DOWNLINK LIMITED-FEEDBACK INTERFERENCE ALIGNMENT WITH CONSTANT AMPLITUDE CODEBOOKS AND RATE BALANCE SCHEDULING

摘要

Downlink interference alignment schemes are described which provide, among other things, channel state information (CSI) from the UEs using a constant amplitude codebook. By providing only phase information associated the UEs' channel states, instead of both amplitude and phase information, fewer bits can be used to inform the BSs of the UEs effective channels, thereby reducing the bandwidth requirements associated with the transmission of CSI by UEs for downlink interference alignment purposes. According to other embodiments, feedback information can be used to perform user selection scheduling and rate balancing.