ZTE Communications ›› 2021, Vol. 19 ›› Issue (4): 63-70.DOI: 10.12142/ZTECOM.202104007

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OTFS Enabled NOMA for MMTC Systems over LEO Satellite

MA Yiyan1, MA Guoyu1(), WANG Ning2, ZHONG Zhangdui1, AI Bo1,3()   

  1. 1.Beijing Jiaotong University, Beijing 100044, China
    2.Zhengzhou University, Zhengzhou 450001, China
    3.Peng Cheng Laboratory, Shenzhen 518000, China
  • Received:2021-10-09 Online:2021-12-25 Published:2022-01-04
  • About author:MA Yiyan received the B.S. degree in applied physics from Beijing Jiaotong University, China in 2019, and is currently working toward the Ph.D. degree at the State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University. His current research interests include the field of Internet of Things and massive machine type communications.|MA Guoyu (magy@bjtu.edu.cn) received the B.S. and Ph.D. degrees in electrical engineering from Beijing Jiaotong University, China in 2012 and 2019, respectively. Currently he is an associate professor at the State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University. His current research interests include machine-type communications and random access.|WANG Ning received the B.E. degree in communication engineering from Tianjin University, China in 2004, the M.A.Sc. degree in electrical engineering from The University of British Columbia, Canada in 2010, and the Ph.D. degree in electrical engineering from the University of Victoria, Canada in 2013. He was on the Finalist of the Governor General’s Gold Medal for Outstanding Graduating Doctoral Student with the University of Victoria in 2013. From 2004 to 2008, he was with the China Information Technology Design and Consulting Institute as a mobile communication system engineer, specializing in planning and design of commercial mobile communication networks, network traffic analysis, and radio network optimization. He was a postdoctoral research fellow with the Department of Electrical and Computer Engineering, The University of British Columbia, from 2013 to 2015. Since 2015, he has been with the School of Information Engineering, Zhengzhou University, China, where he is currently an associate professor. He also holds adjunct appointments with the Department of Electrical and Computer Engineering, McMaster University, Canada, and the Department of Electrical and Computer Engineering, University of Victoria. He has served on the technical program committees of international conferences, including the IEEE GLOBECOM, IEEE ICC, IEEE WCNC, and CyberC. His research interests include resource allocation and security designs of future cellular networks, channel modeling for wireless communications, statistical signal processing, and cooperative wireless communications.|ZHONG Zhangdui is currently a professor and advisor of Ph.D. candidates with Beijing Jiaotong University, China. He is also a chief scientist with the State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University. He is a director of the Innovative Research Team of Ministry of Education and a chief scientist of Ministry of Railways in China. He is an executive council member of Radio Association of China and a deputy director of Radio Association of Beijing. He has authored/coauthored seven books, five invention patents, and more than 200 scientific research papers in his research area. His interests include wireless communications for railways, control theory and techniques for railways, and GSM-R system. His research results have been widely used in railway engineering, including the Qinghai-Xizang railway, Datong-Qinhuangdao heavy haul railway and many high-speed railway lines in China. Prof. ZHONG was the recipient of a Maoyisheng Scientific Award of China, Zhantianyou Railway Honorary Award of China, and Top Ten Science/Technology Achievements Award of Chinese Universities. He is a fellow of IEEE.|AI Bo (boai@bjtu.edu.cn) graduated from Tsinghua University, China, with the honor of Excellent Postdoctoral Research Fellow in 2007. He received the master’s and Ph.D. degrees from Xidian University, China in 2002 and 2004, respectively.He is currently working as a full professor and a Ph.D. advisor with Beijing Jiaotong University, China, where he is also the deputy director of the State Key Laboratory of Rail Traffic Control and Safety and the International Joint Research Center. He has authored or coauthored eight books and published over 300 academic research papers in his research area. He holds 26 invention patents. He has been the research team leader for 26 national projects and has won some important scientific research prizes. Five of his papers have been the ESI highly cited papers. He has been notified by the Council of Canadian Academies (CCA) that, based on Scopus database, he has been listed as one of the Top 1% authors in his field all over the world. His research interests include the research and applications of channel measurement and channel modeling and dedicated mobile communications for rail traffic systems. He is a fellow of IEEE and IET.
  • Supported by:
    the Fundamental Research Funds for the Central Universities(2021YJS202);the National Key Research and Development Program(2016YFE0200900);NSFC(61725101);the Royal Society Newton Advanced Fellowship(61961130391);Beijing Natural Haidian Joint Fund(L172020);Major Projects of Beijing Municipal Science and Technology Commission(Z181100003218010);State Key Lab of Rail Traffic Control and Safety(RCS2021ZQ002);Teaching Reform Project(134496522);the Open Research Fund from Shenzhen Research Institute of Big Data(2019ORF01006);the PCL Future Greater-Bay Area Network Facilities for Large-scale Experiments and Applications Project(LZ0019)


As a complement of terrestrial networks, non-terrestrial networks (NTN) have advantages of wide-area coverage and service continuity. The NTN is potential to play an important role in the 5G new radio (NR) and beyond. To enable the massive machine type communications (mMTC), the low earth orbit (LEO) satellite is preferred due to its lower transmission delay and path loss. However, the LEO satellite may generate notable Doppler shifts to degrade the system performance. Recently, orthogonal time frequency space (OTFS) modulation has been proposed. It provides the opportunity to allocate delay Doppler (DD) domain resources, which is promising for mitigating the effect of high mobility. Besides, as the LEO satellite constellation systems such as Starlink are thriving, the space spectrum resources have become increasingly scarce. Therefore, non-orthogonal multiple access (NOMA) is considered as a candidate technology to realize mMTC with limited spectrum resources. In this paper, the application of OTFS enabled NOMA for mMTC over the LEO satellite is investigated. The LEO satellite based mMTC system and the OTFS-NOMA schemes are described. Subsequently, the challenges of applying OTFS and NOMA into LEO satellite mMTC systems are discussed. Finally, the potential technologies for the systems are investigated.

Key words: mMTC, LEO satellite, OTFS, NOMA