电讯技术2018，Vol.58Issue(1)：84-90,7.DOI:10.3969/j.issn.1001-893x.2018.01.015
一种级联两箱通用数字预失真器及其辨识算法
A Cascaded Versatile Digital Predistorter and Its Identification Algorithm
摘要
Abstract
A digital predistorter of cascaded simplicial canonical piecewise linear function (SCPWL) and memory polynomial is proposed,and the complex field two-step least square(TSLS) parameter identification algorithm is presented as well.Different from the case that one type of predistorter adapts to specially appointed amplifier,the proposed predistortion algorithm is able to adjust its structure during the parameter identification period automatically to accommodate multiple amplifier models by using the piecewise features of SCPWL function and the nonlinear memory characteristics of memory polynomial.The proposed predistorter algorithm has been used to compensate for traditional polynomial,two-box model and state-ofart envelope tracking amplifiers.Amplitude-frequency and spectrum curves of computer simulations show that the proposed predistorter can adaptively compensate for all these amplifiers' nonlinear characteristics.Algorithm comparison also shows that,in case of envelope tracking amplifiers,the adjacent channel leakage ratio(ACLR) performance of TSLS algorithm can be improved over 35 dB approximately,superior to that of LMS class algorithms about 30 dB.关键词
数字预失真/级联两箱模型/SCPWL函数/记忆多项式/包络跟踪Key words
digital predistortion/cascaded two box model/scpwl function/memory polynomial/envelope tracking分类
信息技术与安全科学引用本文复制引用
袁江南,唐骏,伊锦旺..一种级联两箱通用数字预失真器及其辨识算法[J].电讯技术,2018,58(1):84-90,7.基金项目
国家自然科学基金资助项目(61701422) （61701422）
福建省自然科学基金资助项目(2015J01670) （2015J01670）
厦门市科技计划项目(3502Z20153017) （3502Z20153017）
