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