Multiple antenna systems, also known as multiple-input multiple-output
(MIMO) radio, can improve the capacity and reliability of radio communication. However, the multiple RF chains associated with multiple antennas are costly in terms of size, power, and hardware. Antenna selection is a low-cost, low-complexity alternative to capture many of the advantages of MIMO systems. This article reviews classic results on selection diversity, followed by a discussion of antenna selection algorithms at the transmit and receive side. Extensions of classical results to antenna subset selection are presented. Finally, several open problems in this area are pointed out.
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