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Research on Linear Frequency Modulation Interference Suppression in Meteor Burst Communications

Author: HanSen
Tutor: LiZan
School: Xi'an University of Electronic Science and Technology
Course: Military Communication
Keywords: Meteor burst communication Two Dimensional Spread Spectrum Fractional Fourier Transform LFM interference
CLC: TN926.5
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


Meteor burst communication is a burst of communication , the channel environment is relatively poor , there are a variety of narrow-band interference and broadband interference , which the linear FM interference is a typical broadband non - stationary interference traditional narrowband interference suppression techniques do not work well be effectively suppressed , which can seriously degrade the BER performance of the meteor burst communications receiver . To solve this problem , this paper discusses the meteor burst communication based on fractional Fourier transform of the linear FM interference suppression technology , software simulation proved the validity of the method . This paper first introduces meteor burst communication development as well as the physical characteristics of the channel ; then introduces the basic principles of the two-dimensional spread spectrum communication and gives the mathematical model of the linear frequency modulation interference , simulation results show that a serious deterioration in the two-dimensional linear FM interference BER performance spread spectrum receiving end ; followed by a new time- frequency analysis tool - fractional Fourier transform , including its mathematical theory , the basic nature of the two commonly used discrete algorithms , simulation results show that the linear FM interference in the fractional Fourier domain has obvious impulse function characteristics ; Finally, in the two-dimensional spread spectrum system of linear FM interference suppression technology , in the analysis of the existing use of fractional Fourier transform to convert the signal to the fractional Fourier domain interference suppression algorithm based on the study of a new use of fractional Fourier transform interference suppression algorithm , computer simulation show that the algorithm can effectively inhibit the two-dimensional chirp spread spectrum systems interference and improve the BER performance of the receiver . The algorithm is relatively simple, less computation , has a better application prospect .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Scatter Communication > Meteor Burst Communication
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