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Non orthogonal multiple access (NOMA for 5G networks)

In recent years, non-orthogonal multiple access (NOMA) schemes have received significant attention for the fifth generation (5G) cellular networks [1]- [2]. The primary reason for adopting NOMA in 5G owes to its ability of serving multiple users using the same time and frequency resources. There exist two main NOMA techniques: power-domain and. Nonorthogonal multiple access (NOMA), which has been recently proposed for the third-generation partnership projects long-term evolution advanced (3GPP-LTE-A), constitutes a promising technology of addressing the aforementioned challenges in 5G networks by accommodating several users within the same orthogonal resource block

NOMA in 5G Systems - IEEE Future Network

Nonorthogonal Multiple Access for 5G and Beyond IEEE

NOMA | Non-Orthogonal Multiple Access. The NOMA is a multiple access technique employed in 5G cellular wireless network. The main function of NOMA is to serve multiple UEs (User Equipments) using single 5G-NB (Node B or Base Station). It serves multiple users on same time/frequency resources. There are two main techniques employed in NOMA for. An efficient Multiple Access in Cognitive Radio probabilistic model is introduced to measure the performance [5] Zhiguo Ding, Yuanwei Liu, Jinho Choi, Qi Sun, Maged Elkashlan, Chih-Lin I and H. Vincent Poor, Application of Non-Orthogonal of system and model complexity is control by the paired Multiple Access in LTE and 5G Networks users

Orthogonal Frequency Division Multiple Access (OFDMA) as well as other orthogonal multiple access techniques fail to achieve the system capacity limit in the uplink due to the exclusivity in resource allocation. This issue is more prominent when fairness among the users is considered in the system. Current Non-Orthogonal Multiple Access (NOMA) techniques introduce redundancy by coding. Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput downlink non-orthogonal multiple access (NOMA), in PIMRC 2013. [2] Z. Ding, Z. Yang, P. Fan and H. V. Poor, On the Performance of Non-Orthogonal Multiple Access in 5G Systems with Randomly Deployed Users, IEEE SPL, 2014. Key ideas: • All the users are served at the same time, frequency and cod Abstract: As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for 3GPP LTE and is envisioned to be an essential component of 5G mobile networks. The key feature of NOMA is to serve multiple users at the same time/frequency/ code, but with different power levels, which yields a significant spectral efficiency gain over. 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.

With the development of mobile Internet and Internet of things (IoT), the 5th generation (5G) wireless communications will foresee explosive increase in mobile traffic. To address challenges in 5G such as higher spectral efficiency, massive connectivity, and lower latency, some non-orthogonal multiple access (NOMA) schemes have been recently actively investigated, including power-domain NOMA. Non-orthogonal multiple access (NOMA) scheme is emerging as a favourable multiple access scheme for future 5G networks. Compared to orthogonal multiple access techniques, NOMA provides spectral efficiency, user fairness, better connectivity, enhanced data rate and reduced latency. Thus, NOMA can be a suitable multiple access technique for 5G networks. On the other hand, in wireless networks. The key idea of NOMA is to use the power domain for multiple access, whereas the previous generations of mobile networks have been relying on the time/frequency/code domain. Take the conventional orthogonal frequency-division multiple access (OFDM..

  1. Non Orthogonal Multiple Access (NOMA) is capable of supporting a massive number of mobile users with higher data rates for 5G networks . NOMA aims to support more mobile users using especially power domain. There are three main types of NOMA as power-domain NOMA, code-domain NOMA, and NOMA multiplexing in multiple domains
  2. Non-orthogonal multiple access (NOMA), allowing multiple user equipments (UEs) to share the overlapping spectrum resources, is a promising multiple access technology of 5G and has attracted great attention in both industry and academia in recent years (Dai et al., 2015)
  3. Abstract: Non-orthogonal multiple access (NOMA) has been considered a key technology to address the increasing traffic demands for fifth-generation (5G) cellular wireless communication networks and internet of things. The NOMA technique offer

Yang Lu, Xianrong Zheng, in Journal of Industrial Information Integration, 2020. 5.2.3.7 Multiple access system. NOMA (non-orthogonal multiple access) will become the representative access technology for 5 G and 6 G mobile communications.It is an important part of the development of 5 G/6 G to implement polarization coding technology to the above system and to optimize the channel polarization. Non-orthogonal multiple access (NOMA) has been recently recognized as a promising multiple access (MA) technique to significantly improve the spectral efficiency of mobile communication networks. For example, multiuser superposition transmission (MUST), a downlink version of NOMA, has been proposed for 3rd generation partnership project long.

1 Non-Orthogonal Multiple Access for 5G and Beyond Yuanwei Liu, Member, IEEE, Zhijin Qin, Member, IEEE, Maged Elkashlan, Member, IEEE, Zhiguo Ding, Senior Member, IEEE, Arumugam Nallanathan, Fellow, IEEE, and Lajos Hanzo, Fellow, IEEE, Abstract—Driven by the rapid escalation of the wireless capacity requirements imposed by advanced multimedia ap-plications (e.g., ultra-high-definition video. Introduction. This book presents comprehensive coverage of current and emerging multiple access, random access, and waveform design techniques for 5G wireless networks and beyond. A definitive reference for researchers in these fields, the book describes recent research from academia, industry, and standardization bodies

Non-orthogonal multiple access, NOMA: NOMA is one of the techniques being considered as a 5G multiple access scheme. NOMA superposes multiple users in the power domain, using cancellation techniques to remove the more powerful signal. NOMA could use orthogonal frequency division multiple access, OFDMA or the discrete Fourier transform, DFT. Y. Liu, Z. Qin, and Z. Ding, Non-Orthogonal Multiple Access for Massive Connectivity, Springer, 2019. This book discusses various challenges (capability, sustainability, security, etc.) that arise in NOMA applications. Various applications are covered, including heterogeneous networks (HetNets), MIMO enabled networks, and CR networks

Webinar on Orthogonal Multiple Access (NOMA) for 5G and

Non-orthogonal multiple access (NOMA), enabling different user equipments (UEs) sharing overlapping wireless resources, is regarded as one of the most promising key technologies of 5G, and has attracted great attention in both industry and academia in recent years Non-orthogonal multiple access (NOMA), which has been recently proposed for the 3rd generation partnership projects long-term evolution advanced (3GPP-LTE-A), constitutes a promising technology of addressing the above-mentioned challenges in 5G networks by accommodating several users within the same orthogonal resource block

anuradha udunuwara's blog: In search of a Multiple Access

A Survey on Non-Orthogonal Multiple Access for 5G Networks

Non-Orthogonal Multiple Access - ITN Spotligh

From OMA to NOMA 1 Question: What is multiple access? 2 Orthogonal multiple access (OMA): e.g., FDMA, TDMA, CDMA, OFDMA. 3 New requirements in 5G High spectrum efficiency. Massive connectivity. 4 Non-orthogonal multiple access (NOMA): to break orthogonality. 5 Standard and industry developments on NOMA Whitepapers for 5G: DOCOMO, METIS, NGMN, ZTE, SK Telecom, etc Non-orthogonal Multiple Access (NOMA) • In mathematics, orthogonality is the generalization of the notion of Z. Ding, Y. Liu, J. Choi, Q. Sun, M. Elkashlan, Chih-Lin I, and H. V. Poor, Application of Non-orthogonal Multiple Access in LTE and 5G Networks, IEEE Communication Magazine, 2017. Frequency User 2 User 1 User 1 User 2 SIC. Non-Orthogonal Multiple Access (NOMA) 5G Training - Tonex Training. Length: 3 Days. 5G Wireless utilizing NOMA training covers the major 5G remote interchanges including, channels, antennas, propagation, 3GPP New Radio (NR), Next Generation (NexGen), issues encompassing rising 5G remote LAN and cell/backhaul applications The previous generations of networks have employed OMA schemes, such as frequency division multiple access (FDMA) of first generation (1G), time division multiple access (TDMA) of 2G, code division multiple access (CDMA) of 3G, and orthogonal frequency division multiple access (OFDMA) of 4G. In NOMA, multi- ple users can utilize nonorthogonal.

through efficiently accommodating multiple users [4]-[8]. Re-cently, non-orthogonal multiple access (NOMA) has been en-visioned as one of the key enabling techniques to address these high data rate requirements and it is expected to significantly enhance throughput as well as to support massive connectivity in 5G networks and beyond Non-Orthogonal Multiple Access for 5G and Beyond Yuanwei Liu, Zhijin Qin, Maged Elkashlan, Zhiguo Ding, Arumugam Nallanathan, and Lajos Hanzo Queen Mary University of London Lancaster University University of Southampton yue.chen@qmul.ac.uk yuanwei.liu@qmul.ac.uk December 12th, 2017 1 / 24 Outline 1 Overview and Motivation 2 Basic Principles of NOMA 3 NOMA Combined with Multiple Antennas. 1 Cache-Aided Non-Orthogonal Multiple Access for 5G-Enabled Vehicular Networks Sanjeev Gurugopinath, Member, IEEE, Paschalis C. Sofotasios, Senior Member, IEEE, Yousof Al-Hammadi, Member, IEEE, and Sami Muhaidat, Senior Member, IEEE Abstract—The increasing demand for rich multimedia services and the emergence of the Internet-of-Things (IoT) pose challeng As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for 3GPP LTE and is envisioned to be an essential component of 5G mobile networks. The key feature of NOMA is to serve multiple users at the same time/frequency/ code, but with different power levels, which yield

(5G) networks face challenges in terms of supporting large- After decades of evolution, the classic orthogonal multiple-access (OMA) schemes, such as time-division multiple-access (TDMA) Street, frequency-division multiple OMA/nonorthogonal multiple-access (NOMA) Square of Fig. 1. They have also evolved further along spatial. Non-orthogonal multiple access (NOMA) being the frontier multiple access scheme for 5G, there exists numerous research attempts on enhancing the energy efficiency of NOMA enabled wireless networks while maintaining its outstanding performance metrics such as high throughput, dat As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for 3GPP LTE and is envisioned to be an essential component of 5G mobile networks. The key feature of NOMA is to serve multiple users at the same time/frequency/ code, but with different power levels, which yields a significant. Zhu L, Zhang J, Xiao Z, Cao X, Wu DO, Xia X-G (2019) Joint Tx-Rx beamforming and power allocation for 5G millimeter-wave non-orthogonal multiple access (MmWave-NOMA) networks. IEEE Trans Commun 20:20. Google Scholar 21. Thornburg A, Bai T, Heath RW Jr (2016) Performance analysis of outdoor mmWave ad hoc networks

NOMA in 5G Systems: Exciting Possibilities for Enhancing

A MANUSCRIPT SUBMITTED TO THE IEEE COMMUNICATIONS MAGAZINE 1 Application of Non-orthogonal Multiple Access in LTE and 5G Networks Zhiguo Ding, Yuanwei Liu, Jinho Choi, Qi Sun, Maged Elkashlan, Chih-Lin I and H. Vincent Poor Abstract arXiv:1511.08610v2 [cs.IT] 31 Oct 2016 As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for. Non-orthogonal multiple access (NOMA) has been considered a key technology to address the increasing traffic demands for fifth-generation (5G) cellular wireless communication networks and internet of things Non-Orthogonal Multiple Access for 5G in Special Issue Posted on December 24, 2016 . Information for the Special Issue. Submission Deadline: 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 A combination of Non-Orthogonal Multiple Access (NOMA) and Universal Filtered Multi-Carrier (UFMC) is found suitable for downlink scenario. We propose NOMA-UFMC-based Radio Access (NOMURA) scheme, which is asynchronous, bandwidth efficient and provides higher throughput The paper entitled A Tutorial on Non-Orthogonal Multiple Access (NOMA) for 5G and Beyond by M. Aldababsa et al. provides a unified model for NOMA, including uplink and downlink transmissions, along with the extensions to multiple input multiple output and cooperative communication scenarios. The authors compare the performances of.

Explaining NOMA basic concept, how is it different from

NOMA vs OFDMA difference between NOMA and OFDMA 5

  1. Uplink Non-Orthogonal Multiple Access for 5G Wireless Networks Mohammed Al-Imari, Pei Xiao, Muhammad Ali Imran, and Rahim Tafazolli Centre for Communication Systems Research University of Surrey Guildford, GU2 7XH, United Kingdom Email:{m.al-imari, p.xiao, m.imran, r.tafazolli}@surrey.ac.uk Abstract—Orthogonal Frequency Division Multiple Access users can use resources simultaneously, which.
  2. Abstract. Non-orthogonal multiple access (NOMA) was originally proposed as a multiuser access technique for radio frequency (RF) cellular networks. In this chapter, we discuss the application of NOMA to visible light communication (VLC) networks, also referred to as light fidelity (LiFi), as part of the more general field of optical wireless.
  3. of modulations have also been proposed specifically for 5G networks. For example, to deal with high Doppler spread in eV2X scenarios, transmit data can be modulated in the delay-Doppler domain [19]. The above modulations can be used with orthogonal multiple access (OMA) in 5G networks
  4. Energy efficiency is a major concern in the emerging mobile cellular wireless networks since massive connectivity is to be expected with high energy requirements from the network operators. Non-orthogonal multiple access (NOMA) being the frontier multiple access scheme for 5G, there exists numerous research attempts on enhancing the energy.
  5. In the beyond 5G networks, extraordinary demands for data rates and capacity are to be met. A possible candidate to address these challenges is Non-Orthogonal Multiple Access (NOMA) technique, which leads to higher diversity gains and massive connectivity

Analysis of Non-Orthogonal Multiple Access (NOMA) for 5G

  1. Abstract: With the increasing demand for high-speed mobile transmissions for 5G networks, the cooperative relay-aided non-orthogonal multiple access (CR-NOMA) has been highly considered. An efficient and reliable CR-NOMA not only depends on the network mechanism but on the network coding strategy at the relay
  2. Full-duplex (FD) has the potential to double the resource utilization of cellular networks by enabling simultaneous transmissions in the uplink (UL) and downlink (DL) directions using the same time and frequency resource. Several challenges arise from integrating FD with non-orthogonal multiple access (NOMA) networks
  3. 2. Non-orthogonal multiple access (NOMA) We consider orthogonal frequency division multiplexing (OFDM) as the modulation scheme and NOMA as the multiple access scheme. In conventional 4G networks, as natural extension of OFDM, orthogonal frequency division multiple access (OFDMA) is used where information for each user is assigned to a subset.
  4. ent green usage of Wi-Fi range in upco

Uplink non-orthogonal multiple access for 5G wireless

key features chacracterizing 5G, non-orthogonal multiple access (NOMA) is one of the promising technologies, that are expected to address the targets of 5G wireless communications, including high spectral efficiency, massive connectivity, and lo In fact, this non-orthogonal concept is a generalized framework of recently proposed different multiple access schemes for 5G and beyond wireless networks such as power-domain NOMA, sparse code multiple access, lattice partition multiple access, multi-user shared access, and pattern division multiple access ABSTRACT:Many multiple access techniques have emerged based on the technology used in mobile devices. In this paper a brief description of the multiple access techniques used from 1G to 5G is given and finally a detailed overview of the latest Non Orthogonal Multiple Access technique (NOMA) for 5G is presented

Application of Non-Orthogonal Multiple Access in LTE and

Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The key idea behind NOMA is to serve multiple users in the same resource block, such as a time slot, subcarrier, or spreading code. The NOMA. Non-orthogonal multiple access (NOMA) has received tremendous attention for the design of radio access techniques for fifth generation (5G) wireless networks and beyond. The basic concept behind NOMA is to serve more than one user in the same resource block, e.g., a time slot, subcarrier, spreading code, or space. With this, NOMA promotes massive connectivity, lowers latency, improves user. non-orthogonal multiple access (NOMA), is dis-cussed, which can address some of these chal-lenges for 5G. Different from conventional orthogonal multiple access technologies, NOMA can accommodate much more users via non-orthogonal resource allocation. We divide exist-ing dominant NOMA schemes into two categories: power-domain multiplexing an The non-orthogonal multiple access (NOMA) technique has been well recognized as an effective solution for the future 5G cellular networks to provide broadband communications and massive connectivity. In this article, we investigate the applicability of NOMA in supporting cellular V2X services to achieve low latency and high reliability Non-Orthogonal Multiple Access for 5G Systems in Special Issue Posted on December 24, This special issue will provide a forum for the latest research and innovations in NOMA technologies as well as their applications, and will bridge the gap between theory and practice in the design of 5G multiple access. Physical Layer Security for 5G.

(PDF) Application of Non-Orthogonal Multiple Access in LTE

Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for performance enhancement in next-generation cellular communications. Compared to orthogonal frequency divisi.. Non-orthogonal multiple access (NOMA) has been con-ceived as a breakthrough technology in the fifth generation (5G) networks because of its superior spectral efficiency [1, 2]. It is pointed that NOMA has the potential to integrate well with existing multiple access (MA) paradigms [3] as it exploits a new dimension, the power domain, which mean Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The key idea behind NOMA is to serve multiple users in the same resource block, such as a time slot, subcarrier, or spreading code

Multiple Access Techniques for 5G Wireless Networks and Beyond. Includes orthogonal and non-orthogonal waveforms for 5G new radio and beyond: CP-OFDM, UF-OFDM, f-OFDM, WOLA, FBMC, and GFDM. Features NOMA via the power domain (fundamentals, clustering, power allocation, experimental trials, etc.) and the code and other domains (SCMA, IDMA, LDS. Non-orthogonal multiple access (NOMA) is promoted as one of the promising technologies to be adopted in 5G cellular networks. In contrast to conventional orthogonal multiple access (OMA), NOMA is foreseen to increase the network capacity by improving the spatial utilization of the scarce spectrum. Conventionally, temporal, spectral, and/or spatia networks have received considerable attention [1]. Non-orthogonal multiple access (NOMA) is considered to be a potential candidate for 5G multiple access (MA) [2-4]. NOMA is fundamentally different from conventional orthogonal MA schemes, where multiple users are multiplexed in the same time domain, frequenc

A Tutorial on Nonorthogonal Multiple Access for 5G and Beyon

  1. Due to its superior spectral efficiency, non-orthogonal multiple access (NOMA) is considered as a promising technology for the future wireless networks (5G) [1-6]. The NOMA technique allows multiple users to overload the same wireless resources by utilising the superposition coding principle, so that NOMA can enlarge the.
  2. Driven by the rapid growth of mobile network and Internet of Things (IoT), future wireless networks anticipate an explosive demand for massive connectivity over limited radio resources. To this end, a number of energy and spectrally efficient technologies have been proposed, including massive multiple-input multiple-output (MIMO), millimeter wave communications, ultra-dense networks, and non.
  3. Nonorthogonal multiple access (NOMA) is one of the capable contenders to achieve the vision of 5G wireless communications. Supporting a higher number of users than available orthogonal resources is the key feather of NOMA. In this article, the basic principle of NOMA has been reviewed and compared with other orthogonal multiple access (OMA)
  4. A. S. Marcano and H. L. Christiansen, Performance of non-orthogonal multiple access (NOMA) in mmWave wireless communications for 5G networks, in 2017 International Conference on Computing, Networking and Communications (ICNC), Santa Clara, CA, USA, 2017
  5. [1]. Particularly non-orthogonal multiple access (NOMA) has been recognized as a promising multiple access techniques for 5G networks due to its superior spectral efficiency [2]. In this letter, the performance of NOMA is investigated in a downlink network with randomly deployed mobile users. In particular, the performance of NOMA is evaluated.
  6. T1 - Multiple access techniques for 5G wireless networks and beyond. AU - Vaezi, Mojtaba. AU - Ding, Zhiguo. The book is an all-encompassing treatment of these areas addressing orthogonal multiple access and waveform design, non-orthogonal multiple access (NOMA) via power, code, and other domains, and orthogonal, non-orthogonal, and grant.
  7. This dissertation is composed of two parts. The first presents several approaches to enhance the performance of 5G wireless systems by using NOMA (Non-Orthogonal Multiple Access) as the multiple access technique under different scenarios and performance metrics. The second investigates the performance of a wireless system network using a mobility model to evaluate the channel capacity taking.
Non orthogonal multiple access

Non-Orthogonal Multiple Access (NOMA) Training is a future 5G Technology (5th generation wireless systems or mobile networks using non-orthogonal multiple access) that covers the next major phase of wireless and mobile telecommunications standards beyond the current 4G/IMT-Advanced standards with a focus on novel NOMA modulation and coding. As a key candidate technique for fifth-generation (5G) mobile communication systems, non-orthogonal multiple access (NOMA) has attracted considerable attention in the field of wireless communication. Successive interference cancellation (SIC) is the main NOMA detection method applied at receivers for both uplink and downlink NOMA transmissions

Non Orthogonal Multiple Access is a likely candidate in the line of succession for these technologies. NOMA goes against the present trend of transmitting information in orthogonal carriers or subcarriers. Here, the multiple users are multiplexed in the power domain, either in downlink or the uplink. In the downlink version, the Base Station. Non-orthogonal multiple access (NOMA) has been considered a key technology to address the increasing traffic demands for fifth-generation (5G) cellular wireless communication networks and internet of things. The NOMA technique offers efficient bandwidth utilisation, low latency, and support for the massive connectivity of devices in 5G networks research challenges regarding NOMA in 5G and beyond are also discussed. Index Terms—Non-orthogonal multiple access (NOMA), multi-carrier NOMA, MIMO, cooperative NOMA, millimeter-wave networks. I. INTRODUCTION N ON-ORTHOGONAL multiple access (NOMA) has become an important principle for the design of radi This paper propose a Modulation based Non Orthogonal Multiple Access (M-NOMA) and Modulation based cooperative NOMA (CM-NOMA) which greatly enhances the performance of existing NOMA. There are multiple techniques which offer stability and perfection of NOMA. M-NOMA is such a scheme which makes it one of the technique which is a better adoption in 5G communication systems As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for 3GPP LTE and is envisioned to be an essential component of 5G mobile networks. The key feature of NOMA is to serve multiple users at the same time/frequency/ code, but with different power levels, which yields a significant spectral efficiency gain over conventional.

Power-domain non orthogonal multiple access (PD-NOMA) inElectronics | Free Full-Text | Energy Efficient PowerNon-Orthogonal Multiple Access for 5G and Beyond | DeepAICR-NOMA architectures

Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth-generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The key idea behind NOMA is to serve multiple users in the same resource block, such as a time slot, subcarrier, or spreading code 8 Conclusion. In this article, we have discussed the working principle, key advantages and performance benefits of the non-orthogonal multiple access (NOMA), which is recognized as one of the promising feature for 5G communication systems. Different types of NOMA systems, which can be largely classified under the power-domain NOMA (PD-NOMA) and. It is recalled that non-orthogonal multiple access (NOMA) has been recently proposed as a promising multiple access solution to address some of the challenges in 5G networks ([11, 12, 13, 14]).In particular, NOMA is envisioned to increase the system throughput and to support massive connectivity Hybrid Generalized Non-Orthogonal Multiple Access for the 5G Wireless Networks Masters Thesis Samson Manyani Zitha A thesis submitted in fulfilment of the requirement for the degree of MASTERS OF SCIENCE IN ENGINEERING (COMPUTER ENGINEERING) School of Electrical, Electronic & Computer Engineering Durban South Africa Thesis submitted December, 201 Non-orthogonal multiple access (NOMA) is intended to be used for the next generation 5G cellular networks. In this paper, the expressions for the channel capacities for symmetric and asymmetric NOMA networks have been analysed. The performance measure of user spectral efficiency and the sum-rate bounds, for the NOMA and the existing orthogonal multiple access (OMA) networks have been compared