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o l m i e @ n i s t . gov Absrrorr-In this paper, we investigate the use of Adaptive Frequency Hopping (AFH) techniques aimed at malifying the Bluetooth frequency hopping sequence in the presence of WLAN direct sequence spread s p trum devices. We examine the conditions E"& as the applicntions, topolog i m and scenarios under which AFH techniques improve performance that is mearuied in terms of packet 10s. T C P delay, and channel efficiency. We also compare the resulu Obtained with AFH lo others obtained using a scheduling technique that eomist in delaying the transmission of a Bluet w t h packet until the medium is "idl?'. Our results show that an obvious performance impmvement With AFH is in terms of delay and throughput.AFH brings the delay down to the Same level than when no interference is pregent. On the other hand, AFH is raUler slow in responding to changes in tho envimnment and the packet loss i s mere significant than with the scheduling. This is probably due lo the limitations imposed by the communication overhead. The main difficulty for AFH is having to dynamically communicate the changes to all slaves in the piconet in order to keep the synchronization.

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