[Ns-developers] Code review request for 802.11b physical model

[Ruben Merz]

Hi Tom, hi all,

This is nice work. In section 1.2.4, you wonder whether the noise floor
can be modulation dependent. I think it can, and it probably does not
only depend on the modulation but also on the center frequency of the
transmission (see the figure on the bottom right of slide 8 of the talk
I gave at the ns-3 workshop). This might actually be interesting as next
step: to see how the RSSI values depend on the center frequency. Also,
is there for you the possibility to use other 802.11 hardware for the
validation?

Also, what kind of channel model was used for the analytical results and
the emulation results? Was there any fading or multipath? Because, this
would definitely change the results. From what I read, I understand it
is a free space model. I am correct? For me, this also is an important
issue to look at, especially with most people using 802.11 link indoor.

Looking at Fig 1.6, I'm not sure I understand the meaning of it. For
unicast, you should look at the number of received packets independently
of the retransmissions. Then you would probably get the same results
than in 1.5.

Best
Ruben

Tom Henderson wrote:
>> -----Original Message-----
>> From: Mathieu Lacage [mailto:mathieu.lacage at sophia.inria.fr]
>> Sent: Thursday, May 28, 2009 10:16 AM
>> To: 'Pei, Guangyu'
>> Cc: 'ns-developers'
>> Subject: Re: [Ns-developers] Code review request for 802.11b physical model
>>
>> the whole patchset looked pretty good so, I pushed it as-is.
>>
>> Mathieu
>>
> 
> Thanks for the fast response and for updating RELEASE_NOTES.  As the document shows, Gary did a lot of validation work already with that model, but we'd be interested in feedback from others on what was done there and what more could be done as next steps.
> 
> One other item to note is that the example program is really a validation program and can be moved into a validation or tests/ directory whenever we converge on a directory for that.  And I'd like to move the validation document to a document directory in our main html tree and add links to it.
> 
> Tom
> 
> 
> 

-- 
Ruben Merz                   Deutsche Telekom Laboratories
http://www.net.t-labs.tu-berlin.de/people/ruben_merz.shtml