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The sum capacity of a Gaussian broadcast MIMO channel can be achieved with Dirty Paper Coding (DPC). However, algorithms that approach the DPC sum capacity do not appear viable in the forseeable future, which motivates lower complexity interference suppression techniques. Block Diagonalization (BD) is a linear pre-coding technique for downlink multiuser MIMO systems. With perfect channel knowledge at the transmitter, BD can eliminate other users' interference at each receiver. In this paper, the authors study the sum capacity of BD with and without receives antenna selection. They analytically compare BD without receive antenna selection to DPC for a set of given channels.
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