Gaurav

quoted text
> Can you please help me with the idea about how the transmitter can 
> overcome a jammed state and start communicating with the Destination 
> again.
It depends on which kind of jamming you are experiencing: intermittent 
or continuous, wideband or narrowband? An obvious technique is to change 
the modulation type: switch from b to g or vise versa and/or change the 
tx rate (this changes the modulation technique under 11b - although rate 
control will tend to react against deliberate jamming as it does to a 
high SNR). These modulation schemes respond differently in the presence 
of different kinds of jammers. There are published papers which describe 
the strengths and weaknesses of OFDM versus DSSS and FHSS when jammed by 
different kinds of signal.

quoted text
> one idea that comes to my mind is to change the freq. and let the 
> destination also know about it. But how?
> I need some help with more ideas and how to implement them.

Each station needs to figure out for itself that the network is under 
attack and use your channel agility approach under control of some 
function. Be warned that changing channels on ath5k hardware is quite a 
slow operation (taking about 25ms or so). Might be best to leave 
frequency agility to the PHY layer.

Please note this is an ath5k developers mailing list and you should keep 
your posts on-topic. General questions such as yours belong on other lists.

Steve
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