A survey and taxonomy on nonorthogonal multiple‐access schemes for 5G networks

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.

Unmanned Aerial Vehicles enabled IoT Platform for Disaster Management

“…Spectrum is another focus area for cellular connected UAVs. Multicell cooperation, nonorthogonal multiple access (NOMA), and cognitive radio (CR) are promising technologies for future cellular connected UAVs [27][28][29][30]. Moreover, a spectrum sensing architecture has been investigated to enhance UAVs connectivity over the unlicensed spectrum in [31].…”

Cooperative non‐orthogonal multiple access with SWIPT over Nakagami‐m fading channels

“…NOMA is an exciting and emerging multiple access technique, which is viewed as one of the key players in 5G, because of its manifold spectral gains. [3][4][5] In a NOMA-based system, multiple signals are superimposed in power domain at the transmitter side, by the same code at the same frequency, which is unlike the conventional multiple access (orthogonal multiple access [OMA]) schemes (eg, frequency/time/code division multiple access). At the receiver side, signal decoding technique such as successive interference cancelation (SIC) can be carried out to decode each signal.…”

Performance analysis of cooperative nonorthogonal multiple access with improved time switching simultaneous wireless information and power transfer protocol

“…NOMA is a developing multiple access method that is a vital player in B5G owing to channel capacity achievements 3‐5 . Various signals are superimposed based on different power levels at the transmitter end maintaining the same time and frequency in a NOMA system, and this is the main aspect that differentiates the NOMA system from existing multiple access systems, such as the orthogonal multiple access (OMA) system 5,6 . Detailed classifications and challenges of NOMA are discussed in Reference 5.…”