A capacity-approaching coding scheme for M-PAM VLC systems with dimming control

Belli, Roberto; Runge, Cristhof; Portugheis, Jaime; Finamore, Weiler A.

doi:10.1016/j.optcom.2021.127891

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…Just as the dimming level can be controlled by adjusting the duty cycle of the modulated signal, it can be regulated by attaching a sequential '1' or '0' bit array to the main modulated signal. This attached array is referred to as Compensation Time (CT) (28). Addition to CT method, dimming compensator schemes have been also proposed to achieve dimmable VLC systems that are including forward error correction (FEC) techniques (29).…”

Section: Methodsmentioning

confidence: 99%

The Performance Comparison of SC-PPM Receiver Models

Sönmez

2023

Hittite Journal of Science and Engineering

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Visible light communication (VLC) technology has arisen as promising candidate to solve the critical challenges of wireless communication networks. In particular, the evolving explosion in use of internet services requiring high bandwidth will soon become a great potential problem among the service provider. Meanwhile, this paper describes a physical layer solution to provide data transmission in the VLC networks. In the paper, it is aim to examine the performance comparison of SC-PPM (Subcarrier Pulse Position Modulation) demodulator schemes. It is considered three receiver techniques to assemble the demodulator techniques to SC-PPM receiver system. Firstly, the traditional PPM (T-PPM) demodulator has been applied on the SC-4PPM receiver system to estimate the slot that includes high frequency signal that is referred to as subcarrier signal. To successfully detect the bits by using traditional PPM receiver, it must be known the dimming level of received SC-4PPM signal. This is a serious problem to ensure data transmission in the real-time VLC systems due to challenge of providing the variable dimming level knowledge at the receiver side. In another receiver model that is referred to as PD (Peak Detector), it is aim to detect peak values of slot with high frequency signal. The disadvantage of this system is that BER (Bit Error Rate) performance depends the difference between peak and bottom values of subcarrier filled slot. Hence, second method is improved to achieve the similar BER performance at all dimming levels between 12.5% and 87.5%. This receiver model is called as IPD in the paper

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Section: Methodsmentioning

confidence: 99%

The Performance Comparison of SC-PPM Receiver Models

Sönmez

2023

Hittite Journal of Science and Engineering

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“…It is assumed that all emitting surfaces are ideal Lambert diffuse reflections and the radiation pattern is independent of the angle of incidence of the light. Modeling reflections occurring on a micro-reflective surface with area dA and reflectivity ρ, There are two steps: the first step considers this micro-reflective surface as a receiver with area 𝑑𝐴 and calculates the optical power dP it receives; the second step treats this micro-reflective surface as an ideal Lambertian light source with ratios P=ρdP and n=1 [8] .…”

Section: Visible Optical Communication Channel Analysismentioning

confidence: 99%

“…where R is the distance between the light source and the receiver, which is represented by equation (8).…”

Section: Visible Optical Communication Channel Analysismentioning

confidence: 99%

Research on the equalization algorithm of indoor visible light communication

huang,

Li,

wang

et al. 2023

5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023)

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For multipath effects and frequency fading of channels in indoor visible light communication systems. In this paper, an improved LMS algorithm is proposed to compensate for the channel. First, the channel model of indoor visible light communication and the simulation model of orthogonal frequency division multiplexing (OFDM) are built.The simulation verifies the effect of eigenvalue distribution, filter order and step size on the LMS algorithm. Secondly, the NLMS algorithm proposed in this paper solves, to a certain extent, the inherent contradiction that the convergence speed and steady-state error of the LMS algorithm cannot be reasonably coordinated. The simulation results show that: The algorithm improves the convergence speed and reduces the computational complexity compared with the LMS algorithm, which effectively improves the performance of visible light communication systems.

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“…Bu yöntemler için ana problemlerden birisi hedef karartma seviyesinin ayarlanması olmuştur [13]. Genellikle yapılan çalışmalarda hedef karartma seviyesi, titreşimi önlemek için belirli bir süre aynı parlaklıkta veri iletiminin sağlanması için ayarlanmaktadır [14]. Literatürde hedef karartma seviyesini ayarlayabilmek için birçok yöntem geliştirilmiştir.…”

Section: Introductionunclassified

“…Modülasyon tabanlı yöntemler OOK ve PPM gibi şemaların geliştirilerek VOOK ve VPPM yöntemlerinin önerilmesi olarak ifade edilebilmektedir [15]. Kodlama tabanlı yöntemlerde ise kompanzasyon süresi (CT: Compansation Time) algoritmalarının geliştirilmesi ile birlikte uzun süreli '1' veya '0 ' bilgi paketinden sonra gönderilerek hedef karartma seviyesinin başarımı gerçekleştirilebilmektedir [14].…”

Section: Introductionunclassified

DH-PIM İletim Yöntemi için Bir Hata Düzeltme Yapısı

Sönmez

2022

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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In the study, the performance analysis of error correction structures has been investigated for the DH-PIM method which is proposed for optical communication systems. A suitable system model for erasure and false alarm errors are obtained to join the Visible Light Communication (VLC) Systems. A theoretical framework is given for the model in this paper. New digital circuit based architecture is improved for erasure error structure in a FPGA (Field Programmable Gate Arrays) complier Quartus. The results are investigated in the Modelsim-Altera simulator in terms of the time chart. According to obtained results, it is shown that proposed digital circuit based architecture can successfully correct the error slots. Additionally, the performance of slot error rate has been analyzed for both erasure and false alarm errors of which the theoretical frameworks are obtained. It is shown from results that erasure error correction system (S-DHPIM) has better slot error rate performance than that of traditional DH-PIM (G-DHPIM). Addition to this, it is indicated that DH-PIM with erasure and false alarm correction structure (SY-DHPIM) gives better slot error performance compared with the S-DHPIM.

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A capacity-approaching coding scheme for M-PAM VLC systems with dimming control

Cited by 5 publications

References 18 publications

The Performance Comparison of SC-PPM Receiver Models

The Performance Comparison of SC-PPM Receiver Models

Research on the equalization algorithm of indoor visible light communication

DH-PIM İletim Yöntemi için Bir Hata Düzeltme Yapısı

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