JPH01274534A - Transmission system for digital radio using polarized wave in common - Google Patents
Transmission system for digital radio using polarized wave in commonInfo
- Publication number
- JPH01274534A JPH01274534A JP10523088A JP10523088A JPH01274534A JP H01274534 A JPH01274534 A JP H01274534A JP 10523088 A JP10523088 A JP 10523088A JP 10523088 A JP10523088 A JP 10523088A JP H01274534 A JPH01274534 A JP H01274534A
- Authority
- JP
- Japan
- Prior art keywords
- line
- quality
- digital radio
- polarization
- cross
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 12
- 230000006866 deterioration Effects 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000005388 cross polarization Methods 0.000 claims description 33
- 230000010287 polarization Effects 0.000 claims description 16
- 239000002131 composite material Substances 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- JCCNYMKQOSZNPW-UHFFFAOYSA-N loratadine Chemical compound C1CN(C(=O)OCC)CCC1=C1C2=NC=CC=C2CCC2=CC(Cl)=CC=C21 JCCNYMKQOSZNPW-UHFFFAOYSA-N 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は偏波共用ディジタル無線伝送方式に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a polarization-sharing digital wireless transmission system.
高速のデータ信号を伝送するディジタル無線伝送方式は
、回線の信頼度を向上するために予備回線を備え、又、
周波数利用効率を向上するために偏波共用を行うことが
多い。Digital wireless transmission systems that transmit high-speed data signals are equipped with backup lines to improve line reliability, and
Polarization sharing is often used to improve frequency usage efficiency.
互いに直交する２偏波なそれぞれ別の信号の伝送に用い
る偏波共用は、周波数利用効率を２倍に向上できるが、
降雨等による伝搬路の媒質の異方向性のために発生する
交差偏波で両偏波間に交差偏波干渉が生じるので、交差
偏波干渉除去装置によってこの干渉を除去することが行
われている。Polarization sharing, which is used to transmit two separate polarized signals that are orthogonal to each other, can double the frequency utilization efficiency, but
Cross-polarization interference occurs between both polarizations due to the anisotropy of the propagation path medium due to rain, etc., so this interference is removed using a cross-polarization interference removal device. .
ディジタル無線伝送方式に適した交差偏波干渉除去装置
として、干渉を受ける主偏波側と与える異偏波側との両
方の復調されたベースバンド信号情報に基づきトランス
バーサルフィルタを制御し、このトランスバーサルフィ
ルタを介して異波側の受信信号を主偏波側の受信信号に
結合することにより交差偏波干渉を除去する装置が知ら
れている。As a cross-polarization interference removal device suitable for digital wireless transmission systems, the transversal filter is controlled based on the demodulated baseband signal information of both the main polarization side receiving interference and the different polarization side giving interference. 2. Description of the Related Art A device is known that removes cross-polarization interference by combining a reception signal on the side of a different wave with a reception signal on the main polarization side via a versal filter.
この結合をベースバンド周波帯で行う装置の一例が特開
昭５５−１３．３１５６号公報に記載されており、又、
結合を中間周波帯で行う装置の一例が特開昭５９−７７
７３４号公報に記載されている。An example of a device that performs this coupling in the baseband frequency band is described in JP-A-55-13.3156, and
An example of a device that performs coupling in the intermediate frequency band is disclosed in Japanese Patent Application Laid-Open No. 59-77.
It is described in Publication No. 734.
これ等の交差偏波干渉除去装置は、フェージング等によ
って異偏波側の品質が極端に劣化し異偏波側で正常なベ
ースバンド信号情報が得られなくなると、干渉除去がで
きなくなる。These cross-polarization interference canceling devices cannot cancel interference when the quality of the different polarization side is extremely degraded due to fading or the like and normal baseband signal information cannot be obtained on the different polarization side.
上述した交差偏波干渉除去装置を備えた偏波共用ディジ
タル無線伝送方式では、各回線の品質を常時監視し、品
質の劣化した回線を予備回線に切替えるようになってい
た。In the polarization-sharing digital wireless transmission system equipped with the cross-polarization interference canceling device described above, the quality of each line is constantly monitored, and lines with degraded quality are switched to backup lines.
上述した従来の偏波共用ディジタル無線伝送方式は、大
きな交差偏波干渉を受けている回線の異偏波側で品質が
劣化して交差偏波干渉除去装置が正常に動作しなくなる
と、この交差偏波干渉を受けている回線の品質が急速に
劣化するので、予備回線への回線切替の完了前にこの回
線が断になり、瞬断を起すことがあるという欠点がある
。In the conventional dual-polarization digital wireless transmission system described above, if the quality deteriorates on the different polarization side of the line that is experiencing large cross-polarization interference and the cross-polarization interference canceling device no longer operates properly, this cross-polarization interference cancels. Since the quality of the line affected by polarization interference rapidly deteriorates, there is a drawback that the line may be disconnected before switching to the protection line is completed, causing a momentary interruption.
本発明の目的は、異偏波側の品質劣化による瞬断を防止
できる偏波共用ディジタル無線伝送方式を提供すること
にある。An object of the present invention is to provide a polarization-sharing digital wireless transmission system that can prevent instantaneous interruptions due to quality deterioration on the side of different polarizations.
本発明の偏波共用ディジタル無線伝送方式は、互に直交
する第１及び第２の偏波を用いる第１及び第２のディジ
タル無線回線と、この第１及び第２のディジタル無線回
線とは異る少くとも２つの第３のディジタル無線回線と
、前記第１及び第２のディジタル無線回線の受信信号を
復調して得た両方のベースバンド信号情報を基にして前
記第１のディジタル無線回線が前記第２のディジタル無
線回線に与えた交差偏波干渉及び前記第２のディジタル
無線回線が前記第１のディジタル無線回線に与えた交差
偏波干渉を除去する交差偏波干渉除去装置と、前記第１
のディジタル無線回線の品質劣化の程度を検出する第１
の検出手段と、前記第２のディジタル無線回線の品質劣
化の程度を検出する第２の検出手段とを備える偏波共用
ディジタル無線伝送方式において、前記第１及び第２の
検出手段の少くとも一方が品質劣化を検出したとき品質
劣化の程度に応じて前記第１及び第２のディジタル無線
回線を前記第３のディジタル無線回線に切替える回線切
替装置を含んでいる。The polarization-sharing digital radio transmission system of the present invention includes first and second digital radio lines that use first and second polarized waves that are orthogonal to each other, and the first and second digital radio lines are different from each other. the first digital radio line based on baseband signal information obtained by demodulating received signals of at least two third digital radio lines and the first and second digital radio lines; a cross-polarization interference removal device for removing cross-polarization interference imparted to the second digital radio line and cross-polarization interference imparted by the second digital radio line to the first digital radio line; 1
The first step is to detect the degree of quality deterioration of the digital wireless line.
and a second detection means for detecting the degree of quality deterioration of the second digital radio line, in which at least one of the first and second detection means is provided. includes a line switching device that switches the first and second digital wireless lines to the third digital wireless line depending on the degree of quality deterioration when the digital wireless line detects quality deterioration.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
第１図に示す実施例は、第２図に示すように、それぞれ
垂直偏波を用いる現用の無線回線１ｖ〜ｋＶ及び予備の
無線回線Ｐｖ、ならびに、これ等各無線回線とそれぞれ
同じ周波数の水平偏波を用いる現用の無線回線ＩＨ−ｋ
Ｈ及び予備の無線回線ＰＨを使用する。各無線回線ＰＶ
、ＩＶ−ｋＶ。As shown in FIG. 2, the embodiment shown in FIG. Current wireless line IH-k that uses polarized waves
H and a spare wireless line PH are used. Each wireless line PV
, IV-kV.
ＰＨ，ＬＨ−ｋＨの送端ニハ送信機２０Ｖ 〜２ｋＶ。PH, LH-kH sending end Niha transmitter 20V ~ 2kV.
２０Ｈ〜２ｋＨがおかれ、受端には受信機３０Ｖ〜３ｋ
Ｖ、３０Ｈ〜３ｋＨがおかれている。送信機２０ｖ〜２
ｋｖ、２０Ｈ〜２ｋＨは送端回線切替装置１０に接続さ
れている。受信機３０Ｖ〜３ｋＶ及び３０Ｈ〜３ｋＨの
出力は交差偏波干渉除去装置４０〜４ｋに接続されてい
る。交差偏波干渉除去装置４０〜４にの出力は、フレー
ム同期装置５０Ｖ 〜５ｋＨ，５０Ｈ〜５ｋＨを介して
、受端回線切替装置６０に接続されている。20H to 2kHz is placed, and the receiver is 30V to 3K at the receiving end.
V, 30H to 3kHz are placed. Transmitter 20v~2
kv, 20H to 2kHz are connected to the sending end line switching device 10. The outputs of the receivers 30V to 3kV and 30H to 3kHz are connected to cross-polarization interference cancelers 40 to 4k. The outputs of the cross-polarization interference canceling devices 40 to 4 are connected to the receiving end line switching device 60 via frame synchronizers 50V to 5kHz and 50H to 5kHz.
送端回線切替装置１０は、送端の搬送端局装置（図示せ
ず）から入力した２に個のデータ信号にそれぞれフレー
ム同期ビット、パリティチエツクビットその他の付加ビ
ットを挿入して２に個のフレーム化した複合データ信号
をつくり、それぞれの複合データ信号を送信機２１Ｖ〜
２ｋＶ、２１Ｈ〜２ｋＨへ出力し、又、無線回線ＩＶ−
ｋＶ。The sending end line switching device 10 inserts frame synchronization bits, parity check bits, and other additional bits into two data signals inputted from a carrier end station device (not shown) at the sending end. Create a framed composite data signal and send each composite data signal to the transmitter 21V~
Output to 2kV, 21H to 2kHz, and wireless line IV-
kV.
ＩＨ−ｋＨのいずれかが正常でない場合は、回線切替制
御装置（図示せず）に制御されて、正常でない無線回線
の送信機へ出力している複合データ信号を送信機２０Ｖ
又は２０Ｈへも出力する。送信機２０Ｖ 〜２ｋＶ、２
０Ｈ〜２ｋＨは入力した複合データ信号でディジタル変
調した変調波を各無線回線へ送出する。これ等の変調波
は、無線回線ＰＶ、ＩＶ 〜ｋＶ、ＰＨ，ＩＨ−ｋＨで
伝送され、受信機３０Ｖ 〜３ｋＶ、３０Ｈ〜３ｋＨで
受信、復調されてベースバンド信号となる。If either IH-kH is not normal, it is controlled by a line switching control device (not shown) and the composite data signal output to the transmitter of the abnormal wireless line is switched to the transmitter 20V.
Or also output to 20H. Transmitter 20V ~ 2kV, 2
From 0H to 2kHz, a modulated wave digitally modulated with the input composite data signal is sent to each radio line. These modulated waves are transmitted via radio lines PV, IV to kV, PH, IH-kH, received and demodulated by receivers 30V to 3kV, 30H to 3kHz, and become baseband signals.
例えば、受信機３１Ｖが出力したベースバンド信号は無
線回線ＩＨが無線回線１ｖに与えた交差偏波干渉の成分
を含んでおり、受信機３１Ｈが出力したベースバンド信
号は無線回線１ｖが無線回線ＩＨに与えた交差偏波干渉
の成分を含んでいる。For example, the baseband signal output by the receiver 31V includes a component of cross-polarization interference given by the wireless line IH to the wireless line 1v, and the baseband signal output by the receiver 31H includes the component of cross-polarization interference given to the wireless line 1v by the wireless line IH. Contains components of cross-polarization interference caused by
交差偏波干渉除去装置４１は、受信機３１Ｖ及び３１Ｈ
から入力したそれぞれのベースバンド信号の交差偏波干
渉成分を除去し、交差偏波干渉成分を除去した各ベース
バンド信号を識別し、送信機２１Ｖ及び２１Ｈに入力し
た複合データ信号のそれぞれに対応する複合データ信号
をフレーム同期装置５１Ｖ及び５１Ｈへ出力する。交差
偏波干渉除去装置４０．４２〜４にの動作も以上説明し
た交差偏波干渉除去装置４１の動作と同様である。The cross-polarization interference canceling device 41 includes receivers 31V and 31H.
remove the cross-polarization interference component of each baseband signal input from the baseband signal, identify each baseband signal from which the cross-polarization interference component has been removed, and identify the baseband signal corresponding to each of the composite data signals input to the transmitters 21V and 21H. The composite data signal is output to frame synchronizers 51V and 51H. The operations of the cross-polarization interference canceling devices 40, 42 to 4 are also similar to the operations of the cross-polarization interference canceling device 41 described above.
交差偏波干渉除去装置４０〜４にとして、先に述べた特
開昭５５−１３３１５６号公報に記載されている装置を
使用できる。As the cross-polarization interference canceling devices 40 to 4, the device described in the above-mentioned Japanese Patent Laid-Open No. 133156/1983 can be used.
フレーム同期装置５ＱＶ 〜５ｋＶ、５０Ｈ〜５ｋＨは
、入力した複合データ信号にフレーム同期してパリティ
チエツクビットを検出し、このパリティチエツクビット
を用いてパリティチエツクをすることにより複合データ
信号が送られてきた無線回線の品質を監視し、品質があ
る限度を超えて劣化すると劣化検出信号を回線切替制御
装置へ出力する。受端回線切替装置６０は、フレーム同
期装置５０Ｖ 〜５ｋＶ、５０Ｈ〜５ｋＨな介して交差
偏波干渉除去装置４０〜４ｋから入力した複合データ信
号から付加ビットを抜取り、付加ビットを抜取ったデー
タ信号を、回線切替制御装置に制御されて、受端の搬送
端局装置（図示せず）へ出力する。無線回線１ｖ〜ｋＶ
、ＩＨ〜ｋＨのすべてが正常である場合、フレーム同期
装置５１Ｖ〜５ｋＶ、５１Ｈ〜５ｋＨが出力した複合デ
ータ信号から付加ビットを抜取った２に個のデータ信号
が受端の搬送局装置へ出力される。The frame synchronizer 5QV ~ 5kV, 50H ~ 5kHz detects a parity check bit in frame synchronization with the input composite data signal, and performs a parity check using this parity check bit to send a composite data signal. The quality of the wireless line is monitored, and when the quality deteriorates beyond a certain limit, a deterioration detection signal is output to the line switching control device. The receiving end line switching device 60 extracts additional bits from the composite data signal inputted from the cross-polarization interference canceling devices 40 to 4k via the frame synchronizers 50V to 5kV and 50H to 5kHz, and outputs a data signal from which the additional bits have been extracted. is output to a carrier end station device (not shown) at the receiving end under the control of a line switching control device. Wireless line 1v~kV
, IH to kH are all normal, the additional bits are extracted from the composite data signal output by the frame synchronizers 51V to 5kV and 51H to 5kHz, and the 2nd data signal is output to the carrier station equipment at the receiving end. be done.
無線回線ｌｖ〜ｋＶ、ＩＨ〜ｋＨのいずれか、例えば、
無線回線１ｖの品質が劣化した場合、フレーム同期装置
５１Ｖは劣化検出信号Ｓ１を出力する。回線切替制御装
置は、劣化検出信号Ｓ１が入力すると、フレーム同期装
置５１Ｈから劣化検出信号Ｓ２が入力していてもいなく
ても、送端回線切替装置１０を制御して送信機２１Ｖへ
出力している複合データ信号を送信機２０Ｖへも出力さ
せ、又、送信機２１Ｈの出力している複合データ信号を
送信機２１Ｈへも出力させる。続いて回線切替（転）脚
装置は、無線回線１ｖ及びＩＨ経由のデータ信号と同じ
データ信号が無線回線ＰＶ及びＰＨ経由でも届いている
ことを確認し、受端回線切替装置６０を制御してそれま
で出力していた無線回線１ｖ及びＩＨ経由のデータ信号
に代って無線回線ＰＶ及びＰＨ経由のデータ信号な受端
の搬送端局装置へ出力させる。この回線切替により、無
線回線１ｖの品質劣化の進行による回線断が救済され、
更に、無線回線１ｖの品質劣化により受信機１ｖの出力
したベースバンド信号から正常な情報が得られなくなり
、その結果、交差偏波干渉除去装置４１が正常に動作し
なくなり、除去できな゛い交差偏波干渉によって無線回
線ＩＨの品質が急速に劣化し回線断になるのも未然に防
止される。Wireless line lv~kV, IH~kH, for example,
When the quality of the wireless line 1v deteriorates, the frame synchronizer 51V outputs a deterioration detection signal S1. When the deterioration detection signal S1 is input, the line switching control device controls the sending end line switching device 10 and outputs the signal to the transmitter 21V, regardless of whether the deterioration detection signal S2 is input from the frame synchronizer 51H. The composite data signal output from the transmitter 21H is also output to the transmitter 20V, and the composite data signal output from the transmitter 21H is also output to the transmitter 21H. Next, the line switching (switching) leg device confirms that the same data signal as the data signal via the wireless line 1v and IH is also received via the wireless lines PV and PH, and controls the receiving end line switching device 60. Instead of the data signals via the radio line 1v and IH that had been output until then, the data signals via the radio lines PV and PH are output to the carrier end station device at the receiving end. This line switching relieves line disconnections due to progressing quality deterioration of the wireless line 1v,
Furthermore, due to the quality deterioration of the wireless line 1v, normal information cannot be obtained from the baseband signal output by the receiver 1v, and as a result, the cross-polarization interference canceling device 41 does not operate normally, and the cross-polarization interference that cannot be removed is Rapid deterioration of the quality of the wireless line IH due to polarization interference and disconnection of the line are also prevented.
無線回線２ｖ〜ｋＶ、ＩＨ〜ｋＨの品質が劣化した場合
も、上記の場合と同様に回線切替が行われる。Even when the quality of the wireless lines 2v to kV and IH to kH deteriorates, line switching is performed in the same way as in the above case.
なお、通常予備の無線回線への回線切替が開始される品
質劣化の程度、例えばビット誤り率にして１０−６、及
び、交差偏波干渉除去装置４０〜４ｋが正常に動作でき
なくなる直前の品質劣化の程度、例えばビット誤り率に
して１０−４の２段階で品質劣化信号８１．８２等が出
力さｈるようにすれば、例えば、無線回線１ｖの品質が
ビット誤り率１０１程度に劣化したとき、まず、無線回
線１■のみを無線回線Ｐｖに回線切替えし、無線回線１
ｖの品質が更に劣化してビット誤り率１０−４に達した
ら無線回線ＩＨも無線回線ＰＨに回線切替するようにも
できる。In addition, the degree of quality deterioration at which line switching to a backup wireless line is started, for example, 10-6 in terms of bit error rate, and the quality immediately before the cross-polarization interference canceling devices 40 to 4k cannot operate normally. If a quality degradation signal such as 81.82 is output in two stages of bit error rate of 10-4 depending on the degree of degradation, for example, the quality of wireless line 1v has degraded to a bit error rate of about 101. At this time, first, only wireless line 1■ is switched to wireless line Pv, and wireless line 1
If the quality of v deteriorates further and reaches a bit error rate of 10-4, the wireless line IH can also be switched to the wireless line PH.
また、第１図に示す実施例はフレーム同期装置が行うパ
リティチエツクによって無線回線の品質劣化の程度を検
出しているが、各無線回線で誤り訂正符号化を行ってい
る場合は、誤り訂正符号化装置で品質劣化を検出するこ
ともできる。In addition, in the embodiment shown in FIG. 1, the degree of quality deterioration of the wireless link is detected by a parity check performed by the frame synchronizer, but if error correction coding is performed on each radio link, error correction code It is also possible to detect quality deterioration using a deterioration device.
〔発明の効果〕 、
以上説明したように本発明は、直交する２偏波のそれぞ
れを用いる２つの無線回線のうち一方の品質が劣化する
と劣化の程度に応じて両無線回線を共に予備無線回線に
回線切替することにより、異偏波側の回線品質劣化で交
差偏波干渉除去装置が正常に動作しなくなることに起因
して起り得る自偏波側の゛瞬断を防止でき、データ信号
の伝送品質を向上できる効果がある。[Effects of the Invention] As explained above, the present invention provides that when the quality of one of two radio lines using two orthogonal polarized waves deteriorates, both radio lines are set as a backup radio line depending on the degree of deterioration. By switching the line to the same polarization side, it is possible to prevent momentary interruptions on the self-polarization side that may occur due to deterioration of the line quality on the side of the opposite polarization and the cross-polarization interference removal device not working properly, and to improve the data signal. This has the effect of improving transmission quality.
第１図は本発明の一実施例を示すブロック図、第２図は
第１図に示す実施例における各無線回線の偏波方向及び
周波数配置を示す説明図である。
ＩＨ〜ｋＨ，ＰＨ，ＩＶ 〜ｋＶ、ＰＶ−川−・無線回
用、１０・・・・・・送端回線切替装置、４０〜４ｋ・
・・・・・交差偏波干渉除去装置、５０Ｈ〜５ｋＨ，５
０■〜５ｋＶ・・・・・・フレーム同期装置、６ｏ・山
・・受端回線切替装置。
代理人 弁理士 内 原 晋FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the polarization direction and frequency arrangement of each radio line in the embodiment shown in FIG. IH~kH, PH, IV~kV, PV-River-・Radio circuit, 10......Sending end line switching device, 40-4k・
...Cross polarization interference removal device, 50H to 5kHz, 5
0~5kV... Frame synchronizer, 6o/mount... Receiving line switching device. Agent Patent Attorney Susumu Uchihara
Claims (1)
のディジタル無線回線と、この第１及び第２のディジタ
ル無線回線とは異る少くとも２つの第３のディジタル無
線回線と、前記第１及び第２のディジタル無線回線の受
信信号を復調して得た両方のベースバンド信号情報を基
にして前記第１のディジタル無線回線が前記第２のディ
ジタル無線回線に与えた交差偏波干渉及び前記第２のデ
ィジタル無線回線が前記第１のディジタル無線回線に与
えた交差偏波干渉を除去する交差偏波干渉除去装置と、
前記第１のディジタル無線回線の品質劣化の程度を検出
する第１の検出手段と、前記第２のディジタル無線回線
の品質劣化の程度を検出する第２の検出手段とを備える
偏波共用ディジタル無線伝送方式において、前記第１及
び第２の検出手段の少くとも一方が品質劣化を検出した
とき品質劣化の程度に応じて前記第１及び第２のディジ
タル無線回線を前記第３のディジタル無線回線に切替え
る回線切替装置を含むことを特徴とする偏波共用ディジ
タル無線伝送方式。first and second using mutually orthogonal first and second polarizations;
a digital radio line, at least two third digital radio lines different from the first and second digital radio lines, and a signal obtained by demodulating the received signals of the first and second digital radio lines. cross-polarization interference caused by the first digital radio line to the second digital radio line based on both baseband signal information and the cross-polarization interference caused by the second digital radio line to the first digital radio line. a cross-polarization interference removal device that removes the applied cross-polarization interference;
A polarization-sharing digital radio comprising a first detection means for detecting the degree of quality deterioration of the first digital radio line, and a second detection means for detecting the degree of quality deterioration of the second digital radio line. In the transmission system, when at least one of the first and second detection means detects quality deterioration, the first and second digital wireless lines are switched to the third digital wireless line depending on the degree of quality deterioration. A polarization-sharing digital wireless transmission system characterized by including a line switching device for switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10523088A JPH0683177B2 (en) | 1988-04-26 | 1988-04-26 | Polarization sharing digital wireless transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10523088A JPH0683177B2 (en) | 1988-04-26 | 1988-04-26 | Polarization sharing digital wireless transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01274534A true JPH01274534A (en) | 1989-11-02 |
| JPH0683177B2 JPH0683177B2 (en) | 1994-10-19 |
Family
ID=14401855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10523088A Expired - Fee Related JPH0683177B2 (en) | 1988-04-26 | 1988-04-26 | Polarization sharing digital wireless transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0683177B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05244116A (en) * | 1992-02-27 | 1993-09-21 | Nec Corp | Digital radio system for both polarized waves transmission system |
| JPH0614005A (en) * | 1992-06-24 | 1994-01-21 | Nec Corp | Active standby changeover device |
-
1988
- 1988-04-26 JP JP10523088A patent/JPH0683177B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05244116A (en) * | 1992-02-27 | 1993-09-21 | Nec Corp | Digital radio system for both polarized waves transmission system |
| JPH0614005A (en) * | 1992-06-24 | 1994-01-21 | Nec Corp | Active standby changeover device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0683177B2 (en) | 1994-10-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |