In this article, a novel cooperative wireless localization scheme based on information fusion is proposed. The scheme combines large-scale arrival time and small-scale distance measurements obtained from the next-gene...In this article, a novel cooperative wireless localization scheme based on information fusion is proposed. The scheme combines large-scale arrival time and small-scale distance measurements obtained from the next-generation converged networks. The maximum likelihood （ML） estimate of the terminal＇s position is derived with closed-form solution, and the Cramer-Rao lower bound （CRLB） of the estimate error is investigated. Both theoretical analysis and simulation results verify that the proposed localization scheme can significantly enhance the location precision. Moreover, the mean square error of position estimate approximates the CRLB when the number of reference stations increases, which indicates that the proposed ML estimator is asymptotically efficient.展开更多
以太网光纤通道FCoE(Fiber Channel Over Ethernet)实现了数据中心前端计算网络与后端存储网络的无缝融合,降低了数据中心基础设施的单位建设成本、维护成本,支持数据中心异构网络环境与不同的接口类型。存储区域网络SAN(Storage Area N...以太网光纤通道FCoE(Fiber Channel Over Ethernet)实现了数据中心前端计算网络与后端存储网络的无缝融合,降低了数据中心基础设施的单位建设成本、维护成本,支持数据中心异构网络环境与不同的接口类型。存储区域网络SAN(Storage Area Network)中交换机数量受到8比特域ID唯一的限制最多可以有239台。N端口虚拟化技术NPV(N Port Virtualization)极大地克服了SAN网络在规模上受限的问题,能够让更多的服务器或存储设备接入到网络中,扩大网络容量。NPV交换机与传统FCF(Fabric Channel Forward)交换机最大的差别是上下行流量转发机制不同,它采用上行流量从映射端口转发,下行流量查表转发。NPV交换机驱动层路由模块的设计与实现采用敏捷开发模式进行,主要包括端口设置、下发NPV Mapping表项、路由表项、Fips规则下发。实验测试证明该设计实现了NPV交换机对FCoE流量的正常转发,确保了可行性。展开更多
基金supported by the Program for New Century Excellent Talents in University (NCET-05-0116)the Hi-Tech Research and Development Program of China (2006AA01Z283, 2007AA01Z261)+1 种基金the National Natural Science Foundation of China (60702051)the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP-20070013028)
文摘In this article, a novel cooperative wireless localization scheme based on information fusion is proposed. The scheme combines large-scale arrival time and small-scale distance measurements obtained from the next-generation converged networks. The maximum likelihood （ML） estimate of the terminal＇s position is derived with closed-form solution, and the Cramer-Rao lower bound （CRLB） of the estimate error is investigated. Both theoretical analysis and simulation results verify that the proposed localization scheme can significantly enhance the location precision. Moreover, the mean square error of position estimate approximates the CRLB when the number of reference stations increases, which indicates that the proposed ML estimator is asymptotically efficient.
文摘以太网光纤通道FCoE(Fiber Channel Over Ethernet)实现了数据中心前端计算网络与后端存储网络的无缝融合,降低了数据中心基础设施的单位建设成本、维护成本,支持数据中心异构网络环境与不同的接口类型。存储区域网络SAN(Storage Area Network)中交换机数量受到8比特域ID唯一的限制最多可以有239台。N端口虚拟化技术NPV(N Port Virtualization)极大地克服了SAN网络在规模上受限的问题,能够让更多的服务器或存储设备接入到网络中,扩大网络容量。NPV交换机与传统FCF(Fabric Channel Forward)交换机最大的差别是上下行流量转发机制不同,它采用上行流量从映射端口转发,下行流量查表转发。NPV交换机驱动层路由模块的设计与实现采用敏捷开发模式进行,主要包括端口设置、下发NPV Mapping表项、路由表项、Fips规则下发。实验测试证明该设计实现了NPV交换机对FCoE流量的正常转发,确保了可行性。
