Data rate enhancement of optical camera communications by compensating inter-frame gaps

Nguyen, Duy Thong; Park, Yong Il

doi:10.1016/j.optcom.2017.02.068

Cited by 25 publications

(19 citation statements)

References 5 publications

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“…It is assumed that a bit error occurs when more than half rows of r 0 or r 1 are in error. The parameter r 1 ÷ (r 0 + r 1 ) corresponds to the brightness, and P b is minimum when r 0 = r 1 , meaning 50% brightness in equation (4). Then, the performance degrades when it deviates from 50%, which is proved by experiments in the next section.…”

Section: Data Rate and Performance Estimationmentioning

confidence: 68%

“…Due to the detection mechanism of OCC, the larger n row guarantees the higher signal-to-noise ratio (SNR) [4]. If a bit period is smaller than an exposure time, then the camera cannot distinguish the ON/OFF states of the signal, causing inter-symbol interference.…”

Section: A Operation Of Occmentioning

confidence: 99%

“…If a bit period is smaller than an exposure time, then the camera cannot distinguish the ON/OFF states of the signal, causing inter-symbol interference. The data rate of the OCC system is also affected by the frame rate and the inter-frame gap (IFG) [4], [5].…”

Section: A Operation Of Occmentioning

confidence: 99%

“…Especially, as the transmission distance increases the number of received bits per a frame reduces due to reduced power at the edge of the image sensor, causing more bit loss in the IFG [5]. It should be considered in the structure of the sub-packet as demonstrated in [4] and [5]. A sub-packet comprises a start frame bit (SF), a bit sequence number (BSN) and a payload as shown in Fig.…”

Section: Packet Structure Of the Hybrid Vlc/occmentioning

confidence: 99%

“…Performance of the hybrid VLC/OCC system changes with the brightness of the LED lamp decided by the VPPM modulation. The bit error probability of hybrid OCC, P b , is estimated as in equation (4).…”

Section: Data Rate and Performance Estimationmentioning

confidence: 99%

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VLC/OCC Hybrid Optical Wireless Systems for Versatile Indoor Applications

et al. 2019

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In this paper, a hybrid scheme for optical wireless communications using LED lamps is proposed. This scheme allows both visible light communication (VLC) using photodetectors and optical camera communication (OCC) using image sensors of a camera to receive light signals from the same transmitter simultaneously. High-frequency signals are received by VLC, while low-frequency signals are received by OCC. This hybrid transmission system enables the provision of versatile indoor services and allows users to receive data regardless of their device. It reduces the deployment cost of an indoor optical wireless system since the proposed system can provide both services using one LED lamp. To use the dimming property of LED lamps, a variable pulse position modulation scheme is used for OCC, while Manchester coding is used in VLC to avoid flickering. The measurement shows that the transmission distance reaches more than 4 m for both services. Performance analysis and experimental results are presented. INDEX TERMS Visible light communications, optical camera communications, variable pulse position modulation, VLC/OCC hybrid.

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Section: Data Rate and Performance Estimationmentioning

confidence: 68%

Section: A Operation Of Occmentioning

confidence: 99%