电力线通信信道背景噪声建模研究

Modeling of background noise in power line communication channel

噪声干扰是影响电力线通信可靠性的最主要因素之一。分析了电力线通信信道背景噪声,搭建了背景噪声测量电路,建立了实测背景噪声的AR模型,分别用奇异值分解法和Levinson-Durbin(LD)递推法计算其AR模型参数,并进行仿真比较分析。结果表明:利用奇异值分解法所求参数和利用LD递推法所求参数都是可行的,奇异值分解法所得参数模型较为复杂,但极为精确,适合电力线通信信道背景噪声的离线计算和分析;LD递推法所得参数模型极为简单,但丧失了较大精度,适合电力线通信信道背景噪声的在线快速生成。

Noise interference is one of the most important factors influencing power line communication＇s reliability. By analyzing the background noise of power line communication＇s channel, the background noise＇s measuring circuit is set up and the AR model of the measured background noise is established. Singular value decomposition and Levinson-Durbin （LD） recursive method are used respectively to calculate the AR model＇s parameters and a comparative analysis of the simulation is made. Results show that parameters obtained by singular value decomposition and LD recursion parameters are both feasible. The parameter model obtained by singular value decomposition is relatively complex, but extremely accurate, which is suitable for the off-line calculation and analysis of the power line＇s background noise; the parameter model obtained by ED recursion is very simple, but has a greater toss of accuracy, fitting for online quick generation of the power line＇s background noise.