Method for retransmitting data, signal receiver and signal transmitter

Abstract

The invention discloses a data retransmission method in the communication field, which effectively advances the communication reliability and the communication efficiency, comprising: computing the reliability of the fail code block in coding after the signal receiving end fails in coding; according to the reliability of the fail code block when coding, determining the retransmitted check bit number; computing the check bit of the corresponding number based on the transmitted information bit according to the determined check bit number to be transmitted by the signal transmitting end; retransmitting the computed check bit with corresponding number to the signal receiving end. Accordingly, the invention also discloses a plurality of signal receivers and signal transmitters.

Description

technical field [0001] The invention relates to signal transmission technology in the communication field, in particular to a method for retransmitting data, a signal receiver and a signal transmitter. Background technique [0002] Due to the complexity of the communication environment, the signal may experience path loss, shadow fading, multipath fading and be interfered by various noises during the transmission process, resulting in inconsistency between the signal sent by the signal sending end and the signal received by the signal receiving end , reducing the reliability of communication. In recent years, in order to improve the reliability of communication, it is proposed to use the incremental redundancy HARQ technology of LDPC codes for data retransmission. This technology uses Low Density Parity Check (LDPC) codes as error control codes and hybrid Data retransmission processing is performed in combination with Hybrid Automatic Repeat request (HARQ, Hybrid Automatic ...

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Problems solved by technology

[0003] Although this data retransmission method effectively improves the reliability of communication, in this method, the signal sending end does not select the bits that need to be retransmitted based on the bits that have been decoded by the signal receiving end, so two problems arise : First, the retransmitted bits are probably not the code bits that failed to be decoded, thus reducing the probability of successful decoding based on the retransmitted bits at the signal receiving end; second, because there is no quantification of the number of bits that should be retransmitted If the number of retransmitted bits is too large, it will take too long to retransmit each bit. If the number of retransmitted bits is too small, it may be necessary to increase the number of retransmissions for successful decoding. Therefore, retransmission Whether the number of transmitted bits is too much or too little will prolong the signal transmission time and reduce communication efficiency

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