Hybrid Frequency and Phase-Shift Keying Modulation for Energy Efficient Optical Wireless Systems

• Published in: IEEE wireless communications letters Vol. 9; no. 4; pp. 429 - 432
• Main Authors: Azim, Ali Waqar, Le Guennec, Yannis, Ros, Laurent
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-04-2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); IEEE comsoc
• Subjects: Bit error rate; Computer Science; Euclidean geometry; Frequency shift keying; intensity modulation-direct detection; Internet-of-Things; Modulation; Optical wireless; Optical wireless system; Phase shift keying; Receivers; Signal and Image Processing; Waveforms; Wireless communication; Internet-of-Things; phase-shift keying; frequency-shift keying; intensity modulation- direct detection; Optical wireless system
• ISSN: 2162-2337; 2162-2345
• DOI: 10.1109/LWC.2019.2954832

In this letter, we introduce direct-current (DC) offset hybrid frequency and phase-shift keying (DC-FPSK) modulation for Internet-of-Things based on optical wireless systems. For DC-FPSK, non-negative phase-modulated frequency waveforms are generated by combining frequency-shift keying (FSK), phase-shift keying (PSK) and a DC offset. We propose optimal maximum likelihood and sub-optimal receivers for DC-FPSK. The performance is appraised in terms of Euclidean distance, bit-error-rate (BER) performance and energy efficiency. We determine that combining 4-PSK with conventional DC-FSK is the optimal approach to enhance the energy and spectral efficiencies.