Re: [ns] link questions

[Wei Ye <wei@catarina.usc.edu>]

There is currently no detailed physical-layer simulation such as
modulation and coding.

There is a shadowing propagation model that characterize the fading effect
of the wireless channel. There is also a two-ray ground reflection model
that reflects the large-scale path loss. They're used to calculate the
received power of each packet. However, these are NOT small-scale models
(on the bit level) that characterize the inter-symbol interference
(ISI) or doppler effect of the signal.

I think ns is able to incoporate these models if you'd like to implement
them by yourself.

Wei

On Mon, 5 Mar 2001, Raymond Wang wrote:

> hi,
> 
> does ns have support for multiple digital modulations? Rayleigh or various
> fast fading models?  Delay Spread/ISI?
> Noise figure/Noise Spectral Density? Channel Coding (if so, what types)?
> 
> OR is ns too high-level for these issues?
> 
> thanks,
> ray
>