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Multiuser chaotic communication scheme based on time inversion with multiple inputs and single outputs

A technology of time reversal and chaotic communication, which is applied to secure communication through chaotic signals, secure communication devices, transmission systems, etc., can solve the problems of low DCSK transmission rate, achieve the effect of simple structure and reduce bit error rate

Inactive Publication Date: 2018-12-25
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] Aiming at the problem of low DCSK transmission rate and further improving bit error performance, the present invention proposes a multiple-input single-output multi-user chaotic communication system based on time reversal

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  • Multiuser chaotic communication scheme based on time inversion with multiple inputs and single outputs
  • Multiuser chaotic communication scheme based on time inversion with multiple inputs and single outputs
  • Multiuser chaotic communication scheme based on time inversion with multiple inputs and single outputs

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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 MISO-TRM-DCSK system modulation block diagram, specific steps:

[0019] The system uses Logistic mapping to generate a chaotic sequence y of length b i , and then through the sign function to form a chaotic signal x with constant bit energy i , as shown in the following formula (1):

[0020]

[0021] In formula (1), i=(0,1,2,...β), x i ∈ {-1,+1}, E(x i )=0,var(x i )=1.

[0022] In the MISO-TRM-DCSK system, the chaotic signal x i As a reference signal, in the information time slot after each delay line, time inversion is used to distinguish different users, so that two-bit information signals can be transmitted after each delay line. The frame structure diagram of the system is as follows figure 2 shown.

[0023] Such as figure 1 As shown, in the MISO-TRM-DCSK system, in th...

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Abstract

The invention relates to a multi-input single-output multi-user chaotic communication scheme based on time inversion, which belongs to the communication system field. By using time inversion to superimpose two information signals after each delay line, the purpose of transmitting two-bit information signals is achieved. Combined with the low bit error rate of multi-antenna technology, the BER performance of the system is greatly improved. The receiving end adopts the uncorrelated demodulation mode to correlate the received information signal with the signal after delaying the corresponding time interval, and then the first user in the path delay can be recovered after passing the decision threshold. Then the delayed signal is correlated with the received signal after time inversion, and the second user in the delay is recovered after the decision threshold. Compared with the traditional multi-user chaotic communication system, this scheme has better performance, and has a good application prospect in the field of wireless communication.

Description

technical field [0001] The present invention aims to design a multiple-input single-output time-reversal-based multi-user differential chaotic keying communication scheme (MISO-TRM-DCSK), which combines differential chaotic shift keying (DCSK) technology with time-reversal (Time Reverse) technology combined to improve its transmission rate, and use multi-antenna technology to improve the bit error performance of the system. Background technique [0002] Nonlinear science is a basic science that studies the commonness of nonlinear phenomena, and is known as the "third revolution" of natural science in the 20th century. As an important branch of nonlinear science, the research and application of chaos theory has become a very attractive research topic. Due to the characteristics of good aperiodicity, inherent randomness, noise-like property and very sensitive to the initial conditions of the system, chaotic signals have great practical application value in secure communicatio...

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Application Information

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IPC IPC(8): H04L9/00H04L27/00H04B7/0404
CPCH04B7/0404H04L9/001H04L27/001
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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