METHOD FOR REDUCING FEEDBACK INFORMATION OVERHEAD IN PRECODED MIMO-OFDM SYSTEMS

摘要

An improved method for reducing an amount of precoding feedback informati on in a multi-carrier MIMO (Multiple Input Multiple Output) communication sy stem using precoding is disclosed. At the receiving end, the method jointly selects, while considering transmission quality for each relevant combinatio n of sub-bands and matrices, a limited number of P codebook indices to be in cluded in a vector .PI. and a limited number of K' sub-bands to be included in a subset .omega. (m 1,~, m K') of a set .OMEGA. of allowed sub-bands. K' is here set to a value K' < K and P is set to a value P < K'. The vect or .PI. and information identifying the subset .omega. is then conveyed to t he transmitting end.