JPS6113649B2 - - Google Patents
Info
- Publication number
- JPS6113649B2 JPS6113649B2 JP54161449A JP16144979A JPS6113649B2 JP S6113649 B2 JPS6113649 B2 JP S6113649B2 JP 54161449 A JP54161449 A JP 54161449A JP 16144979 A JP16144979 A JP 16144979A JP S6113649 B2 JPS6113649 B2 JP S6113649B2
- Authority
- JP
- Japan
- Prior art keywords
- level
- distortion component
- nonlinear
- perturbation
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 230000003094 perturbing effect Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3276—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using the nonlinearity inherent to components, e.g. a diode
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3252—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using multiple parallel paths between input and output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2201/00—Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
- H03F2201/32—Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
- H03F2201/3227—Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier
Description
【発明の詳細な説明】
本発明はプリデイストーシヨン非線形補償法や
ポストデイストーシヨン非線形補償法などにおい
て、非線形補償特性を自動的に安定化する装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically stabilizes nonlinear compensation characteristics in a predistortion nonlinear compensation method, a postdistortion nonlinear compensation method, or the like.
負帰還法が適用できない高周波帯増幅器の非線
形補償法としてプリデイストーシヨン法や、ポス
トデイストーシヨン法が知られている。これら非
線形補償法は最適補償点に動作点が設定されれば
広帯域ダイナミツクレンジに渡つて非線形補償特
性を実現できるが、補償回路と被補償回路が独立
なため、夫々の電気的特性に変動が生ずると非線
形特性が劣化する欠点がある。この非線形補償特
性の安定性を確保する方法として特開昭55−
107308号公報のように信号自体から発生する非線
形ひずみ雑音を特性狭帯域において検出し、その
検出値が最小なるように非線形補償回路の特性を
自動制御する方法がある。しかし、この方法は入
力信号の平均レベルが変動する場合には制御が不
能となるため、そのような信号を伝送する通信系
に適用できない欠点がある。 A pre-distortion method and a post-distortion method are known as nonlinear compensation methods for high frequency band amplifiers to which the negative feedback method cannot be applied. These nonlinear compensation methods can achieve nonlinear compensation characteristics over a wide dynamic range if the operating point is set at the optimal compensation point, but since the compensation circuit and the compensated circuit are independent, the electrical characteristics of each may vary. If this occurs, there is a drawback that nonlinear characteristics deteriorate. As a method to ensure the stability of this nonlinear compensation characteristic,
There is a method, as disclosed in Japanese Patent No. 107308, in which nonlinear distortion noise generated from the signal itself is detected in a characteristic narrow band, and the characteristics of a nonlinear compensation circuit are automatically controlled so that the detected value is minimized. However, this method cannot be controlled when the average level of the input signal fluctuates, so it has the disadvantage that it cannot be applied to communication systems that transmit such signals.
従つて本発明は従来の技術の上記欠点を改善す
るもので、その目的は入力信号の平均電力レベル
が時間的に変動するような場合にも適用可能な自
動追従形非線形補償装置を提供することにあり、
その特徴は出力特性が入力に対し２次以上の高次
特性を示し、その位相と振幅を独立に制御可能な
付加回路が非線形補償のために被補償系に直列に
挿入される系において、入力信号に予め周波数の
異なる２波以上のパイロツト信号を注入する注入
手段と、被補償系出力信号において前記注入手段
により注入されたパイロツト信号から発生する相
互変調ひずみ成分を検出する検出手段と、該検出
手段により検出されたひずみ成分のレベルを記憶
する記憶手段と、前記高次特性の振幅と位相を可
変減衰器と可変移相器により摂動し、摂動後に検
出される相互変調ひずみ成分のレベルを前記記憶
手段に記憶されたひずみ成分レベルと比較する比
較手段と、該比較手段の比較結果に基づき摂動後
のひずみ成分のレベルが減少するごとく前記可変
減衰器または前記可変移相器の調整点を摂動する
ことにより次の摂動方向を決定する手段とを具備
する自動追従形非線形補償装置にある。以下図面
により実施例を説明する。 Therefore, the present invention aims to improve the above-mentioned drawbacks of the prior art, and its purpose is to provide an automatic tracking type nonlinear compensator that can be applied even when the average power level of an input signal fluctuates over time. Located in
Its feature is that the output characteristic exhibits a second-order or higher-order characteristic with respect to the input, and an additional circuit that can independently control the phase and amplitude is inserted in series in the compensated system for nonlinear compensation. An injection means for injecting two or more pilot signals of different frequencies into a signal in advance; a detection means for detecting an intermodulation distortion component generated from the pilot signal injected by the injection means in a compensated system output signal; storage means for storing the level of the distortion component detected by the means; and a storage means for perturbing the amplitude and phase of the high-order characteristic by a variable attenuator and a variable phase shifter, and storing the level of the intermodulation distortion component detected after the perturbation by the a comparison means for comparing the level of the distortion component stored in the storage means; and based on the comparison result of the comparison means, perturbing the adjustment point of the variable attenuator or the variable phase shifter so that the level of the distortion component after perturbation decreases. and means for determining the next perturbation direction by performing the following steps. Examples will be described below with reference to the drawings.
第１図は本発明による実施例であつて、３次相
互変調ひずみ雑音の改善を目的としたプリデイス
トーシヨン非線形補償法に対する適用例である。
図中、参照番号１は信号入力ポート、２は帯域阻
止波器、３及び１０は電力分配器、８は電力合
成器、４は遅延線路、５は入出力３乗特性回路、
６は可変移相器、７は可変減衰器、９は被補償増
幅器、１１は信号出力ポート、１２は非線形ひず
み検出器、１３は非線形特性制御器、１４はパイ
ロツト検出器である。またａ〜ｂ間の点線で囲ま
れた部分はプリデイストーシヨン非線形補償回路
１５を構成している（特開昭54−27341号公報）。
本装置の概略的な動作は、帯域阻止波器２によ
り特定狭帯域の雑音成分を予め十分に除去してお
き、被補償増幅器出力部に備えられたひずみ検出
器１２を用いて、２波以上のパイロツト信号から
発生し、その特定狭帯域に落ち込む相互変調ひず
み成分を検出し、それが最少となるようにプリデ
イストーシヨン非線形補償回路で注入するひずみ
成分の振幅と位相を非線形特性制御器１３によつ
て自動的に制御するものである。 FIG. 1 shows an embodiment of the present invention, which is an example of application to a predistortion nonlinear compensation method aimed at improving third-order intermodulation distortion noise.
In the figure, reference number 1 is a signal input port, 2 is a band-elimination filter, 3 and 10 are power dividers, 8 is a power combiner, 4 is a delay line, 5 is an input/output cube characteristic circuit,
6 is a variable phase shifter, 7 is a variable attenuator, 9 is a compensated amplifier, 11 is a signal output port, 12 is a nonlinear distortion detector, 13 is a nonlinear characteristic controller, and 14 is a pilot detector. Further, the portion surrounded by the dotted line between a and b constitutes a predistortion nonlinear compensation circuit 15 (Japanese Patent Laid-Open No. 54-27341).
The general operation of this device is to sufficiently remove noise components in a specific narrow band using a band-stop filter 2, and then use a distortion detector 12 provided at the output section of the compensated amplifier to detect two or more waves. A nonlinear characteristic controller 13 detects the intermodulation distortion component generated from the pilot signal of the signal and falls in that specific narrow band, and controls the amplitude and phase of the distortion component to be injected by the predistortion nonlinear compensation circuit so that the intermodulation distortion component is minimized. It is automatically controlled by
以下、本装置の動作を信号径路に沿つて詳細に
説明する。第２図に等振幅で周波数の異なる２本
の連続波から成るパイロツト信号とそれらが非線
形回路に入力されることにより生ずる相互変調ひ
ずみ成分のスペクトラムを示す。図中、周波数
p1，P2がパイロツト信号、２p1−P2、２
P2−p1が３次相互変調ひずみ成分である。これ
ら２本のパイロツト信号が入力信号として、第１
図の系に入力されると、まず帯域阻止波器２に
より、２p1−P2または、２P2−p1いずれ
か一方、ここでは２p1−P2とすれば、その特
定周波数の狭帯域について雑音成分が十分に除去
される。次にプリデイストーシヨン回路により３
次相互変調ひずみ成分が発生し、つづいて被補償
増幅器によつてさらに同一周波数の３次相互変調
ひずみ成分が発生する。これらプリデイストーシ
ヨン回路と被補償増幅器が発生するひずみ成分は
被補償増幅器出力において互いに打ち消し合うよ
うに可変減衰器７と可変移相器６によりレベルと
位相が調整されている。しかしこれら２つのひず
みの相殺が不完全な場合、ひずみ検出器１２によ
つて３次相互変調ひずみ成分（周波数２p1−
P2）が検出される。非線形特性制御１３は、この
検出された、ひずみ成分が特定レベル以上の場
合、可変減衰器または可変移相器の調整点を摂動
し、その結果として生ずる３次相互変調ひずみ成
分（周波数２p1−P2）の検出レベルの増減を
検知することにより、可変減衰器７または可変移
相器６の調整方向として、検出されるひずみ成分
が減少するような方向を見出し、ひずみの検出レ
ベルの最小点、すなわち最適補償点は、プリデイ
ストーシヨン回路の特性を調整する機能を有す
る。このような機能を実現するために、非線形特
性制御器はマイクロプロセツサの如き論理回路に
よつて構成される。このようにして最適点が設定
されれば、系は(i)特定時間、または(ii)ひずみの検
出レベルが特定レベル以上になるまで、または(iii)
ひずみ発生のためのパイロツト信号が再び入力信
号として系に挿入されるまで、制御を休止する。
プリデイストーシヨン回路は一度最適点にその動
作点が調整されれば、温度変動、電源変動、長期
特性変化等により、その最適補償状態がくずれる
まで、つまり次の制御開始まで、広帯域、広ダイ
ナミツクレンジに渡つて良好に非線形補償を行う
ため、極めて高安定なひずみ補償特性が実現され
る。以上の動作の際、ひずみ発生用パイロツトの
挿入法として、(1)第３図に示すように、情報信号
の空帯域に２波以上の連続波を挿入する：又は(2)
予備回線を利用し、予備回線用信号を兼用して２
波以上の連続波を挿入する、を用いる。(2)の場合
非線形特性の制御は、予備回線に用いられている
中継器に関してのみ行なわれるもので、特定の周
期で現用回線と予備回線を切り換えることにより
全中継器の非線形特性制御が実行される。 The operation of this device will be explained in detail below along the signal path. FIG. 2 shows a pilot signal consisting of two continuous waves of equal amplitude and different frequencies, and the spectrum of intermodulation distortion components generated when these signals are input to a nonlinear circuit. In the figure, frequency
p 1 , P 2 are pilot signals, 2p 1 −P 2 , 2
P 2 −p 1 is the third-order intermodulation distortion component. These two pilot signals are input to the first
When input to the system shown in the figure, first, the band-stop filter 2 outputs either 2p 1 - P 2 or 2P 2 - p 1 , here 2p 1 - P 2 , then the narrow band of that particular frequency is The noise components are sufficiently removed. Next, the predistortion circuit
A first-order intermodulation distortion component is generated, followed by a further third-order intermodulation distortion component of the same frequency by the compensated amplifier. The level and phase of the distortion components generated by the predistortion circuit and the compensated amplifier are adjusted by the variable attenuator 7 and the variable phase shifter 6 so that they cancel each other out at the output of the compensated amplifier. However, if the cancellation of these two distortions is incomplete, the distortion detector 12 detects the third-order intermodulation distortion component (frequency 2p 1 -
P 2 ) is detected. If the detected distortion component is above a specific level, the nonlinear characteristic control 13 perturbs the adjustment point of the variable attenuator or variable phase shifter, and the resulting third-order intermodulation distortion component (frequency 2p 1 - By detecting an increase or decrease in the detection level of P2 ), the direction in which the detected distortion component decreases is found as the adjustment direction of the variable attenuator 7 or the variable phase shifter 6, and the minimum point of the detection level of distortion is found. , that is, the optimum compensation point has the function of adjusting the characteristics of the predistortion circuit. In order to realize such a function, the nonlinear characteristic controller is constituted by a logic circuit such as a microprocessor. Once the optimal point is set in this way, the system will operate (i) for a specific time, or (ii) until the detected level of strain exceeds a specific level, or (iii)
Control is suspended until the pilot signal for strain generation is again inserted into the system as an input signal.
Once the operating point of the predistortion circuit has been adjusted to the optimum point, it will operate over a wide band and wide dynamic range until the optimum compensation state collapses due to temperature fluctuations, power supply fluctuations, long-term characteristic changes, etc., that is, until the next control starts. Since nonlinear compensation is performed well over the range, extremely stable distortion compensation characteristics are achieved. In the above operation, as a method of inserting a pilot for distortion generation, (1) two or more continuous waves are inserted into the empty band of the information signal as shown in Figure 3; or (2)
2 by using the backup line and also using the signal for the backup line.
Insert more than one continuous wave. In case (2), nonlinear characteristic control is performed only on the repeaters used for the protection line, and nonlinear characteristic control of all repeaters is performed by switching between the working line and the protection line at a specific cycle. Ru.
またパイロツト信号の挿入は定常的または周期
的に行なわれるもので、第１図におけるパイロツ
ト検出器１４はパイロツトの挿入を検知し、それ
により非線形特性制御器の動作を始動させる機能
を有する。以上非線形補償回路として３次相互変
調ひずみ雑音の改善を目的としたプリデイストー
シヨン法を用いた場合についてその機能を説明し
たが、第４図に示す如く、入出力５次特性非線形
回路１６を有する径路を新たに設けてベースバン
ドもしくは中間周波帯において、３次相互変調ひ
ずみのみならず５次相互変調ひずみについても改
善を期待するプリデイストーシヨン回路を構成す
る場合についても本発明は同様に成立する。さら
に第５図に示す如く非線形補償回路１５を被補償
増幅器９に対して後置縦接続する場合や、第６図
に示す如く非線形ひずみ発生回路を被補償増幅器
に対して並列に接続する場合についても本発明は
同様に成立する。また偶数次高調波ひずみ成分の
改善を期待する場合には、第４図、第６図におい
て入出力５次特性回路１６を追加した如く入出力
２次特性や入出力４次特性の非線形回路を追加す
れば本発明は同様に成立する。 Further, the pilot signal is inserted regularly or periodically, and the pilot detector 14 in FIG. 1 has the function of detecting the insertion of the pilot and thereby starting the operation of the nonlinear characteristic controller. The functions of the nonlinear compensation circuit have been explained using the predistortion method for the purpose of improving third-order intermodulation distortion noise.As shown in FIG. The present invention also applies to the case where a predistortion circuit is constructed in which a new path is provided to improve not only third-order intermodulation distortion but also fifth-order intermodulation distortion in the baseband or intermediate frequency band. To establish. Furthermore, regarding the case where the nonlinear compensation circuit 15 is connected in series after the compensated amplifier 9 as shown in FIG. 5, and the case where the nonlinear distortion generation circuit is connected in parallel with the compensated amplifier as shown in FIG. The present invention also applies in the same manner. Furthermore, if it is expected to improve even-order harmonic distortion components, a nonlinear circuit with input/output second-order characteristics or input/output fourth-order characteristics may be used, such as adding the input/output fifth-order characteristic circuit 16 in FIGS. 4 and 6. If this is added, the present invention will be realized in the same way.
以上説明したように本発明は、温度変動、電源
変動、径年変化などによつて被補償器系の特性が
変化しても、入力信号のいかんによらず、非線形
ひずみ雑音の発生が最小となるように自動的に補
償器系の特性を制御する機能を有するため増幅器
や周波数変換器の非線形を高安定に補償できる利
点を有する。また従来補償効果を個々の装置にお
いて良好にするために必要であつた補償器系と被
補償器系の初期動作調整作業を省略できる利点を
有する。 As explained above, the present invention minimizes the generation of nonlinear distortion noise, regardless of the input signal, even if the characteristics of the compensated device system change due to temperature fluctuations, power supply fluctuations, changes over time, etc. Since it has a function to automatically control the characteristics of the compensator system so that the characteristics of the compensator system are maintained, it has the advantage of being able to highly stably compensate for nonlinearity in amplifiers and frequency converters. Further, it has the advantage that the initial operation adjustment work of the compensator system and the compensated system, which was conventionally necessary to improve the compensation effect in each device, can be omitted.
最後に本発明の実施の状態を列挙する。 Finally, the state of implementation of the present invention will be listed.
(1) 摂動を行う際、ひずみ発生用パイロツト信号
を入力信号とする中継器を予備回線に切り換え
ること。を特徴とする特許請求の範囲第１項の
自動追従形非線形補償装置。(1) When perturbing, switch the repeater whose input signal is the pilot signal for distortion generation to the protection line. An automatic tracking nonlinear compensator according to claim 1, characterized in that:
(2) 被補償系の出力信号において検出される相互
変調ひずみ成分のレベルが予め定められる値以
下となつたときは摂動動作を予め定められる時
間だけ休止し、休止中にひずみ成分のレベルが
予め定められるレベル以上となつたときは再び
摂動動作を開始すること。(2) When the level of the intermodulation distortion component detected in the output signal of the compensated system falls below a predetermined value, the perturbation operation is stopped for a predetermined time, and during the pause, the level of the distortion component is reduced to a predetermined value. When the level exceeds the specified level, start the perturbation operation again.
(3) ひずみ発生用パイロツト信号が入力信号とし
て挿入されることにより摂動動作を開始するこ
と。(3) A perturbation operation is started by inserting a strain generation pilot signal as an input signal.
第１図は本発明による装置の実施例のブロツク
図、第２図はパイロツト信号と３次相互変調ひず
み成分のスペクトラム図、第３図はパイロツト信
号を情報信号空帯域に挿入した場合のスペクトラ
ムの一例、第４図は本発明による装置の別の実施
例のブロツク図、第５図と第６図は本発明による
装置の更に別の実施例のブロツク図である。
１……信号入力ポート、２……帯域阻止波
器、３，１０……電力分配器、４……遅延線路、
５……入出力３次特性回路、６……可変移相器、
７……可変減衰器、８……電力合成器、９……被
補償増幅器、１１……信号出力ポート、１２……
非線形ひずみ検出器、１３……非線形特性制御
器、１４……パイロツト検出器、１５……プリデ
イストーシヨン非線形補償回路、１６……入出力
５次特性回路、１７……周波数変換器。
Fig. 1 is a block diagram of an embodiment of the device according to the present invention, Fig. 2 is a spectrum diagram of the pilot signal and third-order intermodulation distortion component, and Fig. 3 is a spectrum diagram when the pilot signal is inserted into the information signal empty band. For example, FIG. 4 is a block diagram of another embodiment of the apparatus according to the invention, and FIGS. 5 and 6 are block diagrams of still further embodiments of the apparatus according to the invention. 1...Signal input port, 2...Band stop waver, 3, 10...Power divider, 4...Delay line,
5... Input/output tertiary characteristic circuit, 6... Variable phase shifter,
7... Variable attenuator, 8... Power combiner, 9... Compensated amplifier, 11... Signal output port, 12...
Nonlinear distortion detector, 13... Nonlinear characteristic controller, 14... Pilot detector, 15... Predistortion nonlinear compensation circuit, 16... Input/output 5th characteristic circuit, 17... Frequency converter.
Claims (1)
示し、その位相と振幅を独立に制御可能な付加回
路が非線形補償のために被補償系に直列に挿入さ
れる系において、 入力信号に予め周波数の異なる２波以上のパイ
ロツト信号を注入する手段と、 被補償系出力信号において前記注入手段により
注入されたパイロツト信号から発生する相互変調
ひずみ成分を検出する検出手段と、 該検出手段により検出されたひずみ成分のレベ
ルを記憶する記憶手段と、 前記高次特性の振幅と位相を可変減衰器と可変
移相器により摂動し、摂動後に検出される相互変
調ひずみ成分のレベルを前記記憶手段に記憶され
たひずみ成分レベルと比較する比較手段と、 該比較手段の比較結果に基づき摂動後のひずみ
成分のレベルが減少するごとく前記可変減衰器ま
たは前記可変移相器の調整点を摂動することによ
り次の摂動方向を決定する手段とを具備すること
を特徴とする自動追従形非線形補償装置。[Claims] 1. An additional circuit whose output characteristics exhibit a second-order or higher-order characteristic with respect to the input, and whose phase and amplitude can be independently controlled is inserted in series in the compensated system for nonlinear compensation. In the system, means for injecting two or more pilot signals of different frequencies into the input signal in advance, and detection means for detecting intermodulation distortion components generated from the pilot signals injected by the injection means in the output signal of the compensated system. , storage means for storing the level of the distortion component detected by the detection means, and perturbing the amplitude and phase of the high-order characteristic by a variable attenuator and a variable phase shifter, and storing the intermodulation distortion component detected after the perturbation. comparison means for comparing the level with the distortion component level stored in the storage means; and adjusting the variable attenuator or the variable phase shifter so that the level of the distortion component after perturbation is reduced based on the comparison result of the comparison means. and means for determining the next perturbation direction by perturbing a point.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16144979A JPS5685909A (en) | 1979-12-14 | 1979-12-14 | Automatic following type nonlinear compensation system |
| DE3002995A DE3002995C2 (en) | 1979-02-13 | 1980-01-29 | Customizable equalization system |
| US06/117,282 US4329655A (en) | 1979-02-13 | 1980-01-31 | Adaptive equalization system for nonlinearities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16144979A JPS5685909A (en) | 1979-12-14 | 1979-12-14 | Automatic following type nonlinear compensation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5685909A JPS5685909A (en) | 1981-07-13 |
| JPS6113649B2 true JPS6113649B2 (en) | 1986-04-15 |
Family
ID=15735311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16144979A Granted JPS5685909A (en) | 1979-02-13 | 1979-12-14 | Automatic following type nonlinear compensation system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5685909A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH053070Y2 (en) * | 1986-05-20 | 1993-01-26 |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01260904A (en) * | 1988-04-11 | 1989-10-18 | Fujitsu Ltd | Distortion compensation device |
| JPH0210902A (en) * | 1988-06-28 | 1990-01-16 | Fujitsu Ltd | Distortion compensation device |
| JPH10145161A (en) * | 1996-11-13 | 1998-05-29 | Nec Corp | Pre-distortion automatic adjustment circuit |
| GB2339354B (en) | 1998-07-02 | 2003-10-08 | Wireless Systems Int Ltd | A predistorter |
| GB2347031B (en) | 1999-02-12 | 2001-03-21 | Wireless Systems Int Ltd | Signal processing means |
| GB9906417D0 (en) * | 1999-03-19 | 1999-05-12 | Simoco Int Ltd | Radio transmitters |
| KR100341851B1 (en) * | 1999-08-16 | 2002-06-26 | 오길록 | Control method of adaptive predistortion linear amplifier |
| JP2004112151A (en) * | 2002-09-17 | 2004-04-08 | Hitachi Kokusai Electric Inc | Method for compensating for distortion and transmitter |
| CN100428627C (en) * | 2002-11-14 | 2008-10-22 | 株式会社日立国际电气 | Distortion compensation circuit, distortion compensation signal generating method, and power amplifier |
| JP4559983B2 (en) * | 2002-12-10 | 2010-10-13 | 株式会社エヌ・ティ・ティ・ドコモ | Linear power amplifier and digital predistorter setting method thereof |
| CN1255938C (en) | 2002-12-10 | 2006-05-10 | 株式会社Ntt都科摩 | Linear power amplifying method and linear power amplifier |
| JP4598414B2 (en) * | 2004-02-27 | 2010-12-15 | 株式会社エヌ・ティ・ティ・ドコモ | Control method and apparatus for power series predistorter |
| JP2008048032A (en) * | 2006-08-11 | 2008-02-28 | Hitachi Kokusai Electric Inc | Distortion compensation device |
| JP6255917B2 (en) * | 2013-11-07 | 2018-01-10 | 富士通株式会社 | Wireless device and wireless access system |
-
1979
- 1979-12-14 JP JP16144979A patent/JPS5685909A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH053070Y2 (en) * | 1986-05-20 | 1993-01-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5685909A (en) | 1981-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6113649B2 (en) | ||
| EP1569331B1 (en) | Method and apparatus for control of predistortion linearizer based on power series | |
| EP0411180B1 (en) | Feed forward distortion correction circuit | |
| JPH0777330B2 (en) | Feedforward amplifier automatic adjustment circuit | |
| JP2002094335A (en) | Nonlinear distortion compensation power amplifier | |
| JPH06196939A (en) | Distortion compensating circuit for high frequency power amplifier | |
| US4412185A (en) | Feedforward amplifiers | |
| US5867064A (en) | Method and apparatus for improving intermodulation in a feed-forward amplifier | |
| US7173484B2 (en) | System and method of carrier reinjection in a feedforward amplifier | |
| US5774018A (en) | Linear amplifier system and method | |
| JPH05191178A (en) | Power amplifier | |
| US20050110567A1 (en) | System and method of pilot tone reuse in a feedforward amplifier | |
| JPS6113648B2 (en) | ||
| US6958647B2 (en) | Dual loop feedforward power amplifier | |
| CA2633596C (en) | Regulatable optical amplifier, and method for regulating an optical amplifier | |
| GB2107540A (en) | Feedforward amplifiers | |
| JP2945447B2 (en) | Feedforward amplifier | |
| JP2006345490A (en) | Distortion compensation arrangement and radio communication apparatus | |
| EP1032973A1 (en) | An amplifier and a method of power amplification | |
| JP2945451B2 (en) | Feedforward amplifier | |
| JP2799911B2 (en) | Feedforward amplifier | |
| JP2948279B2 (en) | Feedforward amplifier | |
| JP2711414B2 (en) | Feedforward amplifier | |
| JP2711413B2 (en) | Feedforward amplifier | |
| WO2002050997A1 (en) | Feedforward amplifier, communication apparatus, feedforward amplifying method, program and medium |