[Ns-developers] spectrum modeling [was: ns-3.5 planning]

[Ruben Merz]

Hi Nicola,

Comments below,

On 4/17/09 11:41 AM, Nicola Baldo wrote:
> Hi again,
>
>> if there is an item you are working on and you believe should be
>> considered for this new release cycle which will end in mid-june with a
>> new release, please, let me/us know _now_.
>
> I have also been working on spectrum modeling, as I anticipated some
> time ago on this list. What is available right now is the following:
>
> 1) a class (ValuesVsFreq) providing the representation of
> frequency-dependent things (such as spectral power density, propagation
> loss, tx/rx mask...);
>
> 2) interfaces definitions for the spectrum-aware channel, phy and
> propagation loss model (delay model is the same as wifi);
>
> 3) a basic but usable implementation of the channel and the
> spectrum-aware version of the Friis propagation model;
>
> 4) two sample PHY layer implementations (WaveformGenerator and
> SpectrumAnalyzer) and a couple of test scripts to test everything and
> show how it works.

Could you explain a bit what these two (WaveformGenerator and 
SpectrumAnalyzer) are?

>
> What is still missing are PHY layers to be used within a NetDevice
> context, and in particular something that can work with the current wifi
> code -- either some code which can interact with the existing
> YansWifiPhy, or a brand new WifiPhy implementation. I plan to be working
> on this issue the near future.
>
> You can find the code here:
> http://code.nsnam.org/nbaldo/ns-3-dev-spectrum/
>
> Any feedback would be very much appreciated, as well as any intent to
> cooperate in this development. I would be happy to have all this code

As we already discussed at the ns-3 workshop last month, we are slowly 
moving forward in terms of setting up measurements  for the validation 
of the physical layer. I believe that your code could be the right place 
to start integrating the results of our measurements, especially for 
propagation issues and frequency dependent behavior. What do you think?

Best
Ruben

> included in ns-3-dev at some point, but I am not sure of whether this
> can happen for ns-3.5. The point in favor of this is that the new
> features do not mess up with existing code, so including it does no
> harm. The point against is that at the moment there is still nothing
> which can be really useful for practical purposes; more modules need to
> be developed for this.
>
> Regards,
>
> Nicola
>
>
>
>

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