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A survey and taxonomy on nonorthogonal multiple‐access schemes for 5G networks
Author(s) -
Basharat Mehak,
Ejaz Waleed,
Naeem Muhammad,
Khattak Asad Masood,
Anpalagan Alagan
Publication year - 2018
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3202
Subject(s) - noma , computer science , spectral efficiency , wireless , computer network , wireless network , the internet , low latency (capital markets) , bandwidth (computing) , distributed computing , telecommunications , telecommunications link , world wide web , channel (broadcasting)
Abstract The intensity in the requirements of Internet of Things and mobile internet makes the efficiency of fifth‐generation (5G) wireless communications very challenging to achieve. Accomplishing the drastically increasing demand of massive connectivity and high spectral efficiency is a strenuous task. Because of the very large number of devices, 5G wireless communication systems are inevitable to satisfy the traffic requirements. Recently, nonorthogonal multiple‐access (NOMA) schemes are immensely being explored to address the challenges in 5G, which include effective bandwidth utilization, support for a massive number of devices, and low latency. This paper provides the reader with a holistic view of multiple‐access schemes, methods, and strategies for optimization in NOMA. First, we discuss the taxonomy of multiple‐access schemes in the literature; then, we provide a detailed discussion of objectives, constraints, problem types, and solution approaches for NOMA. This paper also discusses the decoding methods and key performance indicators used in NOMA. Finally, we outline future research directions.