Theoretical and Experimental Analysis of Asymmetrically Clipped-FSK VLC System

• Published in: IEEE photonics journal Vol. 14; no. 3; pp. 1 - 9
• Main Authors: Khan, Muhammad Jehangir, Azim, Ali W., Le Guennec, Yannis, Maury, Ghislaine, Ros, Laurent
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-06-2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); Institute of Electrical and Electronics Engineers (IEEE)
• Subjects: Asymmetry; Bit error rate; Commercial off-the-shelf technology; Communications systems; Discrete cosine transform; energy efficient modulation; Engineering Sciences; Euclidean distance; Euclidean geometry; Frequency shift keying; Frequency-domain analysis; Harmonic analysis; Harmonics; intensity modulation and direct detection; Keying; Modulation; Optical communication; Performance evaluation; Receivers; Signal and Image processing; Software radio; Symbols; visible light comm- unication; energy efficient modulation; Frequency-shift keying; visible light communication; intensity modulation and direct detection
• ISSN: 1943-0655; 1943-0655; 1943-0647
• DOI: 10.1109/JPHOT.2022.3165439

In this article, energy efficient asymmetrically clipped frequency-shift keying (AC-FSK) based visible light communication (VLC) system is theoretically and experimentally demonstrated. In order to facilitate straightforward comparison with the experimental results, theoretical expression for bit error probability, based on the Euclidean distance analysis of AC-FSK symbols, is provided. The VLC setup is based on commercial off-the-shelf components and software defined radio. The bit error rate (BER) performance of AC-FSK is evaluated considering maximum likelihood (ML) receiver, 1-tap discrete cosine transform (DCT) based receiver and frequency-domain harmonic receiver. Simulation and experimental results reveal that the performance of harmonic and ML receivers is almost identical. On the other hand, considering harmonic receiver for both AC-FSK and state-of-the-art unipolar (U)-FSK, we also gather that the BER performance of both schemes is almost the same. However, the harmonic receiver complexity of AC-FSK is 41.6% and 33.3% less compared to that of U-FSK for modulation order <inline-formula><tex-math notation="LaTeX">M = 16</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX">M = 128</tex-math></inline-formula>, respectively. This is because unlike U-FSK, AC-FSK requires limited number of harmonics for its optimal operation.