The paper reports a fast transmit antenna selection scheme employing block diagonalization for a multiuser MIMO system, in which a base station features more antennas than RF branches. The task of selecting an optimal sub-set of antennas is achieved in an iterative manner that requires a considerably less time than the earlier reported schemes employing a full search. The newly proposed transmission scheme improves the multiuser MIMO system performance in terms of the sum rate capacity. Computer simulations show that the scheme outperforms the maximized minimum singular (MMS) scheme in the low SNR range.
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