"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:cqmud35r5j7kp1pq0kqccnfggsupijre4q@4ax.com...
> nevtxjustin@gmail.com hath wroth:
>
>>Fortunately bandwidth modeling for WiFi is very easy...when you are a
>>professional in the biz.
>
> Ahem. I beg to differ. I've done quite a bit of modeling wireless
> data systems for various customers in the past. Strangely, I've never
> done a Wi-Fi system as all of them were various proprietary schemes
> designed to compensate for the deficiencies of Wi-Fi.
>
> I've looked at Wi-Fi with Mathcad 2000 and had problems because of the
> large number of outside influences that are difficult to include. For
> example, reflections, interference, multipath, proprietary
> enchancements, and creative implimentations, are all common with Wi-Fi
> systems.
Sounds like a typical day in the office for cellular engineers. Ray tracing
methods are now becoming popular in rf propagation software solutions.
I was interested in simulating various mesh network
> topologies, mostly to verify how close test results followed theory.
> Mesh adds additional complexity with routing algorthms, geographic
> routing, and long range timing problems. Throw in various fading
> models for moving clients, and life becomes really complex. I could
> ignore all the outside influences in the simulation, but then it
> wouldn't resemble reality. http://www.wavecall.com/accurate.php
>
> Unfortunately, I may have hit the limits of my abilities with Mathcad.
> If I ever get inspired to resurrect the exercise, I may to need an
> update to the latest version (13?), a copy of Simulink, and to get
> some qualified advice on where I screwed up and on how to continue.
> I'm also tempted to switch to MATLAB, which offers a library of models
> to plagerize:
> "IEEE 802.11a WLAN model"
> <http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=3540&objectType=FILE>
>
> "Simulation of an 802.11 Wireless Network"
> http://nislab.bu.edu/sc546/sc546Fall...less/index.htm
>
> "802.11b PHY MATLAB Code"
> <http://webscripts.softpedia.com/script/Communication-Tools/802-11b-PHY-MATLAB-Code-32206.html>
>
> "Modeling Multpath in 802.11 Systems"
> <http://www.commsdesign.com/story/OEG20021008S0001>
>
> Ugh... power going up and down. Later...
> --
> Jeff Liebermann jeffl@cruzio.com
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558