Low-complexity CFO compensation technique for interleaved OFDMA system uplink

Carrier frequency offset (CFO) is a challenging problem in the uplink of orthogonal frequency division multiple access (OFDMA). In this paper, we present a new CFO compensation technique for interleaved OFMA uplink. The received signal for each user is corrected by the CFO composed of CFO values from two adjacent users and then the residual interference is cancelled by the parallel interference canceller (PIC) algorithm. In the following we analyze the performance of the proposed method and derive a signal-to-interference (SIR) expression. Finally, simulation results show acceptable performance of the proposed method in comparison with some conventional techniques with lower complexity.