吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (01): 253-258.doi: 10.13229/j.cnki.jdxbgxb201401041

• 论文 • 上一篇    下一篇

基于伪随机后缀的OFDM信道估计方法

崔金, 张波, 张彦仲   

  1. 北京航空航天大学 电子信息工程学院, 北京 100191
  • 收稿日期:2013-05-23 出版日期:2014-01-01 发布日期:2014-01-01
  • 作者简介:崔金（1986-），男，博士研究生.研究方向：无线通信，信号处理.E-mail：cuijintiger@163.com
  • 基金资助:

    “863”国家高技术研究发展计划项目（2011AA120501）；国家自然科学基金项目（61171070）.

OFDM channel estimation based on pseudo random postfix

CUI Jin, ZHANG Bo, ZHANG Yan-zhong   

  1. School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
  • Received:2013-05-23 Online:2014-01-01 Published:2014-01-01

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摘要：

提出了一种基于伪随机后缀的正交频分复用（Orthogonal frequency division multiplexing，OFDM）系统模型，并针对其在缓变信道下的信道估计需求，提出了一种基于一阶统计的信道估计方法和利用广义循环矩阵对角化性质的均衡方法。在高斯白噪声（Additive-white-Gaussian-noise，AWGN）信道、频率选择性衰落信道和多普勒信道下，对误码率性能进行了仿真分析。仿真结果表明：该方法适合缓变信道，其误码率性能优于传统插入导频的循环前缀（Cyclic prefix，CP）-OFDM；但对于多普勒信道其性能会变差。

关键词: 通信技术, 正交频分复用, 信道估计, 伪随机后缀, 循环矩阵

Abstract:

A new model of orthogonal Frequency Division Multiplexing (OFDM) system based on pseudo-random-postfix was proposed. In view of the requirements of channel estimation under slow time-varying channel, a channel estimation method based on first-order statistics and a low-complexity equalization using the property of circular matrix diagonalization were proposed. The performance of Bit-Error-Rate (BER) was simulated and analyzed under the Additive-White-Gaussian-Noise (AWGN) channel, frequency selective fading channel and Doppler channel. The simulation results show that the proposed method can be applied to the slowly time-varying channels, such as the slow-moving case, and can achieve better BER performance than the traditional Cyclic Prefix (CP)-OFDM. However, the performance may get worse for the Doppler scenarios.

Key words: communications, orthogonal frequency division multiplexing (OFDM), channel estimation, pseudo random postfix, circulant matrix

中图分类号: 

  • TN929.5

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