Enhanced Non-Orthogonal Multiple Access Using Data-Aware Power Assignment

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2 Scopus citations

Abstract

Non-orthogonal multiple access (NOMA) is a promising candidate for future wireless networks due to its ability to improve the spectral-efficiency and network connectivity. Nevertheless, the error rate performance of NOMA depends significantly on the power assignment, which requires accurate knowledge of the channel state information at the transmitter (CSIT). However, providing accurate CSIT can be challenging. Therefore, this paper proposes a data-aware adaptive power assignment NOMA scheme called PANOMA which adaptively changes the signal power based on the transmitted data to maximize the constructive interference. To quantify its potential, closed-form bit error rate (BER) expressions are derived for two users over the broadcast Rayleigh fading channel. Based on these expressions, the power assignment that minimizes the system's average BER is found. The results demonstrate that PANOMA provides a tangible BER performance gain over conventional power-domain NOMA when both schemes use optimal power and sub-optimal power assignments. Also, PANOMA provides robustness to imperfect power assignment which results from imperfect CSIT. The integrity of the analytical results is verified by Monte Carlo simulation.

Original languageBritish English
Title of host publication2021 International Symposium on Networks, Computers and Communications, ISNCC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9780738113166
DOIs
StatePublished - 2021
Event2021 International Symposium on Networks, Computers and Communications, ISNCC 2021 - Dubai, United Arab Emirates
Duration: 31 Oct 20212 Nov 2021

Publication series

Name2021 International Symposium on Networks, Computers and Communications, ISNCC 2021

Conference

Conference2021 International Symposium on Networks, Computers and Communications, ISNCC 2021
Country/TerritoryUnited Arab Emirates
CityDubai
Period31/10/212/11/21

Keywords

  • Bit error rate (BER)
  • Constructive interference
  • Non-orthogonal multiple access (NOMA)
  • Power assignment

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