Patent ID: 7817739

Claim:
A method for reducing an amount of precoding feedback information in a multi-carrier Multiple-Input Multiple-Output (MIMO) communication system, characterized by comprising: carrying, at a receiving end of the system, information on a number of streams Ns using multiple sub-carriers being grouped together into a set Ω of K allowed sub-bands (n 1 , . . . , n K ), jointly selecting, while considering transmission quality for each relevant combination of sub-bands and matrices, a limited number of P codebook indices and a limited number of K′ sub-bands to be included in a subset ω (m 1 , . . . , m K′ ) of the set Ω, wherein K′ is set to a value K′<K and P is set to a value P≦K′, and conveying the P codebook indices and information identifying the subset ω to the transmitting end.