US Patent 9780847 Channel feedback design for frequency selective channels

Channel feedback reporting for non-orthogonal wireless communication systems employing frequency selective channels. A plurality of channel feedback matrices corresponding to a plurality of sub-carriers of a sub-band for a non-orthogonal channel may be determined by a UE, and one or more effective channel feedback matrices for the sub-band may be determined based on the plurality of channel feedback matrices. Each of the one or more effective channel feedback matrices may be associated with corresponding sets of transmission strategies, where each of the corresponding sets of transmission strategies include one or more transmission strategies of a plurality of transmission strategies for the non-orthogonal channel. Channel feedback information representing the one or more effective channel feedback matrices may be reported to a base station, which may estimate channel quality for the plurality of transmission strategies based at least in part on the channel feedback information, for downlink transmissions to UEs over the non-orthogonal channel.