Users' Power Multiplexing Limitations in NOMA System over Gaussian Channel (original) (raw)

Non-Orthogonal Multiple Access in 5G

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...

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

In orthogonal multiple access schemes, efficiency of network is affected by using orthogonality phenomena. For example, in FDMA, the spectrum is divided into channels and each two channels are separated by guard bands, thus the guard band bandwidth is not utilized. In Non-Orthogonal Multiple Access (like Power Domain-NOMA), each user is provided different power levels while using same frequency, time or code. Thus, efficiency is increased. In this paper, we will analyze NOMA for future use with different implementation techniques. .

The Performance Evaluation of NOMA for 5G Systems

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.

Efficient power allocation method for non orthogonal multiple access 5G systems

International Journal of Electrical and Computer Engineering (IJECE), 2020

One of the hot research topics for the upcoming 5G (fifth-generation) wireless communication networks is the non orthogonal multiple access (NOMA) systems, where it have attracted both industrial and academic fields to improve the existing spectral efficiency. In fact, the multiuser detection process for NOMA systems is largely affected by the power distribution of the received signals. In this paper, a new method has been proposed to control the transmit power among active users in one of the promising NOMA systems; the interleave division multiple access (IDMA) which has been adopted here for consideration. Unlike conventional methods, where tedious mathematical computations are required; a simple and direct method has been derived. The proposed method has been applied to IDMA system with different FEC codes. The obtained results show that the proposed method outperforms the conventional one as compared to optimal results.

An Improved Resource Allocation Scheme for 5G NOMA System

ATBU Journal of Science, Technology and Education, 2019

As a result of increasing demand on telecommunications services, networks suffer low speed and high latency. These seriously affect the performance of the network due to the presents of high burden on the existing multiplexing techniques such as Orthogonal Multiple Access (OMA) to deliver high speed data rates. Hence, the ever increasing demand for high speed and low latency data communications by mobile users define future features of networks to ease the burden on the existing multiple access techniques by significantly offering high data rates through multiplexing of multiple users over the same channel at the same time and frequency using Non Orthogonal Multiple Access (NOMA) in 5G systems. The research developed an improved resources allocation scheme for NOMA fifth Generation (5G) systems. The multiplexing of users on the same frequency band in NOMA makes it possible to have higher sum rate than the conventional OMA technique. This high sum rate can only be guaranteed through ...

Application of Non-orthogonal Multiple Access in LTE and 5G Networks

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.