In performing SVD-MIMO transmission, a set-up procedure is simplified
while assuring a satisfactory decoding capability with a reduced number
of antennas. A transmitter estimates channel information based on
reference signals sent from a receiver, determines a transmit antenna
weighting coefficient matrix based on the channel information, calculates
a weight to be assigned to each of components of a multiplexed signal,
and sends, to the receiver, training signals for respective signal
components, the training signals being weighted by the calculated
weights. On the other hand, the receiver determines a receive antenna
weighting coefficient matrix based on the received training signals.