Convolutional code length blind recognition method based on Gaussian column elimination

A convolutional code and blind recognition technology, applied in the field of blind recognition of convolutional code code length, can solve problems such as less calculation

Inactive Publication Date: 2021-09-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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Problems solved by technology

This method has a relatively small amount of calculation, but it is only for the recognition of 1/2 code rate co

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  • Convolutional code length blind recognition method based on Gaussian column elimination
  • Convolutional code length blind recognition method based on Gaussian column elimination
  • Convolutional code length blind recognition method based on Gaussian column elimination

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Embodiment Construction

[0027] In order to make the purpose and technical solution of the present invention more clear, the present invention will be further described in detail below in conjunction with implementation examples.

[0028] The invention proposes a method for blindly identifying parameters of convolutional codes with arbitrary code rates under high error codes, and can accurately identify the code length n of convolutional codes when the starting point of the code word is unknown and contains errors.

[0029] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0030] Such as figure 1 As shown, the steps of the convolutional code code length identification method based on Gaussian column elimination of the present invention are as follows:

[0031] S1. The interception sequence is demodulated in the digital communication system, and the length of the interception sequence is L;

[0032] S2. Construct the data matrix X of the r...

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Abstract

The invention belongs to the technical field of code word recognition in a wireless communication system, and particularly relates to a Gaussian column elimination convolutional code length blind recognition method. According to the method disclosed by the invention, whether a linear correlation column exists in a storage matrix or not is searched through matrix column transformation of elementary transformation carried out in a Gaussian elimination process according to the correlation between code elements of a coding sequence; according to the characteristic that a column where a check bit is located can be fully converted into '0' under the condition of no error code, cosine similarity is introduced, and parameters of a convolutional code are determined by measuring fluctuation of the cosine similarity of a normalized column weight vector of the proportion of '1' in each column after Gaussian column elimination of a codeword matrix of the convolutional code and a normalized column weight vector of a random binary matrix. According to the method, 90% code length recognition probability can be achieved when the bit error rate is 0.01, the application range is wide, and the method has good recognition performance for the code lengths of convolutional codes with different code lengths, different code rates and different constraint degrees.

Description

technical field [0001] The invention belongs to the technical field of blind recognition of channel coding in a wireless communication system, and in particular relates to a blind recognition method of a code length of a convolutional code based on Gaussian elimination. Background technique [0002] At present, during channel transmission of digital signals, the signal will be distorted due to noise interference. In order to improve the reliability of data transmission, it is necessary to perform channel coding on the signal. Channel coding includes scrambling, error correction coding and interleaving. Convolutional codes belong to the most important class of codes in error correction coding. As a block code, convolutional codes have the characteristics of short code length, correlation between code words, simple encoding and decoding methods, and good error correction performance. Therefore, it is widely used in satellite communication, deep space communication, mobile com...

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0038H04L1/0059
Inventor 倪飘任春辉王斌付毓生
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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