一种基于LMS迭代的环路延时估计算法  

A loop delay estimation algorithm based on LMS iteration

作　　者：谭超强[1] 熊春林[1] 魏急波[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《现代电子技术》2015年第20期8-10,共3页Modern Electronics Technique

摘　　要：数字预失真技术是有效补偿射频功率放大器的非线性方案;然而,前向数据与反馈数据之间的延时估计是数字预失真系统的关键性问题,直接影响着非线性的补偿能力。在此基于滑动窗的相关运算,介绍一种整数倍的环路延时估计算法,同时基于LMS迭代逐个数据输入进行比较,提出了一种自适应小数倍的环路延时估计算法。最后对算法进行仿真验证,结果表明,经过整数倍的环路延时估计后,对于在[-T]s,Ts范围内的残余的小数倍延时,该算法均表现出优异的估计性能。DPD（digital pre-distortion）technology is a nonlinear scheme to effectively compensate the RF power amplifier,but the delay estimation between forward data and feedback data is the key of DPD system,which affects the nonlinear compensation capability directly. In this paper,the loop delay estimation algorithm of an integer multiple is introduced based on correlation operation of sliding window. At the same time,a loop delay estimation algorithm of adaptive fractional multiple is proposed according to the comparison of the data inputted one by one based on LMS iteration. The simulation results indicate that the algorithm has superior estimation performance of residual fractional multiple delay in the range of[-T]s,Tsafter the loop delay estimation of the integer multiple.

关 键 词：数字预失真 环路延时估计 LMS迭代 射频功率放大器 

分 类 号：TN919.85[电子电信—通信与信息系统]