Weight Threshold Check Coding for Dimmable Indoor Visible Light Communication Systems

Zuo, Yu; Zhang, Jian; Zhang, Yanyu; Chen, Ru-Han

doi:10.1109/jphot.2018.2844858

Cited by 18 publications

(11 citation statements)

References 18 publications

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“…Next, to compare the error performance of the various dimming schemes, we fixed the the peak light intensity of transmitted signal P for a fair comparison according to the literature [11,14]. The signal-to-noise ratio (SNR) can be defined as SNR = 10 log 10 [ 1 R c HP σ 2 ], where the code rate R c can be regarded as transmission efficiency here, and σ 2 is the variance of the AWGN.…”

Section: Simulation Resultsmentioning

confidence: 99%

A Novel Coding Based Dimming Scheme with Constant Transmission Efficiency in VLC Systems

Zuo

Zhang

2019

Applied Sciences

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Visible light communication (VLC) has attracted tremendous attention due to two functions: communication and illumination. Both reliable data transmission and lighting quality need to be considered when the transmitted signal is designed. To achieve the desired levels of illumination, dimming control is an essential technology applied in VLC systems. In this paper, we propose a block coding-based dimming scheme to construct the codeword set, where dimming control can be achieved by changing the ratio of two levels (ON and OFF) based on on-off keying (OOK) modulation. Simulation results show that the proposed scheme can maintain good error performance with constant transmission efficiency under various dimming levels.

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Section: Simulation Resultsmentioning

confidence: 99%

A Novel Coding Based Dimming Scheme with Constant Transmission Efficiency in VLC Systems

Zuo

Zhang

2019

Applied Sciences

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“…The performance of the four methods decreases as FOV increases. This is because when terminals are within FOV, the first derivative of the optical concentrator gain with respect to ϕ FOV satisfies g (ϕ FoV ) = −2n 2 cos ϕ FoV /sin 2 ϕ FoV , which is less than 0 according to Equation (2). Therefore, an increase in FOV will lead to a decrease in g(ϕ FoV ).…”

Section: Analysis On Average Required Data Ratementioning

confidence: 99%

“…Visible light communication (VLC) is an emerging wireless communication technology, which simultaneously achieves communication and illumination [1,2] and has the advantage of high speeds [3]. Due to the ubiquitous indoor light sources, visible light communication has become an attractive alternative to conventional radio communications for indoor environments [4].…”

Section: Introductionmentioning

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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“…In order to achieve the desired brightness levels for users, illuminance constraint should be satisfied [21]. The multi-color LED transmitter should maintain constant brightness level where the mixed white light should be unflickering, so the illuminance constraint can be expressed as…”

Section: Illumination and Communication Constraintsmentioning

confidence: 99%

“…MacAdam ellipse has been extensively used to describe the chromaticity specification for fluorescent lamps and solid state lighting products such as LEDs. American National Standards Institute (ANSI) suggests chromaticity tolerance for fluorescent lamps is defined by a 4-step MacAdam ellipse while a 7-step MacAdam ellipse can be used for solid state lighting [20], [21]. Although quadrangles instead of ellipses are applied for LEDs…”

Section: ) Quadrangle Chromaticity Constraintmentioning

confidence: 99%

Power Allocation Optimization Design for the Quadrichromatic LED Based VLC Systems with Illumination Control

Zuo

Zhang

2019

Crystals

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For requiring high communication rate and high-quality illumination, multi-color light-emitting diodes (LEDs) have been utilized in visible light communication (VLC) systems and attracted substantial research interests. It should be noted that multiple colors are not independent from each other since they are jointly limited by the chromaticity constraint. Thus, taking full consideration of the multi-color crosstalk problem and actual communication and illumination constraints, this paper formulates a power-efficient illumination control optimization design to reduce power consumption for the quadrichromatic LED (QLED) based VLC systems where signal to interference plus noise ratio (SINR) and quadrangle chromaticity tolerance region constraints should be satisfied. Simulation results illustrate that our proposed optimal power allocation strategy can significantly increase power efficiency for the VLC system compared with the uniform power allocation method. Moreover, the proposed scheme can provide optimal performance under different given correlated color temperature (CCT) values.

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Weight Threshold Check Coding for Dimmable Indoor Visible Light Communication Systems

Cited by 18 publications

References 18 publications

A Novel Coding Based Dimming Scheme with Constant Transmission Efficiency in VLC Systems

A Novel Coding Based Dimming Scheme with Constant Transmission Efficiency in VLC Systems

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

Power Allocation Optimization Design for the Quadrichromatic LED Based VLC Systems with Illumination Control

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