Optimal Brightness-Rate Control using VR-MPPM and its Spectral Analysis for VLC System

Tahir, Muhammad; Siddique, Abu Bakar

doi:10.1109/lcomm.2012.050412.112487

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…Later, authors in [20], [21] and [22] adapted the MPPM and OPPM schemes, respectively, to incorporate the provision for dimming control by changing the number of pulses being transmitted in each symbol. The spectral efficiencies and power requirements of VOOK, VPPM and MPPM are studied in [20], where the authors show that the spectral efficiency of MPPM is higher than that of VOOK and VPPM.…”

Section: ) Dimming Controlmentioning

confidence: 99%

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Raj

Jaiswal²,

Dixit

2021

IEEE Open J. Commun. Soc.

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Visible light communication (VLC) is being envisioned as an enabling technology to provide the much-needed spectral relief for the ever-increasing demand for Internet connectivity and data consumption. Since VLC uses illumination sources for lighting as well as communication, it is required to provide dimming control for proper lighting and enhanced error performance for reliable data communication. In this paper, we address both these issues holistically. We formulate and study the power spectral densities of dimming-based modulation schemes, namely variable on-off keying (VOOK) and variable pulse position modulation (VPPM), and hence, derive their bandwidth requirements and spectral efficiencies. Moreover, the capacity of VLC systems is severely limited by the inter-symbol interference (ISI) occurring as a result of the multipath propagation of light signals in VLC. We propose to ameliorate the error performance of VLC systems by using channel equalization for ISI mitigation, thereby enhancing the system capacity. We develop the analytical model of a dimmable VLC system employing channel equalization and use this model to study the effect of dimming and data rate on the error performance of VOOK and VPPM schemes. We present simulation and analytical results to show that the performance of dimming-based modulation schemes is significantly improved using channel equalization.INDEX TERMS Dimming, ISI mitigation, channel equalization, visible light communication.

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Section: ) Dimming Controlmentioning

confidence: 99%

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Raj

Jaiswal²,

Dixit

2021

IEEE Open J. Commun. Soc.

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“…To improve the data-transmission rate of VPPM, VR-MPPM has been explored in [58]. VR-MPPM system is the developed version of MPPM for supporting dimming control [51].…”

Section: ____________________________________________________________mentioning

confidence: 99%

An In-depth Survey of Viisiiblle Liight Communiicatiion Modullatiing and Codiing schemes for Diimmiing/Flliicker Avoiidance Technollogiies

Ghandour

Zekry

Mohammed

et al. 2019

Menoufia Journal of Electronic Engineering Research

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“…Among them, variable on-off keying (VOOK) [1], overlapping pulse-positionmodulation (OPPM) [2], variable pulse-position-modulation (VPPM) [3] and multi-pulse-position-modulation (MPPM) [4] are of significance. The solutions proposed in [5], [6], [7] and [8] also aim for the dual objective of data transmission and brightness control.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth efficient multi-level MPPM encoding decoding algorithms for joint brightness-rate control in VLC systems

Siddique

Tahir

2014

2014 IEEE Global Communications Conference

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A number of binary modulation schemes are proposed for LED based Visible Light Communication (VLC) systems to jointly achieve data transmission and brightness control. These binary modulation based solutions are spectrally inefficient because they consider the LED light source as single device. We observe that most of the commercial LED lights use more than one LED per light source and the possibility of individual current control of these LEDs would provide better brightness control resolution as well as higher data transmission rates. To achieve this we propose multi-level multi-pulse position modulation block coding scheme to jointly control multiple LEDs providing flicker free VLC link. The brightness level of the light source is controlled based on the number of LEDs switched on simultaneously. New algorithms are developed for symbol encoding/decoding as well as to enumerate the maximum number of symbols that can be encoded for the selected brightness level and the number of levels. Improvement in spectral efficiency is analyzed and compared with the contending binary modulation schemes.

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Optimal Brightness-Rate Control using VR-MPPM and its Spectral Analysis for VLC System

Cited by 10 publications

References 10 publications

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

Dimming-Based Modulation Schemes for Visible Light Communication: Spectral Analysis and ISI Mitigation

An In-depth Survey of Viisiiblle Liight Communiicatiion Modullatiing and Codiing schemes for Diimmiing/Flliicker Avoiidance Technollogiies

Bandwidth efficient multi-level MPPM encoding decoding algorithms for joint brightness-rate control in VLC systems

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