Space-Time Receivers Realized in the Frequency Domain for Dispersive Wireless Channels

In this paper, 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 the feedback processing as in [4] and the block linear equalizer as in [3], while interference cancellation is performed in the timedomain [5]. Moreover, we extend to the frequency domain the fully connected ordered successive interference cancellation DFE [2]. 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.