From: Siia Chen <oakpacific@gmail.com>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] Question regarding the ath9k spectral FFT bin data
Date: Thu, 22 Dec 2016 07:25:26 +0000 [thread overview]
Message-ID: <CAJHXcKEyieqabH+JnOTEEPnha0BpEZngp9LGKUjcrmadwNw5dw@mail.gmail.com> (raw)
Hello,
In https://wireless.wiki.kernel.org/en/users/drivers/ath9k/spectral_scan
and https://wiki.freebsd.org/dev/ath_hal%284%29/SpectralScan and a few
mails on this list I have seen it stated that the FFT data for each
bin is reported as the sum of the absolute magnitudes of both I and Q
components, i.e, |i|+|q|. However, I have also seen the square of the
returned bin value being directly plugged into the formula for
estimating the bin power in numerous post-processing applications,
which doesn't make sense for me. As power is calculated by i^2+q^2,
which doesn't equal to (|i|+|q|)^2. Can anybody kindly clear this up
for me? Thanks a lot.
Best wishes,
Robert
reply other threads:[~2016-12-22 7:25 UTC|newest]
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