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Optical Camera Communications for IoT-Rolling-Shutter Based MIMO Scheme with Grouped LED Array Transmitter.

Shivani Rajendra Teli1, Vicente Matus2, Stanislav Zvanovec1

  • 1Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka, 16627 Prague, Czech Republic.

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Summary
This summary is machine-generated.

This study introduces a novel rolling-shutter (RS) based optical camera communication (OCC) system for the Internet of Things (IoT). It achieves flicker-free data transmission using a compact LED array, enabling reliable communication for various IoT applications.

Keywords:
Internet of thingslight-emitting diodesmultiple-input multiple-outputoptical camera communicationsrolling-shutter camera

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Area of Science:

  • Optical Camera Communications (OCC)
  • Wireless Sensor Networks
  • Internet of Things (IoT)

Background:

  • Optical Camera Communications (OCC) faces challenges in providing flicker-free illumination and high data rates simultaneously.
  • The rolling-shutter (RS) property of image sensors offers a potential solution for OCC receivers (Rx).

Purpose of the Study:

  • To propose and experimentally validate an RS-based multiple-input multiple-output (MIMO) OCC scheme tailored for Internet of Things (IoT) applications.
  • To demonstrate flicker-free transmission using a simplified multi-channel transmitter (Tx) design with a compact LED array.

Main Methods:

  • Implementation of a multi-channel transmitter (Tx) with a 7.2 × 7.2 cm^2, 8 × 8 distributed Light Emitting Diode (LED) array, utilizing LED grouping.
  • Experimental setup of an indoor OCC system employing a Raspberry Pi camera in RS capturing mode as the receiver (Rx).
  • Investigation of different multi-channel Tx configurations to extend communication range and data throughput.

Main Results:

  • Established flicker-free communication links ranging from 20-100 cm with data throughputs of 120-960 bps, suitable for IoT.
  • Extended communication link spans up to 1.8 m and achieved data throughputs of 13.44 kbps with optimized Tx configurations.
  • Measured peak signal-to-noise ratios of ~14-16 dB and successfully received bit rates of 81-99.4% at a 1 m link span for different shutter speeds (200-800 µs).

Conclusions:

  • The proposed RS-based MIMO OCC scheme effectively addresses the challenges of flicker-free illumination and data rate provision for IoT.
  • The system demonstrates feasibility for practical indoor IoT applications, offering adjustable performance through Tx configuration and camera settings.