From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Hacker Date: Fri, 20 May 2011 11:54:10 +0600 Subject: [ath9k-devel] More on signal and noise In-Reply-To: References: <20110503111016.GA23612@infinet.ru> <20110520042016.GA24592@infinet.ru> Message-ID: <20110520055410.GA25117@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 Fri, May 20, 2011 at 12:46:12PM +0800, Adrian Chadd wrote: > > 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. > > Well, if the noise is constant, and RSSI is "relative" signal strength > indicator, why wouldn't it? It is depending on what the RSSI acronym means. :) I'd accustomed that it means Receive Signal Strength Indicator. The madwifi (if I don't miss) never gives an absolute RSSI so havn't such problems. Contrary in ath9k RSSI is absolute power of signal on receiver antenna input which by definition can not depend on noise floor. But due to noise floor measurement method used in baseband it does. > Adrian Best wishes, Alex.