A Technical Seminar Presentation on WIMAX ( Worldwide Interoperability for Microwave Access ) BY M.K.V HARSHA VARDHAN REDDY-07K81A0440

INTRODUCTION  A Wireless local area network (LAN) is a flexible data communication system implemented as an extension to or as an alternative for, a wired LAN.  Examples of wireless technologies includes, Wi-Fi (IEEE ), Bluetooth, WiMAX (IEEE ), and more.  This paper discusses the Wireless LANs and the functional parts of a WIMAX system with its basic operation.  Using radio frequency (RF) technology, wireless LANs transmit and receive data over the air, minimizing the need for wired connections.

GOALS OF WIMAX The goal of WiMAX is to provide high-speed internet access in a coverage range several kilometers in radius. WiMAX provides about 70Mbps with a range of 50 kilometers. WiMAX standard has the advantage that it can support both LOS ( line of sight ) as well as NLOS( non line-of-sight ) Providing portable mobile broadband connectivity across cities and countries through a variety of devices.

OPERATING PRINCIPLE OF WIMAX  The IEEE standard have two categories  Fixed WiMAX : provides for fixed line communication with an antenna mounted on a rooftop, like a TV antenna.  Mobile WiMAX : allows mobile client machines to be connected to the internet. Mobile WiMAX opens the doors to mobile phone use over IP, and even high-speed mobile services.

A WiMAX tower : similar to the concept of phone tower, which can provide the coverage to rural areas.  A WiMAX receiver : the receiver and antenna could be a small box or PCMCIA( Personal Computer Memory Card International Association ) card.  Non-line-of-sight : this is Wi-Fi sort of service where a small antenna on your computer connects to the tower,which uses a lower frequency range –2GHz to 11GHz.  Line-of-sight : Here a fixed dish antenna points straight at the WiMAX tower from a rooftop or pole, which is more stable and stronger connection.This uses a frequency range of possibly 66GHz

WIMAX SYSTEM TYPES

 Some of the different types of uses that WiMAX provides  Point to Point (PTP) : Here the connection may be independent from all other systems or networks.  Point to multipoint(PTMP) : It allows a radio system to provide services to multiple users.  WiMAX can also be setup as mesh networks allowing the WiMAX systems to forward packets between the base stations and subscribers without having to install communication lines between the base stations.

WIMAX OVER OTHER TECHNOLOGIES 3GWi- Fi WiMAX MOBILE- Fi Max speed2Mbps54Mbps100Mbps16Mbps CoverageSeveral miles300 feet50 milesSeveral miles AirwavesLicensedUn-licensedEitherLicensed AdvantagesRange,mobility Speed, priceSpeed,rangeSpeed,mobility Disadvantag es Slow, expensive Short rangeInterference issues High price

DISADVANTAGES OF WIMAX Bad weather conditions such as rain could interrupt the signal. High installation and operational cost. Other wireless equipment could cause interference. WiMAX cannot deliver 70 Mbit/s over 50 kilometers (31 miles). Like all wireless technologies, WiMAX can operate at higher bitrates or over longer distances but not both.

CONCLUSION  Within five years,we expect WiMAX to be the dominant technology for wireless networking.  As the cellular operators move to IP based 4G systems they will include WiMAX.  WiMAX advantages exceed the performance and cost advantages that people talk about always.  Wireless networking is the best thing to happen to the Internet in a very long time! With the thousands of new hot spots being created, this year alone, staying in touch by will come as naturally as breathing!