Digital Communications : Modulation Recognition and frequency spectrum

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4 total messages Started by John Wed, 13 Mar 2002 14:51

#2501

Author: John
Date: Wed, 13 Mar 2002 14:51

6 lines
1459 bytes

Hi,
I am looking for a practical approach of modulation recognition of a
signal using its frequency spectrum. I need a practical approach but
any help in theoretical areas will be welcomed too.
Bests,
John

Re: Digital Communications : Modulation Recognition and frequency spectrum

#2502

Author: Markus L
Date: Wed, 13 Mar 2002 15:26

18 lines
2030 bytes

Get the sound samples of all common digi modes from
http://www.geocities.com/CapeCanaveral/Cockpit/2800/digital/
and convert them into spectra using any FFT software!

73, Markus HB9BRJ
--
e-mail address is ROT13 encoded. Decode before replying.


"John" <john_james@email.com> wrote in message
news:237340ff.0203130651.245799d9@posting.google.com...
> Hi,
> I am looking for a practical approach of modulation recognition of a
> signal using its frequency spectrum. I need a practical approach but
> any help in theoretical areas will be welcomed too.
> Bests,
> John
>

Re: Digital Communications : Modulation Recognition and frequency spectrum

#2503

Author: Jitendra Rayala
Date: Wed, 13 Mar 2002 21:45

20 lines
2065 bytes

john_james@email.com (John) wrote in message news:<237340ff.0203130651.245799d9@posting.google.com>...
> Hi,
> I am looking for a practical approach of modulation recognition of a
> signal using its frequency spectrum. I need a practical approach but
> any help in theoretical areas will be welcomed too.
> Bests,
> John

John, 

If you are not too particular about algorithms based only on frequency
spectrum, the following paper has a couple of algorithms using neural
networks. The same authors also have a book on the subject (See the
references). Hope this helps..

A. K. Nandi and E. E. Azzouz, "Algorithms for Automatic Modulation
Recognition of Communication Signals," IEEE Trans. on Communications,
vol 46, pp 431-436 April 1998.

Jitendra

Re: Digital Communications : Modulation Recognition and frequency spectrum

#2504

Author: John
Date: Sat, 16 Mar 2002 14:34

32 lines
2702 bytes

jrayala@hotmail.com (Jitendra Rayala) wrote in message news:<18a9fced.0203131345.3ca6f7cb@posting.google.com>...
> john_james@email.com (John) wrote in message news:<237340ff.0203130651.245799d9@posting.google.com>...
> > Hi,
> > I am looking for a practical approach of modulation recognition of a
> > signal using its frequency spectrum. I need a practical approach but
> > any help in theoretical areas will be welcomed too.
> > Bests,
> > John
> 
> John, 
> 
> If you are not too particular about algorithms based only on frequency
> spectrum, the following paper has a couple of algorithms using neural
> networks. The same authors also have a book on the subject (See the
> references). Hope this helps..
> 
> A. K. Nandi and E. E. Azzouz, "Algorithms for Automatic Modulation
> Recognition of Communication Signals," IEEE Trans. on Communications,
> vol 46, pp 431-436 April 1998.
> 
> Jitendra

Jitendra,

Thank you for your answer. I need just a practical approach, depending
on frequency or even time domain charactristics. It is not important
if it is automatic or not, but I need to discover the modulation type
of a given signal. At present I don't have access to the book but I
have the paper. Although I have not read it completely but I think it
is not so practical. Any way, thank you very much for your help.

John

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