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A Novel Physics-based Channel Model for Reconfigurable Intelligent Surface-assisted Multi-user Communication Systems

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Document pages: 30 pages

Abstract: The reconfigurable intelligent surface (RIS) is one of the promisingtechnologies contributing to the next generation smart radio environment. Anovel physics-based RIS channel model is proposed. Particularly, we considerthe RIS and the scattering environment as a whole by studying the signal smultipath propagation, as well as the radiation pattern of the RIS. The modelsuggests that the RIS-assisted wireless channel can be approximated by a Riciandistribution. Analytical expressions are derived for the shape factor and thescale factor of the distribution. For the case of continuous phase shifts, thedistribution depends on the number of elements of the RIS and the observingdirection of the receiver. For the case of continuous phase shifts, thedistribution further depends on the quantization level of the RIS phase error.The scaling law of the average received power is obtained from the scale factorof the distribution. For the application scenarios where RIS functions as ananomalous reflector, we investigate the performance of single RIS-assistedmultiple access networks for time-division multiple access (TDMA),frequency-division multiple access (FDMA) and non-orthogonal multiple access(NOMA). Closed-form expressions for the outage probability of the proposedchannel model are derived. It is proved that a constant diversity order exists,which is independent of the number of RIS elements. Simulation results arepresented to confirm that the proposed model applies effectively to thephased-array implemented RISs.

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