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

From: Waqas Bin Abbas
Subject: Re: [Discuss-gnuradio] Problem faced with clock_recovery_mm at low data rates
Date: Thu, 1 Aug 2013 00:11:19 -0700 (PDT)

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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