A Gb/s VLC Transmission Using Hardware Preequalization Circuit

Huang, Xiaoxu; Shi, Jianyang; Li, Jie-Hui; Wang, Yiguang; Chi, Nan

doi:10.1109/lpt.2015.2445781

Cited by 71 publications

(31 citation statements)

References 13 publications

(9 reference statements)

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“…In the iterative algorithm, we set the iteration time n ite = 150 and the loop time n loop = 50 to obtain a trade-off between the complexity and precision. To extend the limited modulation bandwidth of commercial multi-color LEDs, the pre-equalization technology is utilized in our MIMO VLC system [32]. As shown in Figure 3, based on a single and cascaded bridged-T amplitude equalizer, the bandwidth of multiple color chips is extended to about 260 MHz from 100 MHz after the equalization.…”

Section: Simulation Resultsmentioning

confidence: 99%

Linear Precoding Designs for MIMO VLC Using Multi-Color LEDs under Multiple Lighting Constraints

2018

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Multiple-input multiple-output (MIMO) technology as an efficient approach to improve the transmission rate in visible light communication (VLC) has been well studied in recent years. In this paper, we focus on the MIMO VLC system using multi-color LEDs in the typical indoor scenario. Besides the correlation of the MIMO channel, the multi-color crosstalk interference and quadrangle chromaticity region are also considered to increase the practicality of this system. With the constraints of power, amplitude and chromaticity, an iterative algorithm to minimize mean-squared-error (MSE) is proposed to jointly design the precoder and equalizer. Our proposed algorithm provides an effective method to get the optimal precoder by updating optimization variables iteratively. As the equalizer matrix is fixed at each iteration, the main non-convex precoding design problem is transformed into a convex optimization problem and then solved. With the utilization of multi-color LEDs, our proposed precoding method would be promising to promote the practical applications of high-speed indoor optical wireless communication. Simulation results show that our proposed method owns better performance than conventional chromaticity-fixed schemes and zero-forcing precoding designs.

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Section: Simulation Resultsmentioning

confidence: 99%

Linear Precoding Designs for MIMO VLC Using Multi-Color LEDs under Multiple Lighting Constraints

2018

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“…Then, it is applied to a phosphorescent white LED (OSRAM, LCWCRDP.EC-KULQ-5L7N-1, luminous flux about 120 lm at 350 mA). The 3 dB bandwidth of this LED is about 17 MHz [13]. At the receiving end, two lenses are used for focusing light and two blue filters are used for filtering out the light's slow responding component and increasing modulation bandwidth.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Maximization of Visible Light Communication Capacity Employing Quasi-Linear Preequalization with Peak Power Limitation

Zhou

Shi

Wang

et al. 2016

Mathematical Problems in Engineering

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We propose quasi-linear preequalization to be used for high speed visible light communication (VLC) system. Compared with zero-forcing preequalization, this kind of preequalization method is more suitable for a real VLC experimental system with peak power limitation. We carry out simulations and experiments to test the performance of quasi-linear preequalization. With this equalizer, the 3 dB bandwidth of the system can be extended from 17 MHz to 450 MHz. We implement 2.32 Gbit/s phosphorescent white light-emitting diode (LED) VLC transmission over 1 m distance with quasi-linear equalizer, bit and power loading OFDM, differential amplification positive intrinsic negative diode (PIN) receivers, and maximum ratio combining algorithm. To our knowledge, this is the highest transmission data rate based on a phosphorescent white LED VLC system.

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“…Since currently available lighting LEDs are bandlimited to a few tens of MHz [90], the bandwidth of the overall VLC channel including the transmitter, indoor channel and receiver is dominated by the LED response. To improve the bandwidth efficiency and throughput, equalization algorithms including pre/post-equalizers have been proposed and applied in VLC systems [66,[91][92][93][94].…”

Section: M-pam Based Waveform Design For Multiuser Systemsmentioning

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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A Gb/s VLC Transmission Using Hardware Preequalization Circuit

Cited by 71 publications

References 13 publications

Linear Precoding Designs for MIMO VLC Using Multi-Color LEDs under Multiple Lighting Constraints

Linear Precoding Designs for MIMO VLC Using Multi-Color LEDs under Multiple Lighting Constraints

Maximization of Visible Light Communication Capacity Employing Quasi-Linear Preequalization with Peak Power Limitation

Indoor visible light communications, networking, and applications

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