Wireless Communication through Frequency Modulating Reflective Intelligent Surfaces
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A novel frequency modulating reflecting intelligent surface (FM-RIS)-aided system has been proposed in this paper. In contrast with conventional RIS, elements over FM-RIS continuously manipulate phases of incident signals, and act as frequency modulators with a given frequency. Therefore, the signal received at FM-RIS is spread and transmit over a new frequency band uniquely associated to the surface, making the channels reflected from different FM-RISs separable in frequency domain. This paper studies the basic features of the proposed architecture, and demonstrates the advantages of it in terms of channel decoupling and channel estimation. The achievable spectral efficiency (SE) and the power scaling laws of FM-RIS-aided system are elaborated for large scaling systems in presence of a multiuser scenario. Simulations validate the accuracy of our analysis, and illustrate SE gain brought by FM-RIS compared with conventional mMIMO and conventional RIS-aided system.
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