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Re: [Discuss-gnuradio] Distorted QPSK Constellation

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] Distorted QPSK Constellation
Date: Thu, 15 Jan 2015 14:13:43 -0500

On Thu, Jan 15, 2015 at 1:41 PM, Salman Dinani <address@hidden> wrote:
> Hi to all,
> Thanks very much to all of you for your valuable suggestions.In accordance
> with your suggestions, I experimented with my designed DQPSK system and got
> few problems which I am listing down.All the referenced figures are
> attached.
> I reduced the symbol per sample to 4 (previously it was 8) and added a RRC
> filter before constellation plot (figure RRC_const) but constellation
> remains the same L

You gave 0 taps to your RRC filter?  Why would you do that?  I'm not
sure what that would do.

At one exact phase you'll get the points when your system is setup
correctly.  The other phases will get ISI.


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