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Adaptive feedback for MIMO beamforming systems

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2 Author(s)
B. Mondal ; Wireless Networking & Commun. Group, Texas Univ., Austin, TX, USA ; R. W. Heath

Multiple-input multiple-output wireless systems can achieve significant diversity and array gain by using transmit beamforming and receive combining techniques. This however, requires channel information at the transmitter in the form of a beamforming vector. The literature describes methods to quantize the beamforming vector and feedback that information to the transmitter assuming a particular channel distribution, commonly uncorrelated Rayleigh. When the channel is correlated, these quantization strategies result in considerable degradation of signal to noise ratio. In such cases, the spatial and temporal correlations in the beamforming vector are exploited to develop quantization schemes that adapt to the distribution of the channel. Two scenarios are considered - (i) when the feedback rate is fixed and distortion is minimized (ii) when distortion is constrained and rate is minimized. Both the algorithms largely outperform quantization schemes that are based on uncorrelated Rayleigh fading assumption.

Published in:

Signal Processing Advances in Wireless Communications, 2004 IEEE 5th Workshop on

Date of Conference:

11-14 July 2004