Conventional wireless communication schemes indiscriminately transmit information into the
whole space and pose inherent security risks. Recently, directional information modulation …

In current wireless communication systems, sophisticated attack strategies at the physical
layer—the electromagnetic wave signals carrying the information—leave traces in the …

Reconfigurable intelligent surface (RIS) has been widely discussed owing to its potential in
enhancing the communication performance in a low-cost and energy efficient manner. The …

Metasurface has provided unprecedented freedoms in manipulating electromagnetic (EM)
waves, exhibiting fascinating functions. Conventionally, these functions are implemented …

Security is a critical issue in wireless communication due to the broadcast nature of the
wireless environment; thus, physical-level secure wireless communication is of great …

In spatial domain signal processing, it is necessary to equip more antennas at the receiver to
improve spatial demultiplexing capability. However, increasing the number of antennas …

As a major approach for controlling electromagnetic (EM) waves, metamaterials have
experienced an abundant and rapid development in the 21st century. They have provided …

Vector vortex beams, encompassing orbital angular momentum (OAM) and polarization
states, have sparked considerable interest owing to their diverse potential applications …

With the advantage of programmable electromagnetic properties, Reconfigurable Intelligent
Surfaces (RISs) have drawn wide attention from both industry and academia. RIS-assisted …

This paper introduces a reconfigurable intelligent surface (RIS) engineered to enhance
communication channels regardless of the source and terminal positions. The unit can …