Patent ID: 8325845

Claim:
An automatic repeat request (ARQ) transmission method in a wireless communication system wherein data packets are transmitted from a transmitter to a receiver, using a first transmission and a second transmission based on a repeat request, the method comprising: modulating said data packets at the transmitter using a first mapping to obtain first data symbols; modulating said data packets at the transmitter using a second mapping to obtain second data symbols; performing the first transmission by transmitting the first data symbols and the second data symbols over a plurality of diversity branches to the receiver; performing the second transmission by transmitting third data symbols after modulation of said data packets using a third mapping and fourth data symbols after modulation of said data packets using a fourth mapping, over the plurality of diversity branches to the receiver; demodulating the received data packets at the receiver using the first to fourth mappings respectively; and diversity combining the demodulated data packets received over the plurality of diversity branches.