论文标题
前缀/后缀配置对具有矩形波形的OTFS系统的影响
Effect of Prefix/Suffix Configurations on OTFS Systems with Rectangular Waveforms
论文作者
论文摘要
最近，正交时频空间（OTFS）调制被用作有前途的高移动性通信方案的有前途的候选波形。在实际传输中，使用不同的前缀/后缀配置（包括还原循环前缀（RCP），Full-CP（FCP），Full-Zero后缀（FZS）（FZS）和零零填充（RZP）（RZP），使用不同的前缀/后缀配置实现了具有矩形脉冲成型的OTF。但是，对于每种前缀/后缀类型，在接收器侧可见不同的有效信道，从而在给定特定的通信方案的情况下，导致各种OTFS配置的性能不同。为了满足这一差距，在本文中，我们使用各种前缀/后缀配置来研究和建模OTFS系统中的有效信道。然后，从接收信号的输入输出关系分析中，我们表明OTFS对于所有前缀/后缀类型都有简单的稀疏结构，其中唯一的区别是在延迟多置编码网格中延伸的Quasi-periody时引入的相术语。我们在通道估计/均衡复杂性，符号检测性能，功率和光谱效率方面提供了所有OTFS类型之间的全面比较，这有助于确定特定情况的最佳前缀/后缀配置。最后，我们提出了一种新型的OTFS结构，即降低了FCP（RFCP），其中CP块的信息是可解码的。
Recently, orthogonal time-frequency-space (OTFS) modulation is used as a promising candidate waveform for high mobility communication scenarios. In practical transmission, OTFS with rectangular pulse shaping is implemented using different prefix/suffix configurations including reduced-cyclic prefix (RCP), full-CP (FCP), full-zero suffix (FZS), and reduced-zero padded (RZP). However, for each prefix/suffix type, different effective channel are seen at the receiver side resulting in dissimilar performance of the various OTFS configurations given a specific communication scenario. To fulfill this gap, in this paper, we study and model the effective channel in OTFS systems using various prefix/suffix configurations. Then, from the input-output relation analysis of the received signal, we show that the OTFS has a simple sparse structure for all prefix/suffix types, where the only difference is the phase term introduced when extending quasi-periodically in the delay-Doppler grid. We provide a comprehensive comparison between all OTFS types in terms of channel estimation/equalization complexity, symbol detection performance, power and spectral efficiencies, which helps in deciding the optimal prefix/suffix configuration for a specific scenario. Finally, we propose a novel OTFS structure namely reduced-FCP (RFCP) where the information of the CP block is decodable.
