Power Line Carrier Communications Based On Ofdm Technology Research

This thesis discusses the present situation and the prospect of the power-line carrier communication system. Based on the current studies, the signal transmission characteristic of the low voltage power-line, used as high frequency carrier communication, is analyzed in this thesis, including input impedance, attenuation and noise disturbance. The fundamental principle of the OFDM is expounded. Farther more the thesis argues deeply on the problems in the engineering application, such as high PAPR and strict synchronization, and also gives the current algorithms. This paper studies the principle of simulink simulation system, and combines operation system device driver. So the scheme of the hardware embedded simulation based on simulink is put forward. Based on the scheme, the paper designs the OFDM simulink module, and simulates it's module and demodule principle and QAM to reduce it's PAPR, and realizes communication between two computers. The result provides that proper code can reduce PAPR of OFDM system, and OFDM technique has a capacious prospect used in low voltage distribution power-line network.