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Space coupling based LDPC code HARQ retransmission mechanism

A LDPC code, space coupling technology, applied in transmission systems, digital transmission systems, forward error control and other directions, can solve problems affecting user experience rate, increase delay, etc., to improve system throughput, reduce times, reduce The effect of transmission delay

Active Publication Date: 2017-10-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
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AI Technical Summary

Problems solved by technology

In the traditional mechanism, if the CRC check is not passed when the maximum number of retransmissions is reached, it is determined that the data packet is lost and ARQ retransmission is required, which will cause a significant increase in delay and affect the user experience rate
The purpose of the present invention is to overcome the above-mentioned traditional IR-HARQ mechanism that cannot complete the impact on system reliability and time delay when correct decoding is completed within the maximum number of retransmissions, and propose a LDPC code HARQ retransmission mechanism based on space coupling

Method used

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  • Space coupling based LDPC code HARQ retransmission mechanism
  • Space coupling based LDPC code HARQ retransmission mechanism
  • Space coupling based LDPC code HARQ retransmission mechanism

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Embodiment 1

[0042] This embodiment elaborates in detail that the LDPC code HARQ retransmission mechanism based on spatial coupling proposed by the present invention fails to transmit an information sequence u with a length of 800 bits. 1 The specific implementation process under the circumstances. Set the newly transmitted information sequence u 2 800 bits in length, u 1 and u 2 Each contains 20-bit CRC check information, the initial transmission code rate is 2 / 3, the size of the basic matrix is ​​40×50, the LDPC decoding method is the minimum sum decoding algorithm, and the maximum number of HARQ retransmissions is 4. The specific operation steps are as follows:

[0043] Step A, the receiving end will retransmit the code word sequence c with a length of 4000 but has not passed the CRC check four times 1 The corresponding soft information sequence y 1 =[yu 1 yp 1 ] are stored in the register, where yu 1 Represents the code word sequence information bit u 1Corresponding soft infor...

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Abstract

The invention discloses a space coupling based LDPC code HARQ retransmission mechanism, and belongs to the technical field of error control. A receiving end stores old code sequences failed in transmission in a buffer; a transmitting end constructs a coupling basis matrix and generates a coupling extension verification matrix, codes the old information sequences failed in transmission and to-be-transmitted new information sequences after being subjected to splicing so as to obtain new code word sequences, stores the new code word sequences in the buffer after the punching positions of the old information sequences and the new information sequence are removed from the new code word sequences, and then selects a code sequence with a certain length and transmits the code sequence through a channel; and the receiving end decodes the received code sequence and the old code sequences in the buffer by utilizing the coupling extension verification matrix and an old decoding verification matrix. By utilizing the error correction performance and retransmission chance of the newly transmitted sequences to restore the sequences failed in transmission in an IR-HARQ mechanism, the space coupling based LDPC code HARQ retransmission mechanism can reduce the ARQ retransmission probability and system delay and can improve the throughput of the system while improving the reliability of a communication system.

Description

technical field [0001] The invention relates to an LDPC code HARQ retransmission mechanism, in particular to an LDPC code HARQ retransmission mechanism based on space coupling, and belongs to the technical field of error control. Background technique [0002] In wireless communication, the two most commonly used error control methods are Forward Error Correction (Forward Error Correction, FEC) coding and Automatic Repeat reQuest (Automatic Repeat reQuest, ARQ). FEC can effectively find and correct error information, but the information redundancy is large and the coding efficiency is low; ARQ technology is simple in coding and decoding, and easy to implement, but the coherence of information transmission is poor in the case of poor channel conditions. Therefore, most wireless communication systems use FEC and ARQ in combination, that is, Hybrid Automatic Repeat reQuest (Hybird Automatic Repeat reQuest, HARQ). In the HARQ mechanism, the codeword can automatically correct err...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/00
CPCH04L1/0057H04L1/0061H04L1/0071H04L1/1812
Inventor 费泽松贾岱张竞文黄靖轩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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