标题： 基于OTFS的高移动性V2X系统中的多天线接收方案 显示英文标题

标题： OTFS Based Receiver Scheme With Multi-Antennas in High-Mobility V2X Systems

摘要： 车辆到一切（V2X）被认为是未来无线通信网络最重要的应用之一。 然而，由于车辆移动性引起的多普勒效应可能会严重恶化车辆通信链路的性能，尤其是在信道表现出大量多普勒频偏（DFOs）时。 正交时频空间（OTFS）是一种在时延-多普勒域中设计的新波形，可以有效地将双倍色散信道转换为几乎无衰落的信道，这使其在V2X通信中非常有吸引力。 在本文中，我们设计了一个基于OTFS的多天线接收机，以处理V2X系统中的高移动性挑战。 我们表明，可以通过多天线提供的高空间分辨率分离与多径相关的多个DFOs，这导致了时延-多普勒域中OTFS信道的稀疏性增强，并有可能降低信息传递（MP）检测算法的复杂度。 基于这一观察，我们进一步提出了一个联合MP-最大比合并（MRC）的迭代检测方法用于OTFS，其中MRC的集成显著提高了迭代的收敛性能，并获得了出色的系统误码性能。 最后，我们提供了数值仿真结果来验证所提出方案的优越性。 显示英文摘要

摘要： Vehicle-to-everything (V2X) is considered as one of the most important applications of future wireless communication networks. However, the Doppler effect caused by the vehicle mobility may seriously deteriorate the performance of the vehicular communication links, especially when the channels exhibit a large number of Doppler frequency offsets (DFOs). Orthogonal time frequency space (OTFS) is a new waveform designed in the delay-Doppler domain, and can effectively convert a doubly dispersive channel into an almost non-fading channel, which makes it very attractive for V2X communications. In this paper, we design a novel OTFS based receiver with multi-antennas to deal with the high-mobility challenges in V2X systems. We show that the multiple DFOs associated with multipaths can be separated with the high-spatial resolution provided by multi-antennas, which leads to an enhanced sparsity of the OTFS channel in the delay-Doppler domain and bears a potential to reduce the complexity of the message passing (MP) detection algorithm. Based on this observation, we further propose a joint MP-maximum ration combining (MRC) iterative detection for OTFS, where the integration of MRC significantly improves the convergence performance of the iteration and gains an excellent system error performance. Finally, we provide numerical simulation results to corroborate the superiorities of the proposed scheme.