wireless wide area networks ppt

... 9 Wireless Local Area Networks 9.1 Introduction The growth of Wireless Local Area Network (WLANs) commenced in the mid-1980s and was triggered ... other wireless technologies, in order to offer support for mobile computing applications, of perceived performance equal to those of wired communication networks Wireless Local Area Networks ... Summary In this chapter we cover the area of Wireless Local Area Networks by focusing on a number of issues: † WLAN topologies The two types of wireless LAN topologies used today are

Ngày tải lên: 29/09/2013, 21:20

... wireless networks can in general be divided into five different categories, including wireless regional area networks (WRANs), wireless wide area networks (WWANs), wireless metropolitan area networks ... networks (WWANs), wireless metropolitan area networks (WMANs), wireless local area networks (WLANs), and wireless personal area networks (WPANs) The IEEE standards association establishes five ... Introduction A wireless network is a type of computer networks that utilizes wireless communication technologies to maintain connectivity and exchange messages between stations over wireless media,

Ngày tải lên: 21/06/2014, 17:20

... Applications of wearable and implanted wireless sensor devices are hot research area. A specialized field called the body area networks (BAN) has emerged to support this area. Managing and controlling ... efficient MAC protocol for wireless body area networks Moshaddique Al Ameen 1 , Niamat Ullah 1 , M Sanaullah Chowdhury 1 , S M Riazul Islam 1 and Kyungsup Kwak* 1 1 UWB Wireless Communications ... versions will be made available soon. A power efficient MAC protocol for wireless body area networks EURASIP Journal on Wireless Communications and Networking 2012, 2012:33 doi:10.1186/1687-1499-2012-33

Ngày tải lên: 21/06/2014, 17:20

... cited Wireless Underground Sensor Networks (WUSNs) constitute one of the promising application areas of the recently developed wireless sensor networking techniques WUSN is a specialized kind of Wireless ... can also be applied to generic WSN testbeds 1 Introduction Wireless Underground Sensor Networks (WUSNs) are a natural extension of the wireless sensor network (WSN) phenomenon to the underground ... 620307, 14 pagesdoi:10.1155/2010/620307 Research Article Development of a Testbed for Wireless Underground Sensor Networks Agnelo R Silva and Mehmet C Vuran Department of Computer Science and Engineering,

Ngày tải lên: 21/06/2014, 23:20

... Throughput-Based MAC Layer Handoff in IEEE 802.11 Wireless Local Area Networks SungHoon Seo,1 JooSeok Song,1 Haitao Wu,2 and Yongguang Zhang2 Department Wireless of Computer Science, Yonsei University, Seoul ... Recommended by Naveen Chilamkurti We propose a MAC layer handoff mechanism for IEEE 802.11 Wireless Local Area Networks (WLAN) to give benefit to bandwidthgreedy applications at STAs The proposed mechanism ... As wireless networking grows in popularity, various radio access technologies have been developed to provide better environment for user data service Most of all, IEEE 802.11 Wireless Local Area

Ngày tải lên: 21/06/2014, 23:20

... of wireless mobile devices, such as notebook PC, PDA, and smart phone, has greatly promoted multimedia applications over wireless ad hoc networks. Transferring real-time video streams over a wireless ... is becoming an important research area of how to discard packets intelligently on IN for improving the quality of video streams over multi-hop wireless ad hoc networks. Previous works on improving ... early packet discards (I-EPD) for real-time video streaming over a multihop wireless ad hoc network. In a multihop wireless ad hoc network, the quality of transferring real-time video streams

Ngày tải lên: 21/06/2014, 23:20

... RF TRANSCEIVER FOR WIRELESS BODY AREA NETWORKS (WBAN) M.KUMARASAMY RAJA NATIONAL UNIVERSITY OF SINGAPORE 2011 Trang 2ENERGY AWARE RF TRANSCEIVER FOR WIRELESS BODY AREA NETWORKS (WBAN) M.KUMARASAMY ... Works 107 List of Publications 109 BIBLIOGRAPHY 110 Trang 7SUMMARY Transceivers for wireless body area networks (WBAN) are expected to consume low power for long battery life or to operate ... both carrier generation in the transmitter and SRO in the receiver saving the silicon area Such reduction of area assumes importance in implanted applications The transmitter and receiver maintain

Ngày tải lên: 09/09/2015, 18:49

... Trang 1Wireless Networks Lecture 39 Bluetooth/Wireless Personal Area Networks (WPAN) Dr Ghalib A Shah Trang 4What is Bluetooth? “Bluetooth wireless technology is ► an ... technology ► for ad-hoc wireless communication of ► voice and data anywhere in the world.” Trang 55Ultimate HeadsetTrang 6Cordless ComputerTrang 7Bluetooth Application Areas  Data and voice ... in range Trang 8Overview of Bluetooth History What is Bluetooth? ► Bluetooth is a short-range wireless communications technology.  Why this name? ► It was taken from the 10th century Danish

Ngày tải lên: 05/07/2022, 13:26

... Trang 1Wireless Networks Lecture 40 High Rate Wireless Personal Area Networks (WPAN) Dr Ghalib A Shah Trang 2• Handing over control of ... Trang 10IEEE 802.15.3 - Overview  Based on piconets in a person space analogous to LAN in larger area  Data Devices (DEV) establish peer-to-peer communication  Includes also a Piconet Coordinator ... established piconet The established piconet then becomes the parent piconet either extending the area of coverage of the piconet or shifting some computational or capable DEV ► The child piconet

Ngày tải lên: 05/07/2022, 13:26

... on Wireless Communications and NetworkingVolume 2011, Article ID 921623, 15 pages doi:10.1155/2011/921623 Research Article Interference-Aware Radio Resource Management for Local Area Wireless Networks ... intensive local area networks, emerging and next generation wireless systems should favor such signaling-intensive cooperation schemes The following observations support our view (i) Local area network ... proposed scheme enables fair and efficient wireless access in challenging interference scenarios, for example, multiple networks deployed in the same geographical area and sharing a common band 1 Introduction

Ngày tải lên: 21/06/2014, 05:20

... The Case for Virtual Local Area Networks (VLANs) 1-800-COURSES www.globalknowledge.com Expert Reference Series of White Papers Introduction In ... Coaxial Cable-Based Ethernet To simplify the installation of Ethernet networks, a change was made to the network topology . Networks were converted from coaxial cable to twisted pair cabling by ... hub , networks became more crowded. A solution to the problem was necessary. Figur e 2. Hub-Based Twisted Pair Ethernet Ted Rohling, Global Knowledge Instructor, CISSP The Case for Virtual Local Area Networks

Ngày tải lên: 17/01/2014, 06:20

... modules to provide for a wide spectrum of data sensitivity and a diversity of application environments Four security levels are specified for each of 11 requirement areas These 11 areas are sections ... Division Building and Fire Research Laboratory Gaithersburg, MD 20899-8631 NISTIR 7009 BACnet Wide Area Network Security Threat Assessment David G Holmberg U.S DEPARTMENT OF COMMERCE National ... communicating across the Internet, communication to remote BACnet networks is also possible via a temporary point-to-point (PTP) connection 4.2 BACnet networks 4.2.1 Current network configurations Most building

Ngày tải lên: 14/03/2014, 22:20

... vertical handover techniques in heterogeneous wireless networks, by introducing a hybrid scheme for connectivity support 6 . Different wireless networks exhibit quite different data rate, data ... (2010) Network Integration in 3G and 4G Wireless Networks, Proceedings of 19th International Conference on Computer Communications and Networks (ICCCN), pp.1-8, August 2010 Balasubramaniam ... multinetwork environments, IEEE Wireless Communications, Vol 11, Issue 3, pp 8–15, June, 2004 244 Recent Advances in Wireless Communications and Networks Pollini G P ( 199 6)

Ngày tải lên: 19/06/2014, 19:20

... Conditioning Wireless Sensing Unit Wireless Sensing Unit Structural Sensors Signal Conditioning Structural Sensors Signal Conditioning Wireless Sensing Unit Structural Sensors Signal Conditioning Wireless ... corresponding to the wireless data are computed online in real-time by each wireless sensing unit After each wireless sensing unit executes its FFT algorithm, the FFT results are wirelessly transmitted ... between the wireless sensing nodes and control nodes Wireless Sensing Nodes (Clock-driven) Wireless Control Nodes (Event-driven) ITERATE { Wait for the assigned time slot Sample sensor data Wirelessly

Ngày tải lên: 19/06/2014, 19:20

... other types of networks. Keywords: Intercell interference power, Statistical modeling, Wire less networks, Rayleigh fading, lognormal shadowing I Introduction In the emerging wireless communication ... the intercell interference power in the downlink of wireless cellular networks EURASIP Journal on Wireless Communications ... efficiency [18-20]. The analysis of interference in dense asynchronous networks, such as ad hoc net- works, is also an active research area, for which a deep review of the recent developments can be

Ngày tải lên: 21/06/2014, 00:20

... of wireless CDMA networks the interference coefficient g ij (t) would model the residual interference at the output of despreading filter of node rec(j)[7]. Similarly, in the case wireless SDMA networks ... that in networks where the nodes are located far apart (e.g., cellular type of wireless networks), the accuracy of self- interference cancellation is more stringent as compared to that in networks ... in multi-hop wireless networks in the presence of self interference,” in Proceedings of the 8th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt

Ngày tải lên: 21/06/2014, 11:20

... for media streaming over wired networks has been exploited for a long history [7]. Nowadays, as the rapid developmentofmultihopwirelessnetworkssuchaswireless mesh networks [1], proxy caching for ... caching management for streaming data. 1. Introduction Multihop wireless networks as wideband Internet access solutions have been widely researched nowadays, and pro- mote some real deployments ... management [22], energy improvement in wireless networks [23], data gossiping [24], as well as data dissemination in sensor networks [11] and in peer-to-peer networks [15]. For storage systems,

Ngày tải lên: 21/06/2014, 17:20

... 8-PSK CDMA2000 1xRTT ã Operates on two 1.25 MHz -wide frequency channels ã Supports 144 Kbps packet data transmission 2 Objectives ã Describe wireless wide area networks (WWANs) and how they are used ã Describe ... 1xEVDO ã For 2.5G CDMA2000 1xRTT networks 25 Binary Runtime Environment for Wireless (BREW) ã BREW is a thin software environment Very small program that resides on a wireless device ã Capable ... (continued) ã Short Message Services (SMS) One of the most widely used applications – Allows for the delivery of short, text-based messages between wireless devices ã Messages are limited to about 160...

Ngày tải lên: 13/09/2012, 10:52

... and Wide Area Networks OL-14760-01 Design Considerations ã Use of EIGRP stub areas eliminates queries to spoke routers. ã OSPF must periodically synchronize router databases within an area, ... with inline power ã Wireless access points ã QoS, firewall, and web caching with IP voice gateway functions 21 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 ... suffer. Spokes Hubs virtual circuit 221485 3 Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01 Introduction For additional information on V3PN deployments, the following...

Ngày tải lên: 21/12/2013, 06:15