Singh, Shivmanmeet, Narwant Singh Grewal, and Baljeet Kaur. “Analysis of Hybrid PDM-4QAM-OFDM for Inter-Satellite Mechatronic Telecommunication Using FSO System”. Opto-Electronics Review 31, no. 3 (March 13, 2026): e147036. Accessed April 17, 2026. https://wydawnictwo.pan.pl/index.php/opelre/article/view/481.