Performance Analysis of NOMA in 5G Systems With HPA Nonlinearities

Belkacem, Oussama Ben Haj; Ammari, Mohamed Lassaad; Dinis, Rui

doi:10.1109/access.2020.3020372

Cited by 18 publications

(12 citation statements)

References 20 publications

(28 reference statements)

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“…For all cases, the NOMA systems can achieve a better bit error rate (BER) and ergodic rate than the OMA systems. Similar statements were derived when nonlinear high-power amplifiers 28 and mobile edge computing with imperfect channel state information were studied. 29 Although these basic analysis approaches and some interesting results were presented in previous research works, the works did not study the impact of the power loss, particularly distance from the user to its serving BS, on the user performance.…”

Section: Introductionsupporting

confidence: 60%

“…Compared to previous works, the findings on UE capacity and ASE in the NOMA systems can be summarized as follows: Finding 1: UE capacity under the bad channel conditions experiences a slower decline than in other environments. In the literature, the related research works 27‐29 only did not take the power loss into the performance analysis. Thus, the effects of transmission environments on the UE performance have not been derived. Finding 2: The NOMA technique only can significantly improve ASE in the case of bad channel conditions.…”

Section: Simulation and Discussionmentioning

confidence: 99%

“…In the literature, the related research works [27][28][29] only did not take the power loss into the performance analysis. Thus, the effects of transmission environments on the UE performance have not been derived.…”

Section: Area Spectral Efficiencymentioning

confidence: 99%

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Uplink performance of nonorthogonal multiple access ultradense networks with power control

Lam¹,

Hiep

Tran

2022

Int J Communication

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Summary This paper studies power control in ultradense networks which are potential network models of 5G cellular systems. The power control model that bases on stretched path loss model (SPLM) is introduced to allow each user to proactively adjust its transmission power to adapt to power loss and network status. The moment‐generating function (MGF) is utilized through the paper to analyze the uplink coverage probability (UCP) in which it is assumed that the base station (BS) of interest does not have information about fast fading of interfering channels. The analytical results indicate that the proposed power control model can reduce user power consumption while maintaining the UCP. Two interesting facts have been stated when comparing the performance of the networks in good and bad channel conditions. First, the user equipment (UE) in bad channel conditions outperforms others in good channel conditions. Second, the deployment of nonorthogonal multiple access (NOMA) technique can significantly improve the area spectral efficiency (ASE) in bad channel conditions.

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Section: Introductionsupporting

confidence: 60%

Section: Simulation and Discussionmentioning

confidence: 99%

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Uplink performance of nonorthogonal multiple access ultradense networks with power control

Lam¹,

Hiep

Tran

2022

Int J Communication

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“…Also, [37] analyzed the steady-state packet loss and delay violation probability in URLL NOMA-based communications with saturated traffic model, and predefined SIC ordering. Furthermore, [38] studied the outage probability and ergodic sum-rate in NOMA 5G systems with nonlinear high-power amplifiers and an arbitrary number of users in a NOMA cluster; however, with saturated data traffic and fixed SIC ordering. A joint user association and decoding order selection scheme for distributed UL NOMA has been studied in [39], where the outage probability has been derived for a 2-user NOMA cluster with saturated data traffic.…”

Section: B Motivation and Contributionsmentioning

confidence: 99%

Performance Analysis of Grant-Free Random-Access NOMA in URLL IoT Networks

Amini

Baidas

2021

IEEE Access

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Internet-of-Things (IoT) networks have recently emerged to provide massive connectivity for many application scenarios and services. Additionally, developing spectrum-access strategies for a large number of nodes with sporadic data traffic behaviors in IoT networks has attracted much attention recently. However, developing such strategies becomes more challenging when ultra-reliable low-latency (URLL) transmissions are required. As IoT networks entail spectrum-efficient transmission schemes, non-orthogonal multiple-access (NOMA) has emerged as a key enabler for such networks. On the other hand, grant-free random-access (RA) techniques are particularly promising for high spectral-efficiency and massive connectivity, since they reduce signaling overhead, and packet latency. Therefore, in this paper, uplink RA-NOMA IoT networks with clustered IoT devices is studied, where short packet and diversity transmissions are adopted to meet the URLL requirements. To reduce the negative effect of diversity transmission on packet latency, multiple replicas of packets are accommodated within different resource blocks (RBs) in the same transmission time interval (TTI). The analytical expressions of network metrics, namely, average packet latency, reliability, and GoodPut are derived. Furthermore, the effect of the number of packet replicas, blocklength, and cluster size on the network metrics is evaluated. Finally, the analytical derivations are utilized to find the optimal values for the number of packet replicas, blocklength, and power control parameters, such that the network GoodPut is maximized, subject to URLL constraints.INDEX TERMS Internet-of-Things, low-latency, NOMA, random-access, ultra-reliability. I. INTRODUCTIONFifth generation (5G) cellular networks have ignited numerous research areas since its introduction. The fundamental difference between 5G and the previous generations is that 5G is the driver for implementing two generic types of communications, namely, ultra-reliable low-latency communication (URLLC) and massive machine-type communication (mMTC) [1]. The combination of these two communication types along with the explosive and exponential growth in the number of smart devices, applications, and services is the advent of massive Internet-of-Things (mIoT) networks. This is in addition to the extensive emerging mission-critical applications and use cases, such as tactile Internet (involving remote motion control, tele-surgery, etc.), factory automation, Industrial IoT (IIoT), and those under the The associate editor coordinating the review of this manuscript and approving it for publication was Noor Zaman .

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“…In [40] a design of a receiver to deal with non-linear distortions is presented. In [41] show an evaluation of the performance of the NOMA scheme in terms of outage probability and BER. Finally, in [42], a precoding technique is proposed to decrease the high PAPR and carrier frequency offset effects.…”

Section: Introductionmentioning

confidence: 99%

Bit Error Rate Analysis of NOMA-OFDM in 5G Systems With Non-Linear HPA With Memory

et al. 2021

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The orthogonal frequency division multiplexing (OFDM) and the non-orthogonal multiple access (NOMA) scheme are presented as promising techniques to meet the requirement of fifth-generation (5G) communication systems. Although much attention has recently been devoted to study these techniques, some scenarios have still been less explored. Considering that a fundamental part of any communication system is the use of power amplifiers, this paper presents an analytical evaluation of the bit error rate (BER) of NOMA-OFDM systems in the presence of a high power amplifier (HPA) with memory. Considering that the non-linear distortions generated by the HPA can be modeled using a polynomial model with memory, new theoretical expressions are developed to obtain the BER of the system. Specifically, exact BER expressions for a downlink NOMA-OFDM system with two users are presented and verified by Monte Carlo simulation results. The obtained numerical results demonstrate that the performance degradation of both users is highly dependent on the non-linear distortions, even when the successive interference cancellation (SIC) technique is performed perfectly.INDEX TERMS 5G, bit error rate, high power amplifier, non-linearity, non-orthogonal multiple access, orthogonal frequency division multiplexing.

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Performance Analysis of NOMA in 5G Systems With HPA Nonlinearities

Cited by 18 publications

References 20 publications

Uplink performance of nonorthogonal multiple access ultradense networks with power control

Uplink performance of nonorthogonal multiple access ultradense networks with power control

Performance Analysis of Grant-Free Random-Access NOMA in URLL IoT Networks

Bit Error Rate Analysis of NOMA-OFDM in 5G Systems With Non-Linear HPA With Memory

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