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Subspace Method Based Preceding for Spatial Multiplexing with Limited Feedback  

Mun Cheol (국립 충주대학교 전기전자정보공학부)
Seo Jeong-Tae (국립 충주대학교 전기전자정보공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.10A, 2005 , pp. 906-911 More about this Journal
Abstract
In this paper, for spatial multiplexing with limited feedback, we propose subspace method based preceding in which the active bases are selected at the receiver from a finite number of basis sets Down at both receiving and transmitting ends, conveyed to the transmitter using limited feedback, and assembled into a preceding matrix at the transmitter. The selected bases are conveyed to the transmitter using feedback information on both the index of the selected basis set, which defines the most appropriate set of coordinates for describing a multiple-input multiple-output (MIMO) channel, and the principal bases maximizing the capacity in the selected basis set. We show that the proposed subspace method based preceding provides a capacity similar to that of the closed-loop MIMO even with limited feedback.
Keywords
MIMO; precoding; subspace method; limited feedback; spatial multiplexing;
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