From: Eduard GV <eduardgv@gmail.com>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] More on signal and noise
Date: Mon, 2 May 2011 14:46:06 -0700 [thread overview]
Message-ID: <BANLkTi=2u=Q6O6rvugMzh1mb4HNMDmGyow@mail.gmail.com> (raw)
Hi all,
Just three questions. I need per-packet SNR information and my first
guess was to inspect "last_signal" from debugfs. Values range from -30
to -60. last_signal file should contain signal (dBm) of last received
frame (from sta_info.h), right? That explains values obtained. But...
1) This value is computed as signal=ATH_DEFAULT_NOISE_FLOOR +
rx_stats->rs_rssi, which is confusing me. It would be explained if
rs_rssi is actually SNR (not RSSI) measured in dB. Am I wrong?
2) Why is NOISE_FLOOR fixed to -95 (dBm?). Noise varies randomly, e.g.
noise reported by iw survey dump vary from -91 to -101 dBm.
3) By the way, what do rs_rssi_ctlX and rs_rssi_extX (-1 < X < 3) measure?
Thank you!
next reply other threads:[~2011-05-02 21:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-02 21:46 Eduard GV [this message]
2011-05-03 11:10 ` [ath9k-devel] More on signal and noise Alex Hacker
2011-05-06 1:49 ` Peizhao Hu
2011-05-06 3:45 ` hacker at AShevkov.infinet.ru
2011-05-06 4:06 ` Alex Hacker
2011-05-06 4:41 ` Alex Hacker
2011-05-18 0:04 ` Eduard GV
2011-05-20 4:20 ` Alex Hacker
2011-05-20 4:46 ` Adrian Chadd
2011-05-20 5:54 ` Alex Hacker
2012-06-07 2:50 ` MaYongsen
2011-06-09 22:46 ` Eduard GV
2011-06-09 22:56 ` Daniel Halperin
2014-01-10 10:00 ` syed
2014-01-10 17:45 ` Adrian Chadd
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