Experimental demonstration of non-line-of-sight visible light communication with different reflecting materials using a GaN-based micro-LED and modified IEEE 802.11ac

Lu, Zhijian; Tian, Pengfei; Fu, Houqiang; Montes, Jossue; Huang, Xuanqi; Chen, Hong; Zhang, Xiaodong; Liu, Xiaoyan; Liu, Ran; Zheng, Lirong; Zhou, Xiaolin; Gu, Erdan; Liu, Yi; Zhao, Yuji

doi:10.1063/1.5048942

Cited by 14 publications

(8 citation statements)

References 13 publications

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“…An MR-compatible OWC front end has been tested for 2 m analog positron emission tomography detector signal transmission [56], but the technology has not yet been exploited for MR signals. Unlike Wi-Fi, high-speed OWC mostly requires a direct line of sight between transceivers, although some systems can even communicate via diffuse light reflections [57]. Suitable components for Li-Fi (Light-Fidelity, i.e., high-speed optical wireless networking [58]) in MRI still remain to be identified and tested on-coil in future studies.…”

Section: Wireless Transmission Technologies and Protocolsmentioning

confidence: 99%

Perspectives in Wireless Radio Frequency Coil Development for Magnetic Resonance Imaging

et al. 2020

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This paper addresses the scientific and technological challenges related to the development of wireless radio frequency (RF) coils for magnetic resonance imaging (MRI) based on published literature together with the authors' interpretation and further considerations. Key requirements and possible strategies for the wireless implementation of three important subsystems, namely the MR receive signal chain, control signaling, and on-coil power supply, are presented and discussed. For RF signals of modern MRI setups (e.g., 3 T, 64 RF receive channels), with on-coil digitization and advanced methods for dynamic range (DR ≥ 16-bit) and data rate compression, still data rates > 500 Mbps will be required. For wireless high-speed MR data transmission, 60 GHz WiGig and optical wireless communication appear to be suitable strategies; however, on-coil functionality during MRI scans remains to be verified. Besides RF signals, control signals for on-coil components, e.g., active detuning, synchronization to the MR system, and B 0 shimming, have to be managed. Wireless power supply becomes an important issue, especially with a large amount of additional on-coil components. Wireless power transfer systems (>10 W) seem to be an attractive solution compared to bulky MR-compatible batteries and energy harvesting with low power output. In our opinion, completely wireless RF coils will ultimately become feasible in the future by combining efficient available strategies from recent scientific advances and novel research. Besides ongoing improvement of all three subsystems, innovations are specifically required regarding wireless technologies, MR compatibility, and wireless power supply.

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Section: Wireless Transmission Technologies and Protocolsmentioning

confidence: 99%

Perspectives in Wireless Radio Frequency Coil Development for Magnetic Resonance Imaging

et al. 2020

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“…Unfortunately, only few papers have studied the performance of a VLC system that is designed for Non-Line-of-Sight (NLoS) transmission from the beginning. For example, some experimental results over NLoS links were presented in [14] when using optical mirrors deployed in the room, or when covering the room floor with a special material that improves its mean spectral reflectance coefficient [15].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Communication System in Presence of Indirect Lighting and Illumination Constraints

Dowhuszko

Ilter

Hämäläinen

2020

ICC 2020 - 2020 IEEE International Conference on Communications (ICC)

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Visible Light Communication (VLC) systems are designed to provide illumination and data services simultaneously. To achieve this goal, LED lamps are usually deployed on the room ceilings, in order to maximize the chances of having Line-of-Sight (LoS) connectivity between the VLC transmitter and the random locations that the VLC receiver can take. In an early stage of adoption, where the cost of LED lighting fixtures enabled with VLC technology will not be suitable for ultra-dense deployments, it is expected that only one VLC transmitter is placed per room. In this situation, the use of direct illumination may have serious problems to satisfy the illumination constraints and provide a homogeneous data rate coverage. Moreover, the use of a single powerful LED lamp per room may create discomfort glare effect to users and over-exposure problems in areas of the room at which the light beam is directed. In order to address these problems, this paper studies the data rate that VLC technology can achieve with indirect illumination. That is, when the LED lamp is pointing upwards, and the VLC user receives the optical signal that is reflected back from the ceiling. Obtained simulation results show that indirect illumination provides a more homogeneous data rate coverage when compared to direct case, while simultaneously verifying the illumination constraints in most of the places that the VLC receiver may take in the room.

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“…However, such an approach might cause non-homogeneous illumination in the service area, discomfort glare effect, and over-exposure problems in light-directed areas [5]. From this perspective, there are only few experimental demonstrations for Non-Line-of-Sight (NLOS) VLC application [6,7]. However, these publications do not address in detail the data rate that is feasible when the VLC system should also verify given illumination constraints.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Power Allocation on Visible Light Communication Using Commercial Phosphor-Converted Led Lamp for Indirect Illumination

Dowhuszko

Ilter

Pinho

et al. 2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Visible light communication (VLC) systems should be designed to provide illumination and wireless data services simultaneously. To achieve this goal at a reasonable cost, the use of Phosphor-Converted (PC) LEDs for indirect illumination should be favored to provide a homogeneous and reliable coverage in the whole service area. Unfortunately, PC-LEDs found in the market so far have not been designed for data transmission; moreover, the response of the other (electro-) optical components of the VLC link are far from ideal. In this paper, we estimate the data rate that is feasible with VLC when indirect illumination is used. For this purpose, the endto-end response of the VLC link is first modeled using actual measurements of the spectral power distribution of a PC-LED lamp and the ceiling reflectance. Then, different power allocation schemes are studied assuming an optical OFDM waveform. As commercial LEDs have a relatively slow time response, the equivalent VLC channel that results has strong frequency selectivity; therefore, notable data rate gains are achievable when waterfilling power allocation is applied.

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Experimental demonstration of non-line-of-sight visible light communication with different reflecting materials using a GaN-based micro-LED and modified IEEE 802.11ac

Cited by 14 publications

References 13 publications

Perspectives in Wireless Radio Frequency Coil Development for Magnetic Resonance Imaging

Perspectives in Wireless Radio Frequency Coil Development for Magnetic Resonance Imaging

Visible Light Communication System in Presence of Indirect Lighting and Illumination Constraints

The Effect of Power Allocation on Visible Light Communication Using Commercial Phosphor-Converted Led Lamp for Indirect Illumination

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