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Asynchronous NOMA Downlink Based on Single-Carrier Frequency-Domain Equalization

Tomonari KURAYAMA, Teruyuki MIYAJIMA, Yoshiki SUGITANI

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Summary :

Non-orthogonal multiple access (NOMA) allows several users to multiplex in the power-domain to improve spectral efficiency. To further improve its performance, it is desirable to reduce inter-user interference (IUI). In this paper, we propose a downlink asynchronous NOMA (ANOMA) scheme applicable to frequency-selective channels. The proposed scheme introduces an intentional symbol offset between the multiplexed signals to reduce IUI, and it employs cyclic-prefixed single-carrier transmission with frequency-domain equalization (FDE) to reduce inter-symbol interference. We show that the mean square error for the FDE of the proposed ANOMA scheme is smaller than that of a conventional NOMA scheme. Simulation results show that the proposed ANOMA with appropriate power allocation achieves a better sum rate compared to the conventional NOMA.

Publication
IEICE TRANSACTIONS on Communications Vol.E105-B No.10 pp.1173-1180
Publication Date
2022/10/01
Publicized
2022/04/06
Online ISSN
1745-1345
DOI
10.1587/transcom.2021MEP0003
Type of Manuscript
Special Section PAPER (Special Section on Multidisciplinary and Innovative Key technologies in Advanced communication systems (MIKA))
Category

Authors

Tomonari KURAYAMA
  Ibaraki University
Teruyuki MIYAJIMA
  Ibaraki University
Yoshiki SUGITANI
  Ibaraki University

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