From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Hacker Date: Fri, 20 May 2011 10:20:16 +0600 Subject: [ath9k-devel] More on signal and noise In-Reply-To: References: <20110503111016.GA23612@infinet.ru> Message-ID: <20110520042016.GA24592@infinet.ru> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org On Tue, May 17, 2011 at 05:04:49PM -0700, Eduard GV wrote: > Understood, big thank you. > > However, the noise floor shouldn't take only thermal noise into > account. Man-made noise could raise the noise floor more than 6dB in > the congested 2.4GHz band (in the 5GHz band it should be lower). Yes, in Atheros' scheme it raise the NF and lowers RSSI values same manner. External noise shouldn't affect absolute RSSI level but it does. > By the way, I join the popular demand for having access to CSI data! By muself I don't believe what BF can sufficiently advance link quality. TxBF is implemented in AR9390 chip, but with only 3 antennas it can raise RSSI by less then 4.5dB, this is not a revolution.