Combining Code-Domain and Power-Domain NOMA for Supporting Higher Number of Users

Naveen Mysore Balasubramanya, Ankit Gupta, Mathini Sellathurai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Citations (Scopus)
821 Downloads (Pure)


Non-orthogonal multiple access (NOMA) is one of the key technologies being evaluated for the fifth generation (5G) wireless communications. In this paper, a novel NOMA mechanism combining both the code-domain and power-domain techniques is proposed to potentially support a higher number of users. In particular, considering the code-domain NOMA method of sparse code multiple access (SCMA) as the baseline, new low data rate (LDR) users are added on top of it using power-domain NOMA. The optimization problem involving resource and power allocation in such a system is solved such that the overall achievable sum-rate is maximized. Simulation results indicate that the proposed mechanism not only supports higher number of users, but also demonstrates a higher achievable sum-rate than the original SCMA-based system.

Original languageEnglish
Title of host publication2018 IEEE Global Communications Conference (GLOBECOM)
ISBN (Electronic)9781538647271
Publication statusPublished - 21 Feb 2019
Event2018 IEEE Global Communications Conference - Abu Dhabi, United Arab Emirates
Duration: 9 Dec 201813 Dec 2018

Publication series

NameIEEE Global Communications Conference
ISSN (Electronic)2576-6813


Conference2018 IEEE Global Communications Conference
Abbreviated titleGLOBECOM 2018
Country/TerritoryUnited Arab Emirates
CityAbu Dhabi


  • integer programming
  • NOMA
  • resource allocation
  • SCMA
  • successive convex approximation

ASJC Scopus subject areas

  • Information Systems and Management
  • Renewable Energy, Sustainability and the Environment
  • Safety, Risk, Reliability and Quality
  • Signal Processing
  • Modelling and Simulation
  • Instrumentation
  • Computer Networks and Communications


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