Li-Fi: Light fidelity-a survey

Bao, Xu; Yu, Guanding; Dai, Jisheng; Zhu, Xiaoyan

doi:10.1007/s11276-015-0889-0

Cited by 72 publications

(35 citation statements)

References 46 publications

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“…A number of papers focused on multiple VLC technologies [12]. Light-fidelity (Li-Fi) [13][14][15][16][17][18][19][20] is slowly surfacing as commercially available alternative to Wi-Fi [21]. Orthogonal frequency division multiplexing in car-to-car was tested in real-world driving scenarios by Shen et al [22].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Communication System Based on Software Defined Radio: Performance Study of Intelligent Transportation and Indoor Applications

2019

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In this paper, our first attempt at visible light communication system, based on software defined radio (SDR) and implemented in LabVIEW is introduced. This paper mainly focuses on two most commonly used types of LED lights, ceiling lights and LED car lamps/tail-lights. The primary focus of this study is to determine the basic parameters of real implementation of visible light communication (VLC) system, such as transmit speed, communication errors (bit-error ratio, error vector magnitude, energy per bit to noise power spectral density ratio) and highest reachable distance. This work focuses on testing various multistate quadrature amplitude modulation (M-QAM). We have used Skoda Octavia III tail-light and Phillips indoor ceiling light as transmitters and SI PIN Thorlabs photodetector as receiver. Testing method for each light was different. When testing ceiling light, we have focused on reachable distance for each M-QAM variant. On the other side, Octavia tail-light was tested in variable nature conditions (such as thermal turbulence, rain, fog) simulated in special testing box. This work will present our solution, measured parameters and possible weak spots, which will be adjusted in the future.

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Section: Introductionmentioning

confidence: 99%

Visible Light Communication System Based on Software Defined Radio: Performance Study of Intelligent Transportation and Indoor Applications

2019

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“…While significant progress is being made in VLC/ LiFi research [10], these efforts are not particularly directed at resource constrained devices. Compelling electrical and computing power limitations of the IoT nodes will inform the design of energy efficient modulation and multiple access techniques.…”

Section: Energy Efficient Multi-device Lifi Modulations and Multiple mentioning

confidence: 99%

Powering the Internet of Things through Light Communication

et al. 2019

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“…In OWC, data are transferred by modulating the LED light intensity. Hence, intensity modulation and direct detection (IM/DD) have emerged as one of the promising candidates for OWC systems [7,8].…”

Section: Introductionmentioning

confidence: 99%

Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication

2020

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An efficient optical modulation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system is proposed in this paper. The proposed modulation technique is termed as extended spatial-index light-emitting diode (LED) modulation. In the proposed technique, the indices (the spatial domain) of the LEDs are exploited in a dynamic style to not only get rid of the optical OFDM time-domain ( OFDM t d ) shaping problem but also to expand the LED indices spatial modulation domain. The indices of the active LEDs in the proposed technique are changed from the two LEDs active situation to the situation where all or several LEDs are active. Moreover, within the selected active LED indices, the power weight distribution and the positions of the OFDM components are varied to expand the resultant spatial domain. Therefore, the proposed technique offers a considerable spectral efficiency improvement over the up-to-date LED index OFDM modulation schemes even with a lower number of LEDs. The key idea of the proposed technique is to maximize the LEDs’ indices spatial position (spatial domain) utilization, where both the power weight allocation and the positions of the complex OFDM time domain components are varying several times over the same active LED indices combination, which improve the optical system spectral efficiency. The simulation results asserted the superiority of the proposed technique, as it improves both the average bit error rate (ABER) and the achievable data rate (R) compared with existing up-to-date OFDM-LED index modulations with even lower computational complexity.

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Li-Fi: Light fidelity-a survey

Cited by 72 publications

References 46 publications

Visible Light Communication System Based on Software Defined Radio: Performance Study of Intelligent Transportation and Indoor Applications

Visible Light Communication System Based on Software Defined Radio: Performance Study of Intelligent Transportation and Indoor Applications

Powering the Internet of Things through Light Communication

Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication

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