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PSK-Demodulation

From: Till Hülder
Subject: PSK-Demodulation
Date: Sun, 16 Feb 2020 18:50:07 +0100
Hello,
 
i send frequency chrip signal with an usrp over a phaseshifter and modulat with that an 2-PSK the signal, recieve the modulated signal in the same usrp and anlayse it.
The change phaseshifter alternately hange between 0° and 180°. But i don't get accurate results after demodulation. I attached my graph , time diagramm and constallation diagramm (on top the RX and bottom TX).
 
Can someone help me ?
Best regards,
Till
 
 

Attachment: Aufbau_gnuradio.png
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Attachment: time_diag_mod_chirp.png
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Attachment: Zusammenfallendes_const_dia.png
Description: PNG image

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