I1-HARQ and I2-HARQ. I1-HARQ reference on the times of retransmission of redundant information in the last frame success data transmission, to predict the current chi straightener channel conditions, to determine retransmission number may be required of redundant information for the current frame transmission. I2-HARQ uses SNR estimator to estimate the signal-noise ratio to check the current channel conditions, thus to determine the retransmission number of chi flat iron redundant information that may be required for the current frame transmission. Through the redundancy check information that may be required in the first success transmission of data, to reduce the time of polo shirts retransmission for redundant information, to reduce the transmission delay.(3) This thesis establishes a men's nike shoes simulation model based on the principle of HARQ system, Simulation the Performance of Turbo code on the AWGN channel, Obtained the impactment of the parameters of Turbo code to the correctness of decoding. to simulate the average retransmission frequency of redundancy data and throughput women's nike shoes in traditional HARQ and two improved HARQ schemes, by setting different system parameters, the improved schemes have improved the effectiveness of system performance, thus we know the improved schemes have better adaptability for different frame length, different generate polynomial, cutting length and constraint length, provides a theoretical reference for the actual application.
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