Hi,
the last few days i've been experimenting with ath5k and its behaviour
under interference (through a jammer in a neighbour channel).
I used a sender and a reveiver in IEEE 802.11a and in adhoc mode. I
collected SNR measurements in the receiver node. Whenever jammer was on,
SNR dropped at the receiver.
I then used airmagnet to monitor the signal strength of the sender.
Suprisingly i noticed that the tranmission power of the sender drops
frequently when jammer was on; therefore SNR at the receiver dropped
because the signal of the sender dropped and not because
noise was increased.
Then i connected the sender and the receiver through an airlive AP. I
monitored the SNR at the receiver, capturing airlive's packets only. No
SNR drops when jammer was on.
So i conlcude:
1) Ath5k's transmission power for some reason drops when interference is
present.
2) SNR does not drop in the presence of interference (when an AP with a
stable transmission power is used), meaning that the noise measured does
not include interference.
Any comments are welcome.
Alex
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