Power efficient visible light communication systems under dimming constraint

Kim, Jin-Woo; Lee, Kwonhyung; Park, Hyuncheol

doi:10.1109/pimrc.2012.6362675

Cited by 13 publications

(4 citation statements)

References 13 publications

(15 reference statements)

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“…Due to the local character of light, the LoS component of the signal will be presented in most cases and the multi-path propagation, which becomes a problem in RF systems, will be negligible for visible light communication (VLC). 20,21 Compared with the above-mentioned positioning technologies, VLP has the advantages of higher localization accuracy, lower deployment cost, stronger anti-interference ability, and not need deploying additional positioning infrastructure, no electromagnetic interference, and access authentication. Besides, VLP system has been designed for RF- or electromagnetic-sensitive areas like hospitals and airports, and areas without RF signal coverage, such as tunnels and underground mines.…”

Section: Introductionmentioning

confidence: 99%

Light positioning: A high-accuracy visible light indoor positioning system based on attitude identification and propagation model

Wang

Luo

Men

et al. 2018

International Journal of Distributed Sensor Networks

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With the booming development of green lighting technology, visible light-based indoor localization has attracted a lot of attention. Visible light-based indoor positioning technology leverages a light propagation model to pinpoint target location. Compared with the radio localization technology, visible light-based indoor positioning not only can achieve higher location accuracy, but also no electromagnetic interference. In this article, we propose LIPOS, a three-dimensional indoor positioning system based on attitude identification and visible light propagation model. The LIPOS system takes advantage of the existing lighting infrastructures to localize mobile devices that have light-sensing capabilities (e.g. a smartphone) using light emitting diode lamps as anchors. The system can accurately identify the attitude of a smartphone using its integrated sensors, distinguish different light emitting diode beacons using the fast Fourier transform algorithm, construct a position cost-function based on a visible light radiative decay model, and apply a nonlinear optimizing method to acquire the optimal estimation of final location. We have implemented the LIPOS system and evaluated it with a small-scale hardware testbed, as well as moderate-sized simulations. Extensive experiments are performed in three representative indoor environments-open-plan office, cubicle, and corridor, which not only demonstrate that the LIPOS can effectively avoid the negative effects of dynamic change of a smartphone's attitude angle, but also show better locating accuracy and robustness, and obtain sub-meter level positioning accuracy.

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Section: Introductionmentioning

confidence: 99%

Light positioning: A high-accuracy visible light indoor positioning system based on attitude identification and propagation model

Wang

Luo

Men

et al. 2018

International Journal of Distributed Sensor Networks

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“…A 2×2 non-imaging MIMO 4-ary quadrature amplitude modulation (4-QAM) VLC system based on nyquist single carrier [11], [12] is demonstrated. This N-SC-FDE scheme has the similarity of spectral efficiency performance to the multicarrier modulation scheme, i.e., OFDM, and with a reduced calculation complexity compared with traditional SC scheme based on time domain equalization.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of High-Speed 2 × 2 Non-Imaging MIMO Nyquist Single Carrier Visible Light Communication With Frequency Domain Equalization

Wang¹,

Chi

2014

J. Lightwave Technol.

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We experimentally demonstrate a high-speed 2 × 2 non-imaging multiple-input multiple-output nyquist single carrier visible light communication system. Two commercially available blue light emitting diodes with 3 dB electrical bandwidth of 10 MHz and two avalanche photo diodes with 3 dB electrical bandwidth of 100 MHz are used as transmitters and receivers, respectively. A frequency domain equalization method based on two pairs of time-multiplexed training symbols is proposed, which allows demultiplexing and post-equalization simultaneously processing in one step. Frequency domain averaging and time-domain averaging are also implemented and analyzed in this paper. In this demonstration, the overall data rate is 500 Mb/s. The measured bit error rates for two receivers are both below the 7% pre-forward-errorcorrection threshold of 3.8 × 10 −3 after 40 cm free-air transmission. Index Terms-Light emitting diode (LED), multiple input multiple output (MIMO), single carrier frequency domain equalization (SC-FDE), visible light communication (VLC).

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“…Inverse source coding (ISC) was reported to outperform the time-multiplexed OOK and achieve the theoretical data rate bound asymptotically in a noise-free environment [31,32]. Multiple PPM was proposed to have as much rate support as ISC [30,33,34]. Color-shift keying (CSK) [26,35,36] positions the signal constellation according to color and controls dimming by the signal amplitude (optical power) for multicolored VLC.…”

Section: Introductionmentioning

confidence: 99%

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Yun

Lee

Ahn

et al. 2014

Journal of the Optical Society of Korea

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Visible light communications (VLC) using the intensity modulation of light-emitting diodes (LEDs) provides a new communication medium to overcome the shortage of radio spectrum, and allows reuse of LED lighting infrastructures. Orthogonal frequency-division multiplexing (OFDM) was introduced to VLC for its merits in mitigating the fading effects resulting from delay spread, and in avoiding low-frequency ambient interference. Noise and clipping are two major factors that degrade the performance of OFDM in VLC. A larger signal easily overcomes noise, but experiences impairment by clipping. Therefore, degradation due to clipping has a trade-off relationship with that due to noise, depending on the signal amplitude of OFDM. In this paper, the optimal signal amplitude in the trade-off is obtained by simulation when the dimming and LED intensity are given. The former indicates a user's requirement for lighting, and the latter represents the channel quality. The required LED intensity-to-noise ratio, as the channel quality that guarantees dimming as well as an adequate bit-error rate (BER), is also discussed.

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Power efficient visible light communication systems under dimming constraint

Cited by 13 publications

References 13 publications

Light positioning: A high-accuracy visible light indoor positioning system based on attitude identification and propagation model

Light positioning: A high-accuracy visible light indoor positioning system based on attitude identification and propagation model

Demonstration of High-Speed 2 × 2 Non-Imaging MIMO Nyquist Single Carrier Visible Light Communication With Frequency Domain Equalization

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

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