Jamming canceler using interpolated FFT

Abstract

The authors propose a new jamming cancellation system that uses the IpFFT (interpolated FFT) algorithm, involving simple calculations beyond the usual FFT. In this system, IpFFT is used to estimate the parameters of the jamming signal, frequency, amplitude, and phase, and the cancellation is performed in the time domain. In order for the IpFFT to perform correctly, accurate frequency-domain information about the jamming signal is required. However, FFT information around the jamming frequency may be warped by the information signal itself, which makes it difficult to estimate the parameters of the jamming signal. To remove the effect of the information signal on the jamming signal, various methods are proposed. The performance of the proposed system is verified by computer simulation, which demonstrates the high performance of the system. A comparison with the conventional frequency domain filter shows that the proposed system has an 8-10-dB better jamming cancellation capability than the FFT canceler.<>