摘要
介绍了Turbo码编码／解码概念,在对Turbo码译码器的结构及译码算法分析的基础上,以256时隙的PPM为例来对Turbo码的译码算法进行了推导,对没有采用纠错编码和采用了1／3码率Turbo码的光PPM系统的误码率(BER)进行仿真后的性能曲线比较,证明采用Turbo码的PPM系统性能远远优于未加纠错编码时的系统性能,Turbo码PPM系统的性能得到明显改善。
In this paper, the concept of coding/decoding of Turbo codes will be introduced. Based on the analysis to the structure of Turbo code encoder and decoding algorithm, the decoding algorithm of Turbo codes will be deduced with PPM of 256 time slots as example. The comparison of emulated characteristic performance curve of error rate of optical Pulse Position Modulation (PPM) of no using debugging coding and using Turbo codes of 1/3 code rate will be conducted, so as to testify the performance of PPM system of using Turbo codes is far better than that of un-debugged coding. The performance of PPM system of Turbo codes gets an improvement clearly.
出处
《重庆邮电大学学报（自然科学版）》
2006年第z1期75-78,共4页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
