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Open RadioML Synthetic Benchmark Dataset
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Noise Amplitude Calculation #10

Closed garverp closed 6 years ago

garverp commented 7 years ago

I think the noise amplitude calculation should be: 10^(-snr_db/20.0), but the code has: 10^(-snr_db/10.0)

It looks like all the transmitters scale to an average magnitude squared P_avg=1. Then SNR_lin = P_avg/sigma^2, so sigma^2 = 1/snr_lin = 1/(10^(-snr_db/10)) => sigma = sqrt(1/(10^(-snr_db/10))) = 10^(-snr_db/20). The dynamic channel model takes in the standard deviation not the variance.

What am I missing?

osh commented 6 years ago

In newer versions we clearly us Es/N0, this will be released soon

garverp commented 6 years ago

OK, but does that mean the results will change from previously published papers using this code?