Fig. 4: Implementation of the hybrid wireless communication system and its performance. | Nature Communications

Fig. 4: Implementation of the hybrid wireless communication system and its performance.

From: Solar-powered light-modulated microwave programmable metasurface for sustainable wireless communications

Fig. 4

a Indoor measurement set-up. b Schematic view of the SLMPM. c Zoomed view of the SLMPM unit cell. d–i Measured constellation diagrams of BPSK, BASK, QPSK, 8PSK, 8QAM and 16QAM schemes under no sunlight condition. j Original logo image of State Key Laboratory of Millimeter Waves. k–p Recovered images and constellation diagrams measured when the system implemented the QPSK scheme at different sunlight illumination intensities (23.1 mW/cm2, 116.7 mW/cm2, 162.6 mW/cm2). q Original logo image of Southeast University. r–w Recovered images and constellation diagrams measured when the system implemented the 8QAM scheme at different sunlight illumination intensities (23.1 mW/cm2, 65.4 mW/cm2, 143.7 mW/cm2). x Measured signal-to-noise ratio versus different sunlight illumination intensities. y Measured harvested energy versus different sunlight illumination intensities. LED light emitting diode, CSG carrier signal generator, SDR software-defined radio.

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