Design and implementation of Frequency Hopping Spread Spectrum (FHSS) system using FPGA

Frequency hopping techniques are used in CDMA communication systems, where several hopping frequencies are allocated for each user within a specific frequency range for all users.The number of frequencies within a certain frequency range is fixed so that the interference noise is reduced.The frequency hopping algorithm for these frequencies varies from one user to another.In this paper, we propose a practical method for a frequency hopping system using a programmable hopping algorithm stored in ROM for the case of slow FHSS and fast FHSS, and for three users and eight frequencies , this system is designed using a cyclone II EP2C20F484C7 FPGA from ALTERA placed on education and development board DE-1 with the following parameters: -Clock frequency: FCLK=50MHz -Modulation type of signal is : 2FSK.-Frequency range: (0.011 Hz…10 MHz) .-Frequency Resolution: (0.011 Hz).-Signal amplitude (5V).-Controlled parameters: values of hopping frequency