Robust Channel Estimation Algorithm for OTFS Systems under Jamming Attacks

In this letter, we investigate an unexplored yet critical issue: channel estimation (CE) for orthogonal time frequency space (OTFS) under delay-Doppler (DD) domain jamming attacks. To address the challenge of CE under DD jamming attacks, we propose a robust, spectrally efficient, low-complexity, and fast-converging recursive Versoria-aware Champernowne function (VACF)-based adaptive CE algorithm. We derive the recursive channel estimate update equation of the proposed algorithm and present a detailed analysis of its computational complexity to demonstrate its applicability in practice. Along with the simulation results, we conducted an experiment employing software-defined radios to verify the resilience of the proposed algorithm in a real-time setting.