基于混沌码的直接序列超宽带信号功率谱研究  

Study on Power Spectral Density of Direct Sequence-Ultra Wideband Based on Chaotic Sequence

作　　者：王洪磊[1] 于银辉[1] 史贺[2] 

机构地区：[1]吉林大学通信工程学院,长春130012 [2]吉林省高速公路管理局,长春130022

出　　处：《吉林大学学报（信息科学版）》2008年第4期338-342,共5页Journal of Jilin University（Information Science Edition）

基　　金：教育部科学技术研究重点基金资助项目(7150080050)

摘　　要：为了减小超宽带通信系统对其他通信系统造成的干扰,将混沌扩频序列引入到直接序列超宽带信号(DS-UWB:Direct Sequence-Ultra WideBand)通信系统中,推导了DS-UWB信号的功率谱密度。应用Matlab仿真工具作出3种不同扩频序列的PAM-DS-UWB(Pulse Amplitude Modulation-Direct Sequence-Ultra WideBand)信号的功率谱密度图,分析了不同的混沌扩频序列对功率谱密度分布的影响。仿真结果表明,与传统的Gold扩频序列相比,引入混沌扩频序列的PAM-DS-UWB信号的功率在整个频谱中分布更广,Logistic混沌扩频序列和Chebyshev混沌扩频序列的PAM-DS-UWB信号功率谱密度峰值分别约为Gold序列的PAM-DS-UWB信号功率谱密度峰值的1/2和2/3。In order to reduce the interference between ultra-wideband communication systems and other commu nication systems, the DS-UWB （Direct Sequence-Ultra WideBand） communication systems using different chaotic spread sequence are proposed, the PSD （Power Spectral Density） of DS-UWB is carried out, the charts for PSD of PAM-DS-UWB （Pulse Amplitude Modulation-Direct Sequence-Ultra WideBand） using different spread sequences are established by Matlab, the effect of PSD mask using different chaotic spread sequence is analyzed. Comparing with the conventional Gold sequence, the simulation results show that the power of PAM-DS-UWB u- sing different chaotic spread sequence is broader in the spectrum ; the peak value in PSD of PAM-DS-UWB using Logistic sequence, Chebyshev sequence is approximately the half and two-thirds of the peak value in PSD of PAM-DS-UWB using the Gold sequence.

关 键 词：超宽带 直接序列扩频 混沌序列 功率谱密度 

分 类 号：TN911[电子电信—通信与信息系统]