NOMA: An information-theoretic perspective

Mojtaba Vaezi, H. Vincent Poor

Research output: Chapter in Book/Report/Conference proceedingChapter

25 Scopus citations


Non-orthogonal multiple access (NOMA) is a potential enabler for the development of 5G and beyond wireless networks. By allowing multiple users to share the same resource (time/frequency/code/space), NOMA can scale up the number of served users, increase the spectral efficiency, and improve user-fairness compared to existing orthogonal multiple access (OMA) techniques. The basic premise behind NOMA in a single-cell network is to reap the benefits promised by information theory for the downlink and uplink transmission of wireless systems, modeled respectively by the broadcast channel (BC) and multiple access channel (MAC). The capacity regions of the BC and MAC have been established several decades ago, and concurrent non-orthogonal transmission is the optimal transmission strategy in both cases. Unlike the single-cell setting, the capacity region of multi-cell wireless networks, commonly modeled by the interference channel (IC), is in general unknown. However, it is known that OMA is suboptimal. This chapter reviews what information theory promises and proposes for NOMA in single- and multi-cell networks with both single- and multi-antenna nodes. Furthermore, relevant physical layer security channel models are proposed and discussed.

Original languageEnglish (US)
Title of host publicationMultiple Access Techniques for 5G Wireless Networks and Beyond
PublisherSpringer International Publishing
Number of pages27
ISBN (Electronic)9783319920900
ISBN (Print)9783319920894
StatePublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Computer Science


  • Broadcast channel
  • Interference channel
  • MIMO
  • Multi-cell networks
  • Multiple access channel
  • NOMA
  • Security 5G
  • Superposition coding rate-splitting


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