Gaurav > 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.
> 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 _______________________________________________ ath5k-devel mailing list [email protected] https://lists.ath5k.org/mailman/listinfo/ath5k-devel
