The aim of this paper is to propose and evaluate multi-user iterative block decision feedback equalization (IB-DFE)\r\nschemes for the uplink of single-carrier frequency-division multiple access (SC-FDMA)-based systems. It is assumed\r\nthat a set of single antenna users share the same physical channel to transmit its own information to the base\r\nstation, which is equipped with an antenna array. Two space-frequency multi-user IB-DFE-based processing are\r\nconsidered: iterative successive interference cancellation and parallel interference cancellation. In the first approach,\r\nthe equalizer vectors are computed by minimizing the mean square error (MSE) of each individual user, at each\r\nsubcarrier. In the second one, the equalizer matrices are obtained by minimizing the overall MSE of all users at each\r\nsubcarrier. For both cases, we propose a simple yet accurate analytical approach for obtaining the performance of\r\nthe discussed receivers. The proposed schemes allow an efficient user separation, with a performance close to the\r\none given by the matched filter bound for severely time-dispersive channels, with only a few iterations.
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