Research On The Synchronization Of OFDM Based On The Physical Layer Of Wireless MAN

OFDM with high frequency utilization and strong anti-fading ability is widely used in a variety of communication systems,but it is very sensitive to the timing and frequency-offset.When the synchronization error exists, the orthogonality of the sub-carries is destroied, which causes serious carry interference and signal interference, so precise synchronization for OFDM systems is very important.This paper mainly simulates and compares some classic synchronization algorithms.And then take the physical layer OFDM structure of the wireless MAN as the basic model, choose the appropriate algorithm for the timing and frequency offset estimation of the simulation.In the stage of the timing, if the frequency-offset is incerased and the Signal-to-Noise is ruduced, then the timing become inaccurate and the algorithm does not work.This paper gives a new method based on the idea of difference.The new method can confront frequency-offset when it is in the moment of the symbol timing synchronization, presenting a good performance.