短突发系统数据辅助载波同步的导频设计  

Pilot Design of Data-aided Carrier Synchronization for Short Burst Transmission

作　　者：孙锦华[1] 王雪梅[1] 吴小钧[2] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071 [2]长安大学信息工程学院,西安710064

出　　处：《电子与信息学报》2014年第3期669-675,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60902039;61271175);中央高校基本科研业务费专项资金(K50511010014;K5051201043;CHD2011JC088);长安大学基础研究支持计划资助课题

摘　　要：对于短突发通信系统,基于时域相关函数数据辅助的频率估计方法中导频位置、导频数目对载波频率估计精度和估计范围有很大的影响,该文提出一种具有较高估计精度的基于相关函数和的频率估计算法,并推导出该算法的理论估计方差。通过分析导频位置对估计范围和估计精度的影响,提出一种可变D间距数据帧结构(VDPM)设计方案,即根据系统估计精度和估计范围的要求选择合适的导频间距。理论分析和仿真结果表明VDPM帧结构可以灵活地兼顾估计精度和估计范围的要求,基于相关函数和的频率估计算法仅利用很短的导频符号就能达到较高的估计精度,适合在短突发通信系统中应用。For short burst communication systems, the position and the number of pilot symbols have a great impact on frequency estimation accuracy and estimation range in time-domain correlation frequency estimation algorithm. So a frequency estimation algorithm with a high frequency estimation accuracy based on the summation of the entire cross correlation is proposed, and its theoretical estimation variance is derived. By analyzing the impact of the pilot position on estimation accuracy and estimation range, a scheme of Variable D-spaced Preamble Middle （VDPM） frame structure is proposed which can choose the distance of pilot blocks according to estimation accuracy and estimation range. Theoretical analysis and simulation results show that the frame structure can satisfy the requirements of frequency estimation range and estimation accuracy, and the estimation algorithm can achieve high estimation accuracy with a few pilot symbols, hence it is suit for short burst communication system.

关 键 词：短突发通信 导频符号 载波同步 帧结构 

分 类 号：TN927[电子电信—通信与信息系统]