Does anybody have Octave code to draw Rayleigh fading envelope?

[Andreas Yankopolus]

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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