Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Forward error correction for Bundles of spatial DTN network based on LDPC coding and decoding

A forward error correction, coding and decoding technology, applied in the field of forward error correction of spatial DTN network bundles

Inactive Publication Date: 2017-03-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, among the optimization methods proposed before, the research on the transmission model after the combination of channel coding and protocol is relatively small.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Forward error correction for Bundles of spatial DTN network based on LDPC coding and decoding
  • Forward error correction for Bundles of spatial DTN network based on LDPC coding and decoding
  • Forward error correction for Bundles of spatial DTN network based on LDPC coding and decoding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] specific implementation plan

[0031] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0032] Most Bundle blocks consist of three parts. Among them, the basic block is the most important component, which only exists in the Bundle. The data block (payload block) is the fundamental target of Bundle transmission, and the maximum number is 1. In addition, there are multiple extension blocks to facilitate the extension of the Bundle protocol. as attached figure 1As shown, the format of the bundle basic block, where the slash part indicates that it can be compressed, so that the bundle overhead can be appropriately reduced.

[0033] The present invention puts the degree value of the LDPC code, the code rate, and the coded data packet number into the dictionary array, because the length of the dictionary part is variable. The dictionary is an important part of the basic block and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a forward error correction for Bundles of a spatial DTN network based on LDPC coding and decoding. Through carrying out research and analysis on end-to-end transmission in the conventional aerospace network environment, an LDPC code and a BP protocol in the DTN communication network are combined, the excellent coding and decoding performance of the LDPC code is applied to the DTN network, and according to a retransmission content, a retransmission mechanism is divided as follows: a receiving end carries out feedback and retransmission on all lost data packets including an original packet and extra packets; and the receiving end only carries out feedback and retransmission on the original packet with the failed iterative decoding recovery. Through adoption of two retransmission modes, the round number of the whole transmission is greatly reduced under the same parameter configuration and the round-trip time is reduced. The link resources are very limited and precious for an aerospace communication network, so that more spaces can be saved for transmission of other information.

Description

technical field [0001] The invention relates to the technical field of air-space communication transmission, in particular to an LDPC codec-based space DTN network Bundle forward error correction method. Background technique [0002] DTN (Delay Tolerant Network) was originally proposed to be applied to the interplanetary network to solve the problem of predictable interruption and long delay in long-distance communication. It was later extended to other networks, including terrestrial wireless networks. The space DTN network is one of them. In common satellite communication, the link between the source end and the destination end is intermittently connected. In terms of link characteristics, the air-space DTN network mainly has three characteristics: long delay, frequent link interruption, and high bit error rate. [0003] Long delay mainly refers to long propagation delay and long queuing time. Satellite communications, especially in medium-orbit and geostationary satell...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L1/00H04L1/16
CPCH04L1/0057H04L1/005H04L1/1607
Inventor 杨志华薄海伟苏敏
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com