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All Journal Industrial Research Workshop and National Seminar
Nandini Ayu Ramadhani
Jurusan Teknik Elektro, Politeknik Negeri Bandung
Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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Design and Implementation of an SDR-Based VLC Transceiver Using Red Laser and Bias-Tee for Analog Signal Transmission Eril Mozef; Nandini Ayu Ramadhani; Candra Putra Ramadan; Novia Karostiani
Prosiding Industrial Research Workshop and National Seminar Vol. 17 No. 1 (2026): Prosiding 17th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v17i1.7201

Abstract

Software Defined Visible Light Communication (SDVLC) enables flexible and reconfigurable optical wireless communication through software-defined signal processing. This paper presents the design and implementation of an SDR-based VLC transceiver using a 650 nm red laser diode and bias-tee-based optical interfacing for analog signal transmission. The platform was validated by transmitting Amplitude Modulation (AM) and Frequency Modulation (FM) signals using two HackRF One SDR devices integrated with GNU Radio at a 10 MHz carrier frequency. The optical front-end comprises a red laser diode transmitter and a BPW34 photodiode receiver. Experiments were conducted indoors and outdoors under varying transmission distances and ambient lighting conditions. Successful analog optical transmission was achieved for both modulation schemes. FM outperformed AM, achieving an average Signal-to-Noise Ratio (SNR) of 76.50 dB versus 45.53 dB while showing greater robustness against optical attenuation and ambient light interference. The measured bandwidths were approximately 17 kHz for AM and 19 kHz for FM. Reliable communication was achieved over distances up to 9 m indoors and 6 m outdoors using a low-cost 6 mm, 5 mW red laser diode. These results verify the proposed SDR-based VLC transceiver for analog signal transmission, with FM providing superior performance.
Co-Authors Candra Putra Ramadan Eril Mozef Novia Karostiani