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Multi-ary high-efficiency chaotic communication system based on Walsh codes

A chaotic communication and multi-ary system technology, applied in the field of improving transmission rate and bit error performance, can solve the problem of poor bit error performance of CDSK

Inactive Publication Date: 2019-04-09
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Aiming at the problems of poor CDSK bit error performance and further improving the transmission rate, the present invention proposes a multi-ary high-efficiency chaotic communication system based on Walsh codes

Method used

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  • Multi-ary high-efficiency chaotic communication system based on Walsh codes
  • Multi-ary high-efficiency chaotic communication system based on Walsh codes
  • Multi-ary high-efficiency chaotic communication system based on Walsh codes

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Embodiment Construction

[0017] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0018] figure 1 Shown is the modulation block diagram of the invented MAHE-CDSK system, the specific steps: use Hadamard matrix to construct 2 n The order Walsh code sequence is as follows:

[0019]

[0020] in: Each column represents a Walsh code sequence, sequence length β=2 n , and β is the spreading factor, and there are N (N<β) users in the system.

[0021] First use Logistic mapping to generate chaotic sequence y i,k , and then through the special sign function mapping to generate the chaotic sequence x i,k , the specific process is shown in the following formula (2):

[0022]

[0023] (2) where i=(0,1,2,...β), y i,k is a chaotic sequence generated by Logistic mapping, x i,k is y i,k The chaotic sequence generated by special sign function mapping. Then we know that x i ∈{+1,-1}, and has the following p...

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Abstract

The invention requests to protect a multi-ary high-efficiency chaotic communication scheme based on Walsh codes, belonging to the field of communication system. By replacing the delay structure of a CDSK (Correlation Delay Shift Keying) system with a set of orthogonal Walsh code sequences, the purpose of eliminating inter-signal interference is achieved. A modulator modulates multi-ary symbols carrying N pieces of user information through chaotic sequences, and then, encodes the multi-ary symbols through a set of orthogonal Walsh code sequences. A demodulator carries out demodulation by meansof correlation demodulation. First, received signals are decoded together with Walsh code sequences correspondingly allocated by a sender. Then, the multi-ary symbol of each user is demodulated by a decision threshold. Finally, the binary data information flow sent by each user can be determined according to the multi-ary mapping relationship of the modulator. Compared with CDSK and RA-CDSK systems, the bit error performance and transmission rate of the scheme are greatly improved, and less bit energy is consumed. The good performance of MAHE-CDSK makes the scheme have a wide application prospect in the field of wireless communication.

Description

technical field [0001] The present invention aims to design a multi-ary high-efficiency chaotic communication system (MAHE-CDSK) based on Walsh codes, specifically to improve the traditional correlated delay keying (CDSK) technology, which is a method to improve transmission rate and bit error performance new method. Background technique [0002] Chaos theory, as an emerging discipline developed in the past thirty years, is considered to be one of the three major scientific discoveries of the twentieth century, along with quantum mechanics and relativity. Due to the characteristics of good aperiodicity, inherent randomness, noise-like and very sensitive to the initial conditions of the system, chaotic signals are widely used in various high-security communication systems. Chaotic signals can be generated in continuous or discrete time domains by dynamic nonlinear systems represented by differential equations or chaotic maps, respectively. The discrete signal, that is, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04J13/00
CPCH04J13/0018H04J13/0048H04L27/001
Inventor 张刚徐联冰许嘉平陈和祥石佳蓓周熙程张天骐
Owner CHONGQING UNIV OF POSTS & TELECOMM
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