基于Turbo码的PCM/FM再入遥测系统性能分析*

作者：季艳中，赵泽茂，曹海燕 日期：2009-12-30/span> 浏览：3683 查看PDF文档

基于Turbo码的PCM/FM再入遥测系统性能分析*

季艳中，赵泽茂，曹海燕
（杭州电子科技大学 通信工程学院，浙江 杭州  310018）

摘要：针对Turbo码对PCM/FM再入遥测系统性能的影响，在遥测信道中实现了系统的仿真。首先介绍了Turbo码的编译码原理；再详细地介绍了一种产生莱斯衰落的方法；最后将Turbo码和PCM/FM系统结合，在莱斯衰落信道上进行了仿真。仿真结果表明，在遥测信道中，基于Turbo码的PCM/FM再入遥测系统与未编码的遥测系统相比较，其编码增益达到了8 dB，大大提高了其在传输条件恶劣情况下的抗误码性能。
关键词：Turbo；PCM/FM；莱斯衰落
中图分类号：TP873.02文献标识码：A文章编号：1001-4551(2009)12-0054-04

Performance analysis of PCM/FM reentry telemetry system based on Turbo codes
JI Yanzhong, ZHAO Zemao, CAO Haiyan
（School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China）
Abstract: Aiming at the impact of Turbo code on the PCM/FM reentry telemetry system, the performance of the system was simulated in the telemetry channel. Firstly, the principle of Turbo encoder and decoder was introduced. Secondly, a method of generating rice fading was given in detail. Finally, the Turbo code were combined with PCM/FM system and simulated in Rice fading channel. The results show that in the telemetry channel, the PCM/FM reentry telemetry system based on Turbo codes has 8 dB coding gain compared to the noncoding telemetry system, which greatly improves the performance of antiBER in bad transmission conditions.
Key words: Turbo; PCM/FM; Rice fading
参考文献(References):
［1］BERROU C, GLAVIEUX A, THITIMAJSHIMA P. Near Shannon Limit Errorcorrecting Coding and Decoding: TurboCodes［C］//Proceeding of  IEEE ICC’93. Geneva: ［s.n.］,1993：1064-1070.
［2］PATRICK R, PETER H. Optimal and suboptimal maximum a posteriori algorithms suitable for turbo decoding［J］. European Trans. on Telecommun,1997,8(2):119-125.
［3］ROBERTSON P, HOEHER P, VILLEBRUN E. A Comparison of Optimal and Suboptimal MAP Decoding Algorithms Operating in Log Domain［C］//IEEE International Conference on Communications. Seattle: ［s.n.］,1995:1009-1013.
［4］SUZUKI. A statistical model for urban radio propagation［J］. IEEE Trans. Commun.,1977,25(7):673-680.
［5］SCHUBLER H, THIELECKE J, PREUSS K, et al. A digital frequencyselective fading simulator［J］. FREQUENZ,1989,43(2):47-55.
［6］LEE W C Y. Mobile Communications Engineerings［M］. New York: McGraw Hill,1982.
［7］LEE W C Y. Mobile Communications Design Fundamentals［M］. New York: John Wiley&Sons,1993.
［8］HALL E K, WILSON S G. Design and analysis of turbo code on Rayleigh channels［J］. IEEE Journal on Selected Area in Comm.,1998,16(2):160-174.
［9］林家儒,吴伟陵.LDPC码在RICE信道中的性能分析［J］.北京邮电大学学报,2004,27（2）:48-53.