摘要
在Ka频段卫星通信系统中,自适应纠错编码是一种很好的抗衰减措施。本文首先分析了抗衰减措施对自适应纠错编码的要求,提出了用RS码作外码、基于1/2卷积码的可变码率收缩码作内码加交织器构造自适应级联码,并对其原理和性能进行了详细分析。仿真表明该自适应级联码编码增益变化范围可达3～12dB以上,适用于卫星下行链路的自适应纠错编码抗衰减对策。
In Ka-band satellite communications,the Adaptive Forward Error Correction (AFEC) is an ideal fade countermeasure。In this paper,the requirements of AFEC as a fade countermeasure are discussed firstly; Taking the complexity of application into account, concatenated codes scheme is presented whichis structured by RS(Reed-Soloman) code as outer code and variable rate punctured codes based on 1/2 convolutional code as inner code combined with interleaver. And its principle and performance are analyzed in detail. Simulation shows that the code gains of the adaptive concatenated codes can reach 3～12dB. It will be a valuable adaptive fade countermeasure(AFCM)in satellite downlinks.
出处
《电讯技术》
北大核心
2004年第5期45-49,共5页
Telecommunication Engineering
基金
总装国防科技重点实验室基金资助项目(00JS63.4.1.JB3203)
关键词
级联码
纠错编码
卫星链路
自适应
编码增益
交织器
衰减
外码
内码
细分
Satellite communication system
Ka band
Adaptive fade countermeasure(AFCM)
Adaptive concatenated code
Punctured code
RS code
