Linear Optimal Signal Designs for Multi-Color MISO-VLC Systems Adapted to CCT Requirement

Xiao, Ye; Zhu, Yi-Jun; Zhang, Yanyu; Sun, Zhimei

doi:10.1109/access.2018.2882544

Cited by 4 publications

(5 citation statements)

References 38 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%

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%

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Viñals

Muñoz

Agustín

et al. 2020

Sensors

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“…where t is the intersection value of functions (10) and (11), i.e. the value of P opt,p /P opt,e at point (T p,0 , λ e 0 ).…”

Section: B Empirical Optical Model Of Phosphormentioning

confidence: 99%

Analysis and Modeling of Optical and Thermal Properties of Phosphor Converted White Light Emitting Diode

et al. 2019

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Based on the energy flow inside phosphor materials, a prediction model and its modeling method for the thermal effect and optical properties of phosphor converted white light emitting diode (LED) are proposed in this paper. With the phosphor characteristics (excitation wavelength, phosphor temperature, thickness, light absorption and conversion coefficients), it is possible to accurately quantify the heat dissipation coefficient and optical power of the white LED device, and then to estimate the emission power and luminous flux. The modeling consists of a series of optical and thermal evaluation, which are simple for LED designers to comply. Using samples of LED sources and phosphor material, the proposed prediction model has been validated in experiments, where good agreements between calculations and practical measurements have been achieved.

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“…If and only if u . Because the asymptotic complexity of the conventional inter-point method is N 3.5 u [31,32], the complexity of the proposed algorithm is lower than the inter-point method. Input: the information of terminals and Aps Output: the approximate optimal normalized resource ratio factor x i of each terminal for i = 1 : 1 : Nu calculate the break point σ i for terminal i end for j = 1 : 1 : N A do the following steps for Cell j constitute the break point vector σ j sort σ j in descending order and obtain σ j for k = 1 : 1 :…”

Section: Algorithm Description and Asymptotic Complexity Analysismentioning

confidence: 99%

“…We choose the inter-point method in references [31,32], the RDR-PA method in references [16][17][18] and the conventional uniform allocation method in references [21,22] as comparison methods.…”

Section: Conditionsmentioning

confidence: 99%

A Low-Complexity Resource Allocation Algorithm for Indoor Visible Light Communication Ultra-Dense Networks

Bai

Tang

2019

Applied Sciences

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In this paper, a low-complexity multi-cell resource allocation algorithm with a near-optimal system throughput is proposed to resolve the conflict between the high system throughput and low complexity of indoor visible light communication ultra-dense networks (VLC-UDNs). First, by establishing the optimal model of the resource allocation problem in each cell, we concluded that the problem is a convex optimization problem. After this, the analytic formula of the normalized scaling factor of each terminal for resource allocation is derived after reasonable approximate treatment. The resource allocation algorithm is subsequently proposed. Finally, the complexity analysis shows that the proposed algorithm has polynomial complexity, which is lower than the classical optimal inter-point method. The simulation results show that the proposed method achieves a improvement of 57% in performance in terms of the average system throughput and improvement of 67% in performance in terms of the quality of service (QoS) guarantee against the required data rate proportion allocation (RDR-PA) method.

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Linear Optimal Signal Designs for Multi-Color MISO-VLC Systems Adapted to CCT Requirement

Cited by 4 publications

References 38 publications

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Multi-User Precoder Designs for RGB Visible Light Communication Systems

Analysis and Modeling of Optical and Thermal Properties of Phosphor Converted White Light Emitting Diode

A Low-Complexity Resource Allocation Algorithm for Indoor Visible Light Communication Ultra-Dense Networks

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