首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 298 毫秒
1.
为了提高工作效率和维护水平,迅速、有效、合理地调配资源,提高全网设备的利用率和系统指标,中国移动广东公司珠海分公司开发出的掌上通移动通信维护系统,利用智能手机技术及移动通信技术将移动终端、移动网络、移动应用有机结合并成功运用到日常移动网络维护中,提升移动网络信号质量拨测、基站现场巡检数据管理、基站站点信息管理及基站资产盘点与调拨管理等移动通信网络日常维护的效率和质量。  相似文献   

2.
主要阐述了在中越边境区域对GSM信号的常规监测方法,并研究了利用爱立信测试手机以及诺基亚测试手机对GSM信号深入监测的方法,以掌握越南和我国边境互相覆盖的GSM信号,获取越南运营商信号的使用频率,越方基站的基站识别色码(BSIC),全球小区识别码(CGI)、越方移动基站距离我国边界的大概距离等信息.  相似文献   

3.
文章设计了一种基于先进微处理器(ARM)、数字信号处理器(DSP)和现场可编程门阵列(FPGA)体系结构的3G移动终端基带信号处理器。该处理器能灵活实现移动通信系统中基带信号的各种处理,通过无线信号实现移动终端同基站之间的发送与接收,而且能够于不同基站之间进行信号切换。该系统的硬件设计包括以ARM主控模块、DSP实时数据处理模块和FPGA信号生成模块,移动终端软件包括应用层软件、通信协议软件和物理层软件,很好地满足了标准兼容和客户对于功能改善和低成本的需求。  相似文献   

4.
针对车辆在运行过程中可能出现异常情况,设计了一种将车体振动加速度作为车辆运行状态信号的混合式实时监测系统。通过部署在车体内的传感器节点组成一个实时无线监测网络,采用虚拟化编程软件LABVIEW,对采集的信号进行实时分析和显示,并通过模拟实验对该监测网络予以测试验证。实验结果表明:该无线实时监测网络,具有较高的测试精度和稳定性,能有效的对车辆运行状态进行检测。  相似文献   

5.
基于中继技术的LTE-A终端省电方案   总被引:1,自引:1,他引:0  
吴德操  李方伟  来江 《电视技术》2011,35(11):58-60
利用LTE-A协议对中继技术的支持,提出将中继协议集成到移动终端内部,在充电状态下切换为中继节点,为附近其他移动终端提供信号中继服务,从而达到省电的目的。当附近多个移动终端切换为中继节点时,使用V-MIMO技术与基站连接以帮助其他移动终端提高信号质量和速率。  相似文献   

6.
近年来,由于物联网技术的飞速发展,使得变电站电气设备在线监测技术有了新的研究方向。本设计将变电站电气设备测温点放入传感网络,然后以无线传输方式把数据传送给基站,再经由基站传给中心,在终端可通过温度管理软件实现实时温度监测功能和联动报警功能等。管理中心监测人员可以根据电气设备运行的温度、相对温升等实时信息判断电气设备工作状态是否稳定。这种基于物联网的实时测温系统的应用,减少了工作人员的劳动强度,减少了故障排除的时间,给变电站电气设备的实时监控带来了经济意义。  相似文献   

7.
UAV(unmaned aerial vehicle无人机)因其移动性、灵活性和高度适应性等便捷优势,在各行业应用中得到迅速发展,与此相应的给无线网络系统也带来系列关键的潜在应用。一方面,无人机可以作为空中基站,以提高无线网络的覆盖范围、容量、可靠性和能源效率。另一方面,无人机可以作为移动终端在蜂窝网络内规模组网,将现有的实时视频流业务扩展到其他应用服务连接。对基于无人机的无线通信网络应用场景进行了研究探讨。  相似文献   

8.
《通讯世界》2001,(5):11
关键之一:同步 同步是OFDM系统中的关键问题.在下行链路中,基站同步地向各个移动终端发送信号,这与广播的情形是一样的.所有来自于基站的数据可以被移动终端的同步利用.在上行链路中,来自不同移动终端的信号必须以一定的同步性到达基站,才能保证子载波间的正交性.这里,只有分配给某一移动终端的子载波携带的信息才可以用于估计该移动终端的时域和频域偏移.这些偏移是由基站生成的,再由基站发回移动终端,以便进行同步.同步又分为时域同步和频域同步.  相似文献   

9.
在蜂窝无线网络中,单基站定位是最简单易行的定位方法,其需要利用基站测量移动终端信号的到达时间(TOA,time of arrival)和到达角(AOA,Angle of Arrival)信息.但是非视距(NLOS,Non Line of Sight)误差是影响定位精度的主要原因,为了抑制NLOS对定位精度的影响,提出了一种利用移动终端和中继节点之间的协作信息来提高定位精度的算法.该算法通过处理基站测量的TOA/AOA信息,以及移动终端到中继节点的TOA信息,利用中继节点与MS间的协作信息对估计的位置进行修正.仿真分析结果表明,在单基站蜂窝网中,提出的算法不仅整体提高了系统定位性能,而且在MS距离基站比较远的情况下,提出的协作定位算法的定位精度比现有的算法有明显提高.  相似文献   

10.
文章介绍了一种基于ARM、DSP和FPGA体系结构的3G-TD移动终端基带信号处理器。该系统能灵活实现移动通信系统中基带信号的各种处理,通过无线信号实现移动终端同基站之间的发送与接收,而且能够与不同基站之间信号进行切换。同时也给出了该系统的硬件设计、软件设计及其应用。并且满足标准兼容和客户对于功能改善、成本和电池寿命的需求。  相似文献   

11.
研究了一种全新的生命体征监测系统,为野外活动人员提供快速的救援保障。系统整合四旋翼无人机、摄像头、无线基站、测控站、监控终端和生命体征检测设备,在四旋翼无人机上安装无线基站,实现无线监测所有队员的生命体征信息和现场情况。基站安装在无人机上,不受地形的影响,解决了传统地面安装基站的局限性,并提高了无线信号的覆盖范围。  相似文献   

12.
本监测系统利用无线射频与GPRS网络相结合的方式,监测终端将温度传感器与烟雾浓度传感器采集到的数据通过无线射频发送到基站,再通过基站的GPRS网络将数据发送到监控中心,来实现对林火的实时监测。通过监控中心对整个网络的控制,可以实时监测森林的状况。本监测系统结合无线射频和GPRS网络的优势,无线射频使监测终端更加方便安装,GPRS网络可以实现远程监控管理。本监测系统可以通过短信、服务器、定时和报警触发方式启动,可以实时采集现场数据。本设计的硬件电路以LPC767芯片为核心,采用RF200无线射频芯片和MC55模块进行了各种外围电路设计,采取了低功耗与抗干扰措施。制作出了电路板,并且完成了部分功能的测试。  相似文献   

13.
Hoh Xil is the national nature reserve in China, and Tibetan antelope is a research hotspot of wildlife protection in this area. In order to track the population and activity of Tibetan antelope in Hoh Xil, a quantum wireless sensor monitoring network(QWSMN) based on the quantum satellite wide-area communication networks was proposed. This network consists of quantum wireless sensors installed on the Tibetan antelope, small quantum base stations, quantum satellite signal transmitting stations, quantum satellite and quantum satellite signal receiving stations. The simulation results show that under the interference of the sandstorm, a quantum satellite signal transmitting station can cover the monitoring area of 20 106 km2, and the network throughput reaches 40 KB/ s. This network can realize large-scale monitoring of Tibetan antelope in Hoh Xil and provide theoretical basis for the construction of global wildlife monitoring network.  相似文献   

14.
陈勇  高尚  曹玉保 《电子设计工程》2012,20(18):107-109
为了实现对矿井温、湿度检测,提出了一种基于物联网的矿井温、湿度检测系统,并完成了系统的软硬件测试。硬件包括由分布在矿井中的测量节点组成的无线传感网络,由基站节点和监控终端设备相连接形成的监控装置,软件采用MSP430进行编程,并实现了温湿度信号检测。实际应用表明,该系统具有体积小,部署方便,成本低廉等优点。  相似文献   

15.
In heterogeneous wireless access networks, each mobile terminal may frequently need to change its base station (BS); this change is called a ‘handoff’. BSs have static parameters, which are related to their radio access technologies (RATs); however, they also contain dynamic parameters such as load and signal quality. Therefore, the problem of handoff decision includes two subproblems of RAT selection and BS selection. In this paper, first a ‘heterogeneous handoff management system’ for gathering all different required parameters is proposed. Second, a RAT Selection algorithm based on analytic hierarchy process and a BS Selection algorithm based on data envelopment analysis are designed. Finally, by means of ‘weight restriction’ technique, we develop a method for studying the impact of RAT Selection parameters on the performance of the network. Simulation results indicate that RAT Selection parameters have significant impact on the bandwidth utilization, energy consumption and the whole satisfaction of the users in heterogeneous wireless access networks.Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

16.
Sensor networks are deployed in numerous military and civil applications, such as remote target detection, weather monitoring, weather forecast, natural resource exploration and disaster management. Despite having many potential applications, wireless sensor networks still face a number of challenges due to their particular characteristics that other wireless networks, like cellular networks or mobile ad hoc networks do not have. The most difficult challenge of the design of wireless sensor networks is the limited energy resource of the battery of the sensors. This limited resource restricts the operational time that wireless sensor networks can function in their applications. Routing protocols play a major part in the energy efficiency of wireless sensor networks because data communication dissipates most of the energy resource of the networks. The above discussions imply a new family of protocols called chain-based protocols. In the protocols, all sensor nodes sense and gather data in an energy efficient manner by cooperating with their closest neighbors. The gathering process can be done until an elected node calculates the final data and sends the data to the base station. In our works, we have proposed two methods to optimize the lifetime of chain-based protocols using Integer Linear Programming (ILP) formulations. Also, a method to determine the bounds of the lifetime for any energy-efficient routing protocol is presented. Finally, simulation results verify the work in this chapter. Furthermore, previous researches assume that the base station position is randomly placed without optimization. In our works, a non convex optimization model has been developed for solving the base station location optimization problem.  相似文献   

17.
陈勇  徐钊  张雪 《电子设计工程》2012,20(19):80-81,84
针对矿井实际需求情况,提出了一种基于云计算的无线传感网络火情远程监控系统,此系统包括通讯基站、无线传感器网络和云计算平台,其中,无线传感器网络通过通讯基站与云计算平台相连接。它包括用于采集煤矿安全数据的无线传感器、执行器和用于传输煤矿安全数据的无线网关。该系统具备低成本、自组织、低功耗、信息交互方便的特点,具有很好的应用前景。  相似文献   

18.

Ubiquitous Communication is being a trend in this era. It is possible anywhere anytime with the sustenance and by the agreement of different service providers of Mobile technology. A mobile node which is attached to its base station relinquishes its connection while continuous mobility causes a fluctuation of signal strength. To overcome this issue, heterogeneous networks provision is obligatory. Normally Base stations serve several mobile nodes. Whenever a base station cannot handle a mobile terminal, it will assign its node to nearby available base station for service. The process of assignment of mobile nodes to another base station is termed as Heterogeneous handover. This type of Handover is needed for seamless integration of networks. LTE has proved promising outcomes in providing successful handover, Since it uses eNodeB infrastructure. In this work, Received signal strength is taken as main measure and analysed. Received Power acts as the building block for making possible handover across heterogeneous Radio Access Technologies. Proposed method suggests a vertical handover based on various signal measures. Enhanced Weighted Sum Method is incorporated for Handover decision making. Several criteria also utilized.

  相似文献   

19.
Wireless networks are now very essential part for modern ubiquitous communication systems. The design of efficient routing and scheduling techniques for such networks have gained importance to ensure reliable communication. Most of the currently proposed geographic routing protocols are designed for 2D spatial distribution of user nodes, although in many practical scenarios user nodes may be deployed in 3D space also. In this paper, we propose 3D routing protocols for multihop wireless networks that may be implemented in two different ways depending on how the routing paths are computed. When the routing paths to different user nodes from the base station in the wireless network are computed by the base station, we call it centralized protocol (3DMA‐CS). A distributed routing (3DMA‐DS) protocol is implemented when respective routing path of each user node to the base station is computed by the user node. In both of these protocols, the user (base station) selects the relay node to forward packets in the direction of destination, from the set of its neighbours, which makes minimum angle with the reference line drawn from user (base station) to the base station (user), within its transmission range. The proposed protocols are free from looping problem and can solve the void node problem (VNP) of multihop wireless networks. Performance analysis of the proposed protocol is shown by calculating end‐to‐end throughput, average path length, end‐to‐end delay, and energy consumption of each routing path through extensive simulation under different network densities and transmission ranges.  相似文献   

20.
无线传感器网络中,为了抵御全局流量监测的攻击者,提出了一种基于节点包发送速率动态调整的基站位置隐私保护策略SRA。SRA通过调整全网节点的发包率,实现源节点到基站的流量隐藏,继而能够有效抵御全局流量分析的攻击者。理论表明,SRA能够有抵御全局流量的攻击者对基站的定位。更进一步地,提出了基于贪心选择路径的基站位置隐私保护策略GCR,进一步降低网络通信开销。实验表明,与SRA相比,GCR能够有效保护基站的位置隐私且具有较低的通信开销。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号