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We introduce the concept of frequency-mixing intelligent reflecting surface(FMx-IRS), where the elements of the surface continuously change the phases ofthe incident signals. In this way, the FMx-IRS acts as a frequency mixer andmakes the propagation environment nonlinear, thereby introducing newfrequencies. We study the basic features of the proposed concept anddemonstrate its advantages that stem from the novel type of control over thewireless propagation. The channel decoupling feature and the correlationbetween reflected channels are elaborated for the architecture, and arevalidated by the simulations.

Frequency-Mixing Intelligent Reflecting Surfaces for Nonlinear Wireless Propagation