Fig. 6: Results for assessing the crosstalk in the dual-channel 16QAM. | Nature Communications

Fig. 6: Results for assessing the crosstalk in the dual-channel 16QAM.

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

Fig. 6

a, b The measured constellation diagrams in the two groups of experiments, where the received and reference symbols are represented by the blue square and red circular markers, respectively. a The diagrams in the first group of experiments where sixteen different symbols are sent to user 1 and the same symbols coded as “0000” to user 2. b The diagrams in the second group of experiments where sixteen different symbols are sent to user 2 and the same symbols coded as “0011” to user 1. c The cross-talk values of dual users.

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