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Differential chaotic shift keying modulation and demodulation device based on code subscript modulatio

A modulation and demodulation and chaotic technology, which is applied in the field of differential chaotic shift keying modulation and demodulation devices, can solve the problems of bit energy loss, low data transmission rate and low energy efficiency, and achieve energy saving, increase data transmission rate, increase The effect of large bandwidth

Inactive Publication Date: 2016-12-07
XIAMEN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a differential chaotic shift keying modulation and demodulator based on code subscript to address the shortcomings of half a bit energy loss in the existing differential chaotic shift keying modem, which leads to problems such as low data transmission rate and energy efficiency of the system. Chaotic Shift Keying Modulation and Demodulation Device

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  • Differential chaotic shift keying modulation and demodulation device based on code subscript modulatio
  • Differential chaotic shift keying modulation and demodulation device based on code subscript modulatio
  • Differential chaotic shift keying modulation and demodulation device based on code subscript modulatio

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[0020] The following computer-based simulation process further elaborates the implementation method of the present invention. If the chaotic carrier is generated by discrete Logistic mapping, the sampling frequency of the signal is set to f s =1000 times / second, the duration of the bit is T=0.048 seconds, then the equivalent spreading factor is defined as β=T×f s =48. The Logistic mapping equation of chaotic carrier is k=0,.....,i,....., when the initial value is given x(0), through the iterative formula x(i+1)=1-2×x 2 (i), i=0,....,i,....,β-1, can generate a chaotic carrier sequence with a length of β (spreading factor β) The M-order Walsh code construction method is: W m =[W m-1 ,W m-1 ;W m-1 ,-W m-1 ], W 1 =[+1,+1;+1,-1], where

[0021] According to the chaotic carrier sequence generated above, the modulator consists of figure 1 The modulator shown performs the modulation, and its transmitted signal in each symbol period can be expressed by the following form...

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Abstract

The present invention relates to digital modulation and demodulation of wireless communications, more particularly to a differential chaotic shift keying modulation and demodulation device based on the code subscript modulation. The modulation and demodulation device is provided with a modulator and a demodulator, wherein the modulator is provided with a chaotic carrier generator G; a delay unit D1; a multiplier a; a multiplier b; a bit-to-symbol converter f; a bit-to-symbol converter g; a Walsh code selector S; a square-wave generator e and a modulator transfer switch Q1; and the demodulator includes a receiver R; a delay unit D2; M square-wave generators S<1>, S<2>, ..., S<M>; M first-path multipliers M<1, 1>, M<1, 2>, ..., M<1, M>; M second-path multipliers M<2, 1>, M<2, 2>, ..., M<2, M>; M accumulators Ac<1>, Ac<2>, ..., Ac<M>; M absolute value pickers Ab<1>, Ab<2>, ..., Ab<M>; a comparator C; a demodulator transfer switch Q2; a resolver h and a symbol-to-bit converter k.

Description

technical field [0001] The invention relates to digital modulation and demodulation of wireless communication, in particular to a differential chaotic shift keying modulation and demodulation device based on code subscript modulation. Background technique [0002] Differential Chaotic Shift Keying (DCSK: Differential Chaotic Shift Keying) is a kind of digital modulation and demodulation technology with chaotic signal as the carrier. The wide spectrum of chaotic signals makes DCSK an excellent spread spectrum communication technology and an alternative to traditional spread spectrum technology. DCSK technology has strong competitiveness in anti-multipath interference and low-cost ultra-wideband communication systems, and has good application prospects in the field of short-distance wireless communication. [0003] The existing differential chaotic shift keying modulator includes chaotic carrier generator, delay unit, bit-to-symbol converter, multiplier and switch; the demodu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/34
CPCH04L27/001H04L27/3405
Inventor 徐位凯谭云生王琳洪少华
Owner XIAMEN UNIV
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