Multiuser scheme for indoor visible light communications using RGB LEDs

Luna-Rivera, J. M.; Pérez‐Jiménez, Rafael; Rabadan-Borjes, J.A; Rufo, Julio; Guerra, Víctor; Suarez-Rodriguez, Cristo

doi:10.1109/iwobi.2014.6913949

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…RGB-based systems modify the intensity of the different color LEDs according to the information-bearing signal, for instance, using color Shift Keying (CSK) modulation [17] as in [16,[18][19][20][21][22][23][24]. Other RGB system designs allow the RGB system design to adapt to any target color [25][26][27][28][29][30]. Among previous works, the works in [23,24,26,27] deal with MU scenarios.…”

Section: The Channel Input Amplitudementioning

confidence: 99%

“…Other RGB system designs allow the RGB system design to adapt to any target color [25][26][27][28][29][30]. Among previous works, the works in [23,24,26,27] deal with MU scenarios. While in [23,26,27], the authors add MU capabilities through a time-based multiplexing approach, in [24], the authors propose a MU joint constellation design for VLC downlink broadcast channels.…”

Section: The Channel Input Amplitudementioning

confidence: 99%

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Multi-User Precoder Designs for RGB Visible Light Communication Systems

Viñals

Muñoz

Agustín

et al. 2020

Sensors

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In this paper, we design linear precoders for the downlink of a visible light communication (VLC) system that simultaneously serves multiple users. Instead of using phosphor-coated white light-emitting diodes (PWLEDs), we focus on Red-Green-Blue light-emitting diodes (RGB-LEDs) that allow modulating three separate data streams on the three primary colors of the RGB-LEDs. For this system, we design a zero-forcing (ZF) precoder that maximizes the weighted sum rate for a multilevel pulse amplitude modulation (M-PAM). The precoding design in RGB-based systems presents some challenges due to the system constraints, such as the limited power, the non-negative amplitude constraints per light-emitting diode (LED), and the need to guarantee white light emission while transmitting with RGB-LEDs. For comparison purposes, we also consider the ZF design for a PWLED-based system and evaluate the performance of both a PWLED- and an RGB-based system.

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Section: The Channel Input Amplitudementioning

confidence: 99%

Section: The Channel Input Amplitudementioning

confidence: 99%

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Viñals

Muñoz

Agustín

et al. 2020

Sensors

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“…A DC bias is usually added to the transmitted signals to make them non-negative [48,49]. Color-shift keying modulation over tri-band (red-green-blue) LEDs using code division multiple access (CDMA) is proposed to support multiple users in [50,51]. Tri-band LEDs can improve the data rate and increase the channel capacity by individually modulating the three color channels, tripling the throughput compared to single color LEDs.…”

Section: Literature Reviewmentioning

confidence: 99%

Indoor visible light communications, networking, and applications

et al. 2019

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Light-emitting diodes (LEDs) are changing indoor wireless communications. Visible light communications (VLC) that use LEDs as transmitters is an emerging research area and has significant commercial potential. The light emitted from LEDs can simultaneously carry information and provide illumination. Due to the intrinsic characteristics of light, VLC is more secure, more power efficient, and can provide higher network data transmission rates than radio frequency communications. This paper describes state-of-the-art VLC systems including transmitters, receivers, and channel models. Modulation and networking algorithms for physical layer and cross-layer designs are discussed. These algorithms are designed considering practical constraints, such as the bandlimited channel, illumination requirements, and transmitted power limitations. Indoor localization algorithms are proposed, with a particular focus on fingerprinting. In addition, this paper introduces practical applications of VLC in many fields such as national defense, healthcare, robotics, and vehicle-tovehicle communications. The paper concludes with a discussion of the challenges, opportunities, and future of VLC. Nomenclature ACO-OFDM asymmetrically clipped optical OFDM APD avalanche photodiode BER bit error rate CDMA code division multiple access CEO-OFDM clipping-enhanced optical OFDM DCO-OFDM DC-biased optical OFDM HCM Hadamard coded modulation IoT internet of things JOW joint optimal waveform LED light-emitting diodes LOS line-of-sight MAI multiple access interference MIMO multiple input multiple output NLOS non-line-of-sight OCDMA optical code division multiple access OFDM orthogonal frequency division multiplexing OOC optical orthogonal code OPEN ACCESS RECEIVED

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“…Furthermore, an aggregate data rate of 6.36 Gb/s has been reported over the same distance, employing a multiple-input multiple-output (MIMO) VLC system [8]. There are many more RGB WDM VLC systems and techniques published in prior art [9][10][11][12][13], however, none of these reportes commentate on the colour mixing capabilities of the LEDs to produce white light with respect to spatial link properties. This paper aims to investigate the ability of WDM with an RGB LED for the VLC system.…”

Section: Introductionmentioning

confidence: 99%

Investigation of WDM VLC Using Standard 5 mm RGB LEDs

Burton

Zvánovec

Ghassemlooy

et al. 2018

2018 11th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

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This paper investigates wavelength division multiplexing (WDM) uisng standard off-the shelf commercial 5 mm red, green, blue chip light-emitting diodes for visible light communications (VLC). From the initial observations of the illuminance footprint, it is found that the illumination overlap from each of the three colours is difficult to achieve a white light due to the physical layout of the emitting elements. We experimentally demonstrate that WDM is only achievable with a horizontal misalignment of +/-0.5 cm or +/-2 cm of the origin at a transmission span of 10 and 40 cm. Furthermore, with respect to the angular misalignment, WDM is achievable within a cone area of +5 o of the origin at 10 cm distance and only along the origin at a distance of 40 cm.

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Multiuser scheme for indoor visible light communications using RGB LEDs

Cited by 11 publications

References 12 publications

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Indoor visible light communications, networking, and applications

Investigation of WDM VLC Using Standard 5 mm RGB LEDs

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