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Unequal protection erasure coding method for distributed dynamic network topology of space communication

A technology for dynamic network and space communication, applied in the field of protection erasure coding

Active Publication Date: 2017-08-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the face of more complex network models, how to organically combine the degree distribution of fountain codes with the network coding operations of intermediate nodes, and even provide tendentious protection for multi-channel information, is still a problem worth exploring.

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  • Unequal protection erasure coding method for distributed dynamic network topology of space communication
  • Unequal protection erasure coding method for distributed dynamic network topology of space communication
  • Unequal protection erasure coding method for distributed dynamic network topology of space communication

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Embodiment Construction

[0066] The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.

[0067] Such as Figure 1 to Figure 13 As shown, a space communication distributed dynamic network topology unequal protection erasure coding method, the system model of the distributed dynamic network is as follows figure 1 shown. Two independent source nodes S 1 and S 2 , to communicate with the destination node D through a common relay node R. The channel deletion probability between node i and node j is expressed as ε ij , for the convenience of description, let S 1 for node 1, S 2 is node 2, thus i∈{1,2,R}, j∈{R,D}. S 1 , S 2 The code block lengths sent by R and R are the same in the same time unit. The relay node R moves periodically around the target node D, so that R cannot always be visible to the source. Therefore, the transmission cycle is divided into two phases: the phase of transmitting data using the relay link wh...

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Abstract

The invention provides an unequal protection erasure coding method for distributed dynamic network topology of space communication. The session transmission process comprises two stages. At the first stage, information source S1 and S2, original information m1 with the length of k1 and original information m2 with the length of k2 generate C1' and C2' through fountain coding, and C1' and C2' are sent to D. At the second stage, information source S1 and S2 and original information m1 and m2 generate C1 and C2 through fountain coding, and C1 and C2 are sent to R; R carries out the network coding rule P of a relay node on received C1 and C2; and C1 and C2 are synthesized to CR, and CR is sent to D. According to the invention, the transmission efficiency of a system is improved, and a flexible unequal protection scheme is realized.

Description

technical field [0001] The invention relates to a communication method, in particular to an erasure coding method for unequal protection of space communication distributed dynamic network topology. Background technique [0002] Fountain code is also called code-free coding. The so-called "code-free" means that the sending end does not need to predict the quality of the link, and can continuously "spray" coded symbols in the form of broadcasting. Therefore, there is no fixed requirement for the code rate. The receiving end only needs to receive enough arbitrary coded symbols to restore the original information of the sending end with a high probability, and its performance is determined by the output degree distribution function. The characteristic that the fountain code has no fixed requirement on the code rate makes its performance in the erasure channel very superior. In addition, as a type of long erasure code, the fountain code does not require continuous feedback and r...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0056H04L1/0061H04L1/0086H04L1/0088
Inventor 焦健杨轶冯博文顾术实吴绍华张钦宇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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