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Demodulation method and device for a differential chaotic keying ultra-wideband communication system

A technology of differential chaotic keying and ultra-wideband communication, which is applied in the field of communication and can solve the problem of low bit error performance of the demodulation method

Active Publication Date: 2020-10-23
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a demodulation method and device of a differential chaotic keying ultra-wideband communication system, which is used to solve the poor bit error performance of the demodulation method of the existing differential chaotic keying ultra-wideband communication system caused by narrowband interference. low problem

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  • Demodulation method and device for a differential chaotic keying ultra-wideband communication system
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  • Demodulation method and device for a differential chaotic keying ultra-wideband communication system

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Embodiment 1

[0061] The following introduces Embodiment 1 of a demodulation method of a differential chaotic keying ultra-wideband communication system provided by the present invention, see figure 1 , embodiment one includes:

[0062] Step S100: Receive a modulated signal on a channel of a differential chaotic keying ultra-wideband communication system.

[0063] Step S101: Obtain the first row vector and the second row vector in the M-order walsh code matrix, wherein M is an integer power of 2, and the first row vector and the second row vector are the M-order walsh Any two row vectors in the code matrix.

[0064] Step S102: Calculate a decision variable according to the modulation signal, the first row vector, the second row vector, and the guard interval duration of the differential chaotic keying UWB communication system.

[0065] Wherein, the calculation formula of the decision variable is as follows: decision variable Z=Q 1 -Q 0 . in, the y 1 (t)=r 1 2 (t), Where r(t) is ...

Embodiment approach

[0097] As an implementation manner, the row vector obtaining module 200 is specifically configured to: obtain the first row vector and the second row vector in the second-order walsh code matrix, wherein the first row vector is (+1,+1 ), the second row vector is (+1,-1).

[0098] As an implementation manner, the demodulated signal obtaining module 400 includes:

[0099] judging unit: used to judge the size relationship between the judgment variable and 0;

[0100] The first result unit: used to obtain the demodulated signal +1 when the decision variable is greater than 0;

[0101] The second result unit: used to obtain the demodulated signal -1 when the difference is less than 0.

[0102] The demodulation device of a differential chaotic keying ultra-wideband communication system in this embodiment is used to implement the aforementioned demodulation method of a differential chaotic keying ultra-wideband communication system, so the specific implementation of the device can ...

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Abstract

The invention discloses a demodulation method of a differential chaotic keying ultra-wideband communication system; after receiving the modulated signal on the channel of the differential chaotic keying ultra-wideband communication system, any two row vectors in the M-order walsh code matrix will be obtained, and then the decision variable will be calculated according to the modulated signal, thetwo row vectors and the guard interval duration, finally the demodulated signal will be obtained according to the decision variable. It can be seen that this method uses two line vectors to modulate the modulated signal, and after the square operation and the fourth-order moment operation, the majority of the modulated signal energy and the Gaussian white noise energy are moved to 0 Hz, and the energy of the DC component is subtracted, which achieves the purpose of eliminating the narrow-band interference and significantly improves the bit error performance. In addition, the invention also provides a demodulating device of a differential chaotic keying ultra-wideband communication system, and the function of the demodulating device corresponds to the function of the method.

Description

technical field [0001] The invention relates to the communication field, in particular to a demodulation method and device for a differential chaotic keying ultra-wideband communication system. Background technique [0002] Wireless communication technology is a key player in the evolution of the communication field. With the continuous improvement of people's requirements for wireless communication, it is hoped that they can get communication services with high transmission rates anytime and anywhere. Under the background of such demands, ultra wide band (Ultra Wide Band, UWB) technology has received extensive attention. [0003] Chaotic wireless communication is a wireless communication system using chaotic signal as carrier and digital modulation. The generation circuit of chaotic signal is simple, and the signal has natural broadband spectrum characteristics, so chaotic wireless ultra-wideband wireless communication system based on chaotic digital modulation technology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00
CPCH04L27/001
Inventor 方毅马焕蔡国发张玉韩国军
Owner GUANGDONG UNIV OF TECH
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