一种新的直扩超宽带系统快速同步方案  

A new rapid acquisition scheme for DS-UWB system

作　　者：王江[1] 毕光国[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《电路与系统学报》2005年第3期120-123,139,共5页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60496311)

摘　　要：本文提出了一种新的基于能量窗的直扩超宽带系统码片同步方法,通过设计具有重复特性的码来提高能量窗的信噪比,从而可以较为准确地获得码片同步,并将窗口中的信息作为接收端本地信号与接收信号进行匹配接收,这样可以在未知接收信号相位的情况下有效地接收多径能量,提高接收信噪比。在完成码片同步之后再进一步进行PN码的相位同步,这里以线性搜索为例分析得到超宽带信号总的平均同步时间,并与现有的超宽带同步方案进行了比较,新方案将信号捕获分成两部分完成,大大降低了超宽带信号捕获时间。In this paper, a new chip acquisition scheme, based on energy window, is proposed for DS-UWB system. To improve the signal to noise ratio in the energy window, a preamble with repetition property is employed. The new scheme separates the acquisition procedure into two steps: chip acquisition and PN code synchronization. Once the chip acquisition achieved, the multipath components can be acquired without the knowledge of channel information, by utilizing the samples in energy window as the local template waveform. Further theoretical analysis and computer simulation show that, the acquisition time of proposed scheme is reduced significantly compared with conventional methods.

关 键 词：超宽带通信 同步 能量窗 

分 类 号：TN929[电子电信—通信与信息系统]