Fig. 5: Selected measurements in the dual-channel 16QAM scheme. | Nature Communications

Fig. 5: Selected measurements in the dual-channel 16QAM scheme.

From: Two-dimensional and high-order directional information modulations for secure communications based on programmable metasurface

Fig. 5: Selected measurements in the dual-channel 16QAM scheme.The alternative text for this image may have been generated using AI.

a The phases and b magnitudes of the signals in the target users. c The radiation patterns d and phases of fields in the φ = 0° plane. e The radiation patterns f and phases of fields in the φ = 90° plane. g The optimized coding sequences of the 8 × 8 PM that implements the dual-channel 16QAM. (S1: − 90°, S2: 0°, S3: 90°, S4: 180°).

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