TCM码在光PPM通信系统中的误码性能分析  

Error performance analysis of TCM code in PPM-based optical communication systems

作　　者：刘朋壶[1] 敖发良[1] 杨志程[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《光通信研究》2008年第2期14-17,共4页Study on Optical Communications

基　　金：军事预研项目资助(B200109)

摘　　要：文章把网格编码调制(TCM)引入到光脉冲位置调制(PPM)中,研究其对光PPM系统误码性能的改善。通过理论推导及对8T-PPM、16PPM和16T-PPM、32PPM分别进行MATLAB仿真,得到以下结论:在保持带宽不变的前提下,8T-PPM与16PPM信息速率相同,但前者误码性能优于后者,且最大达到4.8 dB;虽然16T-PPM的信息速率是32PPM的1.2倍,但前者误码性能优于后者,且最大可达到3.4 dB。TCM确实能有效地改善系统的误码性能。Trellis Coded Modulation（TCM）is introduced into PPM to investigate the error performance improvement in optical Pulse Position Modulation （PPM） systems. Theoretical deduction and MATLAB simulation and comparisons of 8T-PPM with 16 PPM and 16T-PPM with 32 PPM respectively, produce the following results. When the bandwidth is kept constant, 8T- PPM and 16 PPM have the same information rate, but the error performance of the former is better than the latter, up to 4.8 dB at the maximum. On the other hand, the information rate of 16T-P.PM is 1.2 times that of 32PPM, but it has better error performance, up to 3.4 dB at the most. These results prove that the introduction of TCM into PPM does effectively improve the error performance of the system.

关 键 词：脉冲位置调制 网格编码调制 MATLAB 误码率 

分 类 号：TN911.3[电子电信—通信与信息系统]