Hi all,
Just three questions. I need per-packet SNR information and my first
guess was to inspect "last_signal" from debugfs. Values range from -30
to -60. last_signal file should contain signal (dBm) of last received
frame (from sta_info.h), right? That explains values obtained. But...
1) This v
hi,
I am facing problem where rs_rssi becomes less for 2.4Ghz band.
Other chips beside hear it correctly.
What can be possible problem.
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Look at what the NF calibration values are doing over time. rs_rssi is
calculated agains tthe noise floor, it's not an absolute signal level.
-a
On 10 January 2014 02:00, syed wrote:
> hi,
> I am facing problem where rs_rssi becomes less for 2.4Ghz band.
>
> Other chips beside hear it correctl
On Mon, May 02, 2011 at 02:46:06PM -0700, Eduard GV wrote:
> Hi all,
>
> Just three questions. I need per-packet SNR information and my first
> guess was to inspect "last_signal" from debugfs. Values range from -30
> to -60. last_signal file should contain signal (dBm) of last received
> frame (fr
Does this CMOS assumption apply to ath5k as well?
I thought ath5k has noise recalibration which tune the noise floor
accordingly (which seems to be true from our experiments). In madwifi
the noise floor is fixed at -95 or -96, but the ath5k introduces the ani
and noise recalibration.
But the r
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 calcula
On Fri, May 06, 2011 at 10:06:07AM +0600, Alex Hacker wrote:
> Yes, the AR5416 and so on chips uses the same Athersos CMOS technology and
> same principle of RSSI/noise measurements.
Sorry, I mean AR52xx/AR5413 chips.
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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 calcula
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).
By the way, I join the popular demand for having access to CSI data!
>
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,
On 20 May 2011 12:20, Alex Hacker wrote:
> 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
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,
Hi,
What I've learned so far from this thread is that rs_rssi (struct
ath_rx_status) is actually an SNR (not an RSSI), in dB.
What's not yet clear to me is how is this value obtained. My guess
from Alex's explanation is that it is the result of subtracting the
gain of the AGC during a short period
On Thu, Jun 9, 2011 at 3:46 PM, Eduard GV wrote:
> Hi,
>
> What I've learned so far from this thread is that rs_rssi (struct
> ath_rx_status) is actually an SNR (not an RSSI), in dB.
RSSI has no clear definition. An SNR is a perfectly valid form of RSSI.
> If SNR is computed during packet's prea
Hello!
I notice that the "sample" in "/sys/kernel/debug/ieee80211/phy0/ath9k" report
'ChNoise Chain privNF #Reading Readings' and 'rssi:- ctl0 ctl1 ctl2 ext0 ext1
ext2' at the same time. Anybody can tell me what's the difference and Atheros
calculate the rssi in ath9k?
Thanks!
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