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Random modulation-based combined channel and secure coding and decoding design method

A design method and random modulation technology, applied in the field of Turbo codes, can solve the problem that the code stream of the classic Turbo code encoder does not have the encryption function, and achieve the effect of increasing the computational complexity and reducing the coding complexity.

Inactive Publication Date: 2013-12-25
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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Problems solved by technology

[0007] In order to solve the problem that the code stream of the classical Turbo code encoder does not have the encryption function, the present invention designs a random modulation method based on key control

Method used

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  • Random modulation-based combined channel and secure coding and decoding design method
  • Random modulation-based combined channel and secure coding and decoding design method
  • Random modulation-based combined channel and secure coding and decoding design method

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Embodiment Construction

[0018] The modulator design method of the present invention is mainly divided into modulation of encoded code stream and demodulation of received code stream to realize the functions of encryption and decryption of code stream.

[0019] 1. Modulator design method

[0020] Analysis of the code stream of the turbo coder shows that if the code stream output by the modulator is random, the eavesdropper will not be able to obtain the correct demodulation output even if the output code stream is intercepted, thus realizing the secrecy of the code stream sex. The modulator of the present invention is used for figure 2 The Turbo code coding system, the modulator is composed of a random sequence generator and a decision device, its input is a coding sequence, and its output is a modulated modulation sequence. The specific implementation of the modulator designed by the present invention is as follows, with the modified Turbo code encoder ( figure 2 ) as an example.

[0021] First...

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Abstract

In allusion to the problem that a modulator of a routine Turbo code stream has no encryption function, a modulation and encryption method based on key control is designed according to a random modulation-based combined channel and secure coding and decoding design method. By the method, an interleaver is associated with a modulator. Firstly, length of the interleaver is set as N; S is natural sequence of the length N; a Key is adopted to generate a random permutation d of natural numbers having the length N, wherein d=f(S,Key), and f is a random permutation function; mod-2 operation is carried out on d to generate a binary sequence b having the length N; and finally, random modulation is carried out on a reused coded bit sequence c, and a modulation sequence cm is outputted. During demodulation, a receiving end adopts the same Key and random function f with a coding end to generate the binary sequence b having the length N, and demodulation is carried out to output the correct bit sequence c.

Description

technical field [0001] The present invention relates to Turbo codes, also known as a modulator design method of parallel concatenated convolutional code (Parallel Concatenated Convolutional Cade, PCCC) code stream, mainly relates to a Turbo code modulator with code stream error correction and encryption functions ( Modulator) design method. Background technique [0002] For reliable transmission over noisy channels, noise and interference in the channel need to be overcome. Channel coding (Channel Coding) or forward error correction coding (Forward Error Correction, FEC), according to certain criteria to add the necessary check symbols to the information symbols to be sent, the receiving end uses the check symbols and information The coding criterion between symbols detects and corrects errors and improves the reliability of information symbol transmission. The goal of researching channel coding is to use the least parity symbols to obtain high reliability transmission, th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06H04L1/00
Inventor 陈德元凃国防吴伟仁
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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