ICI cancellation in SFBC-MIMO OFDM with carrier frequency/timing offset over Rayleigh fading channel

Abstract

Space-frequency block coded OFDM signals is advantageous in high-mobility broadband wireless access, where the channel is highly time-as well as frequency-selective because of which the receiver experiences inter-carrier interference. One of the drawbacks of OFDM has been proved to be its high sensitivity to frequency offset which results in Inter carrier Interference. Second problem is to find exact timing of OFDM symbol at the receiver. This is called timing offset estimation. In this paper, an effort has been made to increase the overall performance of MIMO with OFDM system by combating the above mentioned problems of MIMO OFDM. Existing approaches for the frequency-offset estimation using the preamble data, Maximum Likely estimation of frequency and time offsets in OFDM systems using the two sets of identical cyclic prefix data of the received signals have been already proposed. In this paper an interference cancelling algorithm for cancelling time-selectivity induced ICI due to both carrier frequencies in SFBC OFDM systems is proposed to improve the performance.