The diversity of MMSE receiver over frequency-selective MIMO channel

This paper analyzes the MMSE receiver in MIMO frequency-selective channels. This expands our understanding of the MMSE MIMO channel, whose diversity was only recently characterized in the MIMO flat-fading regime. Specifically, in this paper lower and upper bounds on the diversity of the MMSE receiver operating over frequency selective MIMO channel under block transmission with zero-padding (ZP) or cyclic-prefix (CP) are produced. The tightness of the bounds is demonstrated for both ZP/CP for the special case of SIMO channel.