Patent ID: 8073069

Claim:
A channel information feedback method for a multiple input, multiple output (MIMO) space division multiple access (SDMA) system, comprising: estimating channel state information for a transmission channel from a transmitting device to a first receiving device by receiving one or more signals; generating a receive beamforming vector v for the transmission channel and a codeword u which represents a product of the receive beamforming vector v and a channel matrix H for the transmission channel; generating a first estimated channel quality indicator for the transmission channel based on the codeword u and receive beamforming vector v, where the first estimated channel quality indicator is computed for a minimum interference case where there is a minimum number of receiving devices sharing a time-frequency resource block with the first receiving device; generating a second estimated channel quality indicator for the transmission channel based on the codeword u and receive beamforming vector v, where the second estimated channel quality indicator is computed for an additional interference case where there is more than the minimum number of receiving devices sharing a time-frequency resource block with the first receiving device; and transmitting feedback information to the transmitting device that is representative of the codeword u and at least one of the first or second estimated channel quality indicators.