Discrete Rate Spectral Efficiency Improvement by Scheme Switching for MIMO Systems

Adaptive modulation scheme has been widely used in multiple-input multiple-output (MIMO) systems to enhance spectral efficiency while maintaining the bit error rate (BER) under a target level. We consider two MIMO schemes, orthogonal space-time block codes (OSTBC) and spatial multiplexing with zero-forcing receiver (SM-ZF), that apply adaptive modulation scheme and derive closed-form expressions of the average spectral efficiency and BER. Based on the closed-form expression of spectral efficiency, a low complexity switching method is utilized to obtain high spectral efficiency gain over an adaptive system using a single scheme.

[1]  Robert W. Heath,et al.  Transmit selection in spatial multiplexing systems , 2002, IEEE Communications Letters.

[2]  A. Robert Calderbank,et al.  Space-Time block codes from orthogonal designs , 1999, IEEE Trans. Inf. Theory.

[3]  S. Signell,et al.  A simulation environment for multi-antenna software defined radio , 2007, 2007 6th International Conference on Information, Communications & Signal Processing.

[4]  Mohamed-Slim Alouini,et al.  Adaptive Modulation over Nakagami Fading Channels , 2000, Wirel. Pers. Commun..

[5]  Robert W. Heath,et al.  Switching between diversity and multiplexing in MIMO systems , 2005, IEEE Transactions on Communications.

[6]  Robert W. Heath,et al.  Adaptive modulation and MIMO coding for broadband wireless data networks , 2002, IEEE Commun. Mag..

[7]  Calvin H. Wilcox,et al.  Analytical and Computational Methods of Advanced Engineering Mathematics , 1998 .

[8]  Matthew R. McKay,et al.  Switching Between OSTBC and Spatial Multiplexing with Linear Receivers in Spatially Correlated MIMO Channels , 2006, 2006 IEEE 63rd Vehicular Technology Conference.

[9]  Jinliang Huang,et al.  Adaptive MIMO Systems in 2 x 2 Uncorrelated Rayleigh Fading Channel , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[10]  A. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1996, Proceedings of Vehicular Technology Conference - VTC.