#705: Atheros Sensitivity
---------------------------------+------------------------------------------
Reporter: [EMAIL PROTECTED] | Owner:
Type: defect | Status: reopened
Priority: major | Milestone: version 1.0.0 - first stable
release
Component: madwifi: HAL | Version: trunk
Resolution: | Keywords:
Patch_attached: 0 |
---------------------------------+------------------------------------------
Comment (by [EMAIL PROTECTED]):
We have investigated the ANI problem described in this ticket more
thoroughly. The test where executed under release-0.9.4, which uses hal
version 0.9.18.0.
As previously mentioned in on the mailinglist (1), turning ANI off gives
at least performance issues in urban environments.
We saw that the ANI algorithm consist of different steps, setting
different registers to adapt noise immunity. Among them are (2):
* OFDM weak signal detection
* Noise immunity level
* Spur immunity level
* CCK weak signal detection
* Fir step level
These can also be found in the hal extensions (r3495), added by mtaylor
and the changeset r3505 which disables ANI in the current trunk (HAL
version 0.9.30.13).
Our conclusion after extensive testing and experimenting is that the ANI
algorithm in the HAL (0.9.18.0) is actually working, except that the OFDM
weak signal detection parameter is not initialised properly after a radio
reset.
A patch for the sources is made with a fix that forces the hopefully
correct OFDM weak signal setting into the HAL after each reset. The
sensitivity is initial high, but will be adapted according to the
environment. This is different compared to the previous fix where ANI was
disabled totally.
A new patch is added to this ticket for madwifi release-0.9.4
(ani_sensitivity_fix_v2.diff). We hope this patch will be tested in
different environments, and hope to receive feedback on the results.
References:
* (1) Ani thread madwifi: gmane.linux.drivers.madwifi.devel/5557
* (2) Ani thread ath5k: gmane.linux.drivers.ath5k.devel/340
Signed-off-by: Michel Lammertink <[EMAIL PROTECTED]> Twente Institute
of Wireless and Mobile Communications
--
Ticket URL: <http://madwifi.org/ticket/705#comment:34>
madwifi.org <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference
Don't miss this year's exciting event. There's still time to save $100.
Use priority code J8TL2D2.
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
_______________________________________________
Madwifi-tickets mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/madwifi-tickets
