Frequency-domain anti-jamming (FDAJ) algorithms achieve prominent performance on interference suppression with simple calculations; and hence they are widely used in many applications. The interference suppression threshold plays a key role in the algorithm and affects system performance greatly. In this paper, the initial interference threshold is derived theoretically and then a novel FDAJ algorithm is proposed based on the iterative calculation of the threshold. With the iterative process,

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... e optimal threshold for the interference suppression can be approached with little loss of valid signals; and the antijamming performance can be further improved. The simulation results validate well that our proposed iterative algorithm has superior performance for interference suppression. Finally, two FPGA-based implementations are presented: pipeline scheme and iterative scheme. After analysing the different characteristics of each implementation, we discuss the suitable applications for these schemes.