低压电力线载波通信中信道模型的研究

将低压电力线用作通信信道具有其特有的优势 ,但同时它又具有阻抗低、噪声强、信号衰减大和时变性等缺点 ,为了保证其通信质量和提高通信速率 ,有必要研究合适的信号调制、编码、传输和解调方法 ,在进行这些研究时 ,信道是必不可少的。该文通过各种测量结果的分析和噪声模型及信号传播模型的研究 ,认为尽管建立一个通用的精确模型来模拟所有的低压配电网信道情况相当困难 ,甚至不可能 ,但建立一个能反映通道基本特征的近似模型却是可能的 ,也是有必要的 ,它的建立可为低压电力线载波通信研究提供有效的手段

Modelling of the channel for low voltage power line carrier communication

Using low voltage power line as a communication channel has a number of advantages. However, its hostile channel properties such as very low impedance, strong noise pollution, attenuation and time-variance must be considered. As a result, much attention must be done in the aspects of signal modulation, coding, transmission, and demodulation in order to increase the quality and the speed of the communication . Based on the practical measurements, the noise characteristics and signal propagation model are discussed. The following result is obtained from the discussion. Though it is difficult or even impossible to establish a generalized accurate model to represent all kinds of low voltage power communication channels, it is possible to establish an approximate model, which is able to represent the essential properties of the channel. Such kind of model provides us with a powerful tool for the research of low voltage power line signal communication.