* [ath9k-devel] Raditotap overall RSSI vs per chain RSSI
@ 2015-06-22 16:39 Brandon Enochs
2015-06-26 13:13 ` Till Wollenberg
0 siblings, 1 reply; 2+ messages in thread
From: Brandon Enochs @ 2015-06-22 16:39 UTC (permalink / raw)
To: ath9k-devel
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.
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* [ath9k-devel] Raditotap overall RSSI vs per chain RSSI
2015-06-22 16:39 [ath9k-devel] Raditotap overall RSSI vs per chain RSSI Brandon Enochs
@ 2015-06-26 13:13 ` Till Wollenberg
0 siblings, 0 replies; 2+ messages in thread
From: Till Wollenberg @ 2015-06-26 13:13 UTC (permalink / raw)
To: ath9k-devel
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
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2015-06-22 16:39 [ath9k-devel] Raditotap overall RSSI vs per chain RSSI Brandon Enochs
2015-06-26 13:13 ` Till Wollenberg
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