Research On Power Line Carrier Communication System Signal Interference And Spread Spectrum Technology

With the electronic technology and network technology, the use of power line carrier as a signal for transmission by the people more and more attention has been increasingly widely used. In recent years ,the use of low-voltage power lines and indoor subscriber line high-speed data communications is the study of foreign hot spots.In the power line carrier technology, interference and signal attenuation of signal transmission is an important reason. This paper analyzes the power line input impedance and its changes in the high-frequency signal attenuation, the characteristics transmission interference, noise characteristics, and so on. Focus on the analysis of power line carrier communication harmonic generation and its hazards, and the harmonic control and signal attenuation of a number of programs.Despite the low-voltage power line carrier communication from the above-mentioned the existence of these difficulties, we continue to believe that the use of low-voltage power line as a communication channel is feasible. The main thesis of this research-carrier spread-spectrum communication technology, which is in high-speed communications carrier, can be used for the use of low-voltage power line data communications. At present, the representative of the basic low-voltage power line communication technology development. In this paper, spread-spectrum communication technology on the basis of the theory, and direct sequence spread spectrum communications, for example, to study the theory and mathematical models, as well as its power line carrier communications applications, focus on the chirp technology. On this basis, the development of spread spectrum technology based on the data contained in low-voltage power line communication system. The main use of the system using chirp technology , based on CEBus bus, Core of communications systems selection Chip SSCP300, finished the system design and debugging, and results reflect the chirp spread spectrum technology in the low-voltage power line carrier communications in the practical.