High-throughput satellite formation data transmission method based on network coding

A data transmission method and a high-throughput technology, which is applied in the field of high-throughput satellite formation data transmission, can solve problems such as the impact of data transmission, achieve the effects of simple transmission steps, improve network throughput, and avoid repeated coding

Active Publication Date: 2017-02-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the scale of the system increases, the scale of the feedback will also increase, which will also affect the transmission of data in the system

Method used

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  • High-throughput satellite formation data transmission method based on network coding
  • High-throughput satellite formation data transmission method based on network coding
  • High-throughput satellite formation data transmission method based on network coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] There is 1 sending node in the system, K=2 receiving nodes, M=10 original data packets to be broadcasted α 1 , α 2 ,...,α M , the size of the sliding window is L=3.

[0055] Specific steps are as follows:

[0056] (1) Let the sending node select 3 original data packets α in the sliding window from the M original data packets i+1 , α i+2 , α i+3 Carry out lower triangular random linear network coding, at this time i=0, then the coding package is:

[0057] c 1 = β 11 alpha 1

[0058] c 2 = β 21 alpha 1 +β 22 alpha 2

[0059] c 3 = β 31 alpha 1 +β 32 alpha 2 +β 33 alpha 3

[0060] beta ij is a random number selected from the finite field F.

[0061] (2) The sending node sends c 1 , c 2 , c 3 These 3 encoded packets are broadcast to K receiving nodes. After the receiving node decodes, a network matrix is ​​obtained Suppose at this time Calculate the number of original data packets solved by the receiving node through the network matrix It ...

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Abstract

The invention discloses a high-throughput satellite formation data transmission method based on network coding. The high-throughput satellite formation data transmission method comprises a transmission satellite and K receiving satellites, wherein K is larger than 1; each receiving satellite feeds back a decoded data packet state to the transmission satellite according to a competitive feedback mechanism after receiving a coded data packet of the transmission satellite; and the transmission satellite adjusts sliding steps of a sliding window according to the data packet state, selecting a next group of coded data packets and transmits the next group of coded data packets to the receiving satellites. Through transmission of the data packets in the manner, retransmission times can be reduced effectively; feedback times are reduced; and network throughput is increased.

Description

【Technical field】 [0001] The invention belongs to the technical field of satellite data transmission, is suitable for data transmission between satellites in a satellite formation, and specifically relates to a high-throughput satellite formation data transmission method based on network coding. 【Background technique】 [0002] In the satellite formation network, due to the limitation of spectrum resources and the channel fading between satellites, how to improve the spectrum utilization rate, overcome the wireless channel fading, and improve the data transmission capacity of the satellite formation network has become an urgent problem to be solved in the satellite formation network. In traditional satellite formation data transmission, when the receiving satellite does not receive some data packets, the sending satellite generally chooses retransmission without network coding or retransmission with network coding. In the retransmission method that does not use network coding...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04L1/16
CPCH04B7/18521H04L1/1607
Inventor 袁建平张若南李彬毕思颖罗建军王姣
Owner NORTHWESTERN POLYTECHNICAL UNIV
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