Dimming schemes for visible light communication: the state of research

Zafar, Fahad; Karunatilaka, Dilukshan; Parthiban, Rajendran

doi:10.1109/mwc.2015.7096282

Cited by 121 publications

(65 citation statements)

References 12 publications

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“…To this end, it is firstly recalled that adjusting the brightness level of the LED can be achieved by two approaches: 1) analog dimming, where the driving current of the LED is directly adjusted to the required illumination level; 2) digital dimming, in which the driving current is maintained constant while the duty cycle is varied in order to acquire the desired brightness [41], [42].…”

Section: Noma-vlc With Dimming Controlmentioning

confidence: 99%

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Marshoud¹,

Sofotasios²,

Muhaidat³

et al. 2017

IEEE Trans. Wireless Commun.

156

101

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Visible light communications (VLC) have been recently proposed as a promising and efficient solution to indoor ubiquitous broadband connectivity. In this paper, non-orthogonal multiple access, which has been recently proposed as an effective scheme for fifth generation (5G) wireless networks, is considered in the context of VLC systems, under different channel uncertainty models. To this end, we first derive a novel closed-form expression for the bit-error-rate (BER) under perfect channel state information (CSI). Capitalizing on this, we quantify the effect of noisy and outdated CSI by deriving a simple approximated expression for the former and a tight upper bound for the latter. The offered results are corroborated by respective results from extensive Monte Carlo simulations and are used to provide useful insights on the effect of imperfect CSI knowledge on the system performance. It was shown that, while noisy CSI leads to slight degradation in the BER performance, outdated CSI can cause detrimental performance degradation if the order of the users' channel gains change as a result of mobility.

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Section: Noma-vlc With Dimming Controlmentioning

confidence: 99%

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Marshoud¹,

Sofotasios²,

Muhaidat³

et al. 2017

IEEE Trans. Wireless Commun.

156

101

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“…Analog dimming used Continuous Current Reduction (CCR) technique to control the LED illumination. In CCR, the current flow through an LED was directly reduced by reducing the LED voltage to achieve dimming [2], [4]. However, this caused the LED's to be under driven and resulted in chromaticity shifts [2].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The LED driving signal in optical communication must be real and positive [2], [3]. Hence, the proposed digital Pulse Width Modulation (PWM) dimming control solution uses Optical-Orthogonal Frequency Division Multiplexing (O-OFDM) which uses real and positive signals for VLC optical communication.…”

Section: Introductionmentioning

confidence: 99%

Dimming Control in Visible Light Communication using RPO-OFDM and Concatenated RS-CC

Ali¹,

Abdulaziz²

2016

IJCIS

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“…Dimming control is particularly important for indoor applications, where a user may want to maintain a desired lighting ambiance. The interest in dimming control functionality has further increased in the wake of everincreasing global energy consumption, which is expected to rise further by another 60% over the next 25 years [5]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Unary-Coded Dimming Control Improves ON-OFF Keying Visible Light Communication

Babar

Izhar

Nguyen

et al. 2018

IEEE Trans. Commun.

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Abstract-An ideal Visible Light Communication (VLC) system should facilitate reliable data transmission at high throughputs, while also providing flicker-free illumination at the user-defined dimming level. In this spirit, we conceive a unary code aided dimming scheme for On-Off Keying (OOK) modulated VLC systems. The proposed unary-coded scheme facilitates joint dimming and throughput control, while relying on iterative decoding. It is demonstrated that the proposed unary-coded dimming scheme provides attractive throughput gains over its contemporaries and it is also capable of approaching the theoretical throughput limit. Furthermore, we design novel joint dimming-Forward Error Correction (FEC) coding schemes, which significantly outperform their compensation time dimming based counterparts in terms of the attainable Bit Error Rate (BER) performance as well as the throughput. Finally, in the quest for approaching the capacity, we also optimize our system using EXtrinsic Information Transfer (EXIT) charts and demonstrate an SNR-gain of upto 6 dB over the compensation time dimming based classic benchmarker.

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Dimming schemes for visible light communication: the state of research

Cited by 121 publications

References 12 publications

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Dimming Control in Visible Light Communication using RPO-OFDM and Concatenated RS-CC

Unary-Coded Dimming Control Improves ON-OFF Keying Visible Light Communication

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