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HI.

Can you please help me with the idea about how the transmitter can overcome

a jammed state and start communicating with the Destination again.

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.

Thank you
--

Warm regards,

Gaurav Joshi

Ph:+1-352-214-2527
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HI. <br>Can you please help me with the idea about how the transmitter can overcome a jammed state and start communicating with the Destination again.<br>one idea that comes to my mind is to change the freq. and let the destination also know about it. But how?<br>

I need some help with more ideas and how to implement them.<br>Thank you<br clear="all"><br>-- <br>Warm regards,<br>Gaurav Joshi<br>Ph:+1-352-214-2527
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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 
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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