小波包多载波系统中的LMS信道估计  

Improved LMS Channel Estimation Algorithm for Orthogonal Wavelet Ppacket Division Multiplexing System

作　　者：徐宁[1] 谭鸽伟[1] 

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021

出　　处：《通信技术》2013年第1期26-28,31,共4页Communications Technology

摘　　要：为了提高正交小波包波分复用(OWPDM)系统抗多径衰落和多普勒频移的性能,提出了一种新的半盲信道估计算法。首先利用时域滤波原理滤去信道响应中的噪声,之后利用信号在时域补零相当于频域内插的原理来获得更精确的最小均方算法(LMS)估计器迭代初值。仿真结果表明,在插入更少导频数目的情况下,新算法估计性能优于最小二乘(LS)信道估计算法,在插入相同数目导频的情况下,与传统的LMS信道估计算法相比,新算法能使系统获得更好的误码性能。In order to improve the performance of anti-multipath fading and Doppler shift for orthogona] wavelet packet-division multiplexing system, a kind of new semi-blind channel estimation algorithm is proposed. First, the time-domain filtering principle is used to filter out the noise in a channel response, and then the zero-padding in time domain equivalent to interpolation in frequency domain is employed to acquire more accurate LMS estimator iterative initial value. Simulation results show that the new algorithm outperforms LS channe] estimation algorithm when fewer pilot number is inserted, and when the same number of pilot is inserted, compared with traditional LMS algorithm. This new algorithm enables the OWPDM system to obtain a better BER Performance.

关 键 词：正交小波包波分复用 半盲信道估计 最小均方算法 多普勒频移 

分 类 号：TN911.23[电子电信—通信与信息系统]