Pulse shaping and modulation.

Hi all. I am starting out on signal processing. Conceptionally I think I
understand the advantages of pulse shaping and raised cosine. But I am not
clear where this is used in practice. Is pulse shaping just used on purely
digital transmission i.e. A pulse train. Or is it combined with digital to
analog modulation. E.g. QPSK. Any help would be much appreciated. 
Thanks in advance
Steve. 

	 

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On Fri, 20 Jun 2014 11:29:08 -0500, "D20gdx" <100621@dsprelated>
wrote:

>Hi all. I am starting out on signal processing. Conceptionally I think I
>understand the advantages of pulse shaping and raised cosine. But I am not
>clear where this is used in practice. Is pulse shaping just used on purely
>digital transmission i.e. A pulse train. Or is it combined with digital to
>analog modulation. E.g. QPSK. Any help would be much appreciated. 
>Thanks in advance
>Steve. 

I'm not sure what you mean by digital to analog modulation, but QPSK
is very commonly used, as are BPSK, 8PSK, and m-QAM, and all are
generally applied with pulse shaping, usually with
Square-Root-Raised-Cosine filters in both the modulator and
demodulator.


Eric Jacobsen
Anchor Hill Communications
http://www.anchorhill.com