Notes

Wimax Forum Started on 7th April 2003

Members : Intel , Fujistui ( Chip Makers ) , Nokia , Airspan Networks , OFDM OFrum

“First Statements Does Not want to replace DSL or WiFi”

-> Last Mile , Non Line of Site like other satellite services

Average Speed of 70mb/s

Intel Big on Open Switchable Standards for Wireless ( Wimax –> Wifi –> Bluetooth on same chip , Centrino , Rosedale Wimax Chip?)

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Commerical Companies

Provider

http://www.wimanx.com

Country: UK

Cities : Douglas, Onchan, Glen Vine, Braddan

http://www.urbanwimax.co.uk

Country: UK

Cities : Central London

http://www.freedom4wifi.com/ (Pipex Intel Venture)

Country: UK

Cities : Unkown

Products

http://www.redlinecommunications.com/products/RedMAX.html

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http://www.theregister.co.uk/2004/12/10/wimax_steal_market_share/

http://www.theregister.co.uk/2005/01/10/wimax_critical_year/

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Email

So After my site got exploited through one of many out of date test applications , I pulled down my old site ( Redirected to Google) , and put a blog up for my work log for my dissertation , unknown to me my site is back on Google ( After being removed due to the exploit involving a page rank hack ( Sorry Google ) , And I have had my frist spam comment message!!! This Calls for a Spam Celebration!!!

Spam Celebration

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¬†After ongoing communication with Opnet , I have found the Model’s myself curtsey of yours truly:

http://www.it.iitb.ac.in/~opnet/

Unfortunately only works on opnet version’s higher then the free student edition (9.5) , so need to contact lab supervisor

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Modelling Wireless

Followed through Opnet Tutorial tutorial to work with wireless lans in Opnet ( I have emailed WiMax forum for Wimax Models)

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How To Model a wired network

How to work with scenario’s and describe the differences between senarios

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  • ATM Quality
  • On the Fly Trade Up Between Raw Capcity of Line and Quality
  • Backhaul is how one Wimax tower would speak to the other ( 5Ghz Range )
  • Needs to be Lower the 10 Ghz Due to the Technogy for Long Distance

Non Line Of Site ( Convient forMobile Users )

  • Lower Frequency ( Under 10 Ghz )

Line Of Site ( Higher Bandwidth Lower Error Rates )

  • Higher Frequency (10 – 66Ghz )

Inverse Fast Fourier Transform is used in a WiMAX transmitter

Fast Fourier Transform) is used in a WiMAX receiver

How It Works?

  1. Base Stations want to communicate with WiMax Access Point By Random Interupt
  2. MAC uses scheduling Algorithm
  3. Once Completed they are given a Slot at the access point which can be adjusted and will remain the base stations untill not needed
  4. QoS Is Balanced By the access point depending on the users QoS Settings

Transmitter and Receiver RF chains in WiMAX

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