CAJ | 학술논문

针对卫星星载功率放大器工作在饱和区域所造成的卫星传输信号非线性特性，以及传统的前置预失真器由于延时、高阶信号调制等原因，不能完全消除功率放大器的非线性影响与记忆效应。提出了一种可用于多幅度高阶信号调制的后置预失真器算法，该算法通过建立多变量矩阵后置预失真器来消除功率放大器的非线性影响和记忆性影响。从误码率、功率谱和星座图3个方面对所设计的后置预失真器进行性能分析，仿真结果表明后置预失真器可以有效消除高阶调制信号的非线性影响和记忆性影响，在实际应用领域拥有较高的价值。
침대위성성재공솔방대기공작재포화구역소조성적위성전수신호비선성특성，이급전통적전치예실진기유우연시、고계신호조제등원인，불능완전소제공솔방대기적비선성영향여기억효응。제출료일충가용우다폭도고계신호조제적후치예실진기산법，해산법통과건립다변량구진후치예실진기래소제공솔방대기적비선성영향화기억성영향。종오마솔、공솔보화성좌도3개방면대소설계적후치예실진기진행성능분석，방진결과표명후치예실진기가이유효소제고계조제신호적비선성영향화기억성영향，재실제응용영역옹유교고적개치。
Satellite power amplifier working in the saturation region causes nonlinear effect and traditional predistor-tion cannot eliminate the nonlinear effect due to delay, high order modulation and so on.We propose post predistor-tion algorithm that can be used in high order modulation and that can perfectly remove the nonlinear effect of satel-lite power amplifier.Simulation results and their analysis in three respects ( bit error rate, power spectrum and con-stellation) show preliminarily our proposed post predistortion can eliminate the effect and memory of satellite power amplifier.