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Orthogonal modulated chaos communication method

A technology of chaotic communication and quadrature modulation, applied in the direction of modulated carrier system, digital transmission system, electrical components, etc., can solve the problems of high bit error rate, complex structure of transmitter and receiver, etc. Improved code performance and easy hardware implementation

Inactive Publication Date: 2007-08-29
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to combine the respective advantages of QCSK and QAM, overcome the complex structure of the transmitter and receiver of the QCSK system, and the defects of high bit error rate, and propose a quadrature modulation corresponding to the quadrature modulation scheme in traditional digital communication Chaotic communication scheme, which has stronger ability to resist channel noise and multipath interference than QCSK scheme

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Embodiment Construction

[0021] The present invention will be described further in conjunction with accompanying drawing now.

[0022] The principle diagram of the present invention is as shown in accompanying drawing 3, and wherein s is a single bit input signal, and bit sign is taken +1 or-1 equally roughly, and period is T b =2N, the energy is E b . After the s string is parallel exchanged, it is divided into two equal-length sequences s 1 and s 2 ,Right now

[0023] s ( m ) 1 = s ( 2 m - 1 ) , m=1,2 ,…N

[0024] s ( m ) 2 = s ( 2 ...

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Abstract

Using Schimidt orthogonalization for chaos sequence set. The method generates a series of orthogonal basis functions as carrier waves. Then, using orthogonal amplitude modulation carries out modulation / demodulation. Features are: simple system structure, easy of realization through hardware, and higher interference killing feature than that of QCSK scheme.

Description

technical field [0001] The invention belongs to the field of chaotic signal communication, in particular to an orthogonal modulation chaotic signal communication method. technical background [0002] The proposed chaos-based quadrature modulation scheme QCSK (Quadrature Chaos Shift Keying), whose principle is shown in Figure 1, is a chaotic communication scheme corresponding to the QPSK (Quadrature Phase Shift Keying) scheme in traditional digital communication. The basic idea of ​​this scheme is to use the method of Fourier series expansion to generate two chaotic signals which are orthogonal within a certain time interval as carrier basis functions. Its modulation / demodulation part is similar to that of the DCSK scheme, and the signal constellation diagram is four-phase. Its advantage is that it does not need to transmit orthogonal signals in the channel. Compared with the DCSK (Differential Chaos Shift Keying) scheme, its bit error rate BER (Bit Error Rate) performance i...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L27/36
Inventor 陈宏滨冯久超
Owner SOUTH CHINA UNIV OF TECH
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