[Ns-developers] PropagationLossModel behaviour

[Mathieu Lacage]

On Tue, 2008-06-03 at 13:21 -0400, Joseph Kopena wrote:

> Alternatively, you could get away with something approximate.  For
> example: Sometime soon I need to produce some network state
> visualizations for a paper, most likely using Mathieu's WiFi model.
> I'm leaning toward plotting the radio ranges via some mechanism like
> plotting circles at the distance w/ 95% chance of successful delivery.
>  Note that this is more reasonable for a homogenous environment, as
> I'm using currently, where the receiver stats in some sense don't
> matter.  If nodes could have different receivers then I would probably
> try and plot expected distance for a given power level, but the former
> sounds easier.

What is critical to chose this "range distance" is:
  - tx power
  - packet size
  - transmission mode

All of the above will change a lot the value of your range distance
while the exact psr ratio (95 vs 98 vs 99 vs 80) is not going to change
the range distance very much because the psr drop is always very sudden
vs distance.

For example, here is the psr vs distance for 6mbs with the lowest tx
power and two different packet sizes.

regards,
Mathieu

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