A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

• Published in: Wireless communications and mobile computing Vol. 2018; no. 2018; pp. 1 - 24
• Main Authors: Karabulut Kurt, Güneş, Gokceli, Selahattin, Toka, Mesut, Aldababsa, Mahmoud, Kucur, Oğuz
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 01.01.2018; Hindawi; John Wiley & Sons, Inc
• Subjects: Bandwidths; Code Division Multiple Access; Communications networks; Connectivity; Energy efficiency; Internet of Things; Network latency; Nonorthogonal multiple access; Receivers & amplifiers; Researchers; Signal processing; Spectrum allocation; Wireless communications; Wireless networks
• ISSN: 1530-8669; 1530-8677
• DOI: 10.1155/2018/9713450

Today’s wireless networks allocate radio resources to users based on the orthogonal multiple access (OMA) principle. However, as the number of users increases, OMA based approaches may not meet the stringent emerging requirements including very high spectral efficiency, very low latency, and massive device connectivity. Nonorthogonal multiple access (NOMA) principle emerges as a solution to improve the spectral efficiency while allowing some degree of multiple access interference at receivers. In this tutorial style paper, we target providing a unified model for NOMA, including uplink and downlink transmissions, along with the extensions to multiple input multiple output and cooperative communication scenarios. Through numerical examples, we compare the performances of OMA and NOMA networks. Implementation aspects and open issues are also detailed.