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1.
Wireless Personal Communications - In this paper a new propagation model is proposed for use in complex indoor environments. The model was tested in the frequency range of 2.4 GHz in the...  相似文献   

2.
Wireless Personal Communications - Mobile ad-hoc networks is an area in communication networks which is mostly known as MANETs. This type of network is made up of nodes which are independent and...  相似文献   

3.
Wireless sensor networks consist of low cost sensor nodes which have limited power supplies, memory capacity, processing capability and transmission rate. Sensor nodes gather information from the environment and send the collected information to base station with help of a routing cooperation. Because of limited resources in Wireless Sensor Networks, fulfilling these routing operations is a major problem. Routing protocols are used to perform these operations. The most important thing by considering while these protocols are designed is energy efficiency. Because wireless sensor networks are widely used in intelligent systems, the energy efficiency of these networks is very important in IoT. Researchers have proposed several hierarchical routing protocols such as LEACH, PEGASIS, TEEN and APTEEN. In this study, an energy efficient routing protocol is developed which is more efficient than currently avaliable routing protocols. The developed protocol involves mapping of the network, sleep–wake/load balancing, data merge processes. The proposed protocol gives better results than other protocols in number of surviving nodes and amount of energy consumed criterias.  相似文献   

4.
对于复杂的室外环境,无线传感器网络如何建立可靠的路由,并尽可能延长全网寿命是一个关键问题.在分析总结现有无线Ad Hoe网络路由协议的优缺点的基础上,提出了一种基于能量与链路稳定性感知的多度量的按需路由协议ELSA-AODV.ELSA-AODV协议是AODV协议的增强与扩展,在保证路由可靠性与稳定性的同时,平衡全网的通信负荷与能量,大大延长了全网的工作寿命.通过仿真实验,验证了ELSA-AODV的有效性.  相似文献   

5.
一种能量感知的Ad Hoc网络路由协议   总被引:1,自引:0,他引:1  
Ad Hoc网络中的节点是由电池供电,整个网络是一个能量受限系统,如何节省节点的能量,尽可能延长网络的可操控时间逐渐成为衡量路由协议性能的重要指标.基于移动节点能量的不同级别,采取不同的转发策略,提出了一种基于能量感知的Ad Hoc网络路由协议--EARP.并与AODV协议进行了性能比较,仿真结果显示,EARP具有较低的能耗,较长的网络存活时间.  相似文献   

6.
Wireless Personal Communications - Mobile Adhoc Networks (MANETS) are gaining popularity because of interconnected networks. Routing is a key issue which needs to be addressed for efficient...  相似文献   

7.
通过对AODV路由协议进行改进,提出了基于AODV的能量有效的路由协议(EE—AODV)。新协议考虑了节点的剩余能量,根据节点的剩余能量调节RREQ延迟来平衡节点的能量消耗,利用节点最近一次传递过数据分组的时间作为约束条件来优化RREQ的洪泛广播,降低网络的能量消耗。仿真结果表明.和AODV路由协议相比,新协议降低了网络的能量消耗并减少了耗尽能量的节点数,延长了网络的生存时间。  相似文献   

8.

In this work, the design of continuous time Fractional Order All-Pass Filter (FOAPF) is proposed. Two different design methods to realize the All-Pass Filter in the fractional domain with mathematical formulations and circuit results are investigated. The first design method is based on Fractional Order Elements (FOEs) where, FOEs of order α and β are utilized to develop a second order All-Pass Filter to the fractional domain. Whereas, in second design method, the fractional filter is approximated into higher order integer filters. The frequency response of the proposed design are validated using MATLAB (2018a) and conjointly with PSPICE (OrCAD 17.2). For first circuit design, FOEs are obtained using a single R–C parallel network. However, for the second circuit design Signal Flow Graph (SFG) approach is utilized. The evaluation of the realized FOAPF is also performed through the Lissajous pattern, AC analysis and Transient Analysis. After the simulations, the achieved results show that the second order FOAPF provides almost 180° phase shift for different values of α, β.

  相似文献   

9.
Wireless Personal Communications - Wireless Sensor Network (WSN) based Communication has been devised for exchanging data with low cost, minimal maintenance, and for more convenience. These...  相似文献   

10.
提出了一种基于AODV的节能路由算法EBF-AODV.该算法在路由发现过程中,源节点设置一个阈值,中间节点根据本节点拓扑变化情况决定如何处理路由请求分组,目的节点综合考虑路径上的可用能量和路由跳数,选择最佳路径.通过仿真证明了该算法的有效性.  相似文献   

11.
针对无线体域网中因通信链路时变而带来的能量浪费问题,该文提出一种能量高效且可靠的自适应路由协议.该协议在数据传播模型的基础上引入了无线链路质量的计算方法,并将各个链路质量作为隐马尔可夫模型(HMM)的状态观测值进行训练,以此得出最优的路由路径.仿真结果表明,该协议相比于基于预测的安全可靠路由(PSR)协议等已有的预测路由协议,降低了网络的数据丢包率和时延,延长了网络节点的生命周期.  相似文献   

12.
针对同构无线传感器网络的能源瓶颈问题提出一种能源有效的自适应路由协议,该协议在分布式动态分簇的基础上提出一种班车算法对数据进行逐层汇聚,以减少网络中流动数据包的数量,同时分担簇头节点的计算量。Tossim仿真试验表明该协议能够显著地减少节点的能量开销,提高网络的适应性,有效地延长网络的生命周期。  相似文献   

13.
田进华  杨志强 《电视技术》2015,39(9):100-103
针对现有的网络编码路由技术中存在的组合优化性能较差,如计算开销较大、数据交互复杂以及路由构建周期较长等问题,以遗传算法为理论基础,提出了一种改进的网络编码感知路由算法.该算法利用遗传算法的高效组合优化功能,重新构造了其网络编码感知路由的染色体表达、适应度函数以及遗传操作等,并添加了一种修复模块.实验结果表明,该算法与同类型的网络编码路由算法相比,其平均路由构造时间较短、网络吞吐量大,展现出较强的组合优化性能,并具有强优化的寻址能力.  相似文献   

14.
Wireless Personal Communications - Ambient assisted living (AAL) is focused on providing assistance to patients primarily in their natural environment to improve their quality of life. AAL domain...  相似文献   

15.
Wireless Personal Communications - Energy efficiency to route data in wireless sensor networks is key concern to enhance network lifetime. In this paper, an energy efficient routing protocol has...  相似文献   

16.
基于AODV的自组网QoS路由协议   总被引:3,自引:0,他引:3  
该文在AODV协议的基础上,设计了保证实时业务服务质量的路由协议Q-AODV。该协议针对无线环境的共享媒体特性,定义了节点的共享频率集,以节点周围的剩余可预约带宽作为路由度量的主要参数,回避可能发生拥塞的链路,同时提高了网络的整体效率。仿真结果表明:该算法保证了实时业务的服务质量,在数据包的传输时延和网络的分组递交率方面优于原有协议。  相似文献   

17.
一种Ad hoc网络中的主动式QoS路由设计   总被引:1,自引:0,他引:1  
随着移动技术的发展,QoS已经成为Adhoc网络中的研究热点。在最短路径算法的基础上,对在TDMA机制下的自组织网络主动式QoS路由进行改进,将带宽和误码率作为约束条件,把实际自组织网络中各个节点占用时隙的先后而影响传输时延作为路由判决的主要依据,较好地避开了干扰和拥塞,从而获得了较高的系统吞吐量,并进行了模拟仿真,验证了协议的有效性。  相似文献   

18.
动态QoS多播路由协议   总被引:24,自引:0,他引:24       下载免费PDF全文
李腊元  李春林 《电子学报》2003,31(9):1345-1350
本文主要研讨了具有QoS约束的动态多播路由问题.文中描述了一种适用于QoS多播路由的网络模型,提出了一种动态QoS多播路由协议(DQMRP),该协议能操作在单播路由协议的顶层,它只要求网络链路(或节点)的局部状态信息,不需要维护全局状态信息.DQMRP可有效地减少构造一棵多播树的开销,多播组成员可动态地加入/退出多播会晤.该协议可搜索多条可行树枝,并能选择一条最优(或近优)树枝将新成员连接到多播树.文中给出了DQMRP的正确性证明和复杂性分析,并通过仿真实验验证了该协议的可用性和有效性.  相似文献   

19.
为了延长Ad Hoc网络的生存周期,提出了一种基于蚁群优化和能量有效的Ad Hoc网络多路径动态路由算法ACOERA。该算法根据路径的有效能量率进行路由选择,路径建立后通过蚁群优化算法动态收集路径信息,并对路由表进行更新。仿真结果表明,该算法能有效延长网络生存时间,增强通信网络的自适应能力。  相似文献   

20.
Wireless Personal Communications - In Wireless Sensor Network (WSN), the lifetime optimization based on minimal energy consumption and security are the crucial issues for the effective design of...  相似文献   

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