北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2004, Vol. 27 ›› Issue (3): 18-22.

• 论文 • 上一篇    下一篇

信道估计有偏差时空时分组码的性能分析

罗 涛, 郝建军, 李剑峰, 乐光新   

  1. 北京邮电大学 电信工程学院, 北京 100876
  • 收稿日期:2003-04-15 出版日期:2004-03-28
  • 作者简介: 罗涛(1971—), 男, 博士, 讲师. E-mail:tluo@bupt.edu.cn
  • 基金资助:
    国家自然科学基金项目(60172052,90104018); 国家“863计划”项目(2001AA123016)

Analysis on the Performance of Orthogonal Space-Time BlockCodes with Non-Iideal Channel State Information

LUO Tao, HAO Jian-jun, LI Jian-feng, YUE Guang-xin   

  1. Telecommunication Engineering School, Beijing University of Posts andTelecommunications, Beijing 100876, China
  • Received:2003-04-15 Online:2004-03-28

摘要: 理论分析了信道估计不准确时正交空时分组码(OSTBC)的符号差错性能。理论研究结果表明,已有的配方简化译码算法同样适用于信道估计不准确时的情形,并可推导出系统的接收信噪比和符号差错性能界。数值仿真结果表明,信道估计不准确会带来性能的损失,且估计值的偏差越大,损失也就越大;但当估计值偏差的方差小于某一数值(如0.2)时,系统性能的损失就相当小。

关键词: 信道编码, 空时分组码, 分集技术

Abstract: A theoretical study of the symbol error rate (SER) for orthogonal space-time block codes (OSTBC) was presented while there existed non-ideal channel state information (CSI). it was proved that the squaring method to simplify the decoding of OSTBC could be used. Both signal-to-noise ratio and SER expressions for OSTBC, using this squaring method, got derived under the above conditions. Numerical simulation shows that the performance with non-ideal CSI is poorer than that with ideal one, and also shows that the more estimation errors there exist, the more performance losses. It is concluded that the SER bound decreases slowly when the variance of estimation errors is less than some small values (say 0.2).

Key words: channel codes, orthogonal space-time block codes, diversity technology

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