The Study And Implementation Of Power Line Carrier Communication

Along with the pace of global networking quickening, information networking and control automation have be some the pressing requirements of every industry for improving efficiency and realizing modernization. So it has very wide application prospect. Power line carrier communication technology adopts power line as communication medium and possesses the merits of making full use of resources on hand, easy construction, low comprehensive cost, being unrestricted by environmental conditions. But power line is characteristic of violent change in amplitude-frequency peculiarity, narrow effective band, complex channel character, which needs higher comprehensive characteristics. At the same time,if we can apply the spread spectrum technique on the power line carrier communication,improve the quality of the power line carrier communication,bring direct and considerable social economic benefit.This scientific research project bases on this starting point, develops the modulation and demodulation part for the power line carrier communication which can accomplish the digital transmission on power line.The spread spectrum (SS) conimunicatian system has stronger ability of resisting jamming, narrow band, and multipath interference than that of the conservation communication system. And because of its lower transmitting power spectrum, it also has the characteristics of .low probability intercept and multiple access secure communication. The SS technology has been developing rapidly and has more and more comprehensive applications from the middle of the 50's to nowadays. it has shown strong vitality on the side of communication, data transmission and secure communication.This paper first analyzes deeply the low-voltage power line channel character,and then introduces principles of DS and 2DPSK technique,methods of implementation and discusses the feasibility and superiority of taking DS and 2DPSK technique for modulation plan of...