High-Efficient and Low-Cost Biased Multilevel Modulation Technique for IM/DD-Based VLP Systems

Kim, Duckyong; Park, Jong Kang; Kim, Jong-Tae

doi:10.1109/access.2020.3042787

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…The system was implemented using using a mobile phone camera for data reception to obtain indoor position using VLC. A modified Hadamard code-based multilevel modulation method was proposed for the indoor positioning system in [12]. A two-level OOK signal for light fidelity (LiFi) communication was presented to overcome the flickering problem [13].…”

Section: Related Workmentioning

confidence: 99%

A Bandwidth Efficient Hybrid Multilevel Pulse Width Modulation for Visible Light Communication System: Experimental and Theoretical Evaluation

Sejan

Naik

Lee

et al. 2022

IEEE Open J. Commun. Soc.

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Visible light communication (VLC) is considered a new technology for interconnecting devices in 5G and beyond. VLC can provide additional bandwidth for communicating devices which can help to reduce the radio frequency bandwidth congestion. In this work, we aim to maximize the bandwidth usages for VLC. The proposed modulation technique can impose more bits due to the combined utilization of both pulse height and width changes. Moreover, we subdivide the single bit duration to impose more bits for data transmission. The proposed modulation is capable of transmitting more bits by utilizing fewer optical pulses than other traditional modulation techniques such as multilevel modulation, on-off keying, pulse width modulation, pulse position modulation, pulse amplitude modulation, and multiple pulse position modulation. We have evaluated the theoretical bit error rate (BER) expression in terms of average signal to noise ratio and compared the experimental BER performance for the proposed system. The experimental results demonstrate that the proposed modulation technique can achieve a communication distance of 3 m in an indoor environment.

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Section: Related Workmentioning

confidence: 99%

A Bandwidth Efficient Hybrid Multilevel Pulse Width Modulation for Visible Light Communication System: Experimental and Theoretical Evaluation

Sejan

Naik

Lee

et al. 2022

IEEE Open J. Commun. Soc.

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“…A new optical signal modulation technique suitable for intensity-modulation/direct-detection (IM/DD)-based VLP systems was developed in [ 58 ]. The comparative simulations reported that the proposed scheme improved the signal-to-noise ratio (SNR) by more than 4.6 dB, reduced the channel error by 3.5 times or more, and reduced the peak-to-average power ratio (PAPR) by more than 6 dB, excluding time division multiple access (TDMA).…”

Section: Introductionmentioning

confidence: 99%

Weak Calibration of a Visible Light Positioning System Based on a Position-Sensitive Detector: Positioning Error Assessment

De-La-Llana-Calvo

Lázaro-Galilea

Gardel

et al. 2021

Sensors

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Reduced deployment and calibration requirements are key for scalable and cost-effective indoor positioning systems. In this work, we propose a low-complexity, weak calibration procedure for an indoor positioning system based on infrastructure lighting and a positioning-sensitive detector. The proposed calibration relies on genetic algorithms to obtain the relevant system parameters in the real positioning environment without a priori information, and requires a low number of simple measurements. The achievable performance of the proposal was assessed by direct comparison with a formal offline calibration method requiring complex dedicated infrastructure and instruments. The comparative error assessment showed that the maximum accuracy reduction compared to the significantly more costly formal calibration was below 25 mm, and the overall absolute positioning error was smaller than 35 mm with orientation errors of around 0.25°. The performance achieved with the proposed weak calibration procedure is sufficient for many indoor positioning applications and largely reduces the cost and complexity of setting up the positioning system in real environments.

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Single LED, Single PD-Based Adaptive Bayesian Tracking Method

Kim

Park

Kim

2022

Sensors

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Recently, with the growing interest in indoor location-based services, visible light positioning (VLP) systems have been extensively studied owing to their advantages of low cost, high energy efficiency, and no electromagnetic interference. However, due to structural limitations which lead to the requirement of multiple signal sources, it has been challenging to apply VLP in real-world scenarios. In this study, we propose a single LED, single PD-based tracking system that solves these problems by applying a new Bayesian method that can effectively reduce the computational burden of particle filters. The method of evaluating particle reliability developed in this work adjusts the number of particles on the fly. Using the absolute position of the single LED source, the long-term cumulative error of the inertial measurement unit can be continuously corrected. In this regard, the applicability of the VLP system can be enhanced in places where the multiple luminescent signals are hard to consistently detect. The proposed system was verified through experiments in a classroom and a corridor, and the results show an average error of less than 11 cm at travel distances of 80 to 100 m.

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High-Efficient and Low-Cost Biased Multilevel Modulation Technique for IM/DD-Based VLP Systems

Cited by 3 publications

References 32 publications

A Bandwidth Efficient Hybrid Multilevel Pulse Width Modulation for Visible Light Communication System: Experimental and Theoretical Evaluation

A Bandwidth Efficient Hybrid Multilevel Pulse Width Modulation for Visible Light Communication System: Experimental and Theoretical Evaluation

Weak Calibration of a Visible Light Positioning System Based on a Position-Sensitive Detector: Positioning Error Assessment

Single LED, Single PD-Based Adaptive Bayesian Tracking Method

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