Turbo-DC-FPSK: a joint turbo coding and FPSK based modulation scheme adapted to optical wireless communications
Résumé
This letter proposes and analyzes a flexible and energy efficient technique for Optical Wireless Communication (OWC) systems. It involves the Direct Current-Frequency and Phase Shift Keying (DC-FPSK) modulation combined with a very low complexity convolutional code in a parallel scheme at the transmitter side, and a turbo-decoder at the receiver side, i.e. Bahl, Cocke, Jelinek and Raviv (BCJR) algorithm. It is an adaptation of the coplanar turbo-FSK technique developed for the long range low power Radio-Frequency (RF) context to the OWC requirements, to be compatible with Intensity-Modulation Direct Detection (IM-DD) techniques (real positive base-band waveforms including a Direct Current (DC) component instead of complex waveforms). Simulation results show that turbo-DC-FPSK can achieve around 5 dB energy gain over regular OWC state-of-the-art DC-FPSK modulation at a BER = 10-4. Using the number of linear modulation states as degrees of freedom, a flexibility in the desired balance between energy efficiency and spectral efficiency is achieved.
Mots clés
Frequency and Phase Shift Keying (FPSK) Intensity Modulation and Direct Detection (IM-DD) Optical Wireless Communication (OWC) turbo coding Discrete Fourier Transform (DFT)
Frequency and Phase Shift Keying (FPSK)
Intensity Modulation and Direct Detection (IM-DD)
Optical Wireless Communication (OWC)
turbo coding
Discrete Fourier Transform (DFT)
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