Abstract
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 assumed that a set of single antenna users share the same physical channel to transmit its own information to the base station, which is equipped with an antenna array. Two space-frequency multi-user IB-DFE-based processing are considered: 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 each subcarrier. In the second one, the equalizer matrices are obtained by minimizing the overall MSE of all users at each subcarrier. For both cases, we propose a simple yet accurate analytical approach for obtaining the performance of the discussed receivers. The proposed schemes allow an efficient user separation, with a performance close to the one given by the matched filter bound for severely time-dispersive channels, with only a few iterations.
Highlights
Single-carrier frequency-division multiple access (SCFDMA), a modified form of orthogonal frequency-division multiple access (OFDMA), is a promising solution technique for high data rate uplink communications in future cellular systems.When compared with OFDMA, single-carrier frequency-division multiple access (SC-FDMA) has similar throughput and essentially the same overall complexity
Two multi-user iterative block decision feedback equalization (IB-DFE)-based processing schemes are considered, both with the feedforward and feedback filters designed in space frequency domain: iterative successive interference cancellation (SIC) and parallel interference cancellation (PIC)
Performance results we present a set of performance results, analytical and numerical, for the proposed IB-DFE-based PIC and SIC receiver schemes
Summary
Single-carrier frequency-division multiple access (SCFDMA), a modified form of orthogonal frequency-division multiple access (OFDMA), is a promising solution technique for high data rate uplink communications in future cellular systems. In [26], the authors proposed an IB-DFE structure consisting of a frequency domain feedforward filter and a time domain feedback filter for single-user SC-FDMA systems. We consider a broadband wireless transmission over severely time-dispersive channels, and we design and evaluate multi-user receiver structures for the uplink single-input multiple-output (SIMO) SCFDMA systems that are based on the IB-DFE principle. Two multi-user IB-DFE-based processing schemes are considered, both with the feedforward and feedback filters designed in space frequency domain: iterative successive interference cancellation (SIC) and parallel interference cancellation (PIC). The equalizer matrices are obtained by minimizing the overall MSE of all users at each subcarrier For both cases, we propose a quite accurate analytical approach for obtaining the performance of the proposed receivers. The index (n) is used in time while the index (l) is for frequency. (.)H, (.)T, and (.)* represent the complex conjugate transpose, transpose, and complex conjugate operators, respectively, E[.] represents the expectation operator, IN is the identity matrix of size N × N, CN(.,.) denotes a circular symmetric complex Gaussian vector, tr(A) is the trace of matrix A, and ek is an appropriate column vector with 0 in all positions except the kth position that is 1
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