Phase Noise Modeling

Hi.

I am trying to model oscillator phase noise using Matlab m-code. I know 
there is a phase noise blockset in the simulink. I looked under the blockset 
mask and learnt that the phase noise is modelled by passing AWGN noise 
through a direct form II transposed (DF2T) filter whose shape is probably 
1/f. If given another type of frequency response of a phase noise model, how 
do I generate the filter coefficients for the DF2T filter?

Is the Matlab function 'Yulewalk' sufficient to generate these filter 
coefficients?

Thanks!

-- 
Regards,
kc 

If you search comp.dsp with the phrase

"simulation of 1/f noise"

you will find a link to an old post which contains Matlab code to do
just that.

Regards,
Andor

"Andor" <an2or@mailcircuit.com> wrote in message news:<1114070997.337971.263040@z14g2000cwz.googlegroups.com>...
> If you search comp.dsp with the phrase
> 
> "simulation of 1/f noise"
> 
> you will find a link to an old post which contains Matlab code to do
> just that.
> 
> Regards,
> Andor

Hi Andor,

Thank you very much for pointing out the link. I will try that out
first thing next morning.

I note that the Matlab code models a 1/f noise model. If a specific
non 1/f noise model is to be modelled, is there a way to do it?

Regards,
kc

I guess that kind of depends how non-1/f the noise model is. You should
also find a link to the following paper

N. J. Kasdin, "Discrete Simulation of Colored Noise and Stochastic
Processes and 1/f^a Power Law Noise Generation," Proceedings of
the IEEE, May, 1995.

It is a nice read. If you still have questions after that, come back
here.

Regards,
Andor

I have verified the Matlab code in a QPSK modulation system with a similar 
one that is built on simulink. The BERs matched :)

Have obtained the paper too.... 26 pages! Will certainly try to read it. 
Thks Andor.

Regards,
kc

"Andor" <an2or@mailcircuit.com> wrote in message 
news:1114158399.566733.229080@o13g2000cwo.googlegroups.com...
>I guess that kind of depends how non-1/f the noise model is. You should
> also find a link to the following paper
>
> N. J. Kasdin, "Discrete Simulation of Colored Noise and Stochastic
> Processes and 1/f^a Power Law Noise Generation," Proceedings of
> the IEEE, May, 1995.
>
> It is a nice read. If you still have questions after that, come back
> here.
>
> Regards,
> Andor
>