Timing And Frequency Synchronization Algorithm For OFDM System

Orthogonal Frequency Division Multiplex (OFDM) is a kind of efficientmodulation mode. Due to its good ability in coping with multi-path fading and optimumspectrum efficiency, OFDM is widely used in wideband wireless communication.OFDM system is sensitive to symbol timing and carrier frequency offset very muchso that it is probably to produce inter-carrier-interference. Therefore precise timing andfrequency offset estimation and compensation is very important in OFDMcommunication system. Synchronization becomes one of major research topics in thisdomain.The synchronization is discussed particularly and a novel timing and frequencysynchronization algorithm requiring only one training symbol is proposed in this paperfor orthogonal frequency division multiplexing (OFDM) systems. Based on the analysisof conventional methods, the proposed algorithm redesigns a modified training symbolwhich is weighted by the pseudo-noise (PN) sequence in a new manner. This algorithmcan improve the synchronization performance greatly. The simulation results show thatthe proposed algorithm not only possesses better timing synchronization performancethan the conventional method, but also ensures higher accuracy of frequencysynchronization estimation even in the multi-path fading channel.