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

International Journal of Integrated Engineering

This paper highlights the fundamentals of the strong candidate Power Domain Non-Orthogonal Multiple Access (PD-NOMA) technique, and how it can best fit the requirements of fifth Generation (5G) in practical applications. PD-NOMA ensures flexibility in radio resource to improve user's access performance. Multiple users share the same radio resources in PD-NOMA, and therefore better spectrum efficiency can be achieved. The practical system design aspects of PD-NOMA are considered in this paper by exploring different network scenarios. Optimal performances of PD-NOMA system can be obtained by suitable power allocation schemes, with reduce the computational complexity, and advanced user pairing strategy. Theoretical formulation and solutions are also explained prior to the concept of downlink PD-NOMA. Challenges and future research windows are discussed before conclusion of this paper.

The increasing demand of mobile Internet and the IoTs poses exacting requisites for 5G wireless communications, like high spectral efficiency. Hence, a promising technology, non-orthogonal multiple access (NOMA), is discussed. Unlike standard orthogonal multiple access technologies, NOMA can serve much more users via non-orthogonal resource allocation. The most striking attribute of NOMA is to serve multiple users at the same time/frequency/code, but with different power levels, which produces a remarkable spectral efficiency gain. There are mainly two types of NOMA techniques, power-domain and code-domain. This paper primarily focuses on power-domain NOMA that utilizes superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver. Also, this paper discusses how NOMA performs when it is combined with other wireless communication techniques, for example cooperative communications, multiple-input multiple-output (MIMO). Furthermore, this p...

INTL JOURNAL OF ELECTRONICS AND TELECOMMUNICATIONS,, 2022

Non-Orthogonal Multiple Access (NOMA) in the fifth generation (5G) system is one of the optimistic technologies for wireless radio access networks. Compared to orthogonal multiple accesses (OMA) reduce the spectral efficiency; NOMA provides the best solution by increasing the data rates. This study evaluates NOMA with a downlink in the automatic deployment of multiusers. The outage performance and ergotic sum-rate gain give the NOMA better performance can be concluded at the final results. NOMA provides the Quality of Service (QoS) to the multi-users by considering the power allocation and data rate factors. Here is considered the outage probability will be 1 when it identifies the different user and allocates the data rate and power.

IEEE Communications Surveys and Tutorials, 2018

In the 5th generation (5G) of wireless communication systems, hitherto unprecedented requirements are expected to be satisfied. As one of the promising techniques of addressing these challenges, non-orthogonal multiple access (NOMA) has been actively investigated in recent years. In contrast to the family of conventional orthogonal multiple access (OMA) schemes, the key distinguishing feature of NOMA is to support a higher number of users than the number of orthogonal resource slots with the aid of non-orthogonal resource allocation. This may be realized by the sophisticated inter-user interference cancellation at the cost of an increased receiver complexity. In this article, we provide a comprehensive survey of the original birth, the most recent development, and the future research directions of NOMA. Specifically, the basic principle of NOMA will be introduced at first, with the comparison between NOMA and OMA especially from the perspective of information theory. Then, the prominent NOMA schemes are discussed by dividing them into two categories, namely, power-domain and code-domain NOMA. Their design principles and key features will be discussed in detail, and a systematic comparison of these NOMA schemes will be summarized in terms of their spectral efficiency, system performance, receiver complexity, etc. Finally, we will highlight a range of challenging open problems that should be solved for NOMA, along with corresponding opportunities and future research trends to address these challenges.

As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been recently proposed for 3GPP Long Term Evolution (LTE) and envisioned to be an essential component of 5th generation (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 orthogonal MA. This article provides a systematic treatment of this newly emerging technology, from its combination with multiple-input multiple-output (MIMO) technologies, to cooperative NOMA, as well as the interplay between NOMA and cognitive radio. This article also reviews the state of the art in the standardization activities concerning the implementation of NOMA in LTE and 5G networks.

IEEE Communications Surveys & Tutorials, 2017

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 division multiple access (OFDMA), which is a well-known high-capacity orthogonal multiple access (OMA) technique, NOMA offers a set of desirable benefits, including greater spectrum efficiency. There are different types of NOMA techniques, including power-domain and code-domain. This paper primarily focuses on power-domain NOMA that utilizes superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver. Various researchers have demonstrated that NOMA can be used effectively to meet both network-level and user-experienced data rate requirements of fifth-generation (5G) technologies. From that perspective, this paper comprehensively surveys the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMA. In addition, this paper discusses how NOMA performs when it is integrated with various proven wireless communications techniques, such as cooperative communications, multiple-input multiple-output (MIMO), beamforming, space-time coding, and network coding, among others. Furthermore, this paper discusses several important issues on NOMA implementation and provides some avenues for future research.

2019

Non orthogonal multiple access or NOMA as it is known is one of the most promising multiple access techniques which is being developed for 5G networks. It has been shown through various research that NOMA provides better throughput and spectrum utilization than present existing techniques. NOMA can be classified broadly into two types power domain and code domain. This paper focuses on the implementation challenges that NOMA presents. Keywords—Code-Domain NOMA, Imperfect CSI, Powerdomain NOMA, Resource Allocation, SIC

Wiley 5G Ref, 2019

Due to massive connectivity and increasing demands of various services and datahungry applications, a full-scale implementation of the fifth generation (5G) wireless systems requires more effective radio access techniques. In this regard, non-orthogonal multiple access (NOMA) has recently gained ever-growing attention from both academia and industry. Compared to orthogonal multiple access (OMA) techniques, NOMA is superior in terms of spectral efficiency and is thus appropriate for 5G and Beyond. In this article, we provide an overview of NOMA principles and applications. Specifically, the article discusses the fundamentals of power-domain NOMA with single and multiple antennas in both uplink and downlink settings. In addition, the basic principles of code-domain NOMA are elaborated. Further, the article explains various resource allocation techniques such as user pairing and power allocation for NOMA systems; discusses the basic form of cooperative NOMA and its variants; and addresses several opportunities and challenges associated with the compatibility of NOMA with other advanced communication paradigms such as heterogeneous networks and millimeter wave communications.

International Journal of Computer Applications, 2020

Non-Orthogonal Multiple Access is a promising radio access system for execution redesign in bleeding edge cell correspondences. Still out from Symmetrical repeat division diverse access, which is an eminent high-limit even unique access methodology, it offers a great deal of appealing focal points, including increasingly noticeable range viability. Is different sorts of this techniques, including power-region and code-space. This paper focuses on a very basic level revolves around power-space NOMA that utilizes superposition coding at a transmitter and dynamic impedance crossing out at a authority. Various experts have displayed that NOMA is used effectively till meet both framework level and experienced data rate essentials of fifth-generation headways. Starting is of view, this paper in audits a continuous headway of NOMA in 5 Generation structures, looking over a tier limit examination, power task frameworks, goodness, and coordinating plans in NOMA. In addition, this paper discusses how NOMA performs when it is composed with various showed remote exchanges methodologies, for instance, pleasing trades, various data different yield (MIMO), pillar framing, space-time coding, and framework coding, among oars. In addition, this paper discusses a couple of critical issues on NOMA utilization and gives a couple of streets till future research.

Sensors

The purpose of this paper is to provide a high-level overview of the most important non-orthogonal multiple access (NOMA) protocols in 5G and 6G networks that incorporate code division within the context of 3GPP standardization. The article’s objective is also to look into and compare the various strategies that have been proposed as a solution to the issue of resource distribution to achieve high performance. Many different NOMA plans for 5G and 6G systems have been suggested by a multitude of businesses. NOMA is currently developing in two primary directions: one of them is with power division, and the other is with code division. During the process of standardization carried out by the 3GPP, the attention of the developers was concentrated in the second direction for the application of NOMA schemes in 5G and 6G systems. Hardware communication, also known as D2D communication, performs a significant role in the process of communication between devices. This will increase the effic...