Abstract: A metamaterial comprises a plurality of electrically controllable metamaterial units each comprising a varactor diode; the predetermined angle is an angle at which an electromagnetic wave is reflected from a surface of the metamaterial; there is an association relationship between the predetermined angle and the first phase difference; the method comprises: determining a first phase difference between electromagnetic waves reflected by two adjacent electrically controllable metamaterial units in a metamaterial based on a predetermined angle; determining a target capacitance of the varactor diode in each electrically controllable metamaterial unit based on the first phase difference; and adjusting a capacitance of the varactor diode in each electrically controllable metamaterial unit to the target capacitance.

Abstract: The present invention discloses a metamaterial, and a method and an apparatus for adjusting a frequency of the metamaterial. The metamaterial includes a substrate material, and an electrically controllable microstructure unit array disposed on the substrate material and including a plurality of electrically controllable microstructure units. Each electrically controllable microstructure unit includes an external metal structure, an internal metal structure, and a varactor diode. The internal metal structure and the external metal structure define a ring-shaped channel. The varactor diode is disposed in the ring-shaped channel of each electrically controllable microstructure unit, and is configured for adjusting an operating frequency of each electrically controllable microstructure unit according to a voltage applied across the varactor diode.

Abstract: The disclosure relates to an overlapped multiplexing modulation method, apparatus, and system.

Abstract: A method includes: receiving a to-be-decoded symbol sequence, where the to-be-decoded symbol sequence includes N symbols; dividing the received to-be-decoded symbol sequence into a first symbol sequence and a second symbol sequence; calculating first distances between the first symbol sequence and each of corresponding 2K ideal superimposed symbol sequences, and obtaining paths corresponding to relatively small distances based on the first distances; sequentially performing sequence detection on each symbol in the second symbol sequence based on the paths corresponding to the 2k-1 relatively small distances, calculating second distances between each symbol in the second symbol sequence and each ideal symbol sequence, and after the sequence detection is performed on a last symbol, obtaining an ideal symbol sequence corresponding to a minimum distance based on the second distances; and using the ideal symbol sequence corresponding to the minimum distance as an output symbol sequence.