Patent ID: 7872963

Claim:
A Multiple Input Multiple Output (MIMO)—Orthogonal Frequency Division Multiplexing (OFDM) system comprising a transmitter with L transmit antennas, a receiver with M receive antennas, and an uplink feedback device for providing Information of the receiver to the transmitter, wherein the transmitter comprises: a serial/parallel converter for converting continuously inputted symbols of a number of subcarriers to K parallel signals; a signal reproducer for reproducing the K parallel signals by the L transmit antennas; an eigenmode generator for generating eigenbeams of the reproduced K parallel signals outputted from the signal reproducer at each subcarrier, based on N f eigenbeam forming vectors which are fed back long-term and information of a best eigenbeam forming vector at each subcarrier which is fed back short-term, through the uplink feedback device; and a plurality of inverse Fourier converters for receiving K signals outputted from the eigenmode generator and generating an OFDM symbol.