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Subspace Method Based Precoding for MIMO Spatial Multiplexing  

Mun Cheol (충주대학교 정보통신공학과)
Jung Chang-Kyoo (충주대학교 정보통신공학과)
Park DongHee (충주대학교 정보통신공학과)
Kwak Yoonsik (충주대학교 컴퓨터공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.9, no.6, 2005 , pp. 1161-1166 More about this Journal
Abstract
In this paper, for spatial multiplexing with limited feedback, we propose subspace based precoding in which the active bases are selected at the receiver from a finite number of basis sets known 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 a basis set, which indicates the most appropriate set of coordinates for describing a MIMO channel, and the active bases having the significant amounts of energy in the selected basis set. We show that the proposed subspace based precoding provides capacity similar to that of the closed-loop MIMO even with limited feedback.
Keywords
MIMO; pecoding; subspace method; limited feedback; spatial multiplexing;
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