Hybrid automatic retransmission method and device

Abstract

The invention discloses a hybrid automatic retransmission method, which is used for improving transmission reliability and comprises that: a transmitting end performs sub-carrier mapping of a pilot frequency according to a first pilot frequency pattern, performs sub-carrier mapping of data and transmits the mapped pilot frequency and data; after receiving an error receiving identifier, the transmitting end performs the sub-carrier mapping of the pilot frequency according to a second pilot frequency pattern, performs the sub-carrier mapping of the data, transmits the mapped pilot frequency and retransmits the mapped data; a receiving end performs channel estimation and decoding on received data stream according to the first pilot frequency pattern; in case of a decoding failure, the receiving end sends an error receiving identifier to the transmitting end; and the receiving end performs the channel estimation and decoding of the data steam retransmitted by the transmitting end according to the second pilot frequency pattern. The invention also discloses a device for implementing the method.

Description

technical field [0001] The invention relates to the fields of computer and communication, in particular to a hybrid automatic retransmission method and device. Background technique [0002] At present, in order to overcome the influence of wireless mobile channel time-varying and multipath fading on the signal, and restore the signal better, the receiving end performs channel estimation based on the pilot signal to obtain a more accurate data signal. [0003] However, when the channel estimation based on the pilot signal is biased, it may not be possible to decode the data signal. To solve this problem, the wireless communication system can adopt error control methods based on Forward Error Correction (FEC) and Automatic Repeat Request (ARQ) to reduce the bit error rate of the system to ensure communication quality. Although the time delay generated by the FEC scheme is small, the existing coding redundancy reduces the throughput of the system; although there is no coding r...

AI Technical Summary

Problems solved by technology

[0004] However, in the current retransmission method, although the code rate of the original signal for each retransmission may change, the density of the pilot signal, that is, the number and position, remain unchanged, so the time-domain fading of the pilot signal for the channel after retransmission and frequency fading estimation methods remain unchanged, resulting in no improvement in the accuracy of channel estimation

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