GMSK pulse shaping

Hi there.

I am currently persuing a Msc Eng degree from the university of
Natal,Durban, South Africa. Recently I have been working on a system of
which the simulation results are given for the Edge standard. The author
of this paper however specifies that the 8psk modulation is infact used
for the results. He does however add that the channel is that of a typical
urban (TU) channnel with linearized GMSK pulse shaping. It is a rayleigh
fading frequency selective channel. The part that is troubling me is how
the GMSK pulse shaping used to generate the channel. If you have any code
(matlab or c) for GMSK specifically, it would really help. Thank you for
your time. 

Regards 

Jerry G. Mathew
Student Member IEEE
Research Centre for Radio Access Technologies
University of KwaZulu-Natal, Durban
School of Electrical, Electronic and Computer Engineering
5th floor
Room: CAD 5
South Africa

Contact details
e-mail : mathew@ukzn.ac.za 
Work:	+27-31-260-2736	
Cell:	+27-721251247



		
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"mathew" <mathew@ukzn.ac.za> wrote in message
news:s-qdnZjOvef_qfHfRVn-3w@giganews.com...
> Hi there.
>
> I am currently persuing a Msc Eng degree from the university of
> Natal,Durban, South Africa. Recently I have been working on a system of
> which the simulation results are given for the Edge standard. The author
> of this paper however specifies that the 8psk modulation is infact used
> for the results. He does however add that the channel is that of a typical
> urban (TU) channnel with linearized GMSK pulse shaping. It is a rayleigh
> fading frequency selective channel. The part that is troubling me is how
> the GMSK pulse shaping used to generate the channel. If you have any code
> (matlab or c) for GMSK specifically, it would really help. Thank you for
> your time.
>
> Regards
>
> Jerry G. Mathew
> Student Member IEEE
> Research Centre for Radio Access Technologies
> University of KwaZulu-Natal, Durban
> School of Electrical, Electronic and Computer Engineering
> 5th floor
> Room: CAD 5
> South Africa
>
> Contact details
> e-mail : mathew@ukzn.ac.za
> Work: +27-31-260-2736
> Cell: +27-721251247
>
>
>
>
> This message was sent using the Comp.DSP web interface on
> www.DSPRelated.com

Jerry

Good luck with your MSc. I used to work in Durbs, alongside someone else who
was doing his MSc through Natal Varsity. Anyway....

How about just writing your own - GMSK (in a GSM sense) can easily be found
in the GSM recommendation 05.04, available at www.3gpp.org (for free too!).
Only a few equations I'm sure you can massage into your Matlab simulation.

Rich

 Jerry-
The link below would show you the process of Gaussian pulse shaping.
http://www.emc.york.ac.uk/reports/linkpcp/appD.pdf
I used this document to simulate the GMSK modulation scheme just for
better understanding of the concept (CPM modulations in general and
GMSK in particular), when I was in school. The shortcut would be to use
the gaussfir function in MATLAB I guess. I did not use that as I did
not know about it before:)

Good luck

Regards
Nithin