Orthogonal multi-user chaos shift keying communication scheme

A communication scheme and multi-user technology, applied in multiplex communication, code division multiplexing system, digital transmission system, etc., can solve the problem of low DCSK transmission rate

Inactive Publication Date: 2019-03-01
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Aiming at the problem of low DCSK transmission rate, the present invent

Method used

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  • Orthogonal multi-user chaos shift keying communication scheme
  • Orthogonal multi-user chaos shift keying communication scheme
  • Orthogonal multi-user chaos shift keying communication scheme

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Embodiment Construction

[0015] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0016] figure 1 A quadrature chaotic signal generator is given. First, the switches are turned on at the same time. After β / 2, the switches are turned off at the same time. In a β time, the two signals in the first half are the same, and the two signals in the second half are opposite, so that two orthogonal chaotic signals can be formed. The expressions of the two signals are:

[0017] x i =x i+β / 2 ,mβ

[0018] the y i =-y i+β / 2 ,mβ

[0019] Also meet:

[0020]

[0021] The OMU-DCSK system first adds the two signals generated by the orthogonal chaotic signal generator together as a reference signal, with a total delay of 2M, and each delay line transmits N users, and these N users are transmitted in the same information signal, with different Users are identified by Walsh codes. The sys...

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Abstract

The invention requests for protecting an orthogonal multi-user chaos shift keying communication scheme, and belongs to the field of communication systems. A system utilizes an orthogonal chaos signalgenerator to generate two orthogonal chaos signals, and the two orthogonal chaos signals are added together to serve as a reference signal. Different information signals are distinguished by delayingfor different times; each information signal transmits N pieces of user information that are distinguished by Walsh codes; the first and second orthogonal chaos signals are sequentially taken to be multiplied with user information added together to acquire an information signal. By using the orthogonal chaos signal generated by the orthogonal chaos signal generator, the interference in the signalcan be thoroughly eliminated, and the bit error rate performance of the system can be effectively improved. The scheme deduces and simulates a bit error rate formula under AWGN and Rayleigh fading channels. A simulation result indicates that the system can enhance the transmission speed and improve the bit error rate, and has good application value.

Description

technical field [0001] The present invention aims to design an Orthogonal Multi-User Differential Chaos Keying Communication Scheme (OMU-DCSK), which improves its transmission rate on the original Differential Chaos Shift Keying (DCSK) technology, and through the orthogonal chaos signal The generator eliminates interference within its signal, improving its bit error performance. Background technique [0002] In the middle of the 19th century, chaos entered the field of vision of scientists for the first time. In 1990, the US Navy discovered the phenomenon of chaos synchronization. Since then, chaos has entered the research of digital communication. Chaos replaces the original sine and cosine signals as the carrier wave of chaotic digital communication. The generation of chaotic signals is simple, and at the same time, it has good correlation and cross-correlation. The good properties of chaos make it widely used in digital communication. [0003] At present, the most wide...

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Application Information

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IPC IPC(8): H04L27/00H04J13/00
CPCH04J13/0018H04J13/0048H04L27/001
Inventor 张刚陈和祥徐联冰许嘉平张天骐
Owner CHONGQING UNIV OF POSTS & TELECOMM
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