A greedy cophasing scheme for MIMO beamforming systems using quantized feedback

Authors:
Young Gil Kim;Norman C. Beaulieu
Affiliations:
Dept. of Electrical and Computer Engineering, University of Seoul, Seoul, Korea;Dept. of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

Citing 3
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Abstract

We propose the Hadamard matrix as a codebook for multiple-input multiple-output (MIMO) beamforming systems, and show that a quantized equal gain transmission (QEGT) scheme using the Hadamard codebook has the same symbol error probability performance as a receiver selection diversity combining scheme operating in independent generalized Rayleigh fading channels. Also, we propose a greedy cophasing scheme for MIMO beamforming systems using quantized feedback. The greedy cophasing scheme provides 3.2 dB power gain over an orthogonal space-time block code when the number of transmit antennas is four, the number of receive antennas is one, and the number of feedback bits is three.