Layered Optical OFDM With Adaptive Bias for Dimming Compatible Visible Light Communications

Li, Baolong; Xue, Xiaomei; Feng, Simeng; Xu, Wei

doi:10.1109/jlt.2021.3067495

Cited by 21 publications

(8 citation statements)

References 33 publications

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“…Because the LOS channel contains most of the transmitted power, this work focuses on a point-to-point link. We assume that the optical wireless channel only has the LOS part and ignore the NLOS part [6], [11], [29]. At the receiver, the hybrid VL/IR signal is detected by a PD, and the electrical signal at the output of the PD can be written by:…”

Section: A Working Principlementioning

confidence: 99%

See 1 more Smart Citation

Real-Time Implementation of Hybrid Visible Light/Infrared Communications Supporting Full-Range Dynamic Dimming Control

Liu,

You,

Chen

et al. 2024

IEEE Photonics J.

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Implementing dimming control in visible light communication (VLC) systems often involves a trade-off that reduces data rates. To address this, we propose a hybrid visible light (VL)/Infrared (IR) communication scheme that leverages pulse amplitude modulation (PAM) symbols in both VL and IR spectra, alternating them within pulse width modulation (PWM) "ON" and "OFF" slots. By efficiently using PWM "OFF" slots, the achievable data rate drop due to dimming is mitigated without affecting illumination. To ensure synchronization during the switch between VL and IR links, we design real-time dimming control state machines at both ends of the link, enhancing link stability. Additionally, we develop an adaptive hybrid frame structure that dynamically adjusts the length of transmitted information as the duty cycle continuously changes, ensuring uninterrupted communication. Experimental results from implementation using field-programmable gate arrays (FPGA) demonstrate real-time transmission under precise fullrange dimming control, dynamically ranging from 1 to 0 with a resolution of 0.0053, maintaining a consistent 10 Mb/s data rate at bit error rates (BERs) lower than 3.4×10 -4 and 20 Mb/s at BERs lower than 7.0×10 -3 within a link range of 0.53 m without light concentration at the transmitter. Compared to baseline VLC, our system achieves a 100% data rate improvement at a duty cycle of 0.5, and supports stable data transmission even in low-light conditions.

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Section: A Working Principlementioning

confidence: 99%

“…However, integrating dimming control into VLC systems presents challenges, as it can potentially impact communication performance by reducing achievable data rates during dimming. Balancing this trade-off is crucial when designing VLC systems [6], [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Implementation of Hybrid Visible Light/Infrared Communications Supporting Full-Range Dynamic Dimming Control

Liu,

You,

Chen

et al. 2024

IEEE Photonics J.

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show abstract

“…From the FFT output, it can be observed that at the odd subcarriers and at specified even subcarriers of 2(2𝑚 + 1) where, 𝑚 = 0, 1, … , 𝑁 8 − 1 , the output is free of any interference. Hence, the output can be detected by using a regular OFDM receiver structure 28 , which involves performing the FFT operation directly on it.…”

Section: Receiver Sectionmentioning

confidence: 99%

PAPR reduction using SLM technique combined with ABO-OFDM for optical wireless communication

Saxena,

Saw,

Choure

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

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“…[2][3][4][5] In recent years, as one emerging technology, the visible light positioning (VLP) can bring the incomparable advantages of visible light communication (VLC) into full play, such as low cost, low power consumption, anti-interference, environmental protection, no electromagnetic contamination, great network capacity, high speed, and efficiency, which can realize the reuse of positioning and lighting simultaneously and has become one of the research highlights. [6][7][8][9][10] Up to now, various VLP methods have been proposed by different groups. [11][12][13][14] In Ref.…”

Section: Introductionmentioning

confidence: 99%

Indoor high-accuracy multi-dimensional visible light positioning method with adaptive particle swarm optimization algorithm

Wang

Yang

et al. 2023

Opt. Eng.

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.An indoor multi-dimensional visible light positioning method on the basis of visible light communication (VLC) has been proposed considering the impact of vertical and horizontal inclination angles of the target besides the traditional three-dimensional position parameters that can be expressed as ( x , y , z ) in the coordinate system. Specifically, the adaptive particle swarm optimization algorithm is adopted to search the global optimum in the whole space as the estimation position, which can efficiently improve searching ability and avoid premature convergence, thus efficiently improving the accuracy and stability of positioning results. Simulation results show that when the signal-to-noise ratio is equal to 25, 30, and 35 dB, over 91%, 93%, and 98% test points could achieve sub-centimeter level positioning, and ∼94 % , 90%, and 99% test points could satisfy the requirements of small angle in physics of horizontal inclination, respectively. And under such conditions, nearly all the test errors of vertical inclination are lower than 5 deg except one in 30 dB. Our work provides a good reference for the study of indoor VLC positioning method.

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Layered Optical OFDM With Adaptive Bias for Dimming Compatible Visible Light Communications

Cited by 21 publications

References 33 publications

Real-Time Implementation of Hybrid Visible Light/Infrared Communications Supporting Full-Range Dynamic Dimming Control

Real-Time Implementation of Hybrid Visible Light/Infrared Communications Supporting Full-Range Dynamic Dimming Control

PAPR reduction using SLM technique combined with ABO-OFDM for optical wireless communication

Indoor high-accuracy multi-dimensional visible light positioning method with adaptive particle swarm optimization algorithm

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