Automatic retransmission request control system and retransmission method in MIMO-OFDM system

摘要

An automatic retransmission request control system in an OFDM-MIMO communication system includes a retransmission mode selection part which selects a retransmission mode from among (a) a mode in which to transmit the data, which are to be retransmitted, via the same antenna as in the previous transmission, while transmitting, at the same time, new data by use of an antenna via which no data retransmission is requested; (b) a mode in which to transmit the data, which are to be retransmitted, via an antenna via which no retransmission is requested, while transmitting new data via another antenna at the same time; (c) a mode in which to use STBC to retransmit the data via an antenna via which no retransmission is requested; and (d) a mode in which to use STBC to retransmit the data via all the available antennas.

主权项

1. 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).