A Survey on Low Complexity Detectors for OTFS Systems

• 作者: ZHANG Zhengquan LIU Heng WANG Qianli FAN Pingzhi
• 来源期刊: 中兴通讯技术（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Special Topic
• 页码范围: 3-15
• 页数: 13页
• 语种: 英文
• DOI: 10.12142/ZTECOM.202104002

摘要

The newly emerging orthogonal time frequency space (OTFS) modulation can ob? tain delay-Doppler diversity gain to significantly improve the system performance in high mobility wireless communication scenarios such as vehicle-to-everything (V2X), high-speed railway and unmanned aerial vehicles (UAV), by employing inverse symplectic finite Fouri? er transform (ISFFT) and symplectic finite Fourier transform (SFFT). However, OTFS modu? lation will dramatically increase system complexity, especially at the receiver side. Thus, de? signing low complexity OTFS receiver is a key issue for OTFS modulation to be adopted by new-generation wireless communication systems. In this paper, we review low complexity OTFS detectors and provide some insights on future researches. We firstly present the OTFS system model and basic principles, followed by an overview of OTFS detector structures, classifications and comparative discussion. We also survey the principles of OTFS detection algorithms. Furthermore, we discuss the design of hybrid OTFS and orthogonal frequency di?vision multiplexing (OFDM) detectors in single user and multi-user multi-waveform commu?nication systems. Finally, we address the main challenges in designing low complexity OT?FS detectors and identify some future research directions.