摘要
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。
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.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2014年第6期962-966,共5页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(61202394
61301094)
西工大研究生创业种子基金(Z2012097)资助
关键词
卫星通信
预失真
记忆性非线性信道
高阶信号调制
16APSK
bit error rate, design, errors, functions, iterative methods, matrix algebra, mean square error, poweramplifiers, power spectrum, satellite communication systems, signal to noise ratio, time delay, highorder modulation, nonlinear channel, predistortion
