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陈彦辉 《无线电技术与信息》2006,(6):87-91
以IEEE802.11标准为基础的无线技术已经成为目前无线局域网(WLAN)技术的主流。通过接入无线网络实现移动办公已经成为很多人生活方式的一部分。为了满足人们对传输速率日益增长的要求,在相继推出了802.11b、802.11a以及802.11g标准以后,IEEE工作组即将提出下一代高速无线局域网标准——802.11n。 相似文献
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介绍了无线局域网技术的发展、特点,并详细介绍了IEEE802.11b无线局域网标准,在此基础上以ActivMedia Robotics公司的P3一DX型移动机器人为对象,构建了一种基于无线局域网的移动机器人远程控制系统应用方案,开发了基于服务器/客户模式的控制平台。 相似文献
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无线局域网的发展速度是有同共睹的,从最早的802.11标准演化出802.11b、802.11a再到最新的802.11g标准,只短短的数年时间,就有如此大的飞跃1802.11g技术相当于802.11b的5倍传输速率。54M的带宽远远不是极限,高吞吐量的无线网络技术早已问世,但由于价格等诸多因 相似文献
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无线局域网标准与应用 总被引:1,自引:0,他引:1
随着无线局域网技术的不断发展,无线局域网的应用与日益广泛。介绍了无线局域网的基本概念和特点,分析了无线局域网的相关标准,并对无线局域网技术的应用前景做了展望。 相似文献
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目前,越来越多的通讯应用希望创建于高传输速率的平台上,即无线局域网所扮演的角色不仅只是替换网线,它将能提供更广泛的通讯应用,包括结合GPRS的双网计划,甚至结合3G网络的B3G异构网络(heterogeneous network).在此概念下,无线局域网不只要提升传输速率,还必须搭配完善的协议.很明显,1999年提出的IEEE 802.11媒介访问控制(Media Access Control,MAC)标准已无法满足未来多样化应用的需求,包括安全性(security)、接入器(Access Point,AP)之间的交互连结以及服务质量(QoS)等协议,因此增强原标准成为无线局域网发展刻不容缓的议题. 相似文献
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熊瑾煜 《电信工程技术与标准化》2004,(3):16-19
无线宽带城域网正在成为无线接入领域新的热点,802.16系列标准的制定和WiMAX的成立推动了相应产品的开发热潮.本文介绍了802.16系列标准与规范的制定过程,比较了802.16和802.11在技术特点和市场定位方面的不同,并分析了无线宽带城域网产品未来的市场发展前景. 相似文献
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无线局域网技术及应用 总被引:9,自引:0,他引:9
无线局域网技术是目前发展迅速的技术,相对于有线局域网有许多优点。随着无线网络产品性能的提高和价格的不断下降,无线局域网技术有着广泛的应用前景。据此对无线局域网的基本概念、特点及其技术作了简单的介绍,提出了无线局域网面向应用的几种解决方案,并对发展前景作了预测。 相似文献
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归纳了无线局域网系统设计流程,以接入访问点放置问题和信道配置问题为重点,归纳了已提出的目标函数和常见的优化算法,同时介绍了新提出的系统吞吐率最大化和公平性均衡目标函数,以及将接入点放置问题和信道配置问题联合解决的补丁算法. 相似文献
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This paper studies scheduling algorithms for an infra-structure based wireless local area network with multiple simultaneous
transmission channels. A reservation-based medium access control protocol is assumed where the base station (BS) allocates
transmission slots to the system mobile stations based on their requests. Each station is assumed to have a tunable transmitter
and tunable receiver. For this network architecture, the scheduling algorithms can be classified into two categories: contiguous
and non-contiguous, depending on whether slots are allocated contiguously to the mobile stations. The main objective of the
scheduling algorithms is to achieve high channel utility while having low time complexity. In this paper, we propose three
scheduling algorithms termed contiguous sorted sequential allocation (CSSA), non-contiguous round robin allocation (NCRRA)
and non-contiguous sorted round robin allocation (NCSRRA). Among these, CSSA schedules each station in contiguous mode, while
other two algorithms, NCRRA and NCSRRA, schedule stations in non-contiguous mode. Through extensive analysis and simulation,
the results demonstrate that the CSSA with only slightly increased complexity can achieve much higher channel utility when
compared to the existing contiguous scheduling algorithms. The NCRRA and NCSRRA on the other hand, results in significantly
lower complexity, while still achieving the optimal channel utility compared to existing non-contiguous scheduling algorithms.
Chonggang Wang received a B.Sc. (honors) degree from Northwestern Polytechnic University, Xi'an, China, in 1996, and M.S. and Ph. D. degrees
in communication and information system from University of Electrical Science and Technology in China, Chengdu, China, and
Beijing University of Posts and Telecommunications, Beijing, China, in 1999 and 2002, respectively. From September 2002 to
November 2003 he has been with the Hong Kong University of Science and Technology, Hong Kong, where he is an associate researcher
in the Department of Computer Science. He is now a post-doctoral research fellow in University of Arkansas, Arkansas. His
current research interests are in wireless networks with QoS guarantee, sensor networks, peer-to-peer and overlay networks.
Bo Li received the B.S. (summa cum laude) and M.S. degrees in the Computer Science from Tsinghua University, Beijing, P. R. China,
in 1987 and 1989, respectively, and the Ph.D. degree in the Electrical and Computer Engineering from University of Massachusetts
at Amherst in 1993. Between 1994 and 1996, he worked on high performance routers and ATM switches in IBM Networking System
Division, Research Triangle Park, North Carolina. Since January 1996, he has been with Computer Science Department, the Hong
Kong University of Science and Technology, where he is an associated professor and co-director for the ATM/IP cooperate research
center, a government sponsored research center. Since 1999, he has also held an adjunct researcher position at the Microsoft
Research Asia (MSRA), Beijing, China. His current research interests include wireless mobile networking supporting multimedia,
video multicast and all optical networks using WDM, in which he has published over 150 technical papers in referred journals
and conference proceedings. He has been an editor or a guest editor for 16 journals, and involved in the organization of about
40 conferences. He was the Co-TPC Chair for IEEE Infocom'2004. He is a member of ACM and a senior member of IEEE.
Krishna M. Sivalingam (ACM ‘93) is an Associate Professor in the Dept. of CSEE at University of Maryland, Baltimore County. Previously, he was
with the School of EECS at Washington State University, Pullman from 1997 until 2002; and with the University of North Carolina
Greensboro from 1994 until 1997. He has also conducted research at Lucent Technologies' Bell Labs in Murray Hill, NJ, and
at AT&T Labs in Whippany, NJ. He received his M.S. and Ph.D. degrees in Computer Science from State University of New York
at Buffalo in 1990 and 1994 respectively; and his B.E. degree in Computer Science and Engineering in 1988 from Anna University,
Chennai (Madras), India. While at SUNY Buffalo, he was a Presidential Fellow from 1988 to 1991. His research interests include
wireless networks, optical wavelength division multiplexed networks, and performance evaluation. He holds three patents in
wireless networks and has published several research articles including more than twenty-five journal publications. He has
published an edited book on Wireless Sensor Networks in 2004 and on optical networks in 2000 and in 2004. He is a member of
the Editorial Board for ACM Wireless Networks Journal, IEEE Transactions on Mobile Computing, and KICS Journal of Computer
Networks. He has served as a Guest Co-Editor for special issues of ACM MONET on “Wireless Sensor Networks” in 2003 and 2004
and an issue of IEEE Journal on Selected Areas in Communications on optical WDM networks (2000). He is co-recipient of the
Best Paper Award at the IEEE International Conference on Networks 2000 held in Singapore. His work has been supported by several
sources including AFOSR, NSF, Cisco, Intel and Laboratory for Telecommunication Sciences. He is a member of the Editorial
Board for ACM Wireless Networks Journal, IEEE Transactions on Mobile Computing, and KICS Journal of Computer Networks. He
is serving as Technical Program Co-Chair for the First IEEE Conference on Sensor Communications and Networking to be held
in Santa Clara, CA in 2004. He has served as General Co-Chair for SPIE Opticomm 2003 (Dallas, TX) and for ACM Intl. Workshop
on Wireless Sensor Networks and Applications (WSNA) 2003 held on conjunction with ACM MobiCom 2003 at San Diego, CA. He served
as Technical Program Co-Chair of SPIE/IEEE/ACM OptiComm conference at Boston, MA in July 2002; and as Workshop Co-Chair for
WSNA 2002 held in conjunction with ACM MobiCom 2002 at Atlanta, GA in Sep 2002. He is a Senior Member of IEEE and a member
of ACM.
Kazem Sohraby received the BS, MS and PhD degrees in electrical engineering and the MBA from the Wharton School, University of Pennsylvania,
Philadephia. He is a Professor of the Electrical Engineering Department, College of Engineering, University of Arkansas, Fayetteville.
Prior to that, he was with Bell Laboratories, Holmdel, NJ. His areas of interest include computer networking, signaling, switching,
performance analysis, and traffic theory. He has over 20 applications and granted patents on computer protocols, wireless
and optical systems, circuit and packet switching, and on optical Internet. He has several publications, including a book
on The Performance and Control of Computer Communications Networks (Boston, MA: 1995). Dr Sohraby is a Distinguished Lecturer
of the IEEE Communications Society, and serves as its President's representative on the Committee on Communications and Information
Policy (CCIP). He served on the Education Committee of the IEEE Communications Society, is on the Editorial Boards of several
publications, and served as Reviewer and Panelist with the National Science Foundation, the US Army and the Natural Sciences
and Engineering Research Council of Canada. 相似文献
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大规模无线局域网规划设计研究 总被引:2,自引:0,他引:2
本文介绍了大规模无线局域网系统设计领域的研究现状,归纳了网络设计初期要解决的三个问题:用户需求分析、拓扑结构和协议标准,阐述了网络设计流程的四个阶段:服务区网格划分、接入访问点备选位置初定、接收信号强度测量、接入访问点放置和信道配置. 相似文献
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无线局域网安全问题研究 总被引:10,自引:0,他引:10
为了提供相当于有线局域网的数据安全,IEEE802.11定义了有线等价保密(WEP)协议。然而,最近的研究发现WEP存在严重的缺陷。介绍了无线局域网存在的安全隐患,分析了WEP的结构以及WEP协议的缺陷以及可能遭受的攻击,并探讨了改进方案。 相似文献
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本文对目前国际上小范围无线通信的主要成果作了介绍,并对以无线局域网(WLAN,Wireless Local Area Network)为典型应用的IEEE802.11x,蓝牙(BT、Bluetooth)SIG制定的小范围无线应用标准“蓝牙系统”、HomeRF、HIPERLAN2等作了分析比较。 相似文献
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孙建华 《微电子学与计算机》2006,23(9):212-214
文章针对IEEE802.11b协议在户外传输中存在的问题进行研究,通过对CSMA/CA协议的访问流程进行修改,利用时间片选择的随机性,降低不同站点发送数据的冲突概率,有效解决了“隐藏结点”和“低数据吞吐量”等问题。从而提高了在户外现场监控设备图象传输的效率,系统已经成功应用于油田的无人值守监控系统。 相似文献