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Re: Combined constellation modulator/Decoder do not seem to work
From: |
Mike Markowski |
Subject: |
Re: Combined constellation modulator/Decoder do not seem to work |
Date: |
Fri, 12 Mar 2021 16:29:49 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 |
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
mpsk_stage6.grc
Description: application/gnuradio-grc