A blind recognition method for deleting cirrocumulus code of (n-1)/n code rate

A technology for deleting convolutional codes and convolutional codes, which is applied in the field of identification of deleted convolutional codes, can solve the problems of large computational redundancy and limit the scope of blind recognition of deleted convolutional codes, etc.

Inactive Publication Date: 2008-08-06
黄知涛
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Problems solved by technology

The algorithm has a large amount of operational redundancy, and the optimization algorithm requires that the polynomial elements of the parity check matrix have no conventional formula, which limits the scope of blind recognition of the deleted convolutional code

Method used

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  • A blind recognition method for deleting cirrocumulus code of (n-1)/n code rate
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  • A blind recognition method for deleting cirrocumulus code of (n-1)/n code rate

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Embodiment Construction

[0072] Taking the receiving sequence of a digital communication signal that has adopted a certain section of convolution coding as an example, the implementation process of the present invention is set forth:

[0073] (1) The preset parameter L=10, the homogeneous linear equation system is constructed by the receiving sequence, and the estimated check polynomial matrix is ​​H=[h 1 (D), h 2 (D), h 3 (D)]

[0074] (h 1 (D)=1+D 2 +D 3 +D 5 +D 6 , h 2 (D)=1+D 4 +D 6 , h 3 (D)=D+D 2 +D 3 +D 6 ).

[0075] It can be seen that the code rate of the convolutional code is 2 / 3.

[0076] (2) Assume the source code generator polynomial matrix according to the check polynomial matrix:

[0077] G(D)=[g 1 (D), g 2 (D)]

[0078] where g 1 (D)=g 10 +g 11 D+g 12 D. 2 +g 13 D. 3 +g 14 D. 4 +g 15 D. 5 +g 16 D. 6

[0079] g 2 (D)=g 20 +g 21 D+g 22 D. 2 +g 23 D. 3 +g 24 D. 4 +g 25 D. 5 +g 26 D. 6

[0080] (3) By the transformation model o...

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Abstract

The invention discloses a blind identification method for punctured convolutional codes with a code rate of (n-1)/n. A mathematical model v(D)=m(D)G(D) for blind identification of the punctured convolutional codes is established at first, wherein, v(D) represents code output sequence; m(D) represents information sequence waiting for coding; G(D) represents generator polynomial matrix; on the ground that the code output sequence v(D), the generator polynomial matrix G(D) and a check polynomial matrix H(D) meet relational expressions G(D)H(D)<T>=0 and v(D)H(D)<T>=m(D)G(D)H(D)<T>=0, the check polynomial matrix H(D) is estimated by the v(D) at first and then the generator polynomial matrix G(D) is estimated, and finally the received code output sequence v(D) is combined and the information sequence m(D) is recovered. The blind identification method for the punctured convolutional codes with a code rate of (n-1)/n can identify the punctured convolutional codes more simply and more quickly and simultaneously solve the problem that initial place values of code words of the convolutional codes are fuzzy.

Description

technical field [0001] The invention relates to a blind recognition method of channel coding in a digital communication system, in particular to a recognition method of a (n-1) / n coding rate erasure convolutional code. Background technique [0002] Convolutional codes are widely used in many current digital communication systems (satellite communication, mobile communication, etc.) because of their strong error correction capability and the advantages of relatively simple encoding and decoding. The blind recognition of channel codes is the premise and foundation of information acquisition of communication raw data, and plays an important role in non-cooperative communication signal processing, so the research on blind recognition of convolutional codes is of great significance. In addition, in the process of cooperative communication transmission, due to the influence of factors such as channel and delay, relevant control information may not be able to reach the other party ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/23H04L1/00
Inventor 黄知涛柴先明陆凤波彭耿姜文利
Owner 黄知涛
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