FIELD: information technology.
SUBSTANCE: method involves determining a phase shift based precoding matrix which is phase shifted by a predetermined phase angle, initially transmitting each subcarrier symbol to a receiver in a packet unit by using the phase shift based precoding matrix, reconstructing the phase shift based precoding matrix to reduce a spatial multiplexing rate if a negative reception acknowledgement (NACK) is received from the receiver, and retransmitting the initially transmitted subcarrier symbol by using the reconstructed phase shift based precoding matrix or by changing the phase shift based precoding matrix using offset information fed back from the receiver or random offset information.
EFFECT: efficient error correction.
12 cl, 27 dwg, 2 tbl
