Enhancement of Signal Performance in LED Visible Light Communications Using Mobile Phone Camera

Chow, Chi‐Wai; Chen, Chung-Yen; Chen, Shih Hao

doi:10.1109/jphot.2015.2476757

Cited by 118 publications

(64 citation statements)

References 14 publications

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“…Most of the conventional commercial cameras offer low sampling rates (around 30 frames per second). Hence, previous OCC demonstrations using rolling shutter cameras with low-frame rates and conventional intensity modulation schemes showed considerably low data rates [10,[19][20][21]. However, the OCC capacity can be significantly improved using cameras with high sampling rates.…”

Section: Pixel Sinrmentioning

confidence: 99%

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Performance Analysis and Improvement of Optical Camera Communication

et al. 2018

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Optical camera communication (OCC) is a technology in which a camera image sensor is employed to receive data bits sent from a light source. OCC has attracted a lot of research interest in the area of mobile optical wireless communication due to the popularity of smartphones with embedded cameras. Moreover, OCC offers high-performance characteristics, including an excellent signal-to-interference-plus-noise ratio (SINR), high security, low interference, and high stability with respect to varying communication distances. Despite these advantages, OCC suffers from several limitations, the primary of which is the low data rate. In this paper, we provide a comprehensive analysis of the parameters that influence the OCC performance. These parameters include the camera sampling rate, the exposure time, the focal length, the pixel edge length, the transmitter configurations, and the optical flickering rate. In particular, the focus is on enhancing the data rate, SINR, and communication distance, which are the principal factors determining the quality of service experienced by a user. The paper also provides a short survey of modulation schemes used in OCC on the basis of the achieved data rate, communication distance, and possible application scenarios. A theoretical analysis of user satisfaction using OCC is also rendered. Furthermore, we present the simulation results demonstrating OCC performance with respect to variations in the parameters mentioned above, which include the outage probability analysis for OCC.

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Section: Pixel Sinrmentioning

confidence: 99%

“…The majority of existing modulation techniques do not support high-data-rate communication. OOK, the most conventional scheme for OCC, was utilized in [10] achieving a data rate of 896 bps. However, several studies have already demonstrated healthy data rates by introducing new modulation techniques [12,22].…”

Section: Data Ratementioning

confidence: 99%

Performance Analysis and Improvement of Optical Camera Communication

et al. 2018

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“…In addition, it reduces extinction ratio and improves bit classification performance. (Chow, 2015) Second is the signal processing. The signal processing stage is a part that restores the original signal from the signal distorted by ISI and noise.…”

Section: -2 Receivermentioning

confidence: 99%

A Study on Optical Camera Communication using Gaussian Window

Park¹,

Shin²

2018

IJET

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Optical Camera Communication (OCC) is a Visible Light Communication (VLC) technique using a camera mounted on a digital device as a receiver. Nowadays, most digital devices are equipped with cameras using CMOS Image Sensors (CIS). In this paper, OCC is designed by using Rolling Shutter (RS), which is image output method of CIS. The transmitted data is captured using a camera application built in smartphone, and processed by MATLAB to restore the data. In this paper, we reduce the error rate by performing signal processing using Gaussian Window (GW) on the receiver side without using high-performance camera or directly controlling camera. In addition, we presented the avaliable range of transmission speed of OCC for indoor wireless communication and compared it with throughput in receiver side.

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“…We notice two sharp decrease, respectively at 5cm and 15cm. From 0 to near 5cm, the LED lightens the full surface of the CMOS sensor and the loss is mainly due to the SNR decrease and the blooming e ect [1]. The second, between 15 to 20cm, is less straightforward and we make few assumptions to explain the phenomena.…”

Section: Communication Goodputmentioning

confidence: 99%

“…Several similar approaches are presented in Sec. 2 below but our work is distinguished through the following contributions: (1) We provide the rst RLC coding scheme optimized for VLC and OCC. (2) We reduce the RLC overhead by using a pseudo-random linear coding (PRLC) method.…”

Section: Introductionmentioning

confidence: 99%