An Energy Concentration Narrowband Interference Suppression Algorithm for OTFS Systems

Orthogonal Time Frequency Space (OTFS) modulation shows strong robustness in non-geostationary orbit (NGSO) satellite communications but is seriously impacted by narrowband interference (NBI). Thus, the energy concentration NBI suppression (ECNBIS) algorithm is proposed to remove the NBI. Particularly, translation matrices are first designed to concentrate the NBI energy by canceling out the phase shifts. Peak determination and cyclic zero setting are then used for interference detection and removal. Finally, the interference suppression framework is established with the Harris Hawk Optimization (HHO) algorithm. Simulation results show that the proposed algorithm requires a signal-to-noise ratio (SNR) reduction of more than 1 dB.