Efficient chaotic communication scheme based on orthogonal chaotic generator

A technology of chaotic signals and communication schemes, applied in digital transmission systems, electrical components, modulated carrier systems, etc., and can solve the problems of low transmission rate and poor bit error performance.

Inactive Publication Date: 2016-08-31
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose an improved scheme for DCSK aiming at defects such as low transmission rate or poor bit error performance existing in the existing improved DCSK technology

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  • Efficient chaotic communication scheme based on orthogonal chaotic generator
  • Efficient chaotic communication scheme based on orthogonal chaotic generator
  • Efficient chaotic communication scheme based on orthogonal chaotic generator

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Embodiment Construction

[0016] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0017] figure 1 Give the frame structure of the kth frame signal of OHE-DCSK system. Each frame contains N pieces of length T s equal-length time slots; each time slot transmits a chaotic sequence with a length of β, that is, the spreading factor is β; b j Indicates the modulated data bits in the jth time slot of the kth frame. The following analysis takes frame k as an example. S is transmitted in the first time slot of the kth frame 1 =b 1 x k , where X k =[x k (1),x k (2),...,x k (β)] is a chaotic sequence with length β. The second time slot transmits S 2 =b 2 S 1 =b 2 b 1 x k , it takes the signal S in the first time slot as 1 as a reference signal. The Nth time slot not only transmits the current signal b N S N-1 , which also includes the which is

[0018] figure 2 Design an orthogonal chaotic...

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Abstract

The invention provides an efficient chaotic differential communication scheme based on an orthogonal chaotic generator, and belongs to the field of communication systems. A DCSK (Differential Chaos Shift Keying) signal frame is extended in order that each frame includes N equal-length time slots, and a system modulates chaotic carrier waves in the time slots, namely, each time slot carries 1 bit of user data. Each time slot takes a signal in a previous time slot as a reference signal. A reference signal of a first time slot is in a last time slot of a previous frame, namely, a last time slot of each frame carries user information of the time slot and a signal which can be converted into a reference signal of a next frame. Meanwhile, the orthogonal chaotic generator is designed to generate strictly-orthogonal chaotic signals in order that the chaotic carrier wave of each frame and a carrier wave of an adjacent frame are kept orthogonal, and the system is free from inner-signal interference. An incoherent demodulation way is adopted at a demodulation end; correlation operation is performed on signals in front and back adjacent frames through a correlator; and user data can be judged through a judgement threshold. According to the scheme, the transmission rate is two times that of DCSK, and bit error rate performance is superior to that of DCSK in any signal-to-noise ratio range.

Description

technical field [0001] The present invention aims to design a high-efficiency differential chaotic communication scheme (OHE-DCSK) based on an orthogonal chaotic signal generator, specifically to improve the differential chaotic shift keying (DCSK) technology to double its transmission rate and greatly improve its bit error rate performance. Background technique [0002] As a technology in the IEEE802.11 WLAN standard, DCSK is a mainstream non-coherent chaotic digital modulation scheme. Recently, DCSK technology has been applied to the IEEE 802.15.4a low-speed ultra-wideband standard. DCSK technology uses the transmitted-reference (T-R) method to send both the reference carrier and the information-carrying signal to the receiver. It does not need to complete the channel estimation and spread spectrum code synchronization necessary for the traditional spread spectrum communication system, which greatly simplifies the system. structure and has strong anti-fading characterist...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/001
Inventor 张刚王传刚孟维
Owner CHONGQING UNIV OF POSTS & TELECOMM
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