Optical Wireless Communication Channel Measurements and Models

Al-Kinani, Ahmed; Wang, Cheng-Xiang; Zhou, Li; Zhang, Wensheng

doi:10.1109/comst.2018.2838096

Cited by 245 publications

(111 citation statements)

References 145 publications

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“…At the kth (k > 0) block, user k switches to Mode 2, while others stay in Mode 1. As a result, denoting H [1] i and H [2] i as the channel matrices for user i under two receiving modes, the received K + 1 blocks of signal for user i is given by…”

Section: (Iii) Blind Interference Alignmentmentioning

confidence: 99%

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Networked multiple-input-multiple-output for optical wireless communication systems

Hanzo

Chen

2020

Phil. Trans. R. Soc. A.

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Section: (Iii) Blind Interference Alignmentmentioning

confidence: 99%

“…As long as H [1] i is not aligned with H [2] i , two elements in s i can be decoded via (2.11). Defining degree of freedom (DoF) as the average number of independent symbols transmitted in a block [17], we find that DoF is equal to (2K/K + 1).…”

Section: (Iii) Blind Interference Alignmentmentioning

confidence: 99%

Networked multiple-input-multiple-output for optical wireless communication systems

Hanzo

Chen

2020

Phil. Trans. R. Soc. A.

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“…In this review paper, we address a few important research areas in indoor VLC: physical layer algorithm design, cross-layer design, and VLC applications. Compared with recent published survey papers [61][62][63][64], this paper focuses on reviewing modulation schemes, network designs for multiuser VLC systems, and indoor positioning and tracking schemes using VLC. These schemes are compared with published algorithms as performance benchmarks.…”

Section: Paper Contribution and Organizationmentioning

confidence: 99%

Indoor visible light communications, networking, and applications

et al. 2019

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Light-emitting diodes (LEDs) are changing indoor wireless communications. Visible light communications (VLC) that use LEDs as transmitters is an emerging research area and has significant commercial potential. The light emitted from LEDs can simultaneously carry information and provide illumination. Due to the intrinsic characteristics of light, VLC is more secure, more power efficient, and can provide higher network data transmission rates than radio frequency communications. This paper describes state-of-the-art VLC systems including transmitters, receivers, and channel models. Modulation and networking algorithms for physical layer and cross-layer designs are discussed. These algorithms are designed considering practical constraints, such as the bandlimited channel, illumination requirements, and transmitted power limitations. Indoor localization algorithms are proposed, with a particular focus on fingerprinting. In addition, this paper introduces practical applications of VLC in many fields such as national defense, healthcare, robotics, and vehicle-tovehicle communications. The paper concludes with a discussion of the challenges, opportunities, and future of VLC. Nomenclature ACO-OFDM asymmetrically clipped optical OFDM APD avalanche photodiode BER bit error rate CDMA code division multiple access CEO-OFDM clipping-enhanced optical OFDM DCO-OFDM DC-biased optical OFDM HCM Hadamard coded modulation IoT internet of things JOW joint optimal waveform LED light-emitting diodes LOS line-of-sight MAI multiple access interference MIMO multiple input multiple output NLOS non-line-of-sight OCDMA optical code division multiple access OFDM orthogonal frequency division multiplexing OOC optical orthogonal code OPEN ACCESS RECEIVED

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“…However, there are higher power optical lasers and higher intensity LEDs for long distance optical wireless communications (OWCs) which have less length intensity dispersion and improved the channel scattering effects [55]. A VLC system in the order of 100-200 m, and up to 300 m has been used to transmit data in the water environment [56,57]. However, due to the properties of oceanic turbulence such as the suspended particles, salinity, and temperature, the line-of-sight path attenuation loss is estimated by the radiative transfer equation (RTE).…”

Section: Underwater Vlc Turbidity and Velocity Characteristicsmentioning

confidence: 99%

Visible Light Communication System for Offshore Wind Turbine Foundation Scour Early Warning Monitoring

Lin

Chang

et al. 2019

Water

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Offshore wind farms have a superior wind source to terrestrial wind farms, but they also face more severe environmental conditions such as severe storms, typhoons, and sea waves. Scour leads to the excavation of sediments around the foundations of structures, reducing the safe capacity of the structures. The phenomenon of pier scour is extremely complex because of the combined effects of the vortex system involving time-dependent flow patterns and sediment transport mechanisms. A real-time scour monitoring system can improve the safety of structures and afford cost-effective operations by preventing premature or unnecessary maintenance. This paper proposes an on-site scour monitoring system using visible light communication (VLC) modules for offshore wind turbine installations. A flume experiment revealed that the system was highly sensitive and accurate in monitoring seabed scour processes. This arrayed-VLC sensory system, proposed in this paper, has considerable potential for safety monitoring and also can contribute to improving the accuracy of empirical scour formulas for sustainable maintenance in the life cycle of offshore structures.

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Optical Wireless Communication Channel Measurements and Models

Cited by 245 publications

References 145 publications

Networked multiple-input-multiple-output for optical wireless communication systems

Networked multiple-input-multiple-output for optical wireless communication systems

Indoor visible light communications, networking, and applications

Visible Light Communication System for Offshore Wind Turbine Foundation Scour Early Warning Monitoring

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