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Thread-Topic: noise level measurement with Atheros driver 
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From: "Lang, Tanja" <tlang@csu.edu.au>
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Subject: noise level measurement with Atheros driver 
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Hi,

=20

  I would like to record signal strength and noise level for each client
packet received on a wireless access point. I found the fields
IEEE80211_RADIOTAP_DBM_ANTSIGNAL and     IEEE80211_RADIOTAP_DBM_ANTNOISE
in the radiotap header which should give me this information.=20

=20

The 'wi' interface sets both of these values in if_wi.c=20

if_wi.c:                sc->sc_rx_th.wr_antnoise =3D =
frmhdr.wi_rx_silence;

if_wi.c:                sc->sc_rx_th.wr_antsignal =3D =
frmhdr.wi_rx_signal;

=20

While the 'ath' interface only provides signal strength information.

if_ath.c             sc->sc_rx_th.wr_antsignal =3D =
ds->ds_rxstat.rs_rssi;

=20

Is the Atheros driver (which my current wireless card in the AP uses)
capable of providing noise information? If yes, which line needs to be
added in if_ath.c?

=20

Thanks,

Tanja

=20