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In this paper, the authors investigate a cross-layer Transmit Antenna Selection (T-AS) approach for Multiple-Input Multiple-Output Spatial Multiplexing (MIMO-SM) systems, that employ Decision-Feedback Detector (DFD), over Ricean flat-fading channels. The selected transmit antennas are those that maximize the link layer throughput of MIMO channels. A closed-form expression for the system throughput with imperfect Channel State Information (CSI) is derived. Extensive simulation results are provided for the system performance assessment, showing that the cross-layer T-AS scheme always assigns the transmission to the antenna combination which sees better channel conditions, resulting in a substantial improvement over the optimal capacity-based T-AS approach.
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