Chinese Optics Letters, 2024, 22 (3): 030101, Published Online: Mar. 18, 2024
Underwater wireless optical NOMA communication experiment system exploiting GaN-based micro-LED array grouping
optical non-orthogonal multiple access gallium nitride-based micro-LED array oceanic turbulence channels bit error rate
Abstract
This paper has proposed an experimental system for non-orthogonal multiple access (NOMA) wireless optical communication in challenging underwater turbulent environments, employing the gallium nitride (GaN)-based micro-LED array. This design of the GaN-based micro-LED array enables the independent transmission of signals from distinct data streams within the NOMA framework, facilitating direct optical power-domain superposition of NOMA signals. The experimental setup involves emulating oceanic turbulence channels, characterized by varying the level of scintillation intensity, to thoroughly investigate the bit error rate (BER) performance. The outcomes unequivocally demonstrate the superiority of our proposed NOMA scheme, as compared to conventional circuit-driven optical NOMA systems utilizing fixed LED array grouping, particularly in the presence of turbulent underwater channels. The proposed NOMA scheme exhibits consistently superior BER performance and maintains excellent linearity at the lower frequencies while effectively mitigating signal distortion at the higher frequencies.
Yanjun Liang, Hongxi Yin, An Huang, Xiuyang Ji, Jianying Wang. Underwater wireless optical NOMA communication experiment system exploiting GaN-based micro-LED array grouping[J]. Chinese Optics Letters, 2024, 22(3): 030101.