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Article

Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems

1
Department of Electronics, Telecommunications and Informatics, University of Aveiro, 3810-193 Aveiro, Portugal
2
Instituto de Telecomunicações, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
3
School of Technology and Management, Polytechnic of Leiria, 2411-901 Leiria, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Moschitta
Sensors 2021, 21(7), 2537; https://doi.org/10.3390/s21072537
Received: 27 February 2021 / Revised: 31 March 2021 / Accepted: 1 April 2021 / Published: 5 April 2021
(This article belongs to the Special Issue Visible Light Communication, Networking, and Sensing)
This paper presents a multi-user Visible Light Communication (VLC)-based Internet of Things (IoT) system using multi band-Carrierless Amplitude and Phase (m-CAP) modulation for IoT applications. The proposed system uses a digital m-CAP modulator embedded in a ceiling LED light fixture and analog receivers, aiming at low-cost, low-power, and small-sized IoT devices. The performance was evaluated in terms of the filtering stage design and the usage of guard bands. Different pairs of emitter and receiver filters were considered. While Bessel and Butterworth analog filters were tested in the analog receiver, the digital m-CAP modulator pulse shaping filter considered raised cosine filters, as well as digital matched filters for the analog Bessel and Butterworth filters. Regarding the guard bands, two approaches were considered: either by using the raised cosine roll-off factor (bandwidth compression) or by suppressing the even bands. The Bit Error Rate (BER) performance was obtained by simulation. The usage of the Bessel filter in the receiver, along with a digital matched filter, proved to be the best solution, achieving a BER lower than 103 for an Eb/No of 6 dB, using a third-order filter. Furthermore, guard bands should be used in order to mitigate inter-band interference in order to have improved performance when multiple users intend to simultaneously communicate. View Full-Text
Keywords: visible light communications; Internet of Things; m-CAP modulation visible light communications; Internet of Things; m-CAP modulation
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MDPI and ACS Style

Rodrigues, L.; Figueiredo, M.; Alves, L.N. Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems. Sensors 2021, 21, 2537. https://doi.org/10.3390/s21072537

AMA Style

Rodrigues L, Figueiredo M, Alves LN. Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems. Sensors. 2021; 21(7):2537. https://doi.org/10.3390/s21072537

Chicago/Turabian Style

Rodrigues, Luis, Mónica Figueiredo, and Luis N. Alves 2021. "Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems" Sensors 21, no. 7: 2537. https://doi.org/10.3390/s21072537

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