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 (4): 102-106.

• • 上一篇    

新的信噪比估值方法及其在Turbo译码中的应用

吴湛击, 孟德香, 吴伟陵   

  1. 北京邮电大学 信息工程学院, 北京 100876
  • 收稿日期:2003-09-11 出版日期:2004-04-28
  • 作者简介:吴湛击(1977—), 男, 博士生. E-mail:wuzhanji@sina.com;吴伟陵(1938—),男, 教授, 博士生导师. E-maill:weilwu@bupt.edu.cn
  • 基金资助:
    国家自然科学基金项目( 60272052)

New SNR Estimator and Its Applications in Turbo Decoding

WU Zhan-ji, MENG De-xiang, WU Wei-ling   

  1. Information Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2003-09-11 Online:2004-04-28

摘要: Tur bo 码的M AP(最大后验概率)译码算法需要估值信噪比,否则会有一定的信噪比损失.本文基于高阶统计量的分析提出了Turbo 码信噪比估值的新算法,它比已有算法更加简单有效,并且能从高斯信道推广到瑞利信道的一般情况,同时通过进行信噪比估值对Turbo 码译码精度的灵敏性仿真测试证明了新算法的有效性.

关键词: Turbo码, 信噪比估值与补偿, 高阶统计量分析

Abstract: Signal to noise ratio (SNR) is required for maximum aposteriori probability(MAP) decoder of Turbo codes, otherwise there is some loss of SNR. A new algorithm of SNR estimator is proposed, which is based on the high order statistic analysis. The new algorithm is much simpler and more effective than the previous algorithms. And the new algorithm can be used for both the additive white Gaussian noise channel and the Rayleigh channel. The effectiveness of the new algorithm is verified by the computer simulations.

Key words: Turbo codes, signal to noise ratio estimation and compensation, high order statistic analysis

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