User Pairing and Power Allocation Strategies for 3D VLC-NOMA Systems

Janjua, Muhammad Bilal; Costa, Daniel Benevides da; Arslan, Hüseyin

doi:10.1109/lwc.2020.2973628

Cited by 41 publications

(48 citation statements)

References 13 publications

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“…Applying the Jensen Inequality, it follows that the rightside term in (4) is upper-bounded by the corresponding bound in (2). By the Law of Large Numbers, it is easy to check that the upper-bounds for the MAC AWGN and MAC Rayleigh fast fading channels are the same when the number of users goes to infinity.…”

Section: Figurementioning

confidence: 98%

“…For example, consider a 2-user RCM-MAC system, where users 1 and 2 transmit their source blocks u 1 and u 2 utilizing encoding matrices G (1) and G (2) , respectively. Assume the following design multi-sets W…”

Section: Rcm-mac Systemsmentioning

confidence: 99%

“…In contrast, in a Non-Orthogonal Multiple Access (NOMA) all users share the same frequency and time intervals for their transmissions. NOMA systems outperform OMA schemes in multiple scenarios, such as downlink systems [1], visible light communication systems [2] and short packet communications [3]. Thus, NOMA plays an important role in 5G [4,5,6] and is one of the key technologies that will enable the upcoming 6G networks [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rate Compatible Modulation for Non-Orthogonal Multiple Access

2020

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Section: Figurementioning

confidence: 98%

Section: Rcm-mac Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rate Compatible Modulation for Non-Orthogonal Multiple Access

2020

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“…On the other hand, the authors in [85] proposed a hybrid OMA/NOMA scheme for attocellular VLC based on a smart transmitter that can select dynamically the adequate MA technique according to the environment conditions. Finally, the authors in [86] proposed an efficient user pairing for the cases of having odd and even number of users. First, users are ordered in ascending order based on the channel strength; then, they are either grouped into two or three groups depending on whether the number of the users is even or odd.…”

Section: Noma In Vlcmentioning

confidence: 99%

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

Naser

Sofotasios

Bariah

et al. 2020

IEEE Open J. Veh. Technol.

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The increased proliferation of connected devices requires a development of innovative technologies for the next generation of wireless systems. One of the key challenges, however, is the spectrum scarcity, owing to the unprecedented broadband penetration rate in recent years. Based on this, visible light communication (VLC) has recently emerged as an effective potential solution for enabling high-speed short-range communications. Yet, despite their undoubted advantageous features, VLC systems suffer from several limitations which constraint their capabilities. As a result, several multiple access (MA) techniques, such as space-division multiple access (SDMA) and non-orthogonal multiple access (NOMA), have been considered in VLC networks as an effective approach, among others, to circumvent these limitations. However, despite their achievable multiplexing gain, their overall performance is still limited compared to the overall potential of this technology. Motivated by this, the presented article offers two contributions: firstly, we provide an overview of the key MA technologies used in VLC systems and then we introduce rate-splitting multiple access (RSMA), and discuss its capabilities and potentials in VLC systems. Secondly, through realistic system modeling and simulations of an RSMA-based two-user scenario, we illustrate the flexibility of RSMA as well as its superiority in terms of the achievable weighted sum rate over NOMA and SDMA in the context of VLC. Finally, we discuss technical challenges, open issues, and research directions, along with the offered results and insights that are expected to be useful towards the effective practical realization of RSMA in VLC configurations.

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“…The user pairing problem has also been investigated for NOMA in three-dimensional visible light communication, and strategies for user pairing and PA have been proposed [15].…”

Section: User Pairingmentioning

confidence: 99%

Spatial-Temporal-DBSCAN-Based User Clustering and Power Allocation for Sum Rate Maximization in Millimeter-Wave NOMA Systems

2020

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The combination of millimeter-wave (mmWave) communications and non-orthogonal multiple access (NOMA) systems exploits the capability to serve multiple user devices simultaneously in one resource block. User clustering, power allocation (PA), and hybrid beamforming problems in mmWave-NOMA systems can utilize the network setting’s potential to enhance the system performance. Based on similar characteristics of the spatial distributions of users in real life, we propose a novel spatial-temporal density-based spatial clustering of applications with noise (ST-DBSCAN)-based unsupervised user clustering in order to enhance the system sum-rate. ST-DBSCAN is a state-of-the-art density-based clustering algorithm for solving spatial and non-spatial problems. Moreover, instead of symmetric PA, we propose an inter-cluster PA algorithm. Next, we apply boundary-compressed particle swarm optimization in order to reduce inter-cluster interference and enhance system performance. The simulation results reveal that our proposed solution improves the sum-rate of mmWave-NOMA-based systems when compared with that of mmWave-OMA-based systems. In addition, we compare our proposed algorithm with other benchmark user clustering algorithms in order to investigate the performance of our ST-DBSCAN-based user clustering algorithm. The results also illustrate that our proposed approach outperforms the state-of-the-art user clustering algorithms in mmWave-NOMA systems.

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User Pairing and Power Allocation Strategies for 3D VLC-NOMA Systems

Cited by 41 publications

References 13 publications

Rate Compatible Modulation for Non-Orthogonal Multiple Access

Rate Compatible Modulation for Non-Orthogonal Multiple Access

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

Spatial-Temporal-DBSCAN-Based User Clustering and Power Allocation for Sum Rate Maximization in Millimeter-Wave NOMA Systems

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