泛在协同环境下最大似然估计时间同步算法.pdf

第37卷第10期
仪器仪表学报
Vol 37 No 10
2016年10月
Chinese Journal of Scientific Instrument
Oct.2016
泛在协同环境下最大似然估计时间同步算法
张晖,赵鹏
(南京邯电大学江苏省无线通信重点实验室南京2100030
摘要:泛在接人环境下,多个終端相工协同,共同为用户提供个性化的业务保障,而时间同步系多终端协同的关键技术之
终端阆时间同歩与否直接決定了基于多終端协同的各类应用的性能优劣。本文提出了一种基于最大似然估计的新型时间同步
算法,通过结合多终端协同场景特点,建立単网络最大似然估计模型,并提出多网络同步参数触合模型,以实现一般情况下目标
终端之间的精准同步:进一步地,分析了时样本子集正交利共有邻居节点稀疏等情况,提出相应的解决办法,以实现特殊情况
下日标终端之问的精准同步。仿真结果验证了该算法的有效性,实测数据亦证明了该算法的实用性。
关键词:泛在接入坏境;多終端协同场景;时问同步;最大似然估计
中图分类号:TN915TH124
文献标识码:A国家标准学科分类代码:510.5035
Time synchronization algorithm based on maximum likelihood
estimation in ubiquitous cooperative environment
ao上eng
(Jiangsu Key Laboratory of Wireless Communications, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
Abstract: In ubiquitous acess environment, multiple terminals cooperate with each other to provide personalized services for users
Obviously, as the key technology of multi-terminal cooperation, time synchronization determines whether the corresponding services
perform better or not. In this paper, a novel time synchronization algorithm based on maximum likelihood estimation is proposed
According to the characteristics of multi-terminal cooperation scenario, a maximum likelihood estimation model for single network and a
fusion model of synchronization parameters for multi-networks are established respectively, so as to achieve the aceurate time
synchronization among target terminals in general case. Furthermore, two special cases(i, e. time sample subsets are orthogonal and
mutual neighbor nodes are sparse )are analyzed, and then the corresponding solving methods are proposed so as to achieve the accurate
time synchronization among target terminals in special case. Simulation results verify the effectiveness of the proposed algorithm, and
actual measured data also verify its practicality
Keywords: ubiquitous access environment; multi-terminal cooperation scenario; time synchronization maximum likelihood estimation
多样化,泛在网络通过使川多种接入技术,不仅可以提高
网络速率,还可以扩大网络的複盖范围。与此同时,越来
越多的终端设备将出现在用广周边,并且这些终端都具
随着芯片制造、无线宽带、射频识别、信息感及网有较强的网络接入能力,能够接入不同的网络,面单个的
络业务等信息通信技术的不断发展,信息网络将公更加终端的能力毕竞有限,通过多个终端的相互协同作,使
全面深入地融合人与人、人与物乃至物与物之间的现实终端侧泛在的设备能够通过网络化的协同而得到功能
物理空间与抽象信息空间,并不断向泛在网络方向演性能方而的扩展,从而为川户提供高质量的服务,使川户
进2。无线通信也越来越普及,相关接入网技术越来越获得最佧体验
收稿∏期:2016-04 Received Date:201604
基金项山:?家H然科学基企(61471203)、江が省“肖蓝工程”(2016)、南京邮电人学1311人オ计划(2015)、江苏省计算机信息处理技术重
点实验室放课:1518)项山资助