G4GUO May 15, 2018 at 3:00 pm
- This topic was modified 1 week ago by G4GUO.
Is there a way of displaying the MER (in dB) value as well as
the EVM value when doing modulation analysis using Spike?
If not could it be added in a later version of the software.
It should be a relatively easy thing to do.
AndrewModeratorAndrew May 15, 2018 at 3:33 pm
There is not currently a way to display this number. To clarify as well, MER(dB) == SNR(dB) ?
You can find an equation for the EVM(%) -> SNR(dB) conversion here.
I can look into adding this for a future release of Spike. I look forward to your response.
G4GUOParticipantG4GUO May 16, 2018 at 12:57 am
I have been doing the calculations manually. I am
working on DVB and they seem to use MER rather than
EVM. I am only interested in QPSK and 8PSK as the
other constellations are not supported by Spike.
In my own receiver software I use
calculating the RMS error and signal vectors from the
samples. Example here http://g4guo.blogspot.co.uk/
I hope you are able to add it as it would help me.
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