Well, the first thing that immediately springs to mind there is 11g == OFDM and CCK, but 11a == OFDM only. You may find the CCK stuff behaves differently in the presence of noise.
You could also try fiddling with ANI (is there ani in ath5k?) which has some parameters for controlling CCK sensitivity/threshold/trigger levels. HTH, Adrian On 3 March 2011 12:24, Alex <alfr...@gmail.com> wrote: > I'll try this thanks. > > Another thing i've noticed is that whenever Ath5k works in g mode, it > reports no PHY or CRC errors, although inteferer is running. > > This is not the case when the driver is in 802.11a mode. > > > Alex > > > > On 3/3/2011 9:59 μμ, Adrian Chadd wrote: > > Have you also added a hook or two to monitor what's going on to the noise > floor? > > IIRC, atheros radios report RSSI as an offset from the current NF; if the > NF raises but the signal doesn't, RSSI will "decrease". > > > > Adrian > > On 3 March 2011 11:50, Alex <alfr...@gmail.com> wrote: > >> Hi, >> >> i'd list to ask the members of this list regarding the value rs->rs_rssi >> ath5k reports in the ath5k_receive_frame function. >> >> I use a monitor node (its interface set to promiscuous mode) and i collect >> the rssi values (rs->rs_rssi) in a per packet basis (i' ve modified >> base.c). >> >> I use an interferer (this is an IEEE 802.11 compatible node working in >> adjacent channels) and i monitor the rssi of the packets sent by an access >> point . >> >> Whenever i work in IEEE 802.11a, i can see that RSSI (or SNR) drops when >> interferer is on. >> >> However, whenever i work in IEEE 802.11g there are no SNR drops, although >> the interferer succesfully jams the channel. >> >> I've repeated the experiments with ANI disablesd but still SNR does not >> drop in g. >> >> Any ideas? >> >> Thanks, >> >> Alex >> >> _______________________________________________ >> ath5k-devel mailing list >> ath5k-devel@lists.ath5k.org >> https://lists.ath5k.org/mailman/listinfo/ath5k-devel >> >> > >
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