OFDM稀疏信道估计中改进的OMP算法  

Improved OMP algorithm in OFDM sparse channel estimation

作　　者：赵龙慧 潘乐炳 李宝清[1,3] 

机构地区：[1]中国科学院上海微系统与信息技术研究所无线传感网与通信重点实验室,上海200050 [2]中国科学院大学,北京100049 [3]中国科学院上海微系统与信息技术研究所微系统技术国防科技重点实验室,上海200050

出　　处：《计算机工程与设计》2015年第7期1701-1705,共5页Computer Engineering and Design

基　　金：微系统技术国防科技重点实验室基金项目(9140C18010214XXXX)

摘　　要：针对传统的最小二乘(LS)算法需要导频数多而估计精度不高、正交匹配追踪(OMP)算法估计效果好但计算复杂度高的缺点,从硬件实现的角度出发,提出一种基于动态门限的OMP信道估计算法,对OFDM的信道响应进行估计。该算法可减少OMP算法寻找匹配向量时向量运算的次数。仿真结果表明,与LS算法相比,该算法使用较少的导频,获得了很好的信道估计性能;与OMP算法相比,该算法显著减少了计算复杂度和运算时间。Based on the fact that the conventional least squares（LS）algorithm needs many pilots but the accuracy is not high and the orthogonal matching pursuit（OMP）algorithm has high precision as well as high computational complexity,from the perspective of hardware implementation,an improved OMP algorithm was applied to the OFDM system channel estimation.This algorithm reduced the number of vector operations in OMP algorithm when finding the match vector.Results of simulations show that the improved algorithm has better performance with fewer pilots compared to least square estimation.Compared with the OMP algorithm,the improved algrithm can acquire almost the same performance with lower complexity and less computation time.

关 键 词：正交频分复用 信道估计 压缩感知 正交匹配追踪 动态门限 

分 类 号：TN911.5[电子电信—通信与信息系统]