This letter studies the mechanism of uplink multiple access and jamming suppression in an OTFS system. Specifically, we propose a novel resource hopping mechanism for orthogonal time frequency space (OTFS) systems with delay or Doppler partitioned sparse code multiple access (SCMA) to mitigate the effect of jamming in controlled multiuser uplink. We analyze the non-uniform impact of classic jamming signals such as narrowband interference (NBI) and periodic impulse noise (PIN) in delay-Doppler (DD) domain on OTFS systems. Leveraging turbo equalization, our proposed hopping method demonstrates consistent BER performance improvement under jamming over conventional OTFS-SCMA systems compared to static resource allocation schemes.

翻译：本文研究了OTFS系统中上行多址接入与抗干扰抑制机制。具体而言，针对采用时延或多普勒分区稀疏码多址接入（SCMA）的正交时频空间（OTFS）系统，我们提出了一种新型资源跳频机制，以减轻受控多用户上行链路中的干扰影响。我们分析了经典干扰信号（如窄带干扰（NBI）和周期性脉冲噪声（PIN））在时延-多普勒（DD）域中对OTFS系统的非均匀影响。通过利用Turbo均衡技术，与静态资源分配方案相比，我们提出的跳频方法在受干扰环境下相比传统OTFS-SCMA系统展现了持续的误码率性能改善。