在传统的场匹配理论的基础上建立起盒型窗的通用传输参数矩阵,并提出了一种新型的混合模式传输方法来扩展盒型窗带宽.在研究结果的基础上,通过理论分析和数值计算得到了能满足Q波段超宽带带状束行波管所需求的新型混合模式传输盒型窗的...在传统的场匹配理论的基础上建立起盒型窗的通用传输参数矩阵,并提出了一种新型的混合模式传输方法来扩展盒型窗带宽.在研究结果的基础上,通过理论分析和数值计算得到了能满足Q波段超宽带带状束行波管所需求的新型混合模式传输盒型窗的初始结构和尺寸、利用三维高频分析软件HFSS优化并得到了最终结构参数.通过仿真验证和热分析,证明了新的混合模式紧凑型盒型窗在34~52 GHz频带内平均功率容量达到10 k W、反射系数小于-18 d B、相对带宽超过40%.冷测实验结果证实了盒型窗在要求带宽内反射系数均小于-18 d B。展开更多
The Internet of things(IoT) as an important application of future communication networks puts a high premium on delay issues. Thus when Io T applications meet heterogeneous networks(HetNets) where macro cells are over...The Internet of things(IoT) as an important application of future communication networks puts a high premium on delay issues. Thus when Io T applications meet heterogeneous networks(HetNets) where macro cells are overlaid with small cells, some traditional problems need rethinking. In this paper, we investigate the delay-addressed association problem in two-tier Het Nets considering different backhaul technologies. Specifically, millimeter wave and fiber links are used to provide high-capacity backhaul for small cells. We first formulate the user association problem to minimize the total delay which depends on the probability of successful transmission, the number of user terminals(UTs), and the number of base stations(BSs). And then two algorithms for active mode and mixed mode are proposed to minimize the network delay. Simulation results show that algorithms based on mutual selection between UTs and BSs have better performance than those based on distance. And algorithms for mixed modes have less delay than those for active mode when the number of BSs is large enough, compared to the number of UTs.展开更多
文摘在传统的场匹配理论的基础上建立起盒型窗的通用传输参数矩阵,并提出了一种新型的混合模式传输方法来扩展盒型窗带宽.在研究结果的基础上,通过理论分析和数值计算得到了能满足Q波段超宽带带状束行波管所需求的新型混合模式传输盒型窗的初始结构和尺寸、利用三维高频分析软件HFSS优化并得到了最终结构参数.通过仿真验证和热分析,证明了新的混合模式紧凑型盒型窗在34~52 GHz频带内平均功率容量达到10 k W、反射系数小于-18 d B、相对带宽超过40%.冷测实验结果证实了盒型窗在要求带宽内反射系数均小于-18 d B。
基金supported by the National Natural Science Foundation of China (NSFC) under Grants 61427801 and 61671251the Natural Science Foundation Program through Jiangsu Province of China under Grant BK20150852+3 种基金the open research fund of National Mobile Communications Research Laboratory, Southeast University under Grant 2017D05China Postdoctoral Science Foundation under Grant 2016M590481Jiangsu Planned Projects for Postdoctoral Research Funds under Grant 1501018Asupported by NSFC under Grants 61531011 and 61625106
文摘The Internet of things(IoT) as an important application of future communication networks puts a high premium on delay issues. Thus when Io T applications meet heterogeneous networks(HetNets) where macro cells are overlaid with small cells, some traditional problems need rethinking. In this paper, we investigate the delay-addressed association problem in two-tier Het Nets considering different backhaul technologies. Specifically, millimeter wave and fiber links are used to provide high-capacity backhaul for small cells. We first formulate the user association problem to minimize the total delay which depends on the probability of successful transmission, the number of user terminals(UTs), and the number of base stations(BSs). And then two algorithms for active mode and mixed mode are proposed to minimize the network delay. Simulation results show that algorithms based on mutual selection between UTs and BSs have better performance than those based on distance. And algorithms for mixed modes have less delay than those for active mode when the number of BSs is large enough, compared to the number of UTs.
