ABSTRACT
A small carrier frequency offset (CFO) compromises the orthogonality between the Orthogonal Frequency-Division Multiplexing subcarriers, leading to performance degradation that increases rapidly with the frequency offset. Assume that the channel remains unaltered within a block, only varying along the frame and that the frequency error is constant during the frame transmission interval. Based on frequency offset compensation methods, the receivers consist of modified Iterative block-decision feedback equalizer schemes, that equalize the received single-carrier signal and compensate the residual CFOs. The channel variations can be a consequence of two main factors, the Doppler effects associated with the relative motion between the transmitter and the receiver and/or the frequency errors between the local oscillators at the transmitter and the receiver, due to phase noise or residual CFO. Oscillator drifts consist of frequency errors due to frequency mismatch between the local oscillators at the transmitter and receiver.
