UWB信号波形及功率谱密度的分析  

Pulse Shape of UWB Signals and PSD Analysis

作　　者：陆旻琪[1] 汪敏[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2005年第4期335-340,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市重点学科建设项目(200144)

摘　　要：文章首先分析了理想随机的双极性数字调制UWB脉冲信号的功率谱密度,提出以高斯脉冲的高阶导数作为发射波形可以满足FCC对UWB信号的频谱规定;随后研究了DSBPSK调制扩频方式下UWB信号的功率谱密度,计算了采用多种类型的扩频码序列和不同码长情况下UWB信号的PSD.The spectrum of ideal stochastic bi-phase modulated UWB signals is analyzed. It is shown that using a high-order derivative of the Gaussian function as the USB pulse can satisfy the FCC emission limits for UWB systems. Power spectrum density （PSD） of the DS-BPSK UWB signals is then studied. Finally, the PSD of DS-BPSK UWB signals using different types of spreading codes and different code lengths are calculated. It is shown that a proper selection of modulation schemes, the spreading code and the code length is essential to the generation of UWB signals with smooth spectra and low spectral levels.

关 键 词：超宽带 直接序列扩频-二进制相移键控 功率谱密度 

分 类 号：TN911[电子电信—通信与信息系统] TN934[电子电信—信息与通信工程]