Does anybody have Octave code to draw Rayleigh fading envelope?

[Illidan Modeler]

Hi Andreas,

I'm quite interested in your C code. Do you mind sending a copy to the
List or me?

I read the Wikipedia entry before I started this thread. And in J. I.
Smith's paper in 1975, there's a similar figure of a Rayleigh fading
envelope. That's exactly what I need to make by Octave or C right now.

Thanks.

On Thu, Oct 2, 2008 at 6:31 PM, Andreas Yankopolus <andreas at yank.to> wrote:
> Illidan,
>
> Thanks for your reply.
>
> There are a number of papers and scripts that deal with BER-SNR curve. But I
> need to compute amplitude-time curve, as given in a paper by J. I. Smith in
> 1975, with the title "a computer generated multipath fading simulation".
> This paper even gives listing of source code. But it's not
> Matlab/Octave code (seems like Fortran that I don't read).
>
> I have some C code to do this that I wrote for my Ph.D. work if you're
> interested.
> The original method for creating a time realization of Rayleigh fading
> appears in Jakes' book Microwave Mobile Communications. It sums together a
> large number of sinusoids with random phases and amplitudes to produce an
> approximation of the of the envelope (the PSD doesn't go to infinity like
> theoretical one). A refinement of that model by Dent, Bottomley, and Croft
> in Jakes' Fading Model Revisited uses Walsch-Hadamard matrices the scale the
> sinusoids and has better cross-correlation properties in applications where
> you're creating multiple envelopes simultaneously.
> I did some quick Googling, and the Wikipedia page gives the needed formulas:
> http://en.wikipedia.org/wiki/Rayleigh_fading
> Cheers,
> Andreas
>
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