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From: | George Edwards |
Subject: | Re: Combined constellation modulator/Decoder do not seem to work |
Date: | Fri, 12 Mar 2021 15:46:22 -0600 |
I can't make out details in your image, George, but attach one I made
when working through the tutorial and works just now under gnuradio
3.8.1.0. Like someone else mentioned in another reply, I found the
delay to be 58 and set it as the default in the attached flowgraph.
Zoom in on the bit stream plot and allow a second or two after changing
delay to see the effect.
Hope this helps,
Mike Markowski
On 3/12/21 10:37 AM, George Edwards wrote:
> Hello,
>
> I cannot get the combined Constellation Modulator/Decoder as shown below
> to work. The figure below is an example from the online Guided Tutorial
> PSK Demodulation.... I leave out the Equalizer, Costas Loop blocks, the
> channel was set to pass the signal unimpaired and the Poly Clock Sync
> was set for Output sps=1. The constellation plot of the output of the
> Poly Clock Sync is perfect. Now, in the flowgraph below, the signal
> entering the Constellation Modulator and that leaving the Constellation
> Decoder are routed into Time Sinks for display. I route these signals
> into File Sinks so I can print them and compare 1's and 0's. The results
> show they are not the same. I passed Constellation Rect.Object
> parameters to both the Constellation Modulator and Decoder, which seems
> logical to me, but I could be wrong???
> Will appreciate any help you can provide because what enters the
> modulator should be the same as what is leaving the demodulator.
> Regards,
> George
>
> image.png
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