A Survey on Non-Orthogonal Multiple Access for 5G Networks: Research Challenges and Future Trends

Ding, Zhiguo; Lei, Xianfu; Karagiannidis, George K.; Schober, Robert; Yuan, Jinhong; Bhargava, V.K.

doi:10.1109/jsac.2017.2725519

Cited by 1,982 publications

(1,131 citation statements)

References 132 publications

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“…Note that most the existing survey papers on NOMA [5]- [10] only focus on the subclass of power-domain NOMA schemes, even though the NOMA family is significantly broader. Some code-domain NOMA schemes are briefly introduced in [11] and [12]. By contrast, in this paper, both power-domain NOMA and codedomain NOMA, as well as the entire broad family of NOMA schemes proposed as part of the Rel-14 3GPP NR Study Item shown in Table I are introduced to provide a more comprehensive timely review.…”

Section: Introductionmentioning

confidence: 99%

A Survey of Non-Orthogonal Multiple Access for 5G

Dai

Wang

Ding

et al. 2018

IEEE Commun. Surv. Tutorials

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Abstract-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.

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Section: Introductionmentioning

confidence: 99%

A Survey of Non-Orthogonal Multiple Access for 5G

Dai

Wang

Ding

et al. 2018

IEEE Commun. Surv. Tutorials

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623

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“…If Successive Interference Cancellation (SIC) [10,11,18,29] is deployed in VLC receivers, the NOMA-VLC typical scenario is a single cell with interuser interference. Hence, according to the conditions of ISI, the achievable data rate of NOMA-VLC users for the k-th user can be approximately indicated as (10), where the Euler number e and π are the determined values.…”

Section: User Data Rate Boundmentioning

confidence: 99%

“…However, GRPA problems in NOMA-VLC [29] networks have not yet been solved. In view of the difficulty of obtaining a generalized GRPA solution, the method of numerical search has the shortcoming of expensive computing, but using such strategies is convenient for real-time processing.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of gain ratio power allocation strategies for non-orthogonal multiple access in indoor visible light communication networks

Tao

et al. 2018

J Wireless Com Network

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Non-orthogonal multiple access (NOMA) is a promising method for enhancing the throughput in visible light communication (VLC) networks. In NOMA, signal power domain control, called gain ratio power allocation (GRPA), can significantly improve the user sum rate with full-time frequency resource utilization. In indoor NOMA-VLC networks, the scenario in which users are covered by VLC illuminants on the ceiling is typical. First, this paper proposes a novel GRPA strategy for a single VLC cell. Second, due to the difficulty of direct comparisons between our and previously reported GRPA strategies, this paper presents an alternative lower bound for comparability. Third, in two-and threeuser cases, this paper analytically demonstrates that our NOMA-VLC GRPA strategy outperforms the aforementioned strategy, when successive interference cancellation (SIC) is used. Moreover, in the multi-user case, experimental results show that the average user data rate (AUDR) of multi-user cases under our strategy is better than that under the previous strategy. Finally, our paper provides both analytic and numerical results to prove that VLC single-cell system throughput under our strategy is better than that under the previous strategy. The proposed alternative lower bound is also proved to fit the original NOMA-VLC GRPA target asymptotically based on indoor VLC channels. Furthermore, to achieve the same AUDR, our strategy supports worse received conditions than does the previous strategy.

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“…To guarantee the fairness among NOMA users, more power is required for users with poor channel conditions and less power for users with better channel conditions [8]. However, if the users have similar channel conditions, OMA can guarantee better fairness and conventional power domain NOMA cannot strictly guarantee the users' quality of service (QoS) targets [9], which could be critical for some scenarios with strict fairness constraints.…”

Section: Introductionmentioning

confidence: 99%

NOMA for Multinumerology OFDM Systems

Abusabah

Arslan

2018

Wireless Communications and Mobile Computing

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Nonorthogonal multiple access (NOMA) is a promising technique which outperforms the traditional multiple access schemes in many aspects. It uses superposition coding (SC) to share the available resources among the users and adopts successive interference cancelation (SIC) for multiuser detection (MUD). Detection is performed in power domain where fairness can be supported through appropriate power allocation. Since power domain NOMA utilizes SC at the transmitter and SIC at the receiver, users cannot achieve equal rates and experience higher interference. In this paper, a novel NOMA scheme is proposed for multinumerology orthogonal frequency division multiplexing system, that is, different subcarrier spacings. The scheme uses the nature of mixed numerology systems to reduce the constraints associated with the MUD operation. This scheme not only enhances the fairness among the users but improves the bit error rate performance as well. Although the proposed scheme is less spectrally efficient than conventional NOMA schemes, it is still more spectrally efficient than orthogonal multiple access schemes.

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A Survey on Non-Orthogonal Multiple Access for 5G Networks: Research Challenges and Future Trends

Cited by 1,982 publications

References 132 publications

A Survey of Non-Orthogonal Multiple Access for 5G

A Survey of Non-Orthogonal Multiple Access for 5G

Performance analysis of gain ratio power allocation strategies for non-orthogonal multiple access in indoor visible light communication networks

NOMA for Multinumerology OFDM Systems

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