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A low-delay channel coding method combining lt codes and multiple connections

A channel coding and multi-connection technology, applied in the field of low-delay channel coding, can solve the problems of wireless resource waste and huge transmission delay, and achieve the effect of reducing the number of wireless resources and reducing the bit error rate

Active Publication Date: 2022-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the huge transmission delay caused by several retransmissions during HARQ transmission and the large waste of wireless resources caused by multi-connection transmission, and proposes a low-delay channel combining LT codes and multi-connections encoding method

Method used

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  • A low-delay channel coding method combining lt codes and multiple connections
  • A low-delay channel coding method combining lt codes and multiple connections
  • A low-delay channel coding method combining lt codes and multiple connections

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Embodiment 1

[0043]A low-delay channel coding method combining LT codes and multiple connections described in the present invention optimizes the degree distribution function of the LT code, that is, determines the degree distribution function of the joint degree distribution of the double-scale coefficients, and determines the optimal Optimum proportionality coefficients, using the optimized degree distribution function to generate coded symbols, which are transmitted through two links, and the coded symbols received in the two links are combined at the receiving end to perform confident hard-decision decoding. This method achieves better performance than HARQ and traditional multi-connection in terms of decoding delay and communication system stability indicators. The LT code after optimizing the degree distribution function has achieved a significant reduction in bit error rate during transmission. Overhead can be lower than 10 at 0.5 -5 .

[0044] During specific implementation, suppo...

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Abstract

The invention relates to a low-delay channel coding method combining LT codes and multiple connections, and belongs to the technical field of channel coding. The method optimizes the degree distribution function of the LT code, that is, determines the degree distribution function of the joint degree distribution of the dual proportional coefficients, and determines the optimal proportional coefficient according to the channel conditions, and uses the optimized degree distribution function to generate coded symbols, through Two links are used for transmission, and the encoded symbols received in the two links are combined at the receiving end to perform confident hard-decision decoding. This method achieves better performance than HARQ and traditional multi-connection in terms of decoding delay and communication system stability indicators. The LT code after optimizing the degree distribution function has achieved a significant reduction in bit error rate during transmission. Overhead can be lower than 10 at 0.5 ‑5 .

Description

technical field [0001] The invention relates to a low-delay channel coding method combining LT codes and multiple connections, and belongs to the technical field of channel coding. Background technique [0002] Fountain codes (Fountain Codes) is an effective channel coding method, including LT codes, Raptor codes and online fountain codes and other code types. The sender can randomly select d from k source symbols for XOR operation to generate an infinite number of encoded symbols, and the receiver can recover the source symbols from any n encoded symbols, where n is slightly greater than k. Compared with the traditional channel coding method with a fixed code rate, the code rate of the fountain code can be adaptively changed according to the channel conditions without pre-obtaining channel state information, so it is widely used in multimedia communication, satellite communication, data distribution and other scenarios. [0003] With the advancement of technology and the d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0009H04L1/0056
Inventor 韩航程刘昕澔卢继华孙磊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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