一种并行两箱预失真方法  

A predistortion algorithm based on parallel two-box model

作　　者：钟佩琳[1] 王红星[1] 刘传辉[1] 康家方[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《华中科技大学学报（自然科学版）》2014年第2期86-90,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60772056);山东省'泰山学者'建设过程专项经费资助项目

摘　　要：针对基于记忆多项式的预失真方法相关矩阵条件数和复杂度随着阶数的升高而急剧增加,数值计算复杂且失稳的问题,提出一种并行两箱预失真方法,采用非迭代查询表和正交记忆多项式两个并行模块,分别补偿功放高阶非线性失真和低阶记忆非线性失真.两个模块相互补充,预失真精度高,只须对低阶正交记忆多项式系数进行迭代求解,复杂度低.通过仿真验证了该方法对非正弦时域正交调制信号的有效性,并与基于传统多项式的预失真方法以及查询表级联多项式预失真方法进行了比较.仿真结果表明:所提预失真方法收敛速度快,复杂度低,均方误差较传统记忆多项式预失真降低19dB,较级联预失真降低4dB,功率谱和误比特率性能接近原调制信号,均优于其余两种方法.In predistortion algorithm based on memory polynomial model ,the condition number of correlation matrix and the computation complexity rise drastically as the order of polynomial increa-ses .To overcome the above weakness ,a predistortion algorithm based on parallel two-box model was presented ,which contained two parallel module ,non-iterative look-up-table and orthogonal memory polynomial .The former is to compensate the high order nonlinearity of power amplifier ,while the lat-er is for low order nonlinearity and memorability .Two boxes supplement to each other ,leading to high precision and low complexity .The effectivity of the new method to non-sinusoidal orthogonal modulation signal in time-domain was verified through simulation ,while the performance was com-pared with predistortion algorithm based on conventional polynomial and algorithm based on look-up-table cascaded by memory polynomial .The simulation results show that the new method reduces the mean square error by 19 dB and 4 dB comparing with the two algorithms mentioned before respective-ly ,and the power spectrum density and bit error rate performance are approximate to the original sig-nal .The proposed algorithm is better than the other two methods .

关 键 词：功率放大器 记忆效应 预失真 并行两箱模型 正交记忆多项式 

分 类 号：TN911.3[电子电信—通信与信息系统]