- 标题
- 摘要
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- 实验方案
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Distance-Range-Oriented Constellation Design for VLC-SCMA Downlink with Signal-dependent Noise
摘要： In this paper, the constellation design for a sparse code multiple access (SCMA) based visible light communication (VLC) downlink is studied. The noise at the receiving avalanche photodiode (APD) is dependent on the signal intensity, and the associated design problems are typically intractable. We point out that for such a system both the minimum Euclidean distance (MED) and Rotated-MED based methods are not the optimal optimization objective, and propose a distance-range-oriented (DRO) modulation, where a linear combination of the minimum and maximum Euclidean distance is considered. We observe in the simulation results that the proposed DRO-based scheme outperform the MED and Rotated-MED based ones across a wide range of signal and noise levels.
关键词： distance range,signal-dependent noise,Constellation design,SCMA,visible light communication
更新于2025-09-23 15:22:29
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VLC and D2D Heterogeneous Network Optimization: A Reinforcement Learning Approach Based on Equilibrium Problems with Equilibrium Constraints
摘要： The Radio Frequency (RF) spectrum crunch has triggered the harnessing of other sources of bandwidth, for which visible light is a promising candidate. Even though Visible Light Communication (VLC) ensures high capacity, coverage is limited. This necessitates the integration of VLC and Device-to-Device (D2D) technologies into heterogeneous networks. In particular, mobile users which are accessible by the VLC transmitters can relay data to mobile users which are not, by means of D2D communication. However, due to the distributed behaviors of mobile users, determining optimal data transmission routes from VLC transmitters to end mobile devices is a major challenge. In this paper, we propose a Reinforcement Learning (RL) based approach to determine multi-hop data transmission routes in an indoor VLC-D2D heterogeneous network. We obtain the rewards for the RL based method dynamically, by formulating the interactions between the mobile users relaying the data as an Equilibrium Problem with Equilibrium Constraints (EPEC) and using Alternating Direction Method of Multipliers (ADMM) to solve it. The proposed technique can achieve optimal data transmission routes in a distributed manner. Simulation results demonstrate the effectiveness of the proposed approach, showing that transmission routes with low delays and high capacities can be achieved through the learning algorithm.
关键词： Device-to-Device,Reinforcement Learning,Visible Light Communication,Alternating Direction Method of Multipliers,Heterogeneous Network,Equilibrium Problem with Equilibrium Constraints
更新于2025-09-23 15:22:29
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Multiple Access With Polarity Division Sparse Code for Visible Light Communication
摘要： The increasing demand of mobile internet and Internet of Things poses challenging requirements for indoor wireless communication. Visible light communication (VLC) is a promising technology to alleviate the growing traffic problem. In addition, nonlinear distortion of light emitting diodes (LEDs) results in a poor link quality. In this paper, we propose multiple access with polarity division sparse code (PDSC) for VLC, which is based on nonorthogonal multiple access and spatial characteristic of LEDs. The experimental results indicate that the PDSC significantly enhances capacity and spectral efficiency of VLC network compared with orthogonal frequency division multiple access. We also demonstrate that the PDSC can optimize the problem of nonlinear distortion with polarity division. The experimental results reveal that PDSC is a promising multiple access scheme for the indoor VLC networks.
关键词： Nonorthogonal multiple access,visible light communication,PDSC,nonlinear distortion optimization
更新于2025-09-23 15:22:29
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Generalized Likelihood Block Detection for SPAD-based Underwater VLC System
摘要： In the underwater visible light communication (VLC) system, the single photon avalanche diode (SPAD) can expand communication distance. However, the output signals from practical SPADs under dead time limit are not Poisson distributed. In this paper, the generalized likelihood block detection (GLBD) receiver is developed for practical SPAD-based underwater VLC system with on-off keying (OOK) modulation. The proposed receiver can detect the data sequence without any prior knowledge of the channel and the background radiation. Correspondingly, a fast search algorithm for GLBD receiver is also proposed. In addition, a block coding scheme is utilized to solve the error floor problem. Simulation results show that the bit error rate (BER) performance of the proposed receiver is closer to the BER low bound compared to the existing receiver. Moreover, the fast search algorithm reduces the computational complexity without any performance loss.
关键词： Underwater visible light communication,photon counting,blind detection
更新于2025-09-23 15:22:29
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The Optical Barcode Detection and Recognition Method Based on Visible Light Communication Using Machine Learning
摘要： Visible light communication (VLC) has developed rapidly in recent years. VLC has the advantages of high confidentiality, low cost, etc. It could be an effective way to connect online to offline (O2O). In this paper, an RGB-LED-ID detection and recognition method based on VLC using machine learning is proposed. Different from traditional encoding and decoding VLC, we develop a new VLC system with a form of modulation and recognition. We create different features for different LEDs to make it an Optical Barcode (OBC) based on a Complementary Metal-Oxide-Semiconductor (CMOS) senor and a pulse-width modulation (PWM) method. The features are extracted using image processing and then support vector machine (SVM) and artificial neural networks (ANN) are introduced into the scheme, which are employed as a classifier. The experimental results show that the proposed method can provide a huge number of unique LED-IDs with a high LED-ID recognition rate and its performance in dark and distant conditions is significantly better than traditional Quick Response (QR) codes. This is the first time the VLC is used in the field of Internet of Things (IoT) and it is an innovative application of RGB-LED to create features. Furthermore, with the development of camera technology, the number of unique LED-IDs and the maximum identifiable distance would increase. Therefore, this scheme can be used as an effective complement to QR codes in the future.
关键词： CMOS image sensor,machine learning,image processing,RGB-LED,visible light communication (VLC)
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 10th Latin-American Conference on Communications (LATINCOM) - Guadalajara, Jalisco, Mexico (2018.11.14-2018.11.16)] 2018 IEEE 10th Latin-American Conference on Communications (LATINCOM) - A Comparative Analysis of DSRC and VLC for Video Dissemination in Platoon of Vehicles
摘要： A platoon of vehicles is composed of vehicles moving at a fixed distance and speed, this offers to the driver a comfortable car trip and release him from the stressful driving task. In addition, platooning schemes could also be used to improve the delivery of videos about entertainment, such as movies and news, to increase the user experience. However, such platoon-based services require an efficient Vehicle-to-Vehicle (V2V) communications via Dedicated Short Range Communication (DSRC) and Visible Light Communication (VLC). This paper presents a comparative simulation study to evaluate the quality level of videos transmitted via DSRC and VLC in a platoon-based driving scenario. The simulation results show the benefits of VLC in delivering videos with Quality of Experience (QoE) 30% better compared to DSRC, in scenarios with a different number of hops between the source and destination, as well as videos with different characteristics.
关键词： VANET,Vehicular Visible Light Communication,Platoon,Quality of Experience
更新于2025-09-23 15:22:29
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Dimming Control Systems Based on Low-PAPR SCFDM for Visible Light Communications
摘要： In this paper, the efficient dimming control systems based on single-carrier frequency-division multiplexing (SCFDM) are proposed for visible light communications (VLC). By virtue of the strengths of the low peak-to-average power ratio and the inherent resistance to high-frequency distortion, the proposed SCFDM-based dimming control schemes are adaptive to the bandwidth-limited and linearity-limited VLC system, thus supporting the wide dimming range for different illumination requirements. Two SCFDM-based VLC systems with dimming control including asymmetrical hybrid optical SCFDM (AHO-SCFDM) and DC-biased optical SCFDM (DCO-SCFDM) are proposed. For AHO-SCFDM with spectral efficiency of 1.75 bit/s/Hz and DCO-SCFDM with spectral efficiency of 2 bit/s/Hz, the 20% wider dimming range can be achieved than their orthogonal frequency-division multiplexing (OFDM) based counterparts, respectively. Meanwhile, the two proposed schemes can also achieve 24.8% and 31.3% gains of average spectral efficiency under the same dimming range compared with their counterparts, respectively. For an overall analysis, SCFDM shows the feasibility and superiority for dimming control systems.
关键词： light emitting diode,Visible light communication,single-carrier frequency-division multiplexing,dimming control,orthogonal frequency-division multiplexing
更新于2025-09-23 15:21:21
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[IEEE 2020 International Conference on Information Science and Communication Technology (ICISCT) - KARACHI, Pakistan (2020.2.8-2020.2.9)] 2020 International Conference on Information Science and Communication Technology (ICISCT) - Futuristic Short Range Optical Communication: A Survey
摘要： The demand for high-speed data communication and seamless user connectivity is increasing day by day which lead towards the development of new next generation communication services. Wi-Fi, the most popular wireless networking technology uses radio waves as medium for transmission. However, it has a constraint over security, reliability, speed and range of transmission. Li-Fi addresses these issues by providing a high-speed communication which is tremendously faster than Wi-Fi. Furthermore, it is also considered an ideal candidate for secure communication. In this paper, we present a survey on Li-Fi technique and different architectures which have been proposed over the past for achieving high speed communication using visible light. In addition to this, this paper also discusses the key challenges which are being faced nowadays in achieving optimal visible light communication.
关键词： High Data Rate,Wi-Fi,Li-Fi,Visible Light Communication
更新于2025-09-23 15:21:01
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[IEEE 2020 International Conference on COMmunication Systems & NETworkS (COMSNETS) - Bengaluru, India (2020.1.7-2020.1.11)] 2020 International Conference on COMmunication Systems & NETworkS (COMSNETS) - Demonstration of High Data-rate Multimedia Streaming in a Laser-based Indoor Visible Light Communication System
摘要： We report the demonstration of real-time high-quality multimedia data streaming over a laser-based indoor visible light communication (VLC) link consisting of blue laser diode excited remote phosphor as transmitter, an amplified ac-coupled silicon photodetector as the receiver and USRP platforms for data modulation/ demodulation. The VLC link has been separately characterized and supports bandwidth > 800 MHz. Streaming of 1280 x 720 HD video is successfully demonstrated over this VLC link with an ethernet link data rate of 200Mbps and RF carrier frequency at the radio front-end at 245 MHz. When compared to previous multimedia streaming demonstrations in LED based VLC links, the high link data rates, and RF carrier frequency as reported here are achievable due to the large inherent bandwidth supported by laser sources. The potential applications of this demonstration are in next-generation heterogeneous wireless networks in which Wi-Fi and VLC links link as co-exist. The high-bandwidth optical wireless link demonstrated here is suitable for low-latency, data-intensive, dedicated communication, for example in robotic telepresence, tactile tasks, etc.
关键词： Multimedia Streaming,Laser Diode,Visible Light Communication,USRP
更新于2025-09-23 15:21:01
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Sherman-Morrison Formula Aided Adaptive Channel Estimation for Underwater Visible Light Communication With Fractionally-sampled OFDM
摘要： In this paper, we investigate the channel estimation (CE) problem in an underwater visible light communication (UVLC) system invoking fractionally-sampled optical orthogonal frequency division multiplexing (FS-OOFDM). In practical UVLC scenarios, the communication links inevitably suffer from many stochastic channel effects including multi-path dispersion, scattering, turbulence, etc., and/or from the mobility of the transceiver, therefore resulting in a time-varying, location-dependent non-stationary propagation environment. Naturally, compared with the indoor visible light communication (VLC) scenario with a typical assumption being the time-flat channel models, it becomes a notable challenge for designing a low-complexity adaptive CE in the much more complicated UVLC scenarios. To solve this problem, we derive a class of Bayesian CE algorithms referred to as the Sherman-Morrison formula (SMF) based CE (SMF-CE), by exploiting the property of rank-one structure of the second-order channel statistics in the delay domain. Furthermore, an adaptive version of SMF-CE (ASMF-CE) can be obtained through updating the imperfect a priori knowledge of the channel and the noise’s statistics. Simulation results demonstrate the superior performances of the proposed algorithms in comparison to existing methods, while maintaining a reduced computational complexity in comparison to the conventional linear minimum mean square error (LMMSE) scheme.
关键词： Sherman-Morrison formula (SMF),Channel estimation (CE),underwater visible light communication (UVLC),fractional sampling (FS),optical orthogonal frequency division multiplexing (OOFDM)
更新于2025-09-23 15:21:01