Abstract
The fifth generation (5G) wireless systems are anticipated to meet unprecedented capacity and latency requirements. In order to resolve these challenges in 5G, non-orthogonal multiple access (NOMA) is considered as a promising technique due to its ability to enhance spectrum efficiency and user access. As opposed to conventional orthogonal multiple access (OMA) which relies on orthogonal resource sharing, NOMA has a potential of supporting a higher number of users by multiplexing different users in the same resource in a non-orthogonal manner. With advanced receiver techniques, such as successive interference cancellation (SIC), the intra-user interference can be minimized at the NOMA receiver. To date, there are comprehensive surveys on NOMA, which describe the integration of NOMA with different communication technologies and discuss different NOMA classifications. However, the existing literature is scarce in reviewing state-of-the-art applications of NOMA from the perspective of its application to cellular networks (CNs), device-to-device (D2D) communications, and wireless sensor networks (WSNs). Therefore, the purpose of this survey is to fill this gap in knowledge. Specifically, NOMA with its underlying concepts are elaborated in detail. In addition, detailed system model of different NOMA-based wireless networks is presented. Furthermore, irrespective of the underlying spatial topology of the considered NOMA-based wireless network, general analytical expressions are presented to characterize the network performance. Finally, some challenges related to NOMA design are highlighted and potential research directions are pointed out to address these issues.
Highlights
The blistering growth in wireless devices, such as smart phones and tablets, coupled with rapid evolution in mobile Internet technology, have massively transformed the use of traditional analog voice telephony to resource ravenous multimedia applications
This completes the discussion of outage probability for Single-cell single-tier (SCST) non-orthogonal multiple access (NOMA) cellular networks (CNs) and we describe the problem of optimal power allocation in subsection
The results demonstrate that the considered network achieves better rate and quality of experience (QoE) compared to the conventional orthogonal multiple access (OMA)
Summary
The blistering growth in wireless devices, such as smart phones and tablets, coupled with rapid evolution in mobile Internet technology, have massively transformed the use of traditional analog voice telephony to resource ravenous multimedia applications. The key idea of NOMA is that multiple users simultaneously share the same radio resource i.e., the users access the channel in a non-orthogonal manner This would enhance the spectrum efficiency at the expense of increased receiver complexity, which is ineluctably required to separate users’ messages. Apart from improving spectral efficiency and fairness over conventional OMA, NOMA has a strong potential to improve the cell-edge throughput, requires relaxed channel feedback, and to significantly reduce the overall latency [12] These properties make NOMA a suitable and promising MA candidate to support massive connectivity requirement in 5G systems [13,14]. Standard for digital television (TV) broadcasting is based on the NOMA principle, where multiple data streams are superimposed in a same resource This would result in an enhanced spectral efficiency for the TV broadcasting system [17].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
