Asymptotic performance comparison between dominant eigenmode transmission and Tx/ selection-Rx/MRC for MIMO diversity gain over a Rayleigh fading channel

In this paper, asymptotic symbol error rates (ASERs), of dominant eigenmode transmission (DET) for MIMO (multiple inputs and multiple outputs) diversity gain with small diversity order (the product of the number of Tx antennas and the number of Rx antennas) and Tx/selection (SC)-Rx/MRC with an arbitrary diversity order over a Rayleigh fading channel are derived. The SNR gaps among DET, Tx/SC-Rx/MRC and that with a full diversity gain of the same order are also derived. It is found that for a 2x2 MIMO, DET performs better over Tx/SC-Rx/MRC by 1.18dB and for 3x2 MIMO DET performs better by 1dB. It is also found that a 3x2 Tx/SC-Rx/MRC outperforms a 2x3 Tx/SC-Rx/MRC by 1dB. Simulation results match those in [1] and theoretic derivations in this paper.

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