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Re: [Discuss-gnuradio] Distorted QPSK Constellation

From: Martin Braun
Subject: Re: [Discuss-gnuradio] Distorted QPSK Constellation
Date: Wed, 14 Jan 2015 08:51:49 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0

On 01/14/2015 04:56 AM, Salman Dinani wrote:
> 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.

My guess is yes, it's a normal plot, and you have no time sync in there.


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