利用马尔可夫链建模PLC系统中的信道噪声  

PLC Channel Noise Modeling based on Markov Chain

作　　者：张锋[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《电力系统通信》2010年第9期65-69,共5页Telecommunications for Electric Power System

摘　　要：分析了PLC信道的特点,提出了利用马尔可夫模型对低压电力线通信信道建模。同时讨论了适用于马尔可夫模型参数估算的Baum_Welch算法,提出了消除其上、下溢问题的一种改进方法。在应用Baum_Welch算法对提出的马尔可夫模型进行参数估计和仿真后,文章还对电力线通信系统的2种典型应用环境实测了4种典型调制方式下信道的无误串分布,分析了4种典型调制方式下低压电力线通信信道的特性,所得到的结论与其他研究者的结论相一致,验证了文章提出的观点以及方法理论是切实可行的,其符合实际低压电力线通信信道情况。In the paper,the characteristics of LV PLC channels are analyzed in detail,and a Markov model is proposed to build channel model.Then,the Baum Welch algorithm for the Markov model is discussed,and an improved method to handle overflow and underflow is proposed.Based on the parameter estimation and simulation on Markov model using Baum Welch algorithm,the error-free distribution of four typical modulation channels in two typical application environments is measured,and the characteristics of them are analyzed.The conclusion verified that the proposed Markov model and the solution of the Markov parameters are available for PLC channels.

关 键 词：低压电力线 通信信道 脉冲噪声 Baum_Welch算法 马尔可夫模型 

分 类 号：TN915.853[电子电信—通信与信息系统]