Space-time receivers realized in the frequency domain for dispersive wireless channels

We present a class of low complexity space-time receivers for frequency-selective channels in, multiple input and multiple output (MIMO) systems. In particular we extend to MIMO systems two approaches originally derived in the framework of joint detection techniques for code division multiple access by performing, in the frequency domain, feedback processing (Benvenuto, N. and Sostrato, G., IEEE J. Select. Areas Commun., vol.19, p.245-53, 2001) and block linear equalization (Vollmer, M. et al., IEEE J. Select. Areas Commun., vol.19, p.1461-75, 2001), while interference cancellation is performed in the time domain (Benvenuto et al., Proc. IEEE WPMC. 2004). Moreover, we extend to the frequency domain the fully connected ordered successive interference cancellation DFE (Lozano, A. and Papadias, C., IEEE Trans. Commun., vol.50, p.65-73, 2002). We show that these hybrid time-frequency domain space-time receivers yield almost the same performance with a much lower computational complexity than the original space-time receivers implemented in the time domain.