Channel quality index feedback reduction for broadband systems

摘要

A system 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. Redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that a codebook index for a given reporting instance is communicated to the transmitter only if it differs from the codebook index for the previous reporting instance. Otherwise, no feedback is performed.

主权项

1. An apparatus, comprising:
one or more processing elements configured to:
determine channel state information for wireless communications;determine a plurality of codebook indices corresponding to the determined channel state information;in response to determining that one or more of the codebook indices did not change relative to a previous transmission of channel state information, generate a compressed set of channel state information that omits the one or more of the codebook indices that did not change relative to the previous transmission of channel state information; andtransmit the compressed set of channel state information.