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[Discuss-gnuradio] digital.dbpsk_demod Freq/Time/Phase Correction Issue

From: Kyeong Su Shin
Subject: [Discuss-gnuradio] digital.dbpsk_demod Freq/Time/Phase Correction Issue - What Should I Do?
Date: Mon, 20 Feb 2017 20:19:39 -0800

Hello everyone:

I am currently trying to fix an old GNURadio Python script which uses digital.dbpsk_demod, but having a trouble with the frequency / timing / phase correction loop bandwidth parameters.  When I set them to non-zero values (5/1000 ~ 6.28/100) , and start the transmitter a few seconds AFTER  the receiver, the receiver fails to correctly demodulate the incoming data. It does not happen if I start the transmitter before starting the receiver. 

What am I doing wrong here, and what should I do to fix the problem?

UHD Source --> DBPSK Demod --> digital.demod_pkts --> File Sink

Declaration (RX):
self.demodulator = digital.dbpsk_demod(samples_per_symbol=4,excess_bw=0.35,freq_bw=1e-3,phase_bw=1e-3,timing_bw=1e-3,mod_code="gray",verbose=False,log=False)

Declaration (TX):
self.modulator = digital.dbpsk_mod(samples_per_symbol=4,excess_bw=0.35,mod_code="gray",verbose=False,log=False)

Kyeong Su Shin

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