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Introduction to Ad hoc Networks - Department of …

1-1 Introduction to Ad hoc NetworksCS-647: Advanced Topics in Wireless NetworksDrs. Baruch Awerbuch & Amitabh MishraDepartment of Computer ScienceJohns Hopkins University Amitabh Mishra & Baruch Awerbuch 20081-2 Outline What is an ad hoc network ? Challenges facing ad hoc Networks History of Ad hoc Networks General Concepts Introduction to IEEE Physical Layers of C. K. Toh, Chapter 3, Ad Hoc Wireless Networks , Prentice Hall, 2002 D. P. Agrawal and Qing-An Zeng, Chapter 13, Wireless & Mobile Systems , Thompson/Brooks Cole, 2003 Refer one of the suggested textbooks1-4 Types of Wireless Networks : infrastructure vs. ad-hoc networksinfrastructurenetworkad-hoc networkAPAPAP wired networkAP: Access Point Infrastructure Networks Fixed, wired backbone Mobile communicates directly with access points Suitable for locations where access points can be placed Cellular networks1-5 Cellular Networks UMTS (3G)UMTS Core NetworkCircuit Switched NetworkUTRANMAPGiIuISUPGSM NetworkSS7 NetworkPacket Data Network1-6 Why Ad Hoc Networks ?

Operates in the unlicensed 2.4 GHZ ISM (Industrial & Scientific & Medical) Band 802.11 MAC works with different physical layers (infra red as well as spread spectrum) Compatible with other 802.x standards, e.g. 802.3 (Ethernet), 802.5 (Token ring) Data rates 1 Mbps (mandatory), 2 Mbps (optional)

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  Introduction, Network, Spectrum, Spreads, Spread spectrum, Introduction to ad hoc networks

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