[Ns-developers] Nakagami propagation loss model

[Jens Mittag]

Hi Bernhard,

> I'm not sure if the calculation of the RX-power in ns-3 by using the
> Nakagami propagation loss model is done correctly!
> In the literature I looked up the correlation between Nakagami and
> Gamma distribution. They adapt the parameters and then they take the
> square root of the gamma distributed value to get the nakagami
> distributed value.
> It seems to me that the step of taking the square root is missing in
> the class NakagamiPropagationLossModel. Only the parameters will be
> adapted there and that was it.

The literature typically uses the Nakagami distribution to describe the 
fading of the amplitude of a signal. Since we have a network simulator, 
were we have packets instead of signals, we do not look at the 
amplitude, but at the energy of the signal, which you typically get by 
taking the amplitude to the square. As such, the square root can be 
"saved" in the calculation.

I hope that clarifies it.
   Jens

-- 
Dipl.-Inform. Jens Mittag
Karlsruhe Institute of Technology (KIT)
Institute of Telematics
Decentralized Systems and Network Services Research Group

Zirkel 1, 76131 Karlsruhe, Germany
Building 20.20, Room 356.1

Phone: +49 (721) 608 5768
Fax:   +49 (721) 608 6789

http://dsn.tm.uni-karlsruhe.de/


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