Spectral efficiency (SE) enhancement of NOMA system through iterative power assignment

Al-Abbasi, Ziad Qais; Khamis, Mustafa A.

doi:10.1007/s11276-020-02511-z

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…Several existing literature works, i.e., refs. [1,2,[4][5][6][7][8][9][10][11][12] have explored different aspects of NOMA potential and their outcomes have approved its effectiveness, especially against its orthogonal predecessors. NOMA has proven its vitality to be adapted as a future air interface as a stand-alone, or even in combination with existing techniques such as multi-input multi-output (MIMO) [6,13,14] and device-to-device (D2D) communications [4,15,16].…”

Section: Introductionmentioning

confidence: 99%

Multiple-Intelligent Reflective Surfaces (Multi-IRSs)-Based NOMA System

2022

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Recent research has introduced the notion of an Intelligent Reflective Surface (IRS) so as to boost the source–destination communication environment. IRS refers to a plane that consists of a number of passive elements that have a smaller size than the wavelength of the incident signal. Those elements use reflection to beam-form and to forward the incident radio signals toward the intended destination without power consumption. This article examines the performance of an IRS-based non-orthogonal multiple access (NOMA) system, and adopts the idea of using multiple IRS planes. It additionally investigates improving the performance of an IRS-NOMA combination through proposing various solutions that include optimizing the overall number of the IRS elements as a first step. After that, a closed form expression is derived for the considered IRS-NOMA system to determine the optimal number of the reflective elements. Secondly, the paper utilizes a new approach termed as multiple-IRS-based NOMA. This encompasses using multiple reflective planes (multi-IRS) along with IRS-NOMA, to boost the received signal characteristics, especially in situations where it is there a weak or no direct link between the source and the destination. An energy efficiency-spectral efficiency (EE-SE) trade-off is likewise presented, so as to have a complete view of the IRS-NOMA performance, along with the proposed solutions. The obtained simulation results depicts that IRS-NOMA is better than the existing orthogonal techniques. In addition, the results confirm that exploiting multiple IRSs offers a considerable gain in performance, as it enhances the conditions of the propagation environment. In specific, the considered case of a two IRS surfaces-assisted NOMA system offers higher performance levels than the case of a single IRS surface-assisted NOMA system.

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Section: Introductionmentioning

confidence: 99%

Multiple-Intelligent Reflective Surfaces (Multi-IRSs)-Based NOMA System

2022

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“…Non-orthogonal multiple access (NOMA) has emerged as a candidate air-interface technology in order to provide robust network connectivity, meet high traffic demand, maintain high spectral efficiency and capacity, for the fifth-generation (5G) and beyond (5GB) cellular networks. NOMA provide power domain multiplexing among the communicating users through superposition coding and allows them to share the whole radio spectrum to amplify the overall spectral efficiency [1][2][3]. Sharing the whole bandwidth is the main difference between NOMA and its orthogonal counterparts that allocates each user with part of the available radio subcarriers [4].…”

Section: Introductionmentioning

confidence: 99%

The Impact of User-Pairing on the Performance of Non-Orthogonal Multiple Access (NOMA) System

Abdulkareem¹,

Al-Abbasi²,

Ghazal³

et al. 2022

DJES

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Non-orthogonal multiple access (NOMA) is being considered as a candidate to meet the expected traffic demand growth in 5G and beyond 5G (5GB) networks. Due to the complexity of applying multiuser detection at the NOMA receiver, a number of works have suggested applying user-pairing to simplify dealing with all users as a whole. This paper addresses the effect of applying user-pairing on the performance of NOMA assisted system in general proposes three different user pairing approaches to examine which one is best for boosting the performance of multiuser NOMA system and making it reaches its potential. This paper evaluates the performance of NOMA system with organized (uniform), random, and distance-based user pairing schemes. Simulation results show that the organized pairing assisted NOMA scheme offers the best performance as compared to its pairing peer techniques in terms of the overall sum rate and the energy efficiency.

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Section: Introductionmentioning

confidence: 99%

“…DPA based metaheuristic optimization methods are iterative methods that increase implementation complexity as well as conventional DPA numerical search methods. For instance, DPA based DE 49 has been compared with GRPA, DPA based PSO 50 has been compared with NGDPA and GRPA, while DPA based GA has been compared with FTPA 51 and GRPA. 52 As can be seen from the related works given above, no comprehensive and realistic comparison of various DPA strategic design methods has yet been published, taking into account the BER, sum-rate capacity, fairness, and distance between the users.…”

Section: Introductionmentioning

confidence: 99%

On The Selection of Power Allocation Strategy in Power Domain Non‐Orthogonal Multiple Access (PD‐NOMA) for 6G and Beyond

Mounir

Mashade

Aboshosha

2021

Trans Emerging Tel Tech

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Non-orthogonal multiple access (NOMA) is an attractive candidate for 6G networks to support ultra-massive machine-type communications (umMTC). Power domain NOMA (PD-NOMA) is the simplest type of NOMA, which assigns a different power level to each user. Power allocation in PD-NOMA can be classified into fixed/dynamic power allocation (FPA/DPA). FPA is simple, but DPA is more suitable for the mobile environment than FPA. However, finding optimum power per each user in DPA is extremely complex. Fortunately, many DPA strategic design methods were introduced in literature as simple suboptimal solutions of DPA. Therefore, DPA strategic design methods and FPA techniques are simple approaches to implement PD-NOMA in 6G and beyond. In literature, no previous work had compared the performances of all DPA strategic design methods, nor FPA techniques, to ease the selection of a simple strategy for PD-NOMA in 6G. Motivated by that, this work compares performances of all DPA strategic design methods as well as FPA techniques, in terms of sum-rate capacity, fairness, and bit error rate (BER). Results showed that the best DPA strategic design method and the best FPA technique have comparable performance.

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Spectral efficiency (SE) enhancement of NOMA system through iterative power assignment

Cited by 13 publications

References 30 publications

Multiple-Intelligent Reflective Surfaces (Multi-IRSs)-Based NOMA System

Multiple-Intelligent Reflective Surfaces (Multi-IRSs)-Based NOMA System

The Impact of User-Pairing on the Performance of Non-Orthogonal Multiple Access (NOMA) System

On The Selection of Power Allocation Strategy in Power Domain Non‐Orthogonal Multiple Access (PD‐NOMA) for 6G and Beyond

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