基于电力线信道的自适应均衡设计

An adaptive equalizer design based on power line channel

电力线除了传送电能外,还可以用作载波通信。但电力线信道中存在严重的码间干扰,信号衰减大,常用LMS算法对其进行均衡处理,这种算法简单易实现。但受步长因子限制,不能很好解决收敛速度与精度之间的矛盾。为适应电力线传送数据的要求,针对电力线信道传输特点,在现有均衡算法基础上,提出了一种基于抛物线函数的变步长算法,计算复杂度小,抗噪性强。仿真结果表明,该算法具有更好的收敛速度和精度,能有效提高电力线通信系统性能。

In addition to transmit electricity,power line can also be used to carry communication. However,the power line channel has serious intersymbol interference and signal attenuation. The LMS algorithm is commonly used to balance processing because it is easy to implement. Then restricted by step factor,it is not good enough to solve the contradiction between convergence speed and accuracy. Aimed at the transmission characteristics of power line channel,on the basis of existing algorithm,a new variablestep algorithm based on parabola function is proposed to meet the requirement of transmitting data by power line. The algorithm has small computational complexity and strong resistance to noise. The simulation result shows that,in the condition of power line channel,it has smaller computational complexity,faster convergence speed and higher convergence precision. It can improve the performance of power line communication system effectively.