Abstract
Adaptive MQAM modulation is used to maximize spectral efficiency while keeping bit error rate (BER) under a target level. The closed-form expressions of the average spectral efficiency of adaptive modulation system are derived for beamforming (BF), singular value decomposition (SVD), space-time block coding (STBC) and spatial multiplexing with zero-forcing (ZF) receiver in uncorrelated flat Rayleigh fading channel. Further, a low-complexity adaptive scheme that switches across BF and SVD in closed loop systems, STBC and ZF in open loop systems is suggested to enhance the spectral efficiency on the basis of the closed form expressions.
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