使用OTFS的雷达传感：采用ISI和ICI以克服模糊障碍
Radar Sensing with OTFS: Embracing ISI and ICI to Surpass the Ambiguity Barrier
摘要：
正交时频空间（OTFS）是在超过5G的高移动性通信中正交频分复用（OFDM）的有前途的替代方案。在本文中，我们考虑了OTFS联合雷达通信波形的雷达感知问题，并推导出一种新的OTFS雷达信号模型，明确考虑到符号间干扰（ISI）和载波间干扰（ICI）的影响。在新模型的基础上，我们展示了如何ISI和ICI现象可以变成一个优势，超过最大的明确的检测范围和速度的限制，在现有的OFDM和OTFS雷达系统。此外，我们设计了一个广义似然比测试为基础的检测器/估计器，可以拥抱ISI和ICI的影响。仿真结果表明，拥抱ISI/ICI的潜力，并证明其优越的检测和估计性能比传统的基线。
英文摘要：
Orthogonal time frequency space (OTFS) is a promising alternative to orthogonal frequency division multiplexing (OFDM) in high-mobility beyond 5G communications. In this paper, we consider the problem of radar sensing with OTFS joint radar-communications waveform and derive a novel OTFS radar signal model by explicitly taking into account the intersymbol interference (ISI) and inter-carrier interference (ICI) effects. On the basis of the new model, we show how ISI and ICI phenomena can be turned into an advantage to surpass the maximum unambiguous detection limits in range and velocity, arising in existing OFDM and OTFS radar systems. Moreover, we design a generalized likelihood ratio test based detector/estimator that can embrace ISI and ICI effects. Simulation results illustrate the potential of embracing ISI/ICI and demonstrate its superior detection and estimation performance over conventional baselines.
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