A Power and Spectrum Efficient NOMA Scheme for VLC Network Based on Hierarchical Pre-Distorted LACO-OFDM

Li, Haoyue; Huang, Zhitong; Xiao, Yu; Zhan, Shuang

doi:10.1109/access.2019.2908524

Cited by 28 publications

(12 citation statements)

References 19 publications

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“…In [57], Li et al improved the transmitter signal processing of the LACO-OFDM signal. Explicitly, in their TX design, the higher layer signals were pre-distorted by subtracting the clipping distortions of the previous layers from the signal before LB clipping.…”

Section: Complexity Reductionmentioning

confidence: 99%

The Evolution of Optical OFDM

Zhang

Babar

Petropoulos

et al. 2021

IEEE Commun. Surv. Tutorials

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Optical Orthogonal Frequency-Division Multiplexing (O-OFDM) is eminently suitable for mitigating the multi-path and chromatic dispersion in both Visible Light Communications (VLC) and Optical Fiber Communications. We commence our discourse by surveying the conception and historic evolution of O-OFDM designed for both VLC and optical fiber, culminating in the birth of its most flexible design alternative, namely Layered Asymmetrically Clipped Optical OFDM (LACO-OFDM). We demonstrate that it is eminently suitable for intensity-modulation and direct-detection aided optical communication systems and characterize its design flexibility. It is also shown that given its flexibility, it subsumes a wide range of optical OFDM schemes conceived over the past two decades or so. The LACO-OFDM transmitter and receiver designs strike a compelling compromise between the features of the popular Asymmetrically Clipped Optical OFDM (ACO-OFDM) and Direct Current Offset OFDM (DCO-OFDM). The pivotal role of forward error correction (FEC) designs is also surveyed with the objective of striking a coding gain versus complexity trade-off. We conclude by highlighting a suite of promising techniques capable of further improving the system performance, but require further research. The take-away message of the paper crystallized in the associated design guidelines.

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Section: Complexity Reductionmentioning

confidence: 99%

The Evolution of Optical OFDM

Zhang

Babar

Petropoulos

et al. 2021

IEEE Commun. Surv. Tutorials

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“…The association parameter and the bandwidth are kept fixed here. In [19], similar to energy efficiency, power efficiency maximization of a hybrid multiple access scheme for visible light communication systems has been studied which offers a better bandwidth allocation. The fundamental objective here is to fill the odd subcarriers optimally.…”

Section: Related Work and The Significance Of The Application Of mentioning

confidence: 99%

“…This paper aims for finding the optimal user association, transmit power allocation for APs, and the optimal downlink bandwidth allocation done by the AP for the UEs associated with it. The resource allocation will be done for maximizing r i obtained in (19). The resource allocation problem is formulated as…”

Section: E the Resource Allocation Problemmentioning

confidence: 99%

Deep Q-Network Learning Based Downlink Resource Allocation for Hybrid RF/VLC Systems

Shrivastava

Chen

et al. 2020

IEEE Access

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Developing high data rate systems to meet the requirements of fifth generation mobile systems has become crucial. Hybrid radio frequency/visible light communication (RF/VLC) has appeared as a promising mechanism for achieving this objective. In hybrid RF/VLC, data rate maximization is subject to constraints on bandwidth, power and the user association. The joint optimization problem of bandwidth, power and user association to maximize the data rate is non-concave and obtaining an optimal solution is difficult with conventional optimization algorithms. The existing solutions are based on a presumption of at least one optimization variable. In this paper, this issue has been overcome by solving the joint optimization problem in hybrid RF/VLC with a deep Q-network (DQN) learning based algorithm, which has been recognized as an efficient learning based mechanism for optimization. Our system model considers one RF and multiple VLC access points (APs). The idle APs are also incorporated in the system model. The application of DQN learning based algorithm is carried out by finding an optimal policy with the help of an action-value function. As the data sets for the considered system are large, a multi-layered network is used for approximating the action-value function estimator. Finally, a transfer learning based algorithm has been proposed for maximizing the total data rate of the system for the case of a newly entering user equipment (UE) that uses the information of the environment before the arrival of the new UE. Through simulations, it is found that our proposed algorithms can lead to an improvement of more than 10% and 54% in the achievable sum-rate and number of iterations for convergence respectively as compared to that obtained with existing conventional optimization algorithms.

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“…J. Shi et al demonstrated a NOMA-VLC using subcarrier pair-wise coding with transmission distance of 40 cm [17]. In the same year, H. Li et al illustrated a NOMA-VLC using pre-distorted layered asymmetrically clipped OFDM with transmission distances of 40 cm and 70 cm for UE 1 and UE 2 respectively [18]. In 2020, Y. Wang et al demonstrated a three users NOMA-VLC with transmission distance of 120 cm [19].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Non-Hermitian Symmetry (NHS) IFFT/FFT Size Efficient OFDM Non-Orthogonal Multiple Access (NOMA) for Visible Light Communication

et al. 2020

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We propose and experimentally demonstrate a non-orthogonal multiple access (NOMA) visible light communication (VLC) system using non-Hermitian symmetry (NHS) inverse-fast-Fourier-transform (IFFT)/FFT size efficient (SE) orthogonal frequency division multiplexing (OFDM). Fix power allocation and successive interference cancellation (SIC) algorithms are realized. The power ratio between different users, transmission distance, network cell coverage are investigated. The proposed scheme is also compared with the HS based direct-current optical (DCO)-OFDM NOMA-VLC system.

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A Power and Spectrum Efficient NOMA Scheme for VLC Network Based on Hierarchical Pre-Distorted LACO-OFDM

Cited by 28 publications

References 19 publications

The Evolution of Optical OFDM

The Evolution of Optical OFDM

Deep Q-Network Learning Based Downlink Resource Allocation for Hybrid RF/VLC Systems

Demonstration of Non-Hermitian Symmetry (NHS) IFFT/FFT Size Efficient OFDM Non-Orthogonal Multiple Access (NOMA) for Visible Light Communication

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