'Clear channel assessment' presentation slideshows

Final

Final. What is a wireless LAN?. WLAN, like a LAN, requires a physical medium to transmit signals. Instead of using UTP, WLANs use: Infrared light (IR) 802.11 does include an IR specification limitations, easily blocked, no real 802.11 products (IrDA) Radio frequencies (RFs)

789 views • 63 slides

Interference Models: Beyond the Unit-disk and Packet-Radio Models

Interference Models: Beyond the Unit-disk and Packet-Radio Models. Andrea W. Richa Arizona State University. Ad hoc Networks . Wireless stations communicating over a wireless medium with no centralized infrastructure How to model ad hoc networks?

706 views • 53 slides

Modeling of Wireless Sensor Networks for Localization and Mobile Targets Tracking ?????????????????????

Modeling of Wireless Sensor Networks for Localization and Mobile Targets Tracking ?????????????????????. Prasan Kumar Sahoo Dept. of Information Management Vanung University ??? ???????????? Present by C.T. Lee 2007 / 4 / 16, 30. Educational Background ?????????????

722 views • 53 slides

MAC & Physical Layers (1 September, 2006)

MAC & Physical Layers (1 September, 2006). Objectives. Upon completion of this chapter you will be able to:. Explain how a client joins a network Describe the modes of operation wireless LANs use to communicate Explain how wireless LANs avoid collisions on the network

523 views • 46 slides

Wireless Sensor Networks: a Survey on the State of the Art and the 802.15.4 and ZigBee Standards

Wireless Sensor Networks: a Survey on the State of the Art and the 802.15.4 and ZigBee Standards. Final Presentation 5 August 2008 Omer Alkhnbashi. Content. ZigBee and IEEE802.15.4 Overview IEEE 802.15.4 PHY. IEEE 802.15.4 MAC. ZigBee Functional Layers Architecture & Protocol Stack.

691 views • 43 slides

Z-MAC: A Hybrid MAC for Wireless Sensor Networks

Z-MAC: A Hybrid MAC for Wireless Sensor Networks. Injong Rhee, Ajit Warrier, Mahesh Aia, Jeongki Min and Mihail L. Sichitiu North Carolina State University IEEE/ACM Transactions on Networking Vol. 16, No. 3, June 2008. Outline. Introduction Related Work Design of Z-MAC Performance Results

605 views • 42 slides

The Case for Heterogeneous Wireless MACs

The Case for Heterogeneous Wireless MACs. Chun-cheng Chen Haiyun Luo Dept. of Computer Science, UIUC. C. A. B. CS. CS. CS. RSS. RSS. CS Thrshld. CS Thrshld. Problem#1: intra-BSS interference. Clear channel assessment (CCA): transmit iif RSS < CS threshold

347 views • 23 slides

Simulation of 20/40 MHz CCA Unfairness

338 views • 21 slides