Abstract

In this paper, an adaptive technique employing hierarchical M-ary quadrature amplitude modulation (M-QAM) constellations with space-time block coding (STBC) is investigated as a link layer solution to the simultaneous voice and different classes of data transmission problem over multiple-input multiple-output (MIMO) fading channels. Closed-form expressions as well as numerical and simulation results for achievable spectral efficiency and average bit error rate (BER) of voice and data transmission over correlated Nakagami-m MIMO fading channels are presented. The results show that the performance of adaptive hierarchical modulation can be improved by combining STBC.

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