You are here

Non-Orthogonal Multiple Access for 5G


In the 5th generation (5G) of wireless communication systems, hitherto unprecedented requirements such as high spectral efficiency, massive connectivity, and low latency are expected to be satisfied. As a promising technique to address these challenges, non-orthogonal multiple access (NOMA) has been actively investigated in recent years. Unlike conventional orthogonal multiple access (OMA) schemes, the key idea of NOMA is to support multiple users by non-orthogonal resource allocation, and hence introduce a controllable amount of inter-user interferences that can be mitigated with the aid of sophisticated multi-user detectors at the cost of increased receiver complexity. Recently, various novel NOMA schemes have been extensively investigated for 5G, such as power-domain NOMA, code-domain NOMA including multiple access solutions relying on low-density spreading, sparse code multiple access, lattice partition multiple access, multi-user shared access, as well as pattern division multiple access. Moreover, standardization work on NOMA has been started in 3GPP under the name multi-user superposition transmission (MUST). The NOMA principle has also been recently standardized by the next generation digital TV standard ATSC 3.0 under the term layered division multiplexing (LDM), and related field test results have demonstrated significant gains in spectral efficiency.

This special issue aims to not only serve as a collection of new ideas and recent developments addressing the challenges arising in future 5G cellular networks employing NOMA, but also to inspire researchers to contribute to this promising field.

Prospective authors are invited to submit their manuscripts on the topics of interest within the scope of this issue. Topics of interest include but are not limited to:

  • Theoretical analysis of NOMA
  • Design of channel coding and modulation for NOMA
  • Transceiver design in NOMA networks
  • Resource allocation for NOMA
  • Energy-efficient NOMA
  • System-level enabling technologies for NOMA
  • Grant-free NOMA
  • Extension of NOMA to MIMO-NOMA
  • NOMA in doubly-selective channels
  • Integration of NOMA with other 5G key technologies
  • Base station cooperation in NOMA systems
  • Cognitive radio inspired NOMA
  • Implementation of NOMA
  • Emerging applications of NOMA
  • Hybrid NOMA and other multiple access schemes


Linglong Dai (Lead)
Tsinghua University, China

Naofal Al-Dhahir
University of Texas at Dallas, USA

George K. Karagiannidis
Aristotle University of Thessaloniki, Greece

Robert Schober
Friedrich Alexander University, Germany

Zhiguo Ding
Lancaster University, UK

Chih-Lin I
China Mobile, China

Ioannis Krikidis
Cyprus University, Cyprus