Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
What is the value of limited feedback for MIMO channels?
IEEE Communications Magazine
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A fast near-optimal transmission scheme selection algorithm for multiple-input multiple-output (MIMO) systems using spatial multiplexing and linear detection is proposed and analyzed. The algorithm selects a transmit antenna subset such that applying available coding and modulation (CM) modes on each spatially multiplexed substream optimises the throughput under constraints on maximum expected bit error rate (BER) assuming straightforward linear detection. Comparing the performance of the system applying proposed and optimal selection algorithms nearly no degradation is observed with the former. The simulation results also show that a low-rate feedback specifying the active antennas and CM mode per each active antenna enables high spectral efficiency and reliability even for straightforward linear detection.