[Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 57, Issue 55

[Achilleas Anastasopoulos]

Firt of all, I think that the chances that you'll find a cell
phone running an fm demodulator for GMSK demodulation are very slim,
and if they do use it, shame on them ;-)

It is the worst way to demodulate a GMSK signal in a GSM environment...

Achilleas

> > On 8/23/07, Jeffrey Karrels <address@hidden> wrote:
> >
> > > Hello all
> > >
> > > i am looking at gmsk again. i had two questions come up.
> > >
> > > 1) does clock recovery normally take place after fm demod?
> >
> > Sure.
>
>
> Let me reword that, what is the benefit of doing fm demod then clock
> recovery versus clock recovery then fm demod.
>
>
>
> > > 2) what clock recovery algo would one normally find in a receiver like
> > > a GSM receiver?
> >
> > M&M, Gardner, wired clocks... You're going to have to be more specific here.
>
>
> the GMSK block uses M&M. Let's take a standard cell phone as example.
> What are the chances if I had the DSP code of cell phone that I would
> find M&M in there. Is Gardner any better? et cetera...
>
> Does any of that make any sense or am I off in the woods somewhere?