System Based On Frequency Hopping Of Bluetooth Kernel

Bluetooth technology is an open specification for low-cost short-range wireless communication and networking between PCs, mobile phones and other handheld devices. The Bluetooth radio system uses the unlicensed ISM band and applies Frequency-Hop Spread Spectrum techniques. Bluetooth applies a special hop selection mechanism and the sequence is selected by the unit identity and unit clock. So this system can be realized by combinatorial logic circuitry. Conventional pseudo-random generators like those based on Linear Feedback Shift Registers cannot be used. The sequence has a good performance in randomness and homogeneity.In this paper, my emphasis is the performance of the hop sequence and the realization of the hop system. The randomness, periods and homogeneity of the hop sequence have been analyzed. Simulations have been carried out in MATLAB. Next, I design the hardware system using SCM (Single Chip Micyoco) and DDS. The debugging and parameter evaluating have been carried out at one time. Thirdly, I do some modification of the hop system, using VHDL realize the hop selection mechanism. The SCM is also replaced by the FPGA. In this way, the speed of the hardware system is improved greatly. The simulation has been carried out in MAX+plus II. At last, the paper presents a scheme applying the technique of Adaptive Frequency Hopping (AFH) to Bluetooth system.