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Encoding method of distributed LT code

A coding method and distributed technology, applied in the direction of using convolutional code error correction/error detection, data representation error detection/correction, etc., can solve problems such as high operational complexity

Active Publication Date: 2014-12-17
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Application Information

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Problems solved by technology

In the literature, (Soliton-like rateless coding) similar to soliton-like rateless coding is introduced. It uses a combination of fountain code and network coding schemes under the Y network, but this method is more complex in relay operation than in the literature is much larger

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  • Encoding method of distributed LT code
  • Encoding method of distributed LT code
  • Encoding method of distributed LT code

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the description of the drawings and the specific embodiments.

[0021] See figure 1 , The present invention provides a distributed LT code encoding method, including the following steps:

[0022] Set source S 1 , Xinyuan S 2 , Relay r and destination node t, source S 1 Generate and send encoded packet X 1 , X 1 Degree of d 1 , Source S 2 Generate and send encoded packet X 2 , X 2 Degree of d 2 , The encoding package X 1 With encoding package X 2 Use the LT coding scheme to code according to the deconvolution weakly robust solitary wave distribution;

[0023] Define source S 1 , Xinyuan S 2 The code group sent out is NDLT-2 code;

[0024] Source S 1 , S 2 The transmitted coded packet is XORed through the relay r to generate an NMLT-2 code and sent to the destination node t; the NMLT-2 code obeys an approximate weakly robust solitary wave distribution R(·),

[0025] In this embodiment, the relay selection sch...

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Abstract

The invention provides an encoding method of a distributed LT code, comprising the following steps: setting a signal source S1 and a signal source S2, as well as a relay r and a destination node t, wherein the signal source S1 generates and sends out an encoding pack X1, the degree of X1 is d1, the signal source S2 generates and sends out an encoding pack X2, the degree of X2 is d2, and the encoding pack X1 and the encoding pack X2 encode according to deconvolution weak robust solitary wave distribution; defining encoding groups sent by the single source S1 and the signal source S2 as an NDLT-2 code; and generating an NMLT-2 code on the basis of the encoding groups sent by the signal sources S1 and S2 via xor operation of the relay r and sending the NMLT-2 code to the destination node t.

Description

Technical field [0001] The invention relates to a distributed LT code coding method. Background technique [0002] Deleting a channel is an important communication channel model, in which errors are described by deleting. In packaged data transmission, such as scientific data transmission of deep space communications, if the destination node does not receive the corresponding data packet, it means that the packet is deleted. In order to recover the packets lost in file transmission, a forward error correction code, namely fountain code, is proposed. Luby Transform (LT code for short) is the first fountain code to be implemented. LT code uses robust solitary wave distribution for encoding. Raptor code is an improved LT code, which includes two processes of precoding and LT coding. Raptor code uses precoding as the first layer of coding, and LT coding as the second layer of coding, which has better decoding efficiency than LT codes. The encoding steps of the Raptor code are as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/23
Inventor 张钦宇焦健杨志华魏丽婷顾术实
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL