In orthogonal time frequency space (OTFS) modulation, information-carrying symbols reside in the delay-Doppler (DD) domain. By operating in the DD domain, an appealing property for communication arises: time-frequency (TF) dispersive channels encountered in high mobility environments become time-invariant. The time-invariance of the channel in the DD domain enables efficient equalizers for time-frequency dispersive channels. In this paper, we propose an OTFS system based on the discrete Zak transform. The presented formulation not only allows an efficient implementation of OTFS but also simplifies the derivation and analysis of the input-output relation of TF dispersive channel in the DD domain.

翻译：在正方位时频空间( OTFS) 调制, 信息携带符号位于延迟- Doppler (DD) 域内。 通过在 DD 域内操作, 产生了一个吸引通信的属性: 在高流动性环境中遇到的时间- 频率(TF) 分散的频道成为时间变化性。 DD 域内频道的时间变化使得时间- 频率分散的频道能够实现高效的平衡。 在本文中, 我们提议基于离散 Zak 变换的 OTFS 系统。 提供的配方不仅允许高效实施 OTFS, 还简化了 DD 域内 TF 分散通道输入- 输出关系的衍生和分析 。