From: Alex Hacker <hacker@epn.ru>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] More on signal and noise
Date: Fri, 6 May 2011 10:06:07 +0600 [thread overview]
Message-ID: <20110506040607.GA22055@infinet.ru> (raw)
In-Reply-To: <4DC353A9.3050801@gmail.com>
Yes, the AR5416 and so on chips uses the same Athersos CMOS technology and
same principle of RSSI/noise measurements.
The noise calibration is the process of periodic measuring minimum received
power in channel, averaging it and writing back to HW. This averaged value is
then used by HW to calculate SNR (rs_rssi). This valie analogues to AR92xx
measured in dB to unknown (temperature dependent) reference, not mW.
The fact that NF value on ath5k chips is near the real dBm noise level should
not lead to conclude that it is the same, it is incorrect.
Have a nice day!
next prev parent reply other threads:[~2011-05-06 4:06 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-02 21:46 [ath9k-devel] More on signal and noise Eduard GV
2011-05-03 11:10 ` 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 [this message]
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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