A high-speed and economical optical local access network system is proposed where bi-directional polarization multiplexing is applied to a bi-directional transmission. Experimental results using a prototype system con...A high-speed and economical optical local access network system is proposed where bi-directional polarization multiplexing is applied to a bi-directional transmission. Experimental results using a prototype system confirm low optical loss and environmental stabilities.展开更多
为解决高密度无线局域网中接入拥塞、资源失衡及流量混传导致的性能瓶颈问题,从接入层面、资源层面及流量层面分析无线局域网接入拥塞问题,并从3个层面提出基于软件定义网络(Software Defined Network,SDN)流量调度的应对策略。实践案...为解决高密度无线局域网中接入拥塞、资源失衡及流量混传导致的性能瓶颈问题,从接入层面、资源层面及流量层面分析无线局域网接入拥塞问题,并从3个层面提出基于软件定义网络(Software Defined Network,SDN)流量调度的应对策略。实践案例验证了该策略在提升网络吞吐量、降低传输时延方面具有明显成效。展开更多
The planning of wireless communication networks in underdeveloped countries is studied for landline telephone, fixed broadband wireless access and PLMN systems via investigation and discussion of the LDC networks＇ ch...The planning of wireless communication networks in underdeveloped countries is studied for landline telephone, fixed broadband wireless access and PLMN systems via investigation and discussion of the LDC networks＇ characteristic, technology selection, deployment consideration, network configuring, civil work evaluation and investment estimation. An example is embedded all through providing a general展开更多
The multiple access fashion is a new resolution for the star-type local area network (LAN) access control and star-type optical fibre LAN. Arguments about this network are discussed, and the results are introduced.
基于医院多业务接入复杂性与内外网协同需求,研究无线局域网(Wireless Local Area Network,WLAN)系统的拓扑架构、接入控制、调度机制及资源优化方法。阐述面向角色的动态接入控制策略,介绍覆盖建模与容量规划方法,并在仿真平台上构建...基于医院多业务接入复杂性与内外网协同需求,研究无线局域网(Wireless Local Area Network,WLAN)系统的拓扑架构、接入控制、调度机制及资源优化方法。阐述面向角色的动态接入控制策略,介绍覆盖建模与容量规划方法,并在仿真平台上构建典型场景,开展协同机制与传统机制的性能对比分析。分析结果表明,所提方案在吞吐量、时延控制、信道利用效率方面具有显著优势,具备良好的工程适用性与系统可扩展性。展开更多
随着医院信息化建设的推进,无线局域网已成为支撑医疗业务的重要基础设施。医院环境中高密度终端对实时数据传输和网络安全的高要求,给无线局域网的设计与部署带来了挑战。针对这些需求,分析无线局域网在医院场景中的技术设计,涵盖无线...随着医院信息化建设的推进,无线局域网已成为支撑医疗业务的重要基础设施。医院环境中高密度终端对实时数据传输和网络安全的高要求,给无线局域网的设计与部署带来了挑战。针对这些需求,分析无线局域网在医院场景中的技术设计,涵盖无线网络性能需求、高密度用户场景下的多无线接入点(Access Point,AP)协同组网、医疗数据传输的服务质量(Quality of Service,QoS)保障机制等内容。通过案例分析,提出适应医院环境的设计方案,确保医疗业务的稳定性与实时性,为医院无线网络的优化与设计提供理论支持与实践指导。展开更多
为了增强煤矿井下安全生产、抢险救灾的能力和提高管理效率,基于数字矿山综合无线局域网络系统设计了煤矿井下无线导航系统。通过利用井下接入点设备(Access Point,AP)的基本服务集识别码和导航设备接收到的信号强度指示进行导航系统内...为了增强煤矿井下安全生产、抢险救灾的能力和提高管理效率,基于数字矿山综合无线局域网络系统设计了煤矿井下无线导航系统。通过利用井下接入点设备(Access Point,AP)的基本服务集识别码和导航设备接收到的信号强度指示进行导航系统内人员与设备的定位。利用嵌入式地理信息系统eSuperMap开发平台和WinCE嵌入式操作系统,在定位的基础上实现对煤矿井下作业人员和流动设备的导航。开发了电子地图操作、信息查询、路径分析、导航等功能,并在Pocket PC 2003模拟器上进行了模拟演示,表明了该系统的可行性。这些工作为煤矿井下无线导航系统的进一步开发打下了重要技术基础。展开更多
This paper presents an overview of a new very high throughput millimeterwave WLAN system operating at 45 GHz band. We begin by reviewing standards process of IEEE 802.11aj(45GHz). Then the frequency spectrum allocatio...This paper presents an overview of a new very high throughput millimeterwave WLAN system operating at 45 GHz band. We begin by reviewing standards process of IEEE 802.11aj(45GHz). Then the frequency spectrum allocation at 45 GHz band is introduced. Next, the channel measurement and mod-eling is given. Specifically, the millimeter-wave MIMO for physical layer enhancement is given in detail.展开更多
基金This research is supported by a grant from FUTABA DENSHI foundation.
文摘A high-speed and economical optical local access network system is proposed where bi-directional polarization multiplexing is applied to a bi-directional transmission. Experimental results using a prototype system confirm low optical loss and environmental stabilities.
文摘为解决高密度无线局域网中接入拥塞、资源失衡及流量混传导致的性能瓶颈问题,从接入层面、资源层面及流量层面分析无线局域网接入拥塞问题,并从3个层面提出基于软件定义网络(Software Defined Network,SDN)流量调度的应对策略。实践案例验证了该策略在提升网络吞吐量、降低传输时延方面具有明显成效。
文摘The planning of wireless communication networks in underdeveloped countries is studied for landline telephone, fixed broadband wireless access and PLMN systems via investigation and discussion of the LDC networks＇ characteristic, technology selection, deployment consideration, network configuring, civil work evaluation and investment estimation. An example is embedded all through providing a general
文摘The multiple access fashion is a new resolution for the star-type local area network (LAN) access control and star-type optical fibre LAN. Arguments about this network are discussed, and the results are introduced.
文摘基于医院多业务接入复杂性与内外网协同需求,研究无线局域网(Wireless Local Area Network,WLAN)系统的拓扑架构、接入控制、调度机制及资源优化方法。阐述面向角色的动态接入控制策略,介绍覆盖建模与容量规划方法,并在仿真平台上构建典型场景,开展协同机制与传统机制的性能对比分析。分析结果表明,所提方案在吞吐量、时延控制、信道利用效率方面具有显著优势,具备良好的工程适用性与系统可扩展性。
文摘随着医院信息化建设的推进,无线局域网已成为支撑医疗业务的重要基础设施。医院环境中高密度终端对实时数据传输和网络安全的高要求,给无线局域网的设计与部署带来了挑战。针对这些需求,分析无线局域网在医院场景中的技术设计,涵盖无线网络性能需求、高密度用户场景下的多无线接入点(Access Point,AP)协同组网、医疗数据传输的服务质量(Quality of Service,QoS)保障机制等内容。通过案例分析,提出适应医院环境的设计方案,确保医疗业务的稳定性与实时性,为医院无线网络的优化与设计提供理论支持与实践指导。
文摘为了增强煤矿井下安全生产、抢险救灾的能力和提高管理效率,基于数字矿山综合无线局域网络系统设计了煤矿井下无线导航系统。通过利用井下接入点设备(Access Point,AP)的基本服务集识别码和导航设备接收到的信号强度指示进行导航系统内人员与设备的定位。利用嵌入式地理信息系统eSuperMap开发平台和WinCE嵌入式操作系统,在定位的基础上实现对煤矿井下作业人员和流动设备的导航。开发了电子地图操作、信息查询、路径分析、导航等功能,并在Pocket PC 2003模拟器上进行了模拟演示,表明了该系统的可行性。这些工作为煤矿井下无线导航系统的进一步开发打下了重要技术基础。
基金supported in part by National Key Basic Research Program of China (973 Program) under Grant No. 2013CB329002National Natural Science Foundation of China under Grant No. 61132003the Natural Science Foundation of Jiangsu Province of China under Grants BK2011019 and BK20130631
文摘This paper presents an overview of a new very high throughput millimeterwave WLAN system operating at 45 GHz band. We begin by reviewing standards process of IEEE 802.11aj(45GHz). Then the frequency spectrum allocation at 45 GHz band is introduced. Next, the channel measurement and mod-eling is given. Specifically, the millimeter-wave MIMO for physical layer enhancement is given in detail.
