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

From: Achilleas Anastasopoulos
Subject: [Discuss-gnuradio] Re: Discuss-gnuradio Digest, Vol 57, Issue 55
Date: Mon, 27 Aug 2007 10:21:13 -0400
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)

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...


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?


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?

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