Unitary isotropically distributed inputs are not capacity-achieving for large-MIMO fading channels

Abstract

We analyze the capacity of Rayleigh block-fading multiple-input multiple-output (MIMO) channels in the noncoherent setting and prove that unitary space-time modulation (USTM) is not capacity-achieving when the total number of antennas exceeds the coherence time of the fading channel. This situation is relevant for MIMO systems with large antenna arrays… (More)
DOI: 10.1109/ISIT.2012.6283571

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