Joint Power-Domain and SCMA-Based NOMA System for Downlink in 5G and Beyond

Sharma, Sanjeev; Deka, Kuntal; Bhatia, Vimal; Gupta, Anubha

doi:10.1109/lcomm.2019.2911082

Cited by 56 publications

(46 citation statements)

References 13 publications

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“…Hybrid multiple access: Few existing works tried to combine SCMA with other multiple access techniques [42]- [44]. Kim et al [42] proposed a hybrid system based on PD-NOMA and SCMA where near and far property of PD-NOMA is used to serve multiple users simultaneously.…”

Section: B Code-domain Nomamentioning

confidence: 99%

Sparse Code Multiple Access: Potentials and Challenges

Rebhi

Hassan

Raoof

et al. 2021

IEEE Open J. Commun. Soc.

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The massive connectivity is among other unprecedented requirements which are expected to be satisfied in order to follow the perpetual increase of connected devices in the era of internet of things. In contrast to the family of conventional orthogonal multiple access schemes, the key distinguishing feature of non-orthogonal multiple access (NOMA) is its capacity to support the massive connectivity. Sparse code multiple access (SCMA) is one of the powerful schemes of code-domain NOMA (CD-NOMA) and is among the promising candidates of multiple access techniques to be employed in future generations of wireless communication systems thanks to the sparsity pattern of its codebooks. This technique has been actively investigated in recent years. In this paper, we provide a comprehensive survey of the state-of-the-art of SCMA. First, we will pinpoint SCMA place in the NOMA landscape including power-domain NOMA and CD-NOMA with the aim of justifying why SCMA is prominent. Then, its system architecture is highlighted and its basic principles are presented, afterwards a review of exiting codebook designs and available SCMA detectors is provided, before showing how resources are expected to be assigned, and how SCMA can be combined with other existing and emerging technologies. Finally, we present a range of future research trends and challenging open issues that should be addressed to optimize SCMA performance.

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Section: B Code-domain Nomamentioning

confidence: 99%

Sparse Code Multiple Access: Potentials and Challenges

Rebhi

Hassan

Raoof

et al. 2021

IEEE Open J. Commun. Soc.

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“…SCMA codebooks are reused by multiple users employing power domain NOMA (PD-NOMA) to transmit signals non-orthogonally. A joint power domain and SCMA downlink system is also developed in [34]. MPA combined with SIC is implemented in the receiver.…”

Section: Related Workmentioning

confidence: 99%

Biological Resource Allocation Algorithms for Heterogeneous Uplink PD-SCMA NOMA Networks

Sefako

Walingo

2020

IEEE Access

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Due to their ability to multiplex users on a resource element (RE), Non-orthogonal multiple access (NOMA) techniques have gained popularity in 5G network implementation. The features of 5G heterogeneous networks have necessitated the development of hybrid NOMA schemes combining the merits of the individual NOMA schemes for optimal performance. The hybrid technologies on 5G networks make complex air interfaces resulting in new resource allocation (RA) and user pairing (UP) challenges aimed at limiting the multiplexed users interference. Furthermore, common analytical techniques for evaluating the performance of the schemes lead to unrealistic network performance bounds necessitating alternative schemes. This work explores the feasibility of a hybrid power domain sparse code non-orthogonal multiple access (PD-SCMA). The scheme integrates both power and code domain multiple access on an uplink network of small cell user equipments (SUEs) and macro cell user equipments (MUEs). Alternative biological RA/UP schemes; the ant colony optimization (ACO), particle swarm optimization (PSO) and a hybrid adaptive particle swarm optimization (APASO) algorithms, are proposed. The performance results indicate the developed APASO outperforming both the PSO and ACO in sum rate and energy efficiency optimization on application to the PD-SCMA based heterogeneous network.

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“…Hence, integrating NOMA with full duplexing can be beneficial in scenarios when full duplex base station served uplink and downlink users at the same time using same channel [62], when cooperative NOMA is applied using full duplex NOMA cell center users [35], and when relay assisted communication is performed users' channel gain difference and their distribution around base station motivates the use of a hybrid MA (HMA) system by combining the PD-NOMA and SCMA techniques. HMA enhances the spectral efficiency and accommodates a large number of users in the system as compared to the conventional PD-NOMA or SCMA for next-generation networks [64]. In HMA, both message passing algorithm (MPA) and SIC based method is used for detection [64].…”

Section: Noma With Fdmentioning

confidence: 99%

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

et al. 2020

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Two of the most challenging goals to be achieved in the fifth generation (5G) and beyond communication are massive connectivity and higher capacity. The use of traditional orthogonal multiple access techniques limits the number of users that can be served using the available resources due to orthogonality constraint. Moreover, the available resources may not be utilized effectively by the alloted users thereby resulting in inefficiency and user unfairness. This imposes a severe drawback in cases where the number of users to be served are high, like in the 5G networks. Hence, introducing non-orthogonality to the multiple access scheme is advocated as a supreme methodology to serve multiple users simultaneously, thereby enhancing the connectivity. In scenarios with massive number of users, non-orthogonal multiple access scheme increases the number of active connections by superimposing the signal of multi-users on a same resource block, thereby also utilizing the available resources efficiently.

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Joint Power-Domain and SCMA-Based NOMA System for Downlink in 5G and Beyond

Cited by 56 publications

References 13 publications

Sparse Code Multiple Access: Potentials and Challenges

Sparse Code Multiple Access: Potentials and Challenges

Biological Resource Allocation Algorithms for Heterogeneous Uplink PD-SCMA NOMA Networks

Non-orthogonal Multiple Access: An Enabler for Massive Connectivity

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