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Re: [Discuss-gnuradio] Problem faced with clock_recovery_mm at low data

From: Nemanja Savic
Subject: Re: [Discuss-gnuradio] Problem faced with clock_recovery_mm at low data rates
Date: Thu, 1 Aug 2013 12:36:11 +0200

I am also interested in this topic, since I was unable to configure MM bloxk once. In fact it was working for 26 samples per symbol but for 5 not. Could you provide some more information?

On Thu, Aug 1, 2013 at 9:11 AM, Waqas Bin Abbas <address@hidden> wrote:
Thanks Tom and Adeel for the suggestion.

We have sorted out the problem and now our system is working at low data

The real problem was with our *high pass filter* block. We are using it to
eliminate the DC-shift present at the output of quad_demod block. But its
not working at low data rates (As the frequency of the received symbols
decreases with the decrease in the data rate).  So now we have replaced the
high pass filter with a simple subtractor to eliminate dc-shift.

For synchronization we using same clock_recovery_mm and its working fine for
large samples per symbols (we have tried till 9600 samples/symbol).


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