Capacity and performance of adaptive MIMO system based on beam-nulling

Authors:
Mabruk Gheryani;Zhiyuan Wu;Yousef R. Shayan
Affiliations:
Concordia University, Department of Electrical Engineering, Montreal, Quebec, Canada;Concordia University, Department of Electrical Engineering, Montreal, Quebec, Canada;Concordia University, Department of Electrical Engineering, Montreal, Quebec, Canada
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

In this paper, we propose a scheme called "beam-nulling". In the beam-nulling scheme, the eigenvector of the weakest subchannel is fed back and then signals are sent over a generated subspace orthogonal to the weakest subchannel. Theoretical analysis and numerical results show that the capacity of beam-nulling is closed to the optimal water-filling at medium SNR. Additionally, signal-to-interference-plus-noise ratio (SINR) of MMSE receiver is derived for beam-nulling. Then the associated average bit-error rate (BER) of beam-nulling is given numerically and verified by simulation. Simulation results are provided to compare beam-nulling with beamforming. To improve performance further, beam-nulling is concatenated with linear dispersion code. Simulation results are also provided to evaluate the concatenated scheme beamforming at the same data rate.