Closed-loop multiple-input-multiple-output scheme for wireless communication based on hierarchical feedback
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United States of America Patent
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Apr 28, 2015
Grant Date -
Mar 7, 2013
app pub date -
Sep 14, 2012
filing date -
May 29, 2007
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Abstract
The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s).
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