DS-UWB信号伪码周期的谱估计  

Period Estimation of PN Sequence Based on Spectrum of DS-UWB Signal

作　　者：李雪松[1] 张天骐[1] 杨柳飞[1] 代少升[1] 

机构地区：[1]重庆邮电大学信号处理与片上系统研究所,重庆400065

出　　处：《系统仿真学报》2009年第10期3074-3078,3095,共6页Journal of System Simulation

基　　金：国家自然科学基金-中物院NSAF联合基金项目(10776040);国家自然科学基金项目(60602057);新世纪优秀人才支持计划资助NCET;重庆市科委自然科学基金项目(CSTC;2006BB2373);重庆市教委自然科学基金项目(KJ060509);重庆邮电大学自然科学基金项目(A2006-04;A2006-86)

摘　　要：针对接收端接收到缺乏先验知识的超宽带信号以后,如何确定其伪噪声(PN)码周期的难题,提出了一类基于信号功率谱二次处理的方法。该方法首先对直接序列扩频超宽带信号的功率谱进行估计,然后把估计出的信号功率谱作为输入信号再求功率谱,发现信号的二次功率谱脉冲位置与PN码周期密切相关,将本方法运用于非合作方式通信信号估计场合,只要检测出其相邻脉冲峰值的间隔就能估计出PN码的周期。最后通过计算机模拟程序验证了该方法在较低的输入信噪比条件下与理论分析结果一致,显示了该方法的有效性。A kind of method based on the reprocessing of the power spectrum of signals was proposed. It can solve the difficult problem of periodic detection of the PN sequence in the receiving of UWB signals without the prior knowledge. The method estimate the power spectrum density of the direct sequence ultra wideband （DS-LrWB）, then regard this power spectrum as signal and compute power spectrum density again, it＇s discovered that the pulses location of power spectrum reprocessing result of the DS-UWB signal is associated with period of PN sequence. The method can be applied to signal estimate of non-cooperate communication, if the distance of pulse peak of power spectrum reprocessing is scanned and the period of PN sequence can be estimated. The computer simulation validates that this method working in lower SNR is coincident with theoretical analysis, and it shows that the algorithm is effective.

关 键 词：信号处理 DS-UWB 占空比 功率谱密度 PN序列 

分 类 号：TN911.72[电子电信—通信与信息系统]