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[Discuss-gnuradio] GNUradio DQPSK bit error rate

From: Haaris
Subject: [Discuss-gnuradio] GNUradio DQPSK bit error rate
Date: Sat, 5 Dec 2015 11:42:18 -0800

Almost a month ago i started working on a digital communications project
which involves GNUradio.
And I am severely struggling to get past some errors or mismatches I am
encountering in GNUradio.
I am desperately in need of some expert help.
I made a DQPSK modulator and demodulator using GRC. ( screenshots
provided )
Gave a vector source with bits 0,1,0,1 and repeat on, on the input of
psk modulator.
I also used an error rate block to calculate bit error rate.
Now almost everything that is appearing on the scopes is completely

The bit error rate is 0.5, provided that i have added no noise.(which is
max considering that we will recover 50 percent bits correctly just by
The scope at the psk modulator output shows four constellation points
even though i am transmitting only one symbol i.e (0,1).

What am i doing wrong?
Can someone please be kind enough to go through the screenshots and tell
me the mistake(s).
Any help will be greatly appreciated.
Thanks in advance.

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