MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATION SYSTEM USING DIFFERENTIAL CODEBOOK INCLUDING UNITARY MATRICES

摘要

PURPOSE: A multi input/output communication system is provided to create an optimal code book suitable for a channel state using a differential code book. CONSTITUTION: A memory unit(521) stores a differential codebook including a plurality of unitary matrices. A searcher(522) searches for an unitary matrix corresponding to the relation between explicit feedback information and previous preference code word among the unitary matrices. The explicit feedback information has a relation with an explicit channel matrix between a receiver(520) and a transmitter(510). A feedback unit(523) transmits feedback about the unitary matrix to the transmitter.