Patent ID: 8775890

Claim:
A retransmission method based on automatic repeat request (ARQ) in a multiple-input multiple-output (MIMO) communication system using orthogonal frequency division multiplexing (OFDM), the system comprising a receiver and a transmitter each having a plurality of antennas, the method comprising: at the receiver: executing a cyclic redundancy check (CRC) for data received from the transmitter, for every one of the antennas of the transmitter; and transmitting to the transmitter feedback information of acknowledgment (ACK) or negative acknowledgement (NACK) based on a result of the cyclic redundancy check; and at the transmitter: identifying a data stream that requires retransmission based on the feedback information; and selecting a retransmission mode based on (i) the feedback information for the data stream which requires the retransmission as indicated by the feedback information corresponding to the negative acknowledgment (NACK) and (ii) a type of application requiring the data stream, wherein: (a) the selecting of the retransmission mode selects, if the application requiring the data stream is video streaming or facsimile, a mode of retransmitting the data which requires the retransmission as indicated by the feedback information corresponding to the negative acknowledgment (NACK) and simultaneously transmitting a new data; and (b) the selecting of the retransmission mode selects, if the application requiring the data stream is e-commerce, web browsing email access or instant messaging, a mode of retransmitting the data which requires the retransmission as indicated by the feedback information corresponding to the negative acknowledgment (NACK) using a space-time block coding (STBC).