We develop a framework that exploits network coding (NC) and multiple-input/multiple-output (MIMO) techniques, jointly\r\ntogether, to improve throughput of downlink broadcast channels. Specifically, we consider a base station (BS) equipped with\r\nmultiple transmit antennas that serves multiple mobile stations (MSs) simultaneously by generating multiple signal beams. Given\r\nthe large number of MSs and the small number of transmit antennas, the BS must decide, at any transmission opportunity, which\r\ngroup of MSs it should transmit packets to, in order to maximize the overall throughput.We propose two algorithms for grouping\r\nMSs that take advantage of NC and the orthogonality of user channels to improve the overall throughput. Our results indicate that\r\nthe proposed techniques increase the achievable throughput significantly, especially in highly lossy environments.
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