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Improved orthogonal multi-user differential chaotic communication system

A chaotic communication and multi-user technology, which is applied in multiplexing communication, code division multiplexing system, secure communication through chaotic signals, etc., can solve the problem of low DCSK transmission rate, achieve simple structure, solve radio frequency delay Time, the effect of increasing the transmission rate

Inactive Publication Date: 2020-11-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Aiming at the problems of low DCSK transmission rate and further improvement of bit error performance, the present invention proposes an improved orthogonal multi-user differential chaotic communication system

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  • Improved orthogonal multi-user differential chaotic communication system
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  • Improved orthogonal multi-user differential chaotic communication system

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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 invention OMU-DCSK system modulation block diagram, the specific steps:

[0019] Using Hadamard matrix to construct 2 n The order Walsh code sequence is as follows:

[0020]

[0021] The system uses Logistic mapping to generate a chaotic sequence x of length β i,k , as shown in formula (2):

[0022]

[0023] where i=1,2,...,β,x i ∈{-1,+1}. It can be seen from the Logistic mapping characteristics: E(x i,k )=0, var(x i,k )=1 / 2,

[0024] In the OMU-DCSK system, the chaotic signal x i,k First used as a reference signal modulated by a cosine carrier, then x i,k A chaotic signal orthogonal to it is generated by the Hilbert transform signal x i,k and At the same time, it is combined with Walsh code as an information bearing signal to transmit user information, and then modulated by...

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Abstract

The invention discloses an improved orthogonal multi-user differential chaotic communication system, and belongs to the field of communication systems. Reference signals and information signals are separated by replacing traditional time division multiple access with I / Q modulation, so that the transmission rate is increased, and the problem of radio frequency delay is solved; in order to furtherimprove the transmission rate, Hilbert transform and Walsh codes are combined to transmit 2N user information. The receiving end multiplies the received information signal by the corresponding sine and cosine carriers by adopting a non-correlation demodulation mode, and then respectively sends the obtained signals to a matched filter so as to respectively demodulate an information estimation signal and a reference estimation signal. After I / Q demodulation, correlation operation is performed on the reference estimation signal, the information estimation signal and the corresponding Walsh code to demodulate the first N user information; and meanwhile, the same operation is executed on the reference estimation signal and the information estimation signal after the Hilbert transform to demodulate the N user information. Compared with a traditional multi-user chaotic communication system, the scheme has more excellent performance, so that the scheme has a good application prospect in the field of wireless communication.

Description

technical field [0001] The present invention aims to design a kind of improved orthogonal multi-user differential chaotic communication system (OMU-DCSK), utilize I / Q modulation and Hilbert transform technology to improve differential chaotic shift keying (DCSK) system, make Its transfer rate is significantly improved. Background technique [0002] Chaotic signals are highly valued in the field of communication because of their characteristics of quasi-randomness and good auto(mutual) correlation. At present, the research and development of chaotic signals has been designated as a long-term research project by the European Technology Development Alliance Committee. As one of the three chaotic security technologies, the chaotic digital modulation technology uses the chaotic signal generated by the chaotic map to replace the carrier wave in digital communication, which can realize modulation and spread spectrum at the same time, and has a high development potential. Chaotic ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L9/00H04J13/00
CPCH04L27/001H04L9/001H04J13/0048
Inventor 张刚赵畅畅和华杰曾光辉黄南飞张天骐
Owner CHONGQING UNIV OF POSTS & TELECOMM
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