなか
った。By the way, the master station 70 receives signals from a plurality of slave stations 80 1 and 80 2, and the difference in the reception level between them causes the dynamic difference of the electro-optical converter 74. If it is larger than the range, distortion will occur at the higher reception level. Even if the transmission power of each slave station is set to a predetermined value in advance, the magnitude of the reception level at the master station affects the influence of various radio wave environments in addition to the physical distance between the master station and slave stations. It was caused by. Therefore, in the conventional method, the master station 70 to the base station 5
When transmitting a signal to 0, a plurality of signals having a large level difference are dealt with, and a large deterioration in transmission characteristics cannot be avoided.
【０００５】本発明は、親局で受信する各子局からの信
号の受信レベルの差を最小限に抑えることができる無線
通信装置を提供することを目的とする。It is an object of the present invention to provide a wireless communication device capable of minimizing the difference in the reception level of the signals from the slave stations received by the master station.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載の発明
は、基地局と移動する複数の子局との間に無線信号と光
信号とのインタフェースをとる親局が介在し、該基地局
と該親局との間を無線周波数帯の高周波信号の光信号を
伝送する光ファイバで接続して該基地局と該子局との双
方向通信を行う無線通信装置において、前記子局には、
受信信号を所定のレベルに増幅する自動利得制御増幅器
と、前記自動利得制御増幅器から受信信号のレベル情報
を抽出する受信レベル検出器と、前記受信信号のレベル
情報に応じて前記親局への送信信号のレベルを調整し、
前記親局における受信レベルを一定にする電力増幅器と
を備えたことを特徴とする。According to a first aspect of the present invention, a base station for interfacing a radio signal and an optical signal is interposed between a base station and a plurality of moving child stations, and the base station is provided. In the wireless communication device for performing bidirectional communication between the base station and the slave station by connecting an optical fiber that transmits an optical signal of a radio frequency band between the base station and the master station, ,
An automatic gain control amplifier for amplifying a received signal to a predetermined level, a reception level detector for extracting level information of the received signal from the automatic gain control amplifier, and transmission to the master station according to the level information of the received signal Adjust the signal level,
And a power amplifier that keeps the reception level at the master station constant.
【０００７】請求項２に記載の発明は、基地局と移動す
る複数の子局との間に無線信号と光信号とのインタフェ
ースをとる親局が介在し、該基地局と該親局との間を無
線周波数帯の高周波信号の光信号を伝送する光ファイバ
で接続して該基地局と該子局との双方向通信を行う無線
通信装置において、前記親局には、複数の子局からの受
信信号を分離する分離器と、前記分離器出力から各子局
に対応する受信レベルを検出する受信レベル検出器と、
前記各受信レベルをレベル情報に変換するレベル情報発
生器と、前記各レベル情報を各子局宛の送信信号に多重
化する多重器とを備え、前記子局には、受信信号から前
記レベル情報を分離する分離器と、前記分離器で分離さ
れたレベル情報から対応する親局における受信レベルを
検出する受信レベル検出器と、前記親局における受信レ
ベルに応じて前記親局への送信信号のレベルを調整し、
前記親局における受信レベルを一定にする電力増幅器と
を備えたことを特徴とする。According to a second aspect of the invention, a master station for interfacing a radio signal and an optical signal is interposed between the base station and a plurality of moving slave stations, and the base station and the master station are connected to each other. In a wireless communication device that performs two-way communication between the base station and the slave station by connecting an optical fiber that transmits an optical signal of a high-frequency signal in a radio frequency band, the master station includes a plurality of slave stations. A separator for separating the received signal of, and a reception level detector for detecting the reception level corresponding to each slave station from the separator output,
A level information generator for converting each reception level into level information, and a multiplexer for multiplexing each level information into a transmission signal addressed to each slave station, wherein the slave station includes the level information from the reception signal. A separator for separating, a reception level detector for detecting the reception level in the corresponding master station from the level information separated in the separator, and a transmission signal to the master station according to the reception level in the master station Adjust the level,
And a power amplifier that keeps the reception level at the master station constant.
【０００８】請求項３に記載の発明は、請求項２に記載
の無線通信装置において、親局の機能を基地局に移し、
その分離器では各親局を介して伝送された複数の子局か
らの受信信号を分離する構成であることを特徴とする。According to a third aspect of the present invention, in the wireless communication apparatus according to the second aspect, the function of the master station is transferred to the base station,
The demultiplexer is characterized in that it demultiplexes received signals from a plurality of child stations transmitted via each parent station.
【０００９】[0009]
【作用】請求項１に記載の発明は、子局の受信レベルと
親局の受信レベルとの相関が大きいことを利用し、子局
で親局から送信された信号の受信レベルを検出し、それ
を親局での受信レベルとみなして子局の送信電力の制御
に用いる。すなわち、子局での受信レベルの変動を親局
での受信レベルの変動とし、受信レベルが高いときには
例えば子局の電力増幅器の利得を低下させ、受信レベル
が低いときにはその逆の制御を行うことにより、親局に
おける受信レベルを一定に保持することができる。According to the invention described in claim 1, the fact that the correlation between the reception level of the slave station and the reception level of the master station is large is used to detect the reception level of the signal transmitted from the master station in the slave station, This is regarded as the reception level at the master station and is used to control the transmission power of the slave station. That is, the fluctuation of the reception level at the slave station is regarded as the fluctuation of the reception level at the master station, and when the reception level is high, for example, the gain of the power amplifier of the slave station is reduced, and when the reception level is low, the opposite control is performed. As a result, the reception level at the master station can be kept constant.
【００１０】請求項２に記載の発明は、親局で各子局対
応にその受信レベルを検出してその情報を子局に伝送
し、子局でその情報をもとに送信電力を制御する。すな
わち、親局における受信レベルを各子局にフィードバッ
クしてその送信電力を制御することにより、親局におけ
る受信レベルを一定に保持することができる。請求項３
に記載の発明は、親局における各子局対応の受信レベル
を基地局で検出し、基地局から親局を介して各子局にフ
ィードバックしてその送信電力を制御することにより、
親局における受信レベルを一定に保持することができ
る。In the second aspect of the invention, the master station detects the reception level corresponding to each slave station, transmits the information to the slave station, and the slave station controls the transmission power based on the information. . That is, the reception level at the master station can be kept constant by feeding back the reception level at the master station to each slave station and controlling the transmission power thereof. Claim 3
The invention described in, by detecting the reception level corresponding to each slave station in the base station at the base station, by controlling the transmission power by feeding back from the base station to each slave station via the master station,
The reception level at the master station can be kept constant.
【００１１】このように、親局で受信する各子局からの
信号の受信レベルをそれぞれ一定にすることができるの
で、その差が最小限に抑えられ電気・光変換器での歪み
を小さくすることができる。As described above, since the reception levels of the signals from the slave stations received by the master station can be made constant, the difference between them can be minimized and the distortion in the electro-optical converter can be reduced. be able to.
【００１２】[0012]
【実施例】図１は、請求項１に記載の発明に対応する実
施例構成を示すブロック図である。図において、基地局
５０、光ファイバ６０および親局７０の構成は、図５に
示す従来のものと同様である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the structure of an embodiment corresponding to the invention described in claim 1. In the figure, the configurations of the base station 50, the optical fiber 60, and the master station 70 are the same as those of the conventional one shown in FIG.
【００１３】本発明の特徴とするところは、本実施例で
は子局１０1 、１０2 において、送受分波器８２と復調
器８３との間に自動利得制御増幅器１１を挿入し、受信
レベル検出器１２で自動利得制御増幅器１１から得られ
る受信信号のレベル情報を抽出する。すなわち、自動利
得制御増幅器１１は復調器８３の入力レベルを一定にす
るものであるが、その増幅器の制御電圧が受信レベルに
対応しており、受信レベル検出器１２はこの制御電圧か
ら受信レベルを求めるものである。A feature of the present invention is that in this embodiment, in the slave stations 10 1 and 10 2 , the automatic gain control amplifier 11 is inserted between the transmission / reception branching filter 82 and the demodulator 83 to detect the reception level. The device 12 extracts the level information of the received signal obtained from the automatic gain control amplifier 11. That is, the automatic gain control amplifier 11 keeps the input level of the demodulator 83 constant, but the control voltage of the amplifier corresponds to the reception level, and the reception level detector 12 changes the reception level from this control voltage. It is what you want.
【００１４】さらに、変調器８４と送受分波器８２との
間に利得制御が可能な電力増幅器１３を挿入し、受信レ
ベル検出器１２を介して取り出される自動利得制御増幅
器１１の制御電圧を用いてその利得を制御し、親局への
送信信号のレベルを調整することにより、親局における
受信レベルを一定にすることができる。図２は、請求項
２に記載の発明に対応する実施例構成を示すブロック図
である。Further, a power amplifier 13 capable of gain control is inserted between the modulator 84 and the transmission / reception duplexer 82, and the control voltage of the automatic gain control amplifier 11 taken out through the reception level detector 12 is used. By controlling the gain by adjusting the level of the transmission signal to the master station, the reception level at the master station can be made constant. FIG. 2 is a block diagram showing the configuration of an embodiment corresponding to the invention described in claim 2.
【００１５】図において、基地局５０の構成は、図５に
示す従来のものと同様である。本発明の特徴とするとこ
ろは、本実施例では親局２０において、送受分波器７２
から電気・光変換器７４に出力される信号を分岐して取
り込み、各子局対応（収容子局数分）の受信信号を分離
する分離器２１、分離器２１から出力される各子局から
の信号の受信レベルを検出する受信レベル検出器２２、
各子局対応の受信レベルに応じたレベル情報を生成する
レベル情報発生器２３、光・電気変換器７１と送受分波
器７２との間に挿入されて各子局対応の送信信号にレベ
ル情報を多重化する多重器２４を備えた構成にある。す
なわち、親局２０における各子局対応の受信レベルが親
局２０から各子局にフィードバックされる。In the figure, the configuration of the base station 50 is the same as the conventional one shown in FIG. The feature of the present invention resides in that in this embodiment, the transmission / reception duplexer 72 in the master station 20.
From the slave station output from the separator 21 and the separator 21 for branching in the signal output from the optical / electrical converter 74 to capture the received signal corresponding to each slave station (the number of accommodated slave stations) Reception level detector 22 for detecting the reception level of the signal of
The level information generator 23, which generates level information according to the reception level corresponding to each slave station, is inserted between the optical / electrical converter 71 and the transmission / reception demultiplexer 72, and the level information is included in the transmission signal corresponding to each slave station Is provided with a multiplexer 24 for multiplexing. That is, the reception level corresponding to each slave station in the master station 20 is fed back from the master station 20 to each slave station.
【００１６】さらに、子局３０において、送受分波器８
２と復調器８３との間に親局２０から多重化されて伝送
されるレベル情報を分離する分離器３１を挿入し、分離
されたレベル情報を所定の制御信号に変換する制御器３
２を接続する。変調器８４と送受分波器８２との間に利
得制御が可能な電力増幅器３３を挿入し、制御器３２の
制御信号でその利得を制御し、親局への送信信号のレベ
ルを調整することにより、親局における受信レベルを一
定にすることができる。Further, in the slave station 30, the transmission / reception demultiplexer 8
2 and the demodulator 83, the separator 3 for separating the level information multiplexed and transmitted from the master station 20 is inserted, and the controller 3 for converting the separated level information into a predetermined control signal.
Connect two. A power amplifier 33 capable of gain control is inserted between the modulator 84 and the duplexer 82, the gain is controlled by the control signal of the controller 32, and the level of the transmission signal to the master station is adjusted. As a result, the reception level at the master station can be made constant.
【００１７】図３は、請求項３に記載の発明に対応する
実施例構成を示すブロック図である。図において、親局
７０の構成は図５に示す従来のものと同様であり、子局
３０の構成は図２に示す実施例と同様である。本発明の
特徴とするところは、本実施例では基地局４０が図２に
示す親局３０と同様に、分離器４１、受信レベル検出器
４２、レベル情報発生器４３、多重器４４を備えた構成
にある。ただし、親局３０が収容子局数分に対応する分
離器３１以下の構成であるのに対して、基地局４０では
各親局３０1 、３０2 に対応するすべての収容子局数分
の処理が必要となる。すなわち、基地局４０における各
子局対応の受信レベルが、基地局４０から各親局３
０1 、３０2 を介して各子局にフィードバックされ、各
子局で送信信号のレベルを調整することにより、親局に
おける受信レベルを一定にすることができる。FIG. 3 is a block diagram showing the configuration of an embodiment corresponding to the invention described in claim 3. In FIG. In the figure, the master station 70 has the same configuration as the conventional one shown in FIG. 5, and the slave station 30 has the same configuration as the embodiment shown in FIG. A feature of the present invention is that in this embodiment, the base station 40 includes a separator 41, a reception level detector 42, a level information generator 43, and a multiplexer 44 as in the master station 30 shown in FIG. In the configuration. However, while the master station 30 has a configuration including the separator 31 or less corresponding to the number of accommodated slave stations, the base station 40 corresponds to all the accommodated slave stations corresponding to the master stations 30 1 and 30 2. Processing is required. That is, the reception level corresponding to each slave station in the base station 40 is from the base station 40 to each master station 3
It is fed back to each slave station via 0 1 and 30 2, and the reception level at the master station can be made constant by adjusting the level of the transmission signal at each slave station.
【００１８】[0018]
【発明の効果】以上説明したように本発明は、親局で複
数の子局からの信号を受信してもそのレベル差を最小限
に抑えることができるので、親局でダイナミックレンジ
の小さい電気・光変換器により光信号への変換処理を行
っても、レベル差により生ずる歪みを低減させることが
できる。したがって、親局に収容できる子局数の増加が
容易になり、かつ大きなダイナミックレンジを必要とし
ないので簡易な構成で親局を実現することができる。As described above, according to the present invention, even if the master station receives signals from a plurality of slave stations, the level difference between them can be suppressed to a minimum, so that the master station has a small dynamic range. -Even if the optical converter performs conversion processing to an optical signal, it is possible to reduce the distortion caused by the level difference. Therefore, it becomes easy to increase the number of slave stations that can be accommodated in the master station, and a large dynamic range is not required, so that the master station can be realized with a simple configuration.
【図１】請求項１に記載の発明に対応する実施例構成を
示すブロック図である。FIG. 1 is a block diagram showing a configuration of an embodiment corresponding to the invention described in claim 1.
【図２】請求項２に記載の発明に対応する実施例構成を
示すブロック図である。FIG. 2 is a block diagram showing a configuration of an embodiment corresponding to the invention described in claim 2.
【図３】請求項３に記載の発明に対応する実施例構成を
示すブロック図である。FIG. 3 is a block diagram showing a configuration of an embodiment corresponding to the invention described in claim 3.
【図４】基地局と子局との間に親局が介在する無線通信
装置の構成例を示す図である。FIG. 4 is a diagram showing a configuration example of a wireless communication device in which a master station is interposed between a base station and a slave station.
１０1 ，１０2 子局 １１ 自動利得制御増幅器 １２ 受信レベル検出器 １３ 電力増幅器 ２０ 親局 ２１ 分離器 ２２ 受信レベル検出器 ２３ レベル情報発生器 ２４ 多重器 ３０ 子局 ３１ 分離器 ３２ 制御器 ３３ 電力増幅器 ４０ 基地局 ４１ 分離器 ４２ 受信レベル検出器 ４３ レベル情報発生器 ４４ 多重器 ５０ 基地局 ５１ 電気・光変換器（Ｅ／０） ５２ 光・電気変換器（Ｏ／Ｅ） ６０ 光ファイバ ７０ 親局 ７１ 電気・光変換器（Ｅ／０） ７２ 送受分波器 ７３ アンテナ ７４ 光・電気変換器（Ｏ／Ｅ） ８０1 ，８０2 子局 ８１ アンテナ ８２ 送受分波器 ８３ 復調器 ８４ 変調器10 1 , 10 2 Slave Station 11 Automatic Gain Control Amplifier 12 Reception Level Detector 13 Power Amplifier 20 Master Station 21 Separator 22 Reception Level Detector 23 Level Information Generator 24 Multiplexer 30 Slave Station 31 Separator 32 Controller 33 Power Amplifier 40 Base station 41 Separator 42 Reception level detector 43 Level information generator 44 Multiplexer 50 Base station 51 Electric / optical converter (E / 0) 52 Optical / electrical converter (O / E) 60 Optical fiber 70 Parent Station 71 Electric / optical converter (E / 0) 72 Transmit / receive demultiplexer 73 Antenna 74 Optical / electrical converter (O / E) 80 1 , 80 2 Slave station 81 Antenna 82 Transmit / receive demultiplexer 83 Demodulator 84 Modulator
Claims (3)
線信号と光信号とのインタフェースをとる親局が介在
し、該基地局と該親局との間を無線周波数帯の高周波信
号の光信号を伝送する光ファイバで接続して該基地局と
該子局との双方向通信を行う無線通信装置において、 前記子局には、 受信信号を所定のレベルに増幅する自動利得制御増幅器
と、 前記自動利得制御増幅器から受信信号のレベル情報を抽
出する受信レベル検出器と、 前記受信信号のレベル情報に応じて前記親局への送信信
号のレベルを調整し、前記親局における受信レベルを一
定にする電力増幅器とを備えたことを特徴とする無線通
信装置。1. A high frequency radio frequency band is provided between a base station and a plurality of moving slave stations, and a master station is interposed between the base station and the master station. In a wireless communication device for bidirectional communication between the base station and the slave station, which is connected by an optical fiber for transmitting an optical signal of a signal, the slave station has an automatic gain control for amplifying a received signal to a predetermined level. An amplifier, a reception level detector that extracts level information of a reception signal from the automatic gain control amplifier, and adjusts the level of a transmission signal to the master station according to the level information of the reception signal, and receives at the master station. A wireless communication device, comprising: a power amplifier that keeps a level constant.
線信号と光信号とのインタフェースをとる親局が介在
し、該基地局と該親局との間を無線周波数帯の高周波信
号の光信号を伝送する光ファイバで接続して該基地局と
該子局との双方向通信を行う無線通信装置において、 前記親局には、 複数の子局からの受信信号を分離する分離器と、 前記分離器出力から各子局に対応する受信レベルを検出
する受信レベル検出器と、 前記各受信レベルをレベル情報に変換するレベル情報発
生器と、 前記各レベル情報を各子局宛の送信信号に多重化する多
重器とを備え、 前記子局には、 受信信号から前記レベル情報を分離する分離器と、 前記分離器で分離されたレベル情報から対応する親局に
おける受信レベルを検出する受信レベル検出器と、 前記親局における受信レベルに応じて前記親局への送信
信号のレベルを調整し、前記親局における受信レベルを
一定にする電力増幅器とを備えたことを特徴とする無線
通信装置。2. A high frequency radio frequency band between the base station and the master station, wherein a master station for interfacing a radio signal and an optical signal is interposed between the base station and a plurality of moving slave stations. In a wireless communication device that performs bidirectional communication between the base station and the slave station by connecting with an optical fiber that transmits an optical signal of a signal, the master station includes a separation unit that separates reception signals from a plurality of slave stations. A receiver, a reception level detector that detects a reception level corresponding to each slave station from the output of the separator, a level information generator that converts each reception level into level information, and each level information addressed to each slave station. A multiplexer for multiplexing the transmission signal of, a separator for separating the level information from the received signal in the slave station, and a reception level at the corresponding master station from the level information separated by the separator. A reception level detector for detecting, and the parent A radio communication device, comprising: a power amplifier that adjusts the level of a transmission signal to the master station according to the reception level of the master station to make the reception level of the master station constant.
て、 親局の機能を基地局に移し、その分離器では各親局を介
して伝送された複数の子局からの受信信号を分離する構
成であることを特徴とする無線通信装置。3. The radio communication device according to claim 2, wherein the function of the master station is transferred to the base station, and the separator separates the received signals from the plurality of slave stations transmitted via each master station. A wireless communication device having a configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40096290A JPH0621870A (en) | 1990-12-07 | 1990-12-07 | Radio communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40096290A JPH0621870A (en) | 1990-12-07 | 1990-12-07 | Radio communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0621870A true JPH0621870A (en) | 1994-01-28 |
Family
ID=18510819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40096290A Pending JPH0621870A (en) | 1990-12-07 | 1990-12-07 | Radio communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621870A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6031828A (en) * | 1996-04-10 | 2000-02-29 | Oki Electric Industry Co., Ltd | Radio communication system |
| WO2005011316A1 (en) * | 2003-07-25 | 2005-02-03 | Matsushita Electric Industrial Co., Ltd. | Radio communication system |
| JP2005065241A (en) * | 2003-07-25 | 2005-03-10 | Matsushita Electric Ind Co Ltd | Radio communication system |
-
1990
- 1990-12-07 JP JP40096290A patent/JPH0621870A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6031828A (en) * | 1996-04-10 | 2000-02-29 | Oki Electric Industry Co., Ltd | Radio communication system |
| WO2005011316A1 (en) * | 2003-07-25 | 2005-02-03 | Matsushita Electric Industrial Co., Ltd. | Radio communication system |
| JP2005065241A (en) * | 2003-07-25 | 2005-03-10 | Matsushita Electric Ind Co Ltd | Radio communication system |
| US7460829B2 (en) | 2003-07-25 | 2008-12-02 | Panasonic Corporation | Wireless communication system |
| JP4589671B2 (en) * | 2003-07-25 | 2010-12-01 | パナソニック株式会社 | Wireless communication system |
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