Power-Domain Downlink NOMA Constellation Design with Heterogeneous Reliability Requirements

Hsuan Po Liu, Yu-Chih Huang, Shin Lin Shieh, Po Ning Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For power-domain uplink NOMA, a parallelogram-structured constellation design based on minimum distance (MD) criterion has been proposed in [1]. Such design reveals a significant improvement, in comparison with other existing designs, by not only achieving a larger MD, but also outperforming them in both symbol error rates (SER) and achievable transmission rates. In this paper, for the downlink NOMA scenario, a modification of the parallelogram-structured constellation is proposed. Our analysis confirms that the proposed constellation provides a much larger MD than the conventional square constellation design with the MD-maximizing inter-constellation rotation. Furthermore, unlike most of the previous works that assume successive interference cancellation (SIC) receivers, where error propagation and large decoding complexity and latency arise, we adopt the joint maximum-likelihood (JML) detection, together with individual decoding. Simulation results show that by considering the heterogeneous reliability requirements, the proposed constellation design significantly improves the bit error performance of the strong user, while maintains the performance of the weak user. As a result, the proposed scheme is suitable for those applications that require, e.g., low latency, while dictating heterogeneous reliability.

Original languageEnglish
Title of host publication2020 14th International Conference on Signal Processing and Communication Systems, ICSPCS 2020 - Proceedings
EditorsTadeusz A Wysocki, Beata J Wysocki
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728199726
DOIs
StatePublished - 14 Dec 2020
Event14th International Conference on Signal Processing and Communication Systems, ICSPCS 2020 - Virtual, Adelaide, Australia
Duration: 14 Dec 202016 Dec 2020

Publication series

Name2020 14th International Conference on Signal Processing and Communication Systems, ICSPCS 2020 - Proceedings

Conference

Conference14th International Conference on Signal Processing and Communication Systems, ICSPCS 2020
CountryAustralia
CityVirtual, Adelaide
Period14/12/2016/12/20

Keywords

  • Constellation Design
  • Heterogeneous Reliability
  • NOMA

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