OTFS-NOMA: An Efficient Approach for Exploiting Heterogenous User Mobility Profiles

Zhiguo Ding, Robert Schober, Pingzhi Fan, H. Vincent Poor

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

This paper considers a challenging communication scenario, in which users have heterogenous mobility profiles, e.g., some users are moving at high speeds and some users are static. A new non-orthogonal multiple-access (NOMA) transmission protocol that incorporates orthogonal time frequency space (OTFS) modulation is proposed. Thereby, users with different mobility profiles are grouped together for the implementation of NOMA. The proposed OTFS-NOMA protocol is shown to be applicable to both uplink and downlink transmission, where sophisticated transmit and receive strategies are developed to remove inter-symbol interference and harvest both multi-path and multi-user diversity. Analytical results demonstrate that both the high-mobility and the low-mobility users benefit from the application of OTFS-NOMA. In particular, the use of NOMA allows the spreading of the high-mobility users' signals over a large amount of time-frequency resources, which enhances the OTFS resolution and improves the detection reliability. In addition, OTFS-NOMA ensures that low-mobility users have access to bandwidth resources which in conventional OTFS-orthogonal multiple access (OTFS-OMA) would be solely occupied by the high-mobility users. Thus, OTFS-NOMA improves the spectral efficiency and reduces latency.

Original languageEnglish (US)
Article number8786203
Pages (from-to)7950-7965
Number of pages16
JournalIEEE Transactions on Communications
Volume67
Issue number11
DOIs
StatePublished - Nov 2019

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • Orthogonal time frequency space (OTFS)
  • dual plane multiple access
  • non-orthogonal multiple access (NOMA)
  • uplink and downlink transmission

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