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

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          Abstract

          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 10 3 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.

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          Most cited references54

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          A survey on sensor networks

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            Internet of Things in Industries: A Survey

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              Wireless infrared communications

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                05 April 2021
                April 2021
                : 21
                : 7
                : 2537
                Affiliations
                [1 ]Department of Electronics, Telecommunications and Informatics, University of Aveiro, 3810-193 Aveiro, Portugal; nero@ 123456ua.pt
                [2 ]Instituto de Telecomunicações, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; monica.figueiredo@ 123456ipleiria.pt
                [3 ]School of Technology and Management, Polytechnic of Leiria, 2411-901 Leiria, Portugal
                Author notes
                [* ]Correspondence: luis.abade@ 123456ua.pt
                Author information
                https://orcid.org/0000-0003-2593-3619
                https://orcid.org/0000-0002-0780-3725
                https://orcid.org/0000-0002-8071-9546
                Article
                sensors-21-02537
                10.3390/s21072537
                8038549
                777d069a-e4d8-4258-aa99-464d14da9846
                © 2021 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/).

                History
                : 27 February 2021
                : 01 April 2021
                Categories
                Article

                Biomedical engineering
                visible light communications,internet of things,m-cap modulation
                Biomedical engineering
                visible light communications, internet of things, m-cap modulation

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