Space Frequency Polarization Division Multiplexing

The physical world of electromagnetics has always been inextricably linked to the digital world of information. Wireless communication systems based on metasurfaces are only applicable in single-polarization scenarios.

The capacity of transmitted information remains limited, as do transmission speeds. Based on anisotropic space-time-coding metasurfaces (STCMs), scientists created a frequency-polarization-division multiplexed wireless communication system and a space-frequency-polarization-division multiplexed wireless communication system. The scientists designed a reflection-type polarization-independent phase-controllable anisotropic STCM.

They validated the two systems’ real-time data transmission capabilities, confirming the viability of the proposed architectures. The researchers investigated how to modulate two baseband signals onto different polarization and harmonic frequency channels, resulting in multiplexed modulations.

Physicists demonstrated how to steer harmonic beams in two polarization directions by introducing different delay gradients into the control voltage sequences of two polarization channels. They can now realize space-frequency-polarization-division multiplexed modulations. The researchers created a frequency-polarization-division multiplexed wireless communication system and successfully transmitted two 480p resolution videos.

Compared to the former metasurface-based wireless communication systems, the proposal improves channel capacity and space utilization over previous metasurface-based wireless communication systems by employing space-frequency-polarization-division multiplexing. It provides a low-cost, high-integration scheme for constructing multiple-user collaborative wireless communication networks.

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