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国家自然科学基金(60973111)

作品数:5 被引量:13H指数:3
相关作者:刘元安张洪光周杰吴帆俎云霄更多>>
相关机构:北京邮电大学更多>>
发文基金:国家自然科学基金国家高技术研究发展计划更多>>
相关领域:电子电信自动化与计算机技术机械工程更多>>

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一次混频的共时双带接收机结构
为满足接收机的小型化低功耗的要求,本文提出了一种通过一次混频完成双带信号共时接收的接收机结构。相对于传统的需要两次甚至多次混频的结构,它减小了系统的复杂性和多次混频所带来的噪声影响。本文详细分析了这一结构的两种实现方法,...
贺庆刘元安黎淑兰于翠屏刘鑫吴永乐
关键词:共时混频小型化低功耗
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Resource scheduling in downlink LTE-advanced system with carrier aggregation被引量:3
2012年
In this paper, we focus on the resource scheduling in the downlink of long term evolution advanced (LTE-A) assuming equal power allocation among subcarriers. Considering the backward compatibility, the LTE-A system serves LTE-A and long term evolution (LTE) users together with carrier aggregation (CA) technology. When CA is applied, a well-designed resource scheduling scheme is essential to the LTE-A system. Joint scheduling (JS) and independent scheduling (INS) are two resource scheduling schemes. JS is optimal in performance but with high complexity. Whereas INS is applied, the LTE users will acquire few resources because they can not support CA technology. And the system fairness is disappointing. In order to improve the system fairness without bringing high complexity to the system, an improved proportional fair (PF) scheduling algorithm base on INS is proposed. In this algorithm, we design a weigh factor which is related with the number of the carriers and the percentage of LTE users. Simulation result shows that the proposed algorithm can effectively enhance the throughput of LTE users and improve the system fairness.
LIN Le-xiangLIU Yuan-anLIU FangXIE GangLIU Kai-mingGE Xin-yang
基于混沌并行遗传算法的多目标无线传感器网络跨层资源分配被引量:6
2011年
提出了一种基于混沌并行遗传算法的多目标无线传感器网络跨层资源分配方法,该方法运用混沌序列和并行遗传算法来动态调整传感器网络节点的探测目标及通信时隙等参数,对资源分配方式进行跨层整体优化.在多目标无线传感器网络环境下,将本文方法与传统的随机分配方法、动态规划方法、T-MAC协议及S-MAC协议等资源分配算法进行了仿真比较.仿真结果表明,本文提出的混沌并行遗传算法具有通信时延小,目标检测成功率高等优点,在降低了无线传感器网络功率消耗的同时提高了对目标检测的实时性.
周杰刘元安吴帆张洪光俎云霄
关键词:无线传感器网络无线资源管理HENON映射并行遗传算法
AAA authentication for network mobility
2012年
Network mobility (NEMO) is a protocol proposed for the mobility management of a whole network. It offers seamless Internet connectivity to the mobile end users. However, the NEMO protocol has not been widely used in Internet, because it has not considered the secure problem about authentication and authorization. The proposed framework designed an access control scheme especially used for the NEMO network environment. It is based on the authentication, authorization, and accounting (AAA) system. It can make use of the mobile router to authenticate for all the mobile nodes at the same time, and uses the mobile network node (MNN)-list synchronization mechanism to control the secure access of the MNN. By using the foreign AAA server cache mechanism, this scheme can decrease the authentication time delay and improve the efficiency of the network. The advantages are proved by the comparison with other recent related studies via the OPNETsimulations.
ZHANG JieLIU Yuan-anMA Xiao-leiJIA Jin-tao
关键词:NEMOAAAAUTHENTICATION
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