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Research on Hybrid Modulated Ultra-Wideband and Power Spectral Estimation of PAM-DS-UWB Based on Chaotic Sequences

Author: WangHongLei
Tutor: YuYinHui
School: Jilin University
Course: Communication and Information System
Keywords: Ultra-Wideband Pulse amplitude modulation Pulse position modulation Chaotic sequence Power spectral density
CLC: TN925
Type: Master's thesis
Year: 2008
Downloads: 149
Quote: 0
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Abstract


In recent years, ultra- wideband (UWB) wireless communication has been a great concern of academia and the business community . For the low reliability of the traditional single ultra-wideband communication system , combined with the pulse amplitude modulation , pulse position modulation principle , constructed blend of ultra-wideband signal communication system , a detailed analysis of the system in AWGN channel and performance under multipath channel simulation , simulation results show that : compared with the PAM-DS-UWB signal , ultra-wideband hybrid modulation signal error performance is superior to the PAM-DS-UWB signal . Study ultra-wideband communication system spectrum coexistence and compatibility problems with other communication systems , ultra-wideband signal power spectral distribution is an important factor to consider . Chaotic sequence is introduced to the signal of direct sequence ultra wideband (DS-UWB) communication system using MATLAB simulation tools make the power spectral density plot of the PAM-DS-UWB signals using different spreading sequences , chaotic sequence analysis of the different impact on the distribution of power spectral density . The simulation results show that : compared with the traditional sequence spread spectrum sequences Gold , PAM-DS-UWB signal power introduced Logistic chaotic sequence in the entire spectrum of the most widely distributed Logistic chaotic sequence Chebyshev chaotic sequence PAM-DS-UWB signal Gold sequences PAM-DS-UWB signal power spectral density of the peak power spectral density peak were approximately half and two-thirds .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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