一种多径超宽带系统符号同步方案的实现  

On realization of symbol timing with UWB systems in the multipath environment

作　　者：赵为春[1] 刘丹谱[1] 乐光新[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《通信学报》2004年第12期158-165,共8页Journal on Communications

基　　金：国家"863"基金资助项目(2003AA123240)

摘　　要：以Intel提出的S_V信道模型为基础,给出了一种并行自相关符号定时同步的实现算法,与传统方法不同,该同步算法利用了超宽带信号的周期相关特性,用接收信号作为本地样本信号。为了提高本地样本信号的精度,本文设计了一个判决反馈回路不断地修正本地样本信号,使本地样本信号更好地与接收信号匹配,以获得大的能量输出,从而提高了同步时间的收敛速度。仿真结果表明,与以前文献提出的"UWB系统同步时间在毫秒级"的结论不同,该电路可以在微秒级时间内实现准确、快速地同步。A realization of symbol timing was described, which was based on the widely accepted Intel S_V channel model. Because of the cyclostationary characteristics of UWB symbols, we adopt the modified received waveform as the local template in this proposed paralleled synchronization circuit, which was different from the traditional method. By this way, the local template could match the received signals better. The simulations show that the method proposed by this paper can find the symbol timing accurately and make the acquisition rapidly.

关 键 词：UWB 同步 RAKE接收机 捕获 跟踪 

分 类 号：TN929.5[电子电信—通信与信息系统]