Re: Does anybody have Octave code to draw Rayleigh fading envelope?

[YanXT]

2008/10/2 Illidan Modeler <address@hidden>:
> 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.
>

please specify the formula of the envelope you want to plot.
I'll try it.

--
Alex

> Thanks.
>
> On Thu, Oct 2, 2008 at 6:31 PM, Andreas Yankopolus <address@hidden> 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
>>
>> _______________________________________________
>> Help-octave mailing list
>> address@hidden
>> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
>>
>>
>
>
>
> --
> Northern Capital, the Republic of Pandaria
> http://illidan.cublog.cn
> _______________________________________________
> Help-octave mailing list
> address@hidden
> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
>