Error probability analysis of OFDM systems with ICI self-cancellation over AWGN and Rayleigh flat-fading channels

Abstract

Self-cancellation schemes have received a lot of attention due to their simple implementation and high efficiency to suppress intercarrier interference (ICI) in Orthogonal Frequency Division Multiplexing (OFDM) systems. Among those ICI self-cancellation methods, Symmetric Conjugate Symbol Repetition (SCSR) has been proven to have the best bit error ratio (BER) performance for phase noise suppression. In this paper, we investigate the performance of OFDM systems with SCSR ICI self-cancellation in the presence of both phase noise (PHN) and carrier frequency offset (CFO), and derive analytical expressions to calculate error probability evaluated by symbol error ratio (SER) over AWGN and Rayleigh flat fading channels. An approach of second order approximation of PHN/CFO has been performed to estimate the residual ICI, which could provide more accurate results. Simulation results show perfect agreement with those obtained by theoretical analysis, which could be used to estimate MQAM-OFDM system error probability, facilitating the design of the overall system.