- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Optimization of Non-Orthogonal Multiple Access based Visible Light Communication Systems
摘要： In Visible Light Communication (VLC), the data is transmitted by modulating the Light Emitting Diode (LED). The data-rate is throttled by the narrow modulation bandwidth of LEDs which results as a barrier in attaining high transmission rates. Non-Orthogonal Multiple Access (NOMA) is a new Multiple Access (MA) scheme envisioned to improve the system capacity. In addition to MA schemes, optimization techniques are applied to further improve the data-rate. In this letter, convex optimization is applied on NOMA-based VLC system for downlinks. The proposed optimization system is analyzed in terms of the Bit Error Rate (BER) and the sum-rate.
关键词： Sum-rate maximization,Visible Light Communication,Non-Orthogonal Multiple Access (NOMA),Convex Optimization,5G
更新于2025-09-23 15:23:52
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Energy Efficient Transceiver Design for NOMA VLC Downlinks with Finite-Alphabet Inputs
摘要： Non-orthogonal multiple access (NOMA) is considered as a promising technique in visible light communication (VLC) systems for performance enhancement. In order to improve the system’s energy ef?ciency, we carry out transceiver design for an NOMA VLC system. We develop an optimal power allocation scheme for the system based on ?nite-alphabet inputs, and we propose a joint detection and decoding (JDD) algorithm for signal detection. Comprehensive simulation results demonstrate that our proposed NOMA strategy can achieve signi?cant performance gains over the time division multiple access (TDMA) scheme, and our designed JDD algorithm outperforms the conventional successive interference cancellation (SIC) algorithm for NOMA.
关键词： visible light communication (VLC),?nite-alphabet inputs,joint detection and decoding (JDD),power allocation,non-orthogonal multiple access (NOMA)
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE Wireless Communications and Networking Conference (WCNC) - Marrakesh, Morocco (2019.4.15-2019.4.18)] 2019 IEEE Wireless Communications and Networking Conference (WCNC) - A Robust and Energy Efficient NOMA-Enabled Hybrid VLC/RF Wireless Network
摘要： The present work investigates the performance of non-orthogonal multiple access (NOMA) in a hybrid visible light communication (VLC)/radio frequency (RF) wireless network. In particular, we investigate the energy efficiency of the proposed architecture assuming imperfect channel state information (CSI), which is a realistic assumption that is encountered in practical indoor and outdoor wireless communication scenarios. We demonstrate that the performance of the proposed scheme in terms of energy efficiency outperforms by four-fold the corresponding performance of its orthogonal frequency division multiple access (OFDMA) counterpart. In addition, it is shown that the energy efficiency of the proposed scheme is more robust to CSI errors and line of sight (LOS) variations than the OFDMA-based scheme, which appears to be more susceptible to the CSI error and the LOS availability probability. Finally, our findings reveal that the performance gain of NOMA over OFDMA in the considered hybrid VLC/RF setup is directly proportional to the probability of LOS availability. These results are expected to be useful in the efficient design and efficient operation of hybrid VLC/RF wireless systems.
关键词： Non-orthogonal multiple access (NOMA),Energy efficiency,Channel state information (CSI),Radio frequency (RF),Visible light communication (VLC),Hybrid wireless network
更新于2025-09-12 10:27:22
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Outage of SEE-OFDM VLC-NOMA Networks
摘要： In this letter, an indoor spectrally and energy efficient orthogonal frequency division multiplexing (SEE-OFDM) based visible light communication (VLC) network with non-orthogonal multiple access (NOMA) is studied. An exact expression of the outage probability for K NOMA users is derived. We also provide an upper bound of the data rate of the SEE-OFDM VLC-NOMA network. Finally, the proposed system model shows its superiority compared to the orthogonal multiple access.
关键词： outage probability (OP),visible light communication (VLC),Non-orthogonal multiple access (NOMA)
更新于2025-09-10 09:29:36
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Multiple Access Design for Ultra-Dense VLC Networks: Orthogonal v.s. Non-Orthogonal
摘要： Small cell aided ultra-dense networks (UDN) constitute an efficient solution to the ever-increasing thirst for more data. Thanks to the vast untapped high-frequency spectrum of visible light, visible light communications (VLC) is a natural candidate for UDN. In this paper, layered asymmetrically clipped optical OFDM (LACO-OFDM) aided ultra-dense VLC (UD-VLC) is investigated in terms of its user-association, multiple access (MA) and resource allocation. To handle the severe inter-cell interference (ICI) amongst the densely-deployed access points (AP), we propose a novel overlapped clustering technique relying on a hybrid non-orthogonal MA (NOMA) and orthogonal MA (OMA) scheme for enhancing the performance, with the aid of our dynamic resource allocation conceived. Our simulations show that the proposed LACO-OFDM aided UD-VLC using our hybrid MA scheme is more robust against the ICI, at a price of modestly decreasing the sum-throughput.
关键词： visible light communications (VLC),resource allocation,non-orthogonal multiple access (NOMA),Ultra-dense network (UDN),multiple access (MA)
更新于2025-09-09 09:28:46