MIMO-OFDM system and pre-coding and feedback method therein
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United States of America Patent
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Feb 3, 2009
Grant Date -
May 24, 2007
app pub date -
Jan 5, 2006
filing date -
Oct 18, 2005
priority date (Note) -
Expired
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Abstract
The present invention provides an antenna-array-based multiple-input multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) system and a pre-coding and feedback method used in the same. The present invention uses QR decompositions of the MIMO channel matrixes to parameterize the channel state information (CSI) of every OFDM frequency band. In addition, the present invention feeds back the information related to θ and φ in the Givens rotation matrixes of the partial frequency bands and then uses an interpolation method to generate θ and φ in the Givens rotation matrixes of all the frequency bands, which further is able to represent the CSI of all the frequency bands. In this way, the present invention has advantages of low complexity and low feedback rate requirement.
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