摘要
为了研究编码增益与扩频增益的有效结合,设计了一种卷积码与RS码级联编码直扩系统,并搭建了该级联编码直扩系统的仿真模型,仿真分析了级联编码模块对于所设计的直扩系统性能的影响。仿真结果表明,与未采用任何编码的直扩系统相比较,所设计的级联编码的直扩系统性能在信噪比达到-1.4 dB后表现更优。而在RS码与卷积码之间加入交织器后,选取合适的交织器参数可以使直扩系统的性能得到进一步的提升。
For the optimum tradeoff between code and convolution code concatenated coded DSSS syst The DSSS em is constructed, thus to analyze the effect concatenated coding and spread spectrum processing gain, a RS communication system is designed, and simulation model of the of concatenated coding block on the DSSS communication system. simulation results show that, as compared with the uncoded DSSS, the performance of the concatenated coded system is superior when the signal noise ratio approaches -1.4 dB or more. Meanwhile, by the insertion of interleaving block with proper parameters in between RS code and convolution code, the performance of DSSS system could be further improved.
出处
《通信技术》
2011年第12期45-47,共3页
Communications Technology
关键词
串行级联编码
卷积码
RS码
交织
直接序列扩频
serial concentrated coding
convolution code
RS code
interleaving
direct sequence spread spectrum
