Modulating and demodulating method for orthogonal differential chaos phase shift-keying of digital signal

A phase shift keying, digital signal technology, used in digital transmission systems, modulation carrier systems, error prevention and other directions

Inactive Publication Date: 2009-04-01
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these two methods still have room for improvement, and in today's increasingly tight frequency band res

Method used

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  • Modulating and demodulating method for orthogonal differential chaos phase shift-keying of digital signal
  • Modulating and demodulating method for orthogonal differential chaos phase shift-keying of digital signal
  • Modulating and demodulating method for orthogonal differential chaos phase shift-keying of digital signal

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Experimental program
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Embodiment

[0039] Embodiment: Hilbert transform is used for the selection of orthogonal transformation, and when the number of chaotic samples generated in half a symbol period (T / 2) is L=64, the conditions of M=4 and 8 are respectively adopted for implementation.

[0040] sender

[0041] 1. According to the chaotic signal generated by the chaotic signal generator, use the Hilbert transform to generate two orthogonal bases. In the time [0, T], c x (t) is a chaotic sequence generated by a chaotic generator, and its Fourier expansion can be obtained

[0042]

[0043] is generated by the Hilbert transform

[0044]

[0045] Among them, ω=2π / T, f k is the magnitude of each frequency component after Fourier series expansion, is the phase of each frequency component, E b is the energy of the sample function within one symbol period.

[0046] 2. Generate M different chaotic phase signals according to the two orthogonal bases, such as error! Reference source not found. where M delays ...

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Abstract

The invention discloses a digital signal orthogonal differential chaos shift keying modulation and demodulation method, namely, chaos phase is used for coding a multidigit binary number, orthogonal transform is carried out on a chaos sequence for generating a new sequence, and mutually orthogonally orthogonal basis functions which are used as carriers are formed with the original chaos sequence for modulation and demodulation. Compared with a quadruple chaos shift keying (QCSK), the invention improves the bandwidth utility ratio, increases the transmission speed, and reduces the error rate to a certain extent.

Description

technical field [0001] The invention belongs to the field of chaotic signal communication, and relates to a method for modulating and demodulating digital signals by using a chaotic phase and quadrature method, in particular to a modulation and demodulation method for digital signal quadrature differential chaotic phase shift keying. Due to the characteristics of chaotic signals, this modulation method has good broadband characteristics and can be applied to various wireless communication systems. technical background [0002] In recent years, chaotic communication technology has become one of the research hotspots. Compared with the traditional communication technology, the chaotic communication system has the advantages of good confidentiality and strong anti-interference. Because so far, under actual channel conditions, there is still no effective and reliable method to realize chaos synchronization at the receiving end, so as to demodulate the signal. Therefore, most o...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L1/00
Inventor 朱松盛殷奎喜赵华张羽闾国年
Owner NANJING NORMAL UNIVERSITY
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