A new Inter-Carrier Interference cancellation using CP-ICA scheme in OFDM systems

A well-known problem of OFDM is its sensitivity to frequency offset which leads to Inter-Carrier Interference (ICI) in the OFDM symbol. This ICI causes severe degradation of the BER performance of the OFDM receiver. In this paper, we propose a new ICI cancellation algorithm which estimates frequency offset at the time-domain by using the Cyclic Prefix (CP) based Independent Component Analysis (ICA) method to the received subcarriers. We derive the frequency offset estimation technique by using CP-ICA analyzing the phase rotation of the OFDM symbols. This algorithm is based on a statistical blind estimation method, which mainly utilizes the Eigenvalue Decomposition (EVD), rotating phasor and the 4(th) cumulants. In the case of 0.0< epsilon <1.0, simulation results show that the proposed frequency offset estimator is more accurate than the other estimators under AWGN and Rayleigh flat fading channels.