Wireless visible light communication technology using optical beamforming

Kim, Sung-Man; Kim, Seong–Min

doi:10.1117/1.oe.52.10.106101

Cited by 24 publications

(11 citation statements)

References 15 publications

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Section: Introductionmentioning

confidence: 99%

“…As a result, they can also be used for wireless optical communications, which is also called visible light communications (VLC) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. VLC has gained much attention as a strong candidate for future indoor wireless communication because of several advantages including its unregulated huge bandwidth (nearly 400 THz) and not causing electromagnetic interference [15]. Besides indoor wireless communications, VLC technology can be applied to other applications such as the VLC between a traffic light and a vehicle [16] or outdoor wireless optical communications also called free-space optical communication [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Kim

Lee

2015

Int J Communication

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In typical visible light communication (VLC) systems, light-emitting diodes (LEDs) are used as optical transmitters and photodiodes are used as optical receivers. Currently, many communication devices such as smart phones have a built-in LED lamp whereas they usually do not have a built-in photodiode. If we find a way to receive VLC signals without the need to add an additional photodiode on the communication devices, it will contribute to the spread of VLC. Therefore, we propose and demonstrate a VLC scheme without the need for a photodiode. As the first step, we investigate the characteristics of an LED as a VLC receiver and find out that an LED can also be used as a VLC receiver in certain conditions. Then, we demonstrate a half-duplex VLC system using an LED as both an optical transmitter and an optical receiver, without the need for a photodiode. This technique could be used in various applications such as the VLC between smart phones with a built-in LED lamp and the VLC between LED traffic lights.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Kim

Lee

2015

Int J Communication

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“…The SLM focuses the LED light on each user device according to the location and allotted time slot of each device. The location of user devices can be detected by using a location-detecting algorithm based on direction code, which has been proposed previously [15].…”

Section: Introductionmentioning

confidence: 99%

“…Optical beamforming is a technique to focus LED light on a desired target so that it can enhance the signal-to-noise ratio (SNR) of the received VLC signal [15,16]. Since it does not depend on electrical signal formats, it can be widely used in various VLC schemes.…”

Section: Introductionmentioning

confidence: 99%

Visible light communication using TDMA optical beamforming

Kim

Baek

Nahm

2017

J Wireless Com Network

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Optical beamforming is a technique to focus light-emitting diode (LED) light on a desired target and has been used to improve the performance of visible light communications (VLC). In this article, we propose and demonstrate a VLC technology based on time-division multiple access (TDMA) optical beamforming to accommodate multiple target devices. It focuses LED light on each different target device in each different time slot. Our results show that the proposed technique can accommodate multiple target devices and also gives the benefit of optical beamforming (5~10 dB gain) to each target device. Our results also show that the transmission distance increases from 110 to 200 cm with the TDMA optical beamforming.

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“…The LEDs are expected to play an increasingly important role in the lighting industry in the near future. Moreover, because the LEDs can easily switch and modulate electrical signals into lightwave signals at high speed, they can be used for visible light communication 1,2 and head-tracking techniques. 3 Numerous LED-based positioning systems have been reported by using image sensors, 4 fingerprinting, 5 correlation, 6 and time difference of arrival (TDOA) 7,8 so far.…”

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confidence: 99%

Indoor location awareness based on received signal strength ratio and time division multiplexing using light-emitting diode light

2014

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Abstract. We propose and demonstrate an indoor location awareness method for an autonomous robot vehicle using light-emitting diodes (LEDs). The location is estimated by measuring received signal strength ratio (RSSR), which is the relative ratio of optical powers detected between each LED and optical receiver. In this method, multiple LED lamps on the indoor ceiling are used, which can radiate light only during the individual time slot assigned to each of them. Using the RSSRs, circle or straight line equations are obtained and the crossing point among those equations determines the location of the object. In the experiment, four LED lamps are identified by time-division multiplexing with room dimensions of 1.0 × 1.0 × 1.3 m 3 , and the results show that the mean of the location error is 3.24 cm in the entire floor area.

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Wireless visible light communication technology using optical beamforming

Cited by 24 publications

References 15 publications

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Visible light communication using TDMA optical beamforming

Indoor location awareness based on received signal strength ratio and time division multiplexing using light-emitting diode light

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