On Extremely Low-Complexity Detection for OTFS via Interference Cancellation

In this paper, we focus on orthogonal time frequency space (OTFS) modulated transmissions over doubly-selective channels. Specifically, we investigate the state-of-the-art techniques for effective detection in high-mobility scenarios and introduce an innovative strategy that is based on the Ungerboeck observation model and leverages the principle of interference cancellation. The key advantage of the proposed method lies in its extremely low computational complexity. We evaluated the performance of this algorithm in terms of both pragmatic capacity and bit error rate, comparing it with existing state-of-the-art solutions. Simulation results demonstrate that the proposed approach allows to achieve an optimal trade-off between complexity and performance under various channel conditions.