北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2001, Vol. 24 ›› Issue (1): 6-11.

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Turbo码译码算法在频率选择性信道中的修正

林家儒1, 吴伟陵1, 冯志勇2   

  1. 1.北京邮电大学信息工程学院, 北京 100876;
    2.北京邮电大学继续教育学院, 北京 100876
  • 收稿日期:2000-08-23 出版日期:2001-01-10
  • 作者简介:林家儒(1958—),男,山东烟台市人,副教授.
  • 基金资助:
    国家自然科学基金资助项目(69896243)

Modification of Decoding Algorithm of Turbo Code on Frequency-Selective Channels

LIN Jia-ru1, WU Wei-ling1, FENG Zhi-yong2   

  1. 1.Information Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China;
    2.Continuing Education School, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2000-08-23 Online:2001-01-10

摘要: 分析了宽带DS/CDMA系统在多径瑞利信道中的性能,针对多径频率选择性信道对Turbo码译码提出了修正算法——由Rake接收输出经最大比例合并等处理后的信号,除以信道幅度参数αmi的平方之和,以高斯分布计算Turbo码译码的γ函数,并进行Turbo码译码.系统仿真显示,该修正算法极大地提高了系统的误码性能.

关键词: 多径衰落, 瑞利衰落, Turbo码, DS/CDMA

Abstract: The performance of DS/CDMA systems on multipath fading Rayleigh channels is analyzed. And proposes a modified decoding algorithm of Turbo code on multipath frequency-selective fading channels,i.e.the signal with maximum ratio combiner divides by the all square of amplitudes of the channel,calculate the probability function γ for Turbo code,and then decode the signal as Turbo decoding.Computer simulations indicate that the modified algorithm improves greatly the performance of DS/CDMA systems on multipath frequency-selective fading channels and is a promising algorithm.

Key words: multipath fading, Rayleigh fading, Turbo code, DS/CDMA

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