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Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink |
Date: |
Fri, 17 Jul 2015 13:19:44 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 17.07.2015 12:43, Bill Eaton wrote:
> From Martin Braun:
>
>>My preference is to build the demod/sync chain with it's own blocks, and then
>>just output the complex symbols
>
>> into either an X/Y plot (WX) or the QT Constellation Sink
>
> Even an X/Y plot ends up looking funny. I’ve attached a GRC file for
> X-Y, and when you turn on persistence, it looks better. But it’s very
> strange. Maybe my bits_per_symbol is wrong. Or maybe the sample rate for
> the X-Y chart should be different than the random sample rate? Here’s
> the 4 QAM X-Y.
Your plot looks fine, it's just oversampled (but perfectly
time-synchronized, I'm guessing this is post-pulse shaping + noise?).
What I meant was that you plot the result of your timing + phase
recovery into an XY plot, that would take care of those additional
points you're seeing.
M
- [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Bill Eaton, 2015/07/16
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Neel Pandeya, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Bill Eaton, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Bill Eaton, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink,
Martin Braun <=
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Bill Eaton, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Martin Braun, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Bill Eaton, 2015/07/17
- Re: [Discuss-gnuradio] trouble with QAM mod/ WX GUI Constellation Sink, Martin Braun, 2015/07/19