From mboxrd@z Thu Jan 1 00:00:00 1970 From: Till Wollenberg Date: Fri, 26 Jun 2015 15:13:00 +0200 Subject: [ath9k-devel] Raditotap overall RSSI vs per chain RSSI In-Reply-To: References: Message-ID: <558D4FDC.20503@uni-rostock.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org Hi Brandon! * On 22.06.2015 at 18:39 Brandon Enochs wrote: > Can anyone explain how the overall RSSI is calculated versus the per chain > RSSI? Sometimes, it seems to be the maximum of the per chain RSSI and other > times it's none of them. I'm not an expert in these things, but to me it looks like the "overall RSSI" is just the (logarithmised) sum of the per-chain RSSIs. Here is an example taken from a frame received by a two chain system: Total SSI: -63 dBm "Antenna 0": -67 dBm "Antenna 1": -66 dBm 10 * log10( 10^(-6,7) + 10^(-6,6) ) = -63.46 Best regards Till