Blind Channel Equalization and Carrier Frequency Offset Estimation for MC-CDMA Systems using Guard Interval Redundancy and Excess Codes

It is well known that multipath channel and carrier frequency offset destroy the orthogonality between subcarriers in the downlink of MC-CDMA and degrade the system performance. In this paper, a new low complexity algorithm is proposed to iteratively estimate the carrier frequency offset (CFO) and the channel equalizer using only the guard interval (GI) redundancy, or excess codes (EC) or both (GI) and (EC) without additional pilots. Simulations illustrate and compare the performance efficiency of these schemes in different scenarios.