MIMO TRANSMITTER AND RECEIVER FOR SUPPORTING DOWNLINK COMMUNICATION OF SINGLE CHANNEL CODEWORDS

摘要

PROBLEM TO BE SOLVED: To provide a MIMO transmitter configured to operate in a plurality of modes.SOLUTION: A MIMO transmitter comprises: Ntransmit antennas for transmitting spatial streams; a precoder; and a space-time or space-frequency matrix construction unit in communication with the precoder and the transmit antennas. The space-time or space-frequency matrix construction unit constructs a matrix that defines a threaded algebraic space-time (TAST) codeword on the basis of the number Nof virtual antennas, and the number Nof transmit antennas. The MIMO transmitter operates: in an open loop mode when no feedback information is available; in a semi-open loop mode when channel rank information is available; and in a closed loop mode when channel state information (CSI) is available.