  This article presents a novel solution for reconfigurable intelligent
surfaces (RISs) based on cascaded channel decoupling. The proposed mechanism
simplifies the RIS regulation matrix, by decomposing the electromagnetic wave
regulation process into two sub-processes: virtual receiving response and
virtual regular transmission, which leads to the decoupling of the RIS cascaded
channel. This article further discusses the concrete implementation of the
proposed channel decoupling mechanism in two scenarios of single-user access
and multi-user access, and gives the corresponding detailed scheme. The
numerical simulation results demonstrate that the proposed channel decoupling
scheme is a low-complexity and effective solution for resolving the RIS
regulation matrix.
