Patent ID: 7864745
Filing Date: 2011-01-04
Classification: H04L

Abstract:
1. A data transmitting method with hybrid automatic repeat request in multi-carrier system, wherein, the said method comprises the steps of: a. a transmitter of a local terminal transmitting data to a receiver of an opposite communication terminal, and the receiver of the opposite terminal receiving the data, estimating the signal-to-noise ratios of respective sub-carriers for carrying the data, feeding back the signal-to -noise ratios of respective sub-carriers to a transmitter of the local terminal through the transmitter of the opposite terminal and a receiver of the local terminal, weighting the received data, storing them and providing them to the receiver of the opposite terminal for judging; b. the receiver of the opposite terminal judging whether the data are correct, and outputting the data and sending an acknowledgement (ACK) indication to the transmitter of the local terminal through the transmitter of the opposite terminal and the receiver of the local terminal if the data are correct or sending a negative acknowledgement (NACK) indication to the transmitter of the local terminal through the same route if the data are incorrect; c. when receiving the acknowledgement (ACK) indication, the transmitter of the local terminal getting new data as the data to be transmitted and then returning to step a; d. when receiving the negative acknowledgement (NACK) indication, the transmitter of the local terminal comparing the signal-to-noise ratios of respective sub-carriers for carrying the data fed back from the receiver of the opposite terminal with a threshold, picking out the sub-carriers having the signal-to-noise ratios lower than the threshold, mapping again the data carried by the sub-carriers having the signal-to-noise ratios lower than the threshold onto other sub-carriers having the higher signal-to-noise ratios according to a certain rule and retransmits them to the receiver of the opposite terminal; e. the receiver of the opposite terminal receiving the data, estimating the signal-to-noise ratios of respective sub-carriers for carrying the data and feeding back the signal-to-noise ratios of respective sub-carriers to the transmitter of the local terminal through the transmitter of the opposite terminal and the receiver of the local terminal, at the same time, comparing the signal-to-noise ratios of respective sub-carriers transmitted last time with the same threshold as that in the transmitter of the local terminal, picking out the data of retransmitted part according to the same rule as that in the step d, weighting the retransmitted data, combining the weighted data with the data which are processed before, storing them and providing them to the receiver of the opposite terminal for judging, then returning to step b.