[ath9k-devel] spectral scan

Hi All,
I am a newbie of Atheros WiFi chipsets and I am trying to use the spectral
scan feature available on AR9280.
It's working fine, but I would understand in details the type of data
returned from che chipset.
In particular, I would know if the FFT data are related to the received
signal (let me denote with Y) or to the channel estimation (let me denote
with H), also known as CSI.
My doubt arises from the fact that spectral scan does not require to be
connected to any APs to work.

Thanks in advance for any help and suggestions.
BR,

Simone
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