一种低复杂度的椭圆球面波调制信号预失真方法  

A Low Complexity PSWF Orthogonal Modulation Signal Predistortion Algorithm

作　　者：刘传辉 缪幸吉 陆发平 康家方 李笔锋 LIU Chuanhui;MIAO Xingji;LU Faping;KANG Jiafang;LI Bifeng(Aviation Operation Service Academy,Naval Aeronautical University,Yantai 264001,China;Key Laboratory on Signal&Information Processing of Shandong Province,Yantai 264001,China;Unit 92768,PLA,Shantou 515828,China)

机构地区：[1]海军航空大学航空作战勤务学院,山东烟台264001 [2]山东省信号与信息处理重点实验室,山东烟台264001 [3]中国人民解放军92768部队,广东汕头515828

出　　处：《无线电通信技术》2018年第3期268-272,共5页Radio Communications Technology

基　　金：国家自然科学基金项目(6170012154);山东省“泰山学者”建设工程专项经费基金资助项目(ts20081130)

摘　　要：针对现有椭圆球面波调制信号预失真方法算法复杂度高、工作效率低的问题,引入信号并行处理思想,提出了一种低复杂度的预失真方法,并完成了系统模型构建。该方法采用2个并行预失真模块,分别对调制信号的解析信号表达式中实部和虚部进行预失真处理,能够有效降低算法复杂度。仿真结果表明,与现有预失真方法相比,该方法的时间复杂度更低,能够有效提高算法收敛速度和预失真器工作效率;能够有效改善调制信号的功率谱,补偿带外失真约23 d B;能够有效补偿调制信号带内失真,当误码率为10-5时,与原调制信号相比,性能差距缩小至0.9 d B。As for the problems of high complexity and low efficiency of the existing predistortion algorithm of PSWF orthogonal modulation signal,a low complexity predistortion algorithm is proposed by introducing the idea of signal parallel processing.The algorithm uses two parallel predistortion algorithm modules to respectively pre-distort the real and imaginary parts of the analytic signal expression of the modulated signal,which can effectively reduce the complexity of the algorithm.Simulation results show that,compared with the existing predistortion,the time complexity of this method is lower,which can effectively improve the convergence speed of the algorithm and the working efficiency of the predistorter.It can effectively improve the power spectrum of the modulated signal and compensate about 23 dB of out-of-band distortion compensation,and it can effectively compensate for the modulation signal in-band distortion compensation,when BER performance is 10-5,compared with the original modulation signal,the performance gap narrowed to 0.9 dB.

关 键 词：卫星通信 椭圆球面波 功率放大器 预失真方法 

分 类 号：TN911.7[电子电信—通信与信息系统]