extending range of wireless networks

... 213 Index404 14 Economics of Wireless Networks 14.1 Introduction The field of mobile wireless communications is currently one of the fastest growing segments of the telecommunications industry. Wireless devices ... for wireless telecommunication companies. This chapter overviews several economic aspects of wireless networks, including economic benefits of wireless networks, facts that affect the economics of ... Changing Economics of the Wireless Industry The movement towards integration of wireless networks and the Internet has reached a point which marks a change for the business of the wireless industry....

Ngày tải lên: 29/09/2013, 21:20

... of these measures actually thwarts the overall goals of the wireless provider – to deliver cost- effective, always available, high quality services. Operations: The Custodians of Evolving Networks Wireless ... meeting the needs of Operations by designing and implementing the physical layer with a foundation of connectivity. Designing for Profitability in the Physical Layer of Wireless Networks Introduction Growth ... maintenance and troubleshooting of a steadily growing network infrastructure. Clearly, the physical layer of the wireless network is getting larger and more complex. With more wireless data services...

Ngày tải lên: 21/12/2013, 08:17

... enhance- ment in wireless networks. The fourth paper, by S. Guo et al., considers the prob- lem of maximizing the network lifetime for both single and multiple multicast connections in a wireless ad ... the dynamic of network conditions. The au- thors prove the global asymptotic stability of the equilibrium based on Lyapunov theory. Simulation results indicate that REAQM is capable of performing ... mechanisms, to achieve this end, and a num- ber of different means of obtaining the configurations them- selves. They describe an analytical model of the system un- der consideration and present...

Ngày tải lên: 22/06/2014, 19:20

... aware of their geographic position and those of their neigboring nodes. The algorithms take advantage of geometric proper- ties of planar networks, constructing a planar subgraph of a given wireless ... Downton Handbook of Wireless Networks and Mobile Computing / Ivan Stojmenovic´ (Editor) HANDBOOK OF WIRELESS NETWORKS AND MOBILE COMPUTING Edited by Ivan Stojmenovic´ University of Ottawa Universidad ... Introduction 1 1.2 Types of Handoffs 1 1.3 Handoff Initiation 2 1.4 Handoff Decision 4 1.5 Handoff Schemes 4 1.6 Summary 24 References 24 2 Location Management in Cellular Networks 27 Jingyuan Zhang 2.1...

Ngày tải lên: 13/08/2014, 12:21

... channel because of the increased possibility of various kinds of in- terference that appear mainly during the busy hours of the system. Hence the use of tech- niques that are capable of ensuring ... multicoloring of G of span m, i.e., ␹ (G, w) is the optimal number of colors required to properly multicolor G. Let the weight of a maxi- mal clique in (G, w) be defined as the sum of the weights of the ... 3-coloring. tasks of resource management more and more crucial [44]. Some of the important objec- tives of resource management are the minimization of the interference level and handoffs as well as...

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 13/08/2014, 12:21

Ngày tải lên: 24/08/2014, 17:21

... Introduction 1.1 The Need for Third-Generation Wireless Technologies The first generation of wireless networks was primarily concerned with the provision of voice services, allowing users to transition ... One source of co- channel interference, de-correlated in time with 0 frequency offset. One source of adjacent channel interference, de-correlated in time with 200 kHz of frequency offset. One ... One source of co-channel interference, de-correlated in time with 0 frequency offset. One source of adjacent channel interference, de-correlated in time with 200 kHz of frequency offset. One...

Ngày tải lên: 26/04/2013, 11:15

Ngày tải lên: 18/10/2013, 12:15

... Performance analysis of wireless networks with directional antennas. IEEE Transactions on Vehicular Technology 57, 5 (2008), 3187–3199. 16 Eavesdropping range Indoor noise floor Outdoor noise floor Boosted range Amplified noise ... speeds of automobiles raise questions about the feasibility of eavesdropping. In this section, we experimentally evaluate the range of TPMS communications and further evaluate the feasi- bility of ... we studied the reception range of stand-alone sensors in a hallway. In the outdoor environment, we drove one of the authors’ cars around to measure the reception range of the sensors mounted in...

Ngày tải lên: 23/03/2014, 10:20

... security and are often used in security-related discussions, in the context of computer networks. The basic security needs of wireless ad hoc networks are more or less the same as those of wired networks. ... schemes of the wire-line networks have been developed and implemented in wireless cellular networks. To make ad hoc networks secure, we need to find ways to incorporate some of these schemes of wireless ... and quality of service in ad hoc wireless networks. Starting with a review of the basic principles of ad hoc wireless networking, coverage progresses to the vulnerabilities these networks face...

Ngày tải lên: 25/03/2014, 12:07

... Journal of Science, Mathematics - Physics 23 (2007) 55-62 55 Congestion control of Wavelet image compression over wireless networks Ho Anh Tuy 1 , Nguyen Vinh An 2,* 1 Hanoi University of ... Abstract. The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There ... congestion control of ATM networks have been published. A survey is given in [5]. 3.2. Fuzzy logic implementation A wireless networks is a large distributed complex system with difficulty of highly...

Ngày tải lên: 28/03/2014, 13:20

... 2009. On the Lifetime of Wireless Sensor Networks • 5:39 SORO,S.AND HEINZELMAN, W. B. 2005. Prolonging the lifetime of wireless sensor networks via unequal clustering. In Proceedings of the 19th IEEE ... 2002b. Wireless sensor networks: A survey. Elsevier Comput. Netw. 38, 393–422. A RAMPATZIS, T., LYGEROS,J.,AND MANESIS, S. 2005. A survey of applications of wireless sensors and wireless sensor networks. ... International Conference on Wireless Networks (ICWN). C HIASSERINI , C F., C HLAMTAC , I., M ONTI,P., AND NUCCI, A. 2002. Energy efficient design of wireless ad hoc networks. In Proceedings of the 2nd IFIP...

Ngày tải lên: 28/04/2014, 13:38