An Adaptive Frequency Hopping Method in the Bluetooth Baseband

In Bluetooth version 1.0, the frequency to be shared has been resolved by the specific part of the digits of the Device clock and the Bluetooth address in the given piconet. Basic pattern was a kind of pseudo-random fashion using 79 frequencies in the ISM band. At this point, a problem might occur if there were more than two devices using the same frequency within the shared range. In this paper, we proposed a software-based adaptive frequency hopping method so that more than two wireless devices can stay connected without frequency collision. Suggested method was implemented with HDL (Hardware Description Language) and automatically synthesized and laid out. The adaptive frequency hopping circuit was implemented in a prototype and showed its operation at 24mHz correctly.