Akademik Veri Yönetim Sistemi
WIRELESS PERSONAL COMMUNICATIONS, cilt.146, ss.1415-1441, 2026 (SCI-Expanded, Scopus)
This paper presents the comprehensive design, analysis, and simulation of a novel optical Directly Modulated Direct Detection Orthogonal Frequency Division Multiplexing (DM-DD-OFDM) system for Optical Wireless Communication (OWC). The proposed system is designed to operate at 15 Gbps, employing high-order Quadrature Amplitude Modulation (QAM) formats, specifically 4-QAM, 16-QAM, and 32-QAM. A principal innovation of this DM-DD-OFDM-OWC architecture is its design as a cost-effective solution, characterized by a compact form factor, low power consumption, and simplified implementation. This is achieved notably through the elimination of an external optical modulator at the transmitter. System performance was rigorously evaluated through the analysis of key metrics, including constellation diagrams, energy per bit to noise power spectral density ratio (Eb/No), Q-factor, eye diagrams, transmitter pointing error angle, operational wavelength, Error Vector Magnitude (EVM), power budget, and Bit Error Rate (BER) across varying OWC transmission ranges. Simulation results demonstrate that the system achieves excellent performance, supporting transmission over 500 km for 4-QAM. The higher-order formats, 16-QAM and 32-QAM, maintain a satisfactory link quality up to 200 km at a BER of approximately 10− 3. Furthermore, at wavelengths of 850 nm and 1550 nm, the system can transmit signals over distances of up to 1100 km and 850 km, respectively, while maintaining an EVM of approximately 40%. These findings position the proposed technology as a suitable candidate for application in inter-satellite optical wireless communication systems, particularly within Low Earth Orbit (LEO) constellations.