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The accuracy of the positioning system in indoor environment is often affected by none-line-of-sight ( NLOS) propagation. In order to improve the positioning accuracy in indoor NLOS environment, a method used ultra-wide-band ( UWB ) technology, which based on time of arrival ( TOA) principle, combining Markov chain and fingerprint matching was proposed. First, the TOA algorithm is used to locate the target tag. Then the Markov chain is used to identify if blocking happened and revise the position result. And the fingerprint matching is used to further improve the position accuracy. Finally, an experiment system was built to test the accuracy of the proposed method and the traditional Kalman filter method. The experimental results show that, compared with the traditional Kalman filter method, the proposed method can improve the positioning accuracy in indoor NLOS environment. 相似文献
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Software-Defined Network(SDN)empowers the evolution of Internet with the OpenFlow,Network Virtualization and Service Slicing strategies.With the fast increasing requirements of Mobile Internet services,the Internet and Mobile Networks go to the convergence.Mobile Networks can also get benefits from the SDN evolution to fulfill the Sth Generation(5G) capacity booming.The article implements SDN into Frameless Network Architecture(FNA) for5G Mobile Network evolution with proposed Mobile-oriented OpenFlow Protocol(MOFP).The Control Plane/User Plane(CP/UP)separation and adaptation strategy is proposed to support the User-Centric scenario in FNA.The traditional Base Station is separated with Central Processing Entity(CPE) and Antenna Element(AE) to perform the OpenFlow and Network Virtualization.The AEs are released as new resources for serving users.The mobile-oriented Service Slicing with different Quality of Service(QoS) classification is proposed and Resource Pooling based Virtualized Radio Resource Management(VRRM) is optimized for the Service Slicing strategy with resource-limited feature in Mobile Networks.The capacity gains are provided to show the merits of SDN based FNA.And the MiniNet based Trial Network with Service Slicing is implemented with experimental results. 相似文献
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面向绿色无线通信的基站体系结构 总被引:2,自引:1,他引:1
无线网络的耗能主要来自于基站系统。对无线通信系统中的基站系统结构进行有效地规划和部署,能达到降低能源消耗、实现绿色通信的目的。软件无线电技术的发展为无线基站的绿色演进提供了途径。基于软件无线电技术,文章提出一种可以有效提高通信系统能效、更为绿色环保的基站体系结构,能够更好地实现无线通信系统的绿色演进。 相似文献
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