A robust interference mitigation technique for BFSK Fast Frequency Hopped signals

This paper presents an improvement to the Frequency Shift Keying - Fast Frequency Hopping demodulator, which provides increased resilience to interference with a very slight complexity increase. The additional robustness against jamming is achieved by jointly observing the FSK demodulator branches. This allows the proposed demodulator to distinguish the jammer from the signal more accurately. This demodulator is particularly robust for the case of high J/S (Jammer to Signal Ratio), while for the case of low J/S its performance is in line with state-of-the-art receivers.