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[Discuss-gnuradio] Distorted QPSK Constellation

From: Salman Dinani
Subject: [Discuss-gnuradio] Distorted QPSK Constellation
Date: Wed, 14 Jan 2015 08:56:52 +0500

Hi to all,

I am a beginner in using GNU radio(GRC). I have made a DQPSK transmitter using the blocks of GNU radio (attached Figure QPSK_1). when I connected the constellation plot with it, It gave me the a very scattered Constellation Plot Instead of four Clean Constellation Dots (attached Figure QPSK_2). I have checked with all forms of signals but the constellation remains distorted.(i.e. vector source, signal source etc.)

Is it normal plot or am I missing some thing? Kindly help.

Salman Dinani

Attachment: QPSK_2.PNG
Description: PNG image

Attachment: QPSK_1.PNG
Description: PNG image

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