Channel quality index feedback reduction for broadband systems
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United States of America Patent
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Apr 23, 2013
Grant Date -
May 17, 2012
app pub date -
Sep 12, 2011
filing date -
Mar 16, 2007
priority date (Note) -
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Abstract
Systems and methodology for exploiting channel correlation in time and/or frequency to reduce CQI feedback in wireless communications systems. By compressing CQI feedback at the receiver to reduce redundancy in CQI feedback information that results from the channel correlation, the average feedback rate is reduced. In various embodiments, redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that CQI information for a given CQI reporting instance is communicated to the transmitter only if it differs from the CQI information for the previous CQI reporting instance. Otherwise, no feedback is performed. In other embodiments, CQI feedback is compressed by performing a discrete cosine transform (DCT) on the CQI data.
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