Suppression of phase noise based on superimposed pilots in STBC-OFDM system

In order to solve the CPE (common phase error) and ICI (inter-subcarrier interference) of a STBC-OFDM cooperative system which is caused by the phase noise between the transmitter and receiver. This paper analyzes the performance of two transmit antennas and two receive antennas STBC-OFDM system in frequency-selective Rayleigh channel and proposes a novel suppression method of phase noise, which can get the associations between received signal and pilots using the superimposed pilots, and then apply the iterative operation to improve the accuracy of CPE estimation and signal decision, meanwhile, it can also suppress the ICI caused by the phase noise. The simulation results show that this algorithm can improve the performance of high speed STBC-OFDM cooperation system effectively.