UWB-OFDM系统的符号盲同步方法  

A Robust Blind Symbol-Timing Synchronization for UWB-OFDM Systems

作　　者：李长青[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：《电子与信息学报》2007年第8期1895-1899,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60472070);教育部科学技术研究重点项目(105035);高等学校博士学科点专项科研基金(20050013005)资助课题

摘　　要：该文提出一种适合于UWB-OFDM系统的符号盲同步方法。该方法是基于UWB-OFDM符号中的ZP功率出现规律性的分布特性,利用滑动窗能量检测的办法来进行符号同步。研究了高斯信道和UWB信道下的符号同步方法,并详细分析了UWB信道下接收信号的能量分布特性。为了提高同步性能,设计了多滑动窗方法代替双滑动窗方法。计算机仿真分析表明该方法无论在高斯还是UWB信道下都具有优异的性能。A robust blind symbol-timing synchronization scheme applicable to UWB-OFDM systems is presented. The proposed method is based on ZP（Zero-padded Prefix） power collection in the UWB-OFDM symbols whose ZP average power distribute regularly in the slide windows. The synchronization schemes in both Gaussian channel and UWB channel are investigated. Average power distribution of the received signal in UWB channel is analysed detailedly in order that symbol synchronizes accurately. A multi_slide_windows method is designed in order to improve the performance of synchronization. Finally computer results are also demonstrate the superior performance of the new method in both Ganssian channel and UWB channel.

关 键 词：符号定时同步 UWB-OFDM CP-OFDM 能量检测 S-V信道模型 多滑动窗 

分 类 号：TN919.72[电子电信—通信与信息系统]