信道压缩表示的OFDM快衰落信道估计

doi:10.3969/j.issn.0255-8297.2012.06.004

应用科学学报 ›› 2012, Vol. 30 ›› Issue (6): 581-587.doi: 10.3969/j.issn.0255-8297.2012.06.004

信道压缩表示的OFDM快衰落信道估计

方勇1,2，赵维杰1,2，汪敏1,2

1. 上海大学通信与信息工程学院, 上海200072
2. 上海市特种光纤与光接入网重点实验室, 上海200072

收稿日期:2011-06-13 修回日期:2011-11-16 出版日期:2012-11-27 发布日期:2011-11-16
通信作者: 方勇，教授，博导，研究方向：通信信号处理、盲信号处理和智能信息系统，E-mail: yfang@staff.shu.edu.cn;
作者简介:方勇，教授，博导，研究方向：通信信号处理、盲信号处理和智能信息系统，E-mail: yfang@staff.shu.edu.cn; 汪敏，教授，博导，研究方向：数字通信、宽带接入网技术和无线通信，E-mail: wangmin@staff.shu.edu.cn
基金资助:
国家自然科学基金(No.61271213, No.60972056, No.61132004)资助

Estimation of Fast Fading Channel for OFDM Systems Using Compressed Channel Expression

FANG Yong1,2, ZHAO Wei-jie1,2, WANG Min1,2

1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
2. Key Laboratory of Speciality Fiber Optics and Optical Access Networks, Shanghai 200072, China

Received:2011-06-13 Revised:2011-11-16 Online:2012-11-27 Published:2011-11-16

摘要/Abstract

摘要： 针对正交频分复用系统提出基于信道压缩表示的快衰落信道估计算法. 该方法采用一种紧凑型信道冲激响应(channel impulse response, CIR)矩阵及信道核向量的信道压缩表示方法，减少了CIR矩阵中的未知元素数目. 推导了等效信道模型以及CIR矩阵与信道核向量之间的闭式表达式，利用最小二乘和线性最小均方差估计器估计出信道核向量，并由其重构出CIR矩阵，从而实现了信道压缩表示的OFDM快衰落信道估计. 仿真结果表明，该算法能对快衰落信道进行有效估计，并降低系统传输BER.

关键词: 快衰落, 信道估计, 正交频分复用, 信道压缩表示

Abstract: An algorithm using channel compressed expression for estimation of fast fading channel in orthogonal frequency division multiplexing (OFDM) systems is proposed. Specifically, a compressed channel expression based on compact channel impulse response (CIR) matrix and channel kernel vector is introduced, and an equivalent channel model is derived. Both least square (LS) and linear minimum mean square error (LMMSE) estimators are formulated to estimate the channel kernel vector. The CIR matrix is reconstructed from the channel kernel vector. Simulation results show that the proposed algorithm has better estimation accuracy and lower BER as compared to some existing estimation techniques.

Key words: fast fading, channel estimation, orthogonal frequency division multiplexing (OFDM), compressed channel expression

中图分类号:

TN911.7

方勇1,2，赵维杰1,2，汪敏1,2. 信道压缩表示的OFDM快衰落信道估计[J]. 应用科学学报, 2012, 30(6): 581-587.

FANG Yong1,2, ZHAO Wei-jie1,2, WANG Min1,2. Estimation of Fast Fading Channel for OFDM Systems Using Compressed Channel Expression[J]. Journal of Applied Sciences, 2012, 30(6): 581-587.

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信道压缩表示的OFDM快衰落信道估计

Estimation of Fast Fading Channel for OFDM Systems Using Compressed Channel Expression

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