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The aim of this paper is to propose and evaluate multi-user iterative block decision feedback equalization (IB-DFE)schemes for the uplink of single-carrier frequency-division multiple access (SC-FDMA)-based systems. It is assumedthat a set of single antenna users share the same physical channel to transmit its own information to the basestation, which is equipped with an antenna array. Two space-frequency multi-user IB-DFE-based processing areconsidered: iterative successive interference cancellation and parallel interference cancellation. In the first approach,the equalizer vectors are computed by minimizing the mean square error (MSE) of each individual user, at eachsubcarrier. In the second one, the equalizer matrices are obtained by minimizing the overall MSE of all users at eachsubcarrier. For both cases, we propose a simple yet accurate analytical approach for obtaining the performance ofthe discussed receivers. The proposed schemes allow an efficient user separation, with a performance close to theone given by the matched filter bound for severely time-dispersive channels, with only a few iterations

Performance evaluation of IB-DFE-based strategies for SC-FDMA systems