JPS6314531B2 - - Google Patents
Info
- Publication number
- JPS6314531B2 JPS6314531B2 JP57216640A JP21664082A JPS6314531B2 JP S6314531 B2 JPS6314531 B2 JP S6314531B2 JP 57216640 A JP57216640 A JP 57216640A JP 21664082 A JP21664082 A JP 21664082A JP S6314531 B2 JPS6314531 B2 JP S6314531B2
- Authority
- JP
- Japan
- Prior art keywords
- reception
- combining
- receiving means
- interference
- agc
- 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
Links
- 238000000034 method Methods 0.000 description 18
- 238000004891 communication Methods 0.000 description 7
- 230000003044 adaptive effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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
- H04B7/0837—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 pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Radio Transmission System (AREA)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は、無線通信の受信方式に関し、特にス
ペースダイバーシチ最大比合成（Maximal
Ratio Combine）受信およびECCM（Electric
Counter Counter Measure：対妨害）受信の両
機能を備えた受信方式に関するものである。[Detailed Description of the Invention] [Technical field to which the invention pertains] The present invention relates to a wireless communication reception system, and in particular to space diversity maximum ratio combining (Maximal ratio combining).
Ratio Combine) reception and ECCM (Electric
This relates to a reception method that has both counter counter measurement (anti-jamming) reception functions.
スペースダイバーシチ受信を必要とする無線通
信回線においては、強力な妨害波または干渉波の
存在が予想される場合には、スペースダイバーシ
チ合成機能の他に、妨害波除去を積極的に行うい
わゆるECCM機能を合わせ持つ受信方式の採用
が望まれる。
In wireless communication lines that require space diversity reception, if the presence of strong jamming waves or interference waves is expected, in addition to the space diversity combining function, a so-called ECCM function that actively removes the interference waves is used. It is desirable to adopt a reception method that has both.
この対妨害強度の改善を目的とする従来技術
は、概略
SS（Spread Spectram）技術を用いた通信方
式
アダプテイブ・アレー（Adaptive Array）
技術を用いた受信方式
に分類される。は対妨害強度を増すために通信
方式自体を変える方法であり、原理式にはすぐれ
ているが、既存のFDM（周波数分割多重）方式お
よびTDM（時分割多重）方式と比較して非常な
広帯域性を必要とするため適用が困難な場合が多
い。は受信方式を工夫することによつて適応的
に妨害波を除去しようとするものであり、限界は
あるが、実用性、経済性の面ですぐれている。し
たがつて、こののアダプテイブ・アレー技術を
適用可能にしたスペース・ダイバーシチ受信方式
が望まれるが、従来、このような受信方式は知ら
れていない。 Conventional technologies aimed at improving this anti-jamming strength are: Communication methods using SS (Spread Spectram) technology Adaptive Array
It is classified as a reception method that uses technology. is a method of changing the communication method itself in order to increase the anti-jamming strength, and although it is superior in principle, it requires a very wide band compared to the existing FDM (frequency division multiplexing) and TDM (time division multiplexing) methods. It is often difficult to apply because it requires specificity. This method attempts to adaptively remove interference waves by devising a receiving method, and although it has its limitations, it is excellent in terms of practicality and economy. Therefore, a space diversity reception system is desired to which this adaptive array technology can be applied, but such a reception system has not been known in the past.
本発明の目的は、妨害波や干渉波が無視できる
通常の場合はスペースダイバーシチ最大比合成受
信を行い、強力な妨害波や干渉波が加えられた場
合には、妨害波除去受信を行つて、通信不能とな
る割合を可及的に減少させる経済的な受信方式を
提供することにある。
The purpose of the present invention is to perform space diversity maximum ratio combining reception in normal cases where jamming waves and interference waves can be ignored, and to perform jamming wave elimination reception when strong jamming waves and interference waves are added. The object of the present invention is to provide an economical reception method that reduces the rate of communication failure as much as possible.
本発明は、対妨害受信としては、アダプテイ
ブ・アレー技術を用いた受信方式に属するもので
あり、スペースダイバーシチ最大比合成受信方式
を拡張して、アダプテイブ・アレーと同様の対妨
害受信も可能とした受信方式である。
The present invention belongs to a reception method using adaptive array technology for anti-jamming reception, and extends the space diversity maximum ratio combining reception method to enable anti-jamming reception similar to adaptive array. This is a reception method.
そして本発明の特徴とするところは、スペース
ダイバーシチ最大比合成受信を目的とした信号の
処理回路において、各受信回路増幅器の自動利得
制御（AGC）を共通AGCと独立AGCとに切り替
える切替手段と、各ダイバーシチ信号を同相に合
成する加算器に加えられる各ダイバーシチパスの
信号を分岐してこれらの信号を妨害波が除去され
るように合成し、その出力の振幅を一定に保つ手
段とを備え、切替手段により共通AGCを独立
AGCに切り替えることによつて対妨害受信を行
えるように構成したことにある。 The present invention is characterized in that, in a signal processing circuit for space diversity maximum ratio combined reception, switching means switches automatic gain control (AGC) of each receiving circuit amplifier between common AGC and independent AGC; means for branching the signals of each diversity path applied to an adder that combines each diversity signal in phase, combining these signals so that interference waves are removed, and keeping the amplitude of the output constant; Common AGC is made independent by switching means
The structure is such that anti-jamming reception can be performed by switching to AGC.
次に本発明の実施例方式を図面を参照して詳細
に説明する。
Next, embodiments of the present invention will be described in detail with reference to the drawings.
図は本発明によるECCM機能を備えたスペー
スダイバーシチ最大比合成受信方式の主要部信号
処理回路のブロツク構成図である。 The figure is a block diagram of the main signal processing circuit of the space diversity maximum ratio combining reception system equipped with the ECCM function according to the present invention.
図において、スペースダイバーシチ・アンテナ
および受信周波数変換回路等は省略されている
が、入力端子IN−１および入力端子IN−２に
は、それぞれ２基のスペースダイバーシチ・アン
テナで受信されて周波数変換回路によつて中間周
波に変換されたスペースダイバーシチ受信信号が
入力される。 In the figure, space diversity antennas, reception frequency conversion circuits, etc. are omitted, but input terminal IN-1 and input terminal IN-2 each receive signals from two space diversity antennas and are sent to the frequency conversion circuit. Thus, the space diversity received signal converted to an intermediate frequency is input.
１０および２０は中間周波増幅器で、それぞれ
出力V1およびV2を出力する。１１および２１は
それぞれ中間周波増幅器１０，２０のAGC（自動
利得制御）増幅器、１２および２２はAGC増幅
器１１または２１のどちらかAGC電圧の大きい
側のAGC電圧を中間周波増幅器１０および２０
に共通に加えるためのOR回路を構成するダイオ
ードである。５０はAGC増幅器１１および２１
を共通AGCまたは独立AGCとして動作させるた
めの切替スイツチであり、この切替スイツチ５０
を閉じたときには共通AGCとなつてスペースダ
イバーシチ最大比合成受信が行われ、また開いた
ときには独立AGCとなつて妨害波除去受信が行
われる。 10 and 20 are intermediate frequency amplifiers that output outputs V 1 and V 2 , respectively. 11 and 21 are AGC (automatic gain control) amplifiers of the intermediate frequency amplifiers 10 and 20, respectively; 12 and 22 are AGC voltages of the AGC amplifiers 11 and 21, whichever has the larger AGC voltage, and are connected to the intermediate frequency amplifiers 10 and 20;
This is a diode that constitutes an OR circuit for adding in common to both. 50 is AGC amplifier 11 and 21
This is a changeover switch for operating the AGC as a common AGC or an independent AGC, and this changeover switch 50
When closed, it functions as a common AGC and performs space diversity maximum ratio combining reception, and when it is open, it functions as an independent AGC and performs interference rejection reception.
１３および２３は遅延回路、１４および２４は
複素共役回路、１５および２５は複素相関器、１
６および２６は低周波波器（LPF）であり、
この低周波波器１６，２６はそれぞれ出力W1，
W2を出力する。１７および２７は複素４象限乗
算器であり、３０は最大比合成受信のためにこの
複素４象限乗算器１７および２７の出力を加算し
て出力V3を出力する加算器である。３１は中間
周波増幅器であつて、出力端子OUT−１に最大
比合成出力Vnを出力する。３２はAGC増幅器で
ある。 13 and 23 are delay circuits, 14 and 24 are complex conjugate circuits, 15 and 25 are complex correlators, 1
6 and 26 are low frequency filters (LPF),
The low frequency wave generators 16 and 26 have outputs W 1 and 26 , respectively.
Output W 2 . 17 and 27 are complex four-quadrant multipliers, and 30 is an adder that adds the outputs of the complex four-quadrant multipliers 17 and 27 to output an output V 3 for maximum ratio combining reception. 31 is an intermediate frequency amplifier which outputs the maximum ratio composite output V n to the output terminal OUT-1. 32 is an AGC amplifier.
また、４０は妨害波除去受信のために複素４象
限乗算器１７と２７の出力の差をとり出力V4を
出力する減算器である。４１は中間周波増幅器で
あつて、出力端子OUT−２に妨害波除去出力Va
を出力する。４２はAGC増幅器である。 Further, 40 is a subtracter that takes the difference between the outputs of the complex four-quadrant multipliers 17 and 27 and outputs an output V 4 for interference wave removal reception. 41 is an intermediate frequency amplifier, and output terminal OUT-2 has an interference wave removal output V a
Output. 42 is an AGC amplifier.
本方式の動作原理は次のとおりである。 The operating principle of this method is as follows.
中間周波増幅器１０，２０の出力V1，V2はそ
れぞれ希望波S1，S2と妨害波X2，X2の和と考え
られ、受信機の熱雑音を十分小さいものとして無
視すると、
V1＝S1＋X1 ……(1)
V2＝S2＋X2 ……(2)
となる。なお、希望波と妨害波は無相関であると
する。 The outputs V 1 and V 2 of the intermediate frequency amplifiers 10 and 20 can be considered as the sum of the desired waves S 1 and S 2 and the interference waves X 2 and X 2 , respectively, and if the thermal noise of the receiver is ignored as being sufficiently small, V 1 = S 1 + X 1 ... (1) V 2 = S 2 + X 2 ... (2). It is assumed that the desired wave and the interference wave are uncorrelated.
最大比合成の動作は、切替スイツチ５０を閉じ
て中間周波増幅器１０，２０を共通AGCとする
ことによつて行われ、出力端子OUT−１の出力
Vnがその最大比合成出力となる。 The maximum ratio combining operation is performed by closing the changeover switch 50 and making the intermediate frequency amplifiers 10 and 20 a common AGC, and the output from the output terminal OUT-1 is
V n becomes its maximum ratio composite output.
妨害波X1，X2に比べて希望波が十分に大きい
とき、すなわち、
S1≫X1、S2≫X2
の場合には、出力Vnも希望波が支配的となり、
妨害波は無視できる。出力Vnの振幅は中間周波
増幅器３１およびAGC増幅器３２によつて１に
正規化されるとし、出力Vnの位相を基準（複素
平面上の実軸）にとると、
Vn＝１ ……(3)
となるので、定常状態において、低周波波器１
６および２６の出力W1およびW2は、
W1＝S1 *・１＝S1 * ……(4)
W2＝S2 *・１＝S2 * ……(5)
ただし、S1 *，S2 *はそれぞれS1，S2と複素共役
な数である。 When the desired wave is sufficiently large compared to the interference waves X 1 and X 2 , that is, when S 1 ≫X 1 and S 2 ≫X 2 , the output V n is also dominated by the desired wave,
Interference waves can be ignored. Assuming that the amplitude of the output V n is normalized to 1 by the intermediate frequency amplifier 31 and the AGC amplifier 32, and taking the phase of the output V n as a reference (real axis on the complex plane), V n = 1... (3) Therefore, in steady state, the low frequency generator 1
The outputs W 1 and W 2 of 6 and 26 are W 1 =S 1 *・1=S 1 * ……(4) W 2 =S 2 *・1=S 2 * ……(5) However, S 1 * , S 2 * are numbers that are complex conjugates of S 1 and S 2 , respectively.
となる。したがつて加算器３０の出力V3は、
V3＝W1V1＋W2V2＝S1 *（S1＋X1）＋S2 *（S2＋X2）＝（S1
*S1＋S2 *S2）＋（S1 *X1＋S2 *X2）……(6)
となり、これは希望波についての最大比合成とな
る。becomes. Therefore, the output V 3 of the adder 30 is: V 3 = W 1 V 1 + W 2 V 2 = S 1 * (S 1 +X 1 ) + S 2 * (S 2 +X 2 ) = (S 1
* S 1 + S 2 * S 2 ) + (S 1 * X 1 + S 2 * X 2 )...(6), which is the maximum ratio combination of the desired waves.
次に、妨害波が無視できなくなるとW1，W2に
妨害波に関する相関出力が現れてくるので(6)式の
希望波についての最大比合成は乱されることにな
り、妨害波除去受信が必要となる。 Next, when the interference wave can no longer be ignored, correlation outputs related to the interference wave appear in W 1 and W 2 , so the maximum ratio synthesis for the desired signal in equation (6) is disturbed, and interference wave removal reception Is required.
妨害波除去の動作は、切替スイツチ５０を開放
して中間周波増幅器１０，２０を独立AGCにす
ることによつて行われ、出力端子OUT−２の出
力Vaがその妨害波除去出力となる。 The interference wave removal operation is performed by opening the changeover switch 50 and making the intermediate frequency amplifiers 10 and 20 independent AGC, and the output V a of the output terminal OUT-2 becomes the interference wave removal output.
妨害波X1，X2が大きいとき、すなわち、
X1≫S1、X2≫S2
の場合には、出力Vn側は妨害波が支配的となり、
希望波は無視できる。このとき、低周波波器１
６および２６の出力W1およびW2は、上記最大比
合成動作の場合から類推して、定常状態におい
て、
W1＝X1 *・１＝X1 * ……(7)
W2＝X2 *・１＝X2 * ……(8)
ただし、X1 *，X2 *はそれぞれX1，X2と複素共
役な数である。 When the interference waves X 1 and X 2 are large, that is, when X 1 ≫S 1 and X 2 ≫S 2 , the interference waves become dominant on the output V n side,
Hope waves can be ignored. At this time, low frequency wave generator 1
By analogy with the case of the maximum ratio combining operation described above, the outputs W 1 and W 2 of 6 and 26 are as follows in the steady state: W 1 =X 1 *・1=X 1 * ……(7) W 2 =X 2 *・1=X 2 * (8) However, X 1 * and X 2 * are numbers that are complex conjugates of X 1 and X 2 , respectively.
となる。したがつて減算器４０の出力V4は、
V4＝W1V1＋W2V2＝X1 *（S1＋X1）−X2 *（S2＋X2）＝（X1
*S1＋X2 *S2）＋（X1 *X1−X2 *X2）……(9)
となるが、第２項は、増幅器１０，１１および増
幅器２０，２１がそれぞれ独立にAGC動作を行
うので、
｜X1｜＝｜X2｜
とすることができ、零となる。この動作はアダプ
テイブ・アレーと同様のものであり、中間周波増
幅器１０，２０の出力V1およびV2の希望波と妨
害波との比が等しく、希望波間の位相差と妨害波
間の位相差とが等しい、すなわち希望波と妨害波
の到来方向が等しい場合以外は妨害波を除去して
ECCM受信ができることを示している。becomes. Therefore, the output V 4 of the subtractor 40 is: V 4 =W 1 V 1 +W 2 V 2 =X 1 * (S 1 +X 1 )−X 2 * (S 2 +X 2 )=(X 1
* S 1 + X 2 * S 2 ) + (X 1 * X 1 −X 2 * Since AGC operation is performed, |X 1 |= |X 2 |, which becomes zero. This operation is similar to that of an adaptive array, in which the ratios of the desired waves and the interference waves of the outputs V 1 and V 2 of the intermediate frequency amplifiers 10 and 20 are equal, and the phase difference between the desired waves and the phase difference between the interference waves is equal. are equal, that is, the directions of arrival of the desired wave and the interference wave are the same, the interference wave is removed.
Indicates that ECCM reception is possible.
以上の説明は、２重スペースダイバーシチにつ
いて説明したが、減算器４０を変形することによ
つて、容易にｎ重スペースダイバーシチに拡散で
きる。また、切替スイツチ５０の開閉制御は手
動、自動のどちらによつても行える。 Although the above explanation has been about double space diversity, by modifying the subtractor 40, it is easy to spread to n-fold space diversity. Moreover, the opening/closing control of the changeover switch 50 can be performed either manually or automatically.
以上説明したように、本発明の受信方式を用い
ることによつて、スペースダイバーシチ受信を必
要とする無線通信回線において、妨害波または干
渉波が無止できる通常時には、スペースダイバー
シチ最大比合成受信を行い、妨害波または干渉波
が無視できなくなつた場合には、妨害波除去受信
を行うことができ、これにより本方式を適用しな
い受信方式と比較して通信不能となる割合を飛躍
的に減少させることができる。また本方式は、
FDM−FM（周波数分割多重・周波数変調）方式
にも、TDM（時分割多重）方式にも適用できる
こと、ECCM受信のための付加回路が少なく経
済性にすぐれていること、また制御が負帰還でな
く正帰還となつているので安定性にすぐれている
こと等の特長を有する。
As explained above, by using the reception method of the present invention, space diversity maximum ratio combining reception can be performed in a wireless communication line that requires space diversity reception in normal times when jamming waves or interference waves can be eliminated. , when the jamming waves or interference waves can no longer be ignored, interference wave removal reception can be performed, which dramatically reduces the rate of communication failures compared to reception methods that do not apply this method. be able to. In addition, this method
It can be applied to both FDM-FM (Frequency Division Multiplexing/Frequency Modulation) and TDM (Time Division Multiplexing) systems, requires less additional circuitry for ECCM reception, is highly economical, and can be controlled using negative feedback. It has features such as excellent stability because it has positive feedback without any noise.
図は本発明によるECCM機能を備えたスペー
スダイバーシチ最大比合成受信方式の主要部信号
処理回路を示すブロツク構成図。
１０，２０，３１，４１……中間周波増幅器、
１１，２１，３２，４２……AGC増幅器、１４，
２４……複素共役回路、１７，２７……複素４象
限乗算器、３０……加算器、４０……減算器、５
０……切替スイツチ。
The figure is a block configuration diagram showing the main signal processing circuit of a space diversity maximum ratio combining reception system equipped with an ECCM function according to the present invention. 10, 20, 31, 41... intermediate frequency amplifier,
11, 21, 32, 42...AGC amplifier, 14,
24...Complex conjugate circuit, 17, 27...Complex four-quadrant multiplier, 30...Adder, 40...Subtractor, 5
0...Switch.
Claims (1)
信手段を備え、これら複数の受信手段の増幅器を
共通的に自動利得制御することにより各受信手段
からダイバーシチ信号を得て、この各ダイバーシ
チ信号を第１の合成手段で同相に合成することに
よりスペースダイバーシチ最大比合成を行う受信
方式において、 上記各受信手段の増幅器の自動利得制御を共通
制御で行うモードと各受信手段毎に単独の独立制
御で行うモードに切り替える切替手段と、 上記第１の合成手段に加えられる各ダイバーシ
チ信号を分岐してこれらのダイバーシチ信号を妨
害波が除去されるように合成する第２の合成手段
と を備え、 妨害波のレベルが大きいとき上記切替手段が利
得制御を単独に行うモードに切り替えられるよう
に構成されたことを特徴とする対妨害受信機能を
備えたスペースダイバーシチ受信方式。[Claims] 1. A plurality of receiving means for performing space diversity are provided, and a diversity signal is obtained from each receiving means by common automatic gain control of the amplifiers of these plurality of receiving means, and each diversity signal is obtained from each receiving means. In a receiving system that performs space diversity maximum ratio combining by combining signals in phase with the first combining means, there is a mode in which automatic gain control of the amplifiers of each receiving means is performed under common control, and a mode in which automatic gain control of the amplifiers of each receiving means is performed independently, and a mode in which automatic gain control is performed independently for each receiving means. comprising a switching means for switching to a control mode, and a second combining means for branching each diversity signal applied to the first combining means and combining these diversity signals so that interference waves are removed, A space diversity reception system having an anti-interference reception function, characterized in that the switching means is configured to switch to a mode in which gain control is performed independently when the level of interference waves is large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216640A JPS59105727A (en) | 1982-12-09 | 1982-12-09 | Space diversity receiving system containing anti-disturbance receiving function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57216640A JPS59105727A (en) | 1982-12-09 | 1982-12-09 | Space diversity receiving system containing anti-disturbance receiving function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59105727A JPS59105727A (en) | 1984-06-19 |
| JPS6314531B2 true JPS6314531B2 (en) | 1988-03-31 |
Family
ID=16691603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57216640A Granted JPS59105727A (en) | 1982-12-09 | 1982-12-09 | Space diversity receiving system containing anti-disturbance receiving function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59105727A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05102867A (en) * | 1991-09-17 | 1993-04-23 | Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk | Interference wave reducing and receiving system |
| JP3632535B2 (en) | 1999-12-15 | 2005-03-23 | 日本電気株式会社 | Diversity transmission / reception method and apparatus |
| JP6320341B2 (en) * | 2015-04-08 | 2018-05-09 | 三菱電機株式会社 | Receiving machine |
-
1982
- 1982-12-09 JP JP57216640A patent/JPS59105727A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59105727A (en) | 1984-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2036078C (en) | Sub-band acoustic echo canceller | |
| US6097773A (en) | Co-channel interference reduction | |
| CA1235751A (en) | One frequency repeater for a digital microwave radio system with cancellation of transmitter-to-receiver interference | |
| US4670885A (en) | Spread spectrum adaptive antenna interference canceller | |
| US4575862A (en) | Cross-polarization distortion canceller for use in digital radio communication receiver | |
| JPH07508635A (en) | Using Diversity Transmission to Relax Adjacent Channel Requirements within Mobile Telephone Systems | |
| JPH09321526A (en) | Adaptive array antenna | |
| US5355533A (en) | Method and circuit for radio frequency signal detection and interference suppression | |
| JP2980053B2 (en) | Interference wave canceller | |
| WO2011072305A1 (en) | Low-complexity diversity using preequalization | |
| US6741838B2 (en) | Method and device for diversity transmission/reception | |
| JPS5845217B2 (en) | Method for removing interference distortion that occurs in demodulated signals due to interference between FM wave signals | |
| JPS6314531B2 (en) | ||
| JP2765377B2 (en) | Interference wave canceller | |
| JP2894088B2 (en) | Interference wave canceller | |
| US5678218A (en) | Circuit for removing random FM noise | |
| JP3385996B2 (en) | Diversity receiver | |
| JPH04150320A (en) | Diversity receiver | |
| US4355419A (en) | Radio signal receiving system having means for selectively combining signals from a plurality of receiving sections | |
| JP2806921B2 (en) | Diversity receiver for spread spectrum communication system. | |
| JPH04150113A (en) | Superdiversity system | |
| EP1289157A1 (en) | Linear phase compander for FM broadcast | |
| JP3337274B2 (en) | Mobile communication system | |
| JPS58123251A (en) | Pass-band optimum ratio synthesizing and reception system equipped with interference wave eliminating function | |
| JP3169982B2 (en) | Wireless receiver |