Patent ID: 8054809

Claim:
A packet retransmission method for use in a system capable of transmitting a signal via first to n-th antennas wherein n is at least three, the method comprising: transmitting first to n-th signals corresponding to a packet via the first to n-th antennas, respectively; receiving a negative acknowledgement (NACK) signal associated with the packet; generating an i-th retransmission signal by using a real part of one of the first to n-th signals other than an i-th signal transmitted via an i-th antenna and an imaginary part of another one of the first to n-th signals other than the i-th signal, wherein i=1, 2, . . . n; wherein the real part and the imaginary part are from different signals; and transmitting the i-th retransmission signal via the i-th antenna.