Synchronization Algorithm Research Based on OFDM in Low-Voltage Power Line Communication

Abstract

The synchronization problem is analyzed for low voltage power-line communication of orthogonal frequency division multiplexing (OFDM). It is analysed theoretically what affect synchronization problem such as frequency synchronization error and timing synchronization error. A new symbol timing and carrier frequency synchronization algorithm is presented and the algorithm divides the OFDM symbol into several parts. It uses correlation and accumulation in several OFDM symbols to acquire estimation function. When the length of part is smaller than that of ISI free region , the algorithm can distinguish it. Then the estimation of optimal symbol timing and carrier frequency offset can be acquired .The computer simulation results show that the proposed algorithm not only can track time varying channel change but also has smaller MSE than that of ML estimation algorithm.