随着光纤传输介质的出现,通信领域也进入了新的技术革新与发展黄金期。尤其在同步数字传输(Synchronous Digital Hierarchy,SDH)与波分复用(Wavelength Division Multiplexing,WDM)光纤技术日渐成熟的背景下,光纤技术逐步取代了过去的...随着光纤传输介质的出现,通信领域也进入了新的技术革新与发展黄金期。尤其在同步数字传输(Synchronous Digital Hierarchy,SDH)与波分复用(Wavelength Division Multiplexing,WDM)光纤技术日渐成熟的背景下,光纤技术逐步取代了过去的载波传输技术,促使社会各领域的通信方式与通信质量发生了转变。因此,着重围绕SDH与WDM光纤技术的应用优势及实际应用效果进行全面阐述。展开更多
Radio frequency identification(RFID) is a new type of non-contact automatic identification technology.Due to its low energy consumption,low cost,and its adaptability to harsh environments,it has been applied to many f...Radio frequency identification(RFID) is a new type of non-contact automatic identification technology.Due to its low energy consumption,low cost,and its adaptability to harsh environments,it has been applied to many fields.In the RFID systems,data collision is inevitable when the reader sends a communication request and multiple tags respond with simultaneous data transmission.Data collision is prone to causing problems such as:identification delay,spectrum resource waste,a decreased system throughput rate,etc.Therefore,an efficient,stable anti-collision protocol is crucial for RFID systems.This research analysed the current research into RFID anticollision protocols and summarised means for its improvement through the mechanism of implementation of different types anticollision protocols.Finally,a new direction is proposed for the future development of RFID anti-collision protocol systems.展开更多
文摘随着光纤传输介质的出现,通信领域也进入了新的技术革新与发展黄金期。尤其在同步数字传输(Synchronous Digital Hierarchy,SDH)与波分复用(Wavelength Division Multiplexing,WDM)光纤技术日渐成熟的背景下,光纤技术逐步取代了过去的载波传输技术,促使社会各领域的通信方式与通信质量发生了转变。因此,着重围绕SDH与WDM光纤技术的应用优势及实际应用效果进行全面阐述。
基金The authors would like to thank the reviewers for their detailed reviews and constructive comments, which have helped improve the quality of this paper. This paper is supported by the National Natural Science Founda- tion of China （No. 61371092）, the Doctoral Fund of Ministry of Education of China （No.20130061120062）, and the China Postdoc- toral Science Foundation （No. 2014M551184）.
文摘Radio frequency identification(RFID) is a new type of non-contact automatic identification technology.Due to its low energy consumption,low cost,and its adaptability to harsh environments,it has been applied to many fields.In the RFID systems,data collision is inevitable when the reader sends a communication request and multiple tags respond with simultaneous data transmission.Data collision is prone to causing problems such as:identification delay,spectrum resource waste,a decreased system throughput rate,etc.Therefore,an efficient,stable anti-collision protocol is crucial for RFID systems.This research analysed the current research into RFID anticollision protocols and summarised means for its improvement through the mechanism of implementation of different types anticollision protocols.Finally,a new direction is proposed for the future development of RFID anti-collision protocol systems.
文摘可充电无线传感网(rechargeable wireless sensor network, RWSN)凭借其易部署、可扩展、自组网等特点,可全方位控制微电网源网荷储信息采集的深度和广度,提升微电网智能调度水平。孤岛微电网复杂的工作环境增加了传统人工运维以及移动充电装置补能的难度,因地制宜选取高密度光伏能量源构建面向孤岛微电网智能监测的分布式光伏供能无线传感网络(solar-powered wireless sensor network, SPWSN)能量自维持框架,研究光伏捕能簇头协同无线信息能量同步传输(simultaneous wireless information and power transfer, SWIPT)技术的能量调度策略,可以在全双工模式下为簇成员节点供能以满足网络监测需求。为实现网络能效最大化,提出了光伏捕能协同SWIPT能量调度优化算法,基于多层迭代解耦优化方法将强耦合非凸分数规划问题分解为光伏捕能簇头部署、簇头能量广播及时间分配、节点采样控制三个子问题进行优化求解。仿真结果表明,所提算法较现有算法在提高网络能效和光伏供能网络稳定性上有较大提升,满足信息采集系统的全时段监测需求,为孤岛微电网能量管理提供了一个绿色、高效、可持续的无人化信息采集系统。
