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In this work, we consider a single input single output (SISO) system forReconfigurable Intelligent Surface (RIS) assisted mmWave communication. Weconsider Rician channel models over user node to RIS and RIS to Access Point(AP). We obtain closed form expressions for capacity with channel stateinformation (CSI) and without CSI at the transmitter. Newly derived capacityexpressions are closed form expressions in a very compact form. We alsosimplified the closed form expressions for average symbol error probability. Wealso characterize the impacts of key parameters Rician factor K and number ofelements on IRS on ergodic capacity with CSI and without CSI at thetransmitter.

Reconfigurable Intelligent Surfaces Aided Communication: Capacity and Performance Analysis Over Rician Fading Channel