Presentation on theme: "Dr. Samir Al Ghadban. EE 205 Term 121. Wireless and mobile data networks (WiFi, WiMax)"— Presentation transcript:
Dr. Samir Al Ghadban. EE 205 Term 121
Wireless and mobile data networks (WiFi, WiMax)
What is wireless communication ? Examples of wireless networks: 1 Wifi 2 WiMax Introduction
What is the wifi? Wireless fidelity ( wifi). History : it is invented in 1991 by NCR corporation. it is used for cashier system. Its name was WaveLan with speed 1-2Mbps. Wifi
Who invented wifi? The father of wifi is Vic Hayes.
Wifi refers to a type of Ethernet specified under the IEEE 802.11a and 802.11b standards for LANs operating in the 5 – 2.4 GHz unlicensed frequency bands respectively.
WiFi uses radio waves to transmit the information to and from the internet or your computer network. When a website wants to communicate with your computer it sends the information to your modem as it does now on your wired connection, then the information is passed on to a wireless router, which then converts it to radio waves and beams it to your computer. How does it work ?
Hotspots are areas where WiFi radio signals can be picked up by your computer. At home, a wireless router (such as the one shown at right) does the job to make your entire home a hotspot. What are WiFi Hotspots?
What is the wimax ? Worldwide interoperability for microwave access (WiMAX). Definition. wimax
Goal of wimax Provide high speed internet access to home and business subscriber.
Infrastructure: 1 access point 2 base station (BS) 3 subscribers stations( SS) How does it work ?
Tower (BS): similar to a cell phone tower. Can provide to coverage to a very large area( 8000 km). A wimax receiver: the receiver and antenna could be small box or PCMCIA card or could be built in a laptop.
During communication all information come from SS to the BS and retransmit to the right SS.
Range and data rate : Wi-Fi : around 30 meters. WiMAX : In theory 112 Km. expected value : 2 Km. ( under conditions). Wi-Fi : around 54 Mbit. WiMAX : In theory 70 Mbit. expected value : 10 Mbit. Comparing
Physical layer : Wi-Fi : operates at 2.4-5GHz. Wi-MAX : operates at 10 – 66GHz. Users: Wi-Fi: 1-10s for each CPE. Wi-MAX: 1-100s for each CPEs.
Cost: Wifi is cheap. Wimax is costly. Quality of service:
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