光通信研究, 2016 (4): 60, 网络出版: 2016-08-29  

PPM与LDPC光通信系统中脉冲展宽效应补偿办法

The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System
作者单位
重庆邮电大学 光纤通信技术重点实验室, 重庆400065
摘要
在空间光通信系统中,每个入射光脉冲都会发生脉冲展宽效应,导致时隙似然比计算时出现信息丢失,系统性能下降。文章基于PPM(脉冲相位调制)与LDPC(低密度奇偶校验码)迭代解调系统,研究了用时隙似然比加权的办法来补偿脉冲展宽带来的影响。针对服从指数分布与高斯分布两种情况的脉冲展宽,分别采用指数似然比补偿和高斯似然比补偿两种方法进行似然比计算。仿真结果表明,脉冲展宽服从标准差为0.46的高斯分布时,采用似然比补偿的方法可以使误码率性能提高1.3 dB。在一定抖动范围内,高斯补偿和指数补偿具有很好的互换性。
Abstract
In the space optical communication system, the pulse broadening effect during every incident light pulse may cause the information lost when calculating the likelihood ratio, which deteriorates the system performance. In this paper, we study the slot likelihood ratio weighted method to compensate of the effects of pulse broadening based on PPM and LDPC iterative demodulation system .When the pulse broadening obey exponential distribution and Gauss distribution, the likelihood ratio are calculated using both of the Gaussian compensation and exponential compensation. Simulation result shows that when the pulse broadening obey the 0.46 standard deviation of Gauss distribution, the likelihood ratio compensation method can improve the performance by 1.3 dB. Within a certain range jitter, Gaussian compensation and exponential compensation has a very good interchangeability.

向劲松, 肖刚. PPM与LDPC光通信系统中脉冲展宽效应补偿办法[J]. 光通信研究, 2016, 42(4): 60. XIANG Jin-song, XIAO Gang. The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System[J]. Study On Optical Communications, 2016, 42(4): 60.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!