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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:3211 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
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