Channel estimation for power line communication

摘要

Broadband low-voltage power line communications (PLC) has many advantages including less investment cost, construction speed, convenient access. The orthogonal frequency division multiplexing (OFDM) technology for its strong anti-jamming and anti-frequency selective fading characteristics naturally becomes the best low voltage power line communication solution. This paper proposed an OFDM channel estimation method based on compressed sensing (CS) technique according to the channel characteristics of low-voltage power lines. The compressed sensing algorithm in OFDM system was discussed and the orthogonal matching pursuit (OMP) algorithm was employed to reconstruct the PLC channel information. The simulation results showed that the communication channel estimation method based on CS technique was feasible in power line carrier communication system. In CS channel estimation method, the original pilot for the sub-carrier transmission symbols was saved down for the transmission of user data information, thus the effectiveness of information transmission in OFDM systems can be enhanced.