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This letter presents a detailed performance analysis of the intelligentreflecting surface (IRS) aided single-input single-output communicationsystems, taking into account of the direct link between the transmitter andreceiver. A closed-form upper bound is derived for the ergodic capacity, and anaccurate approximation is obtained for the outage probability. In addition,simplified expressions are presented in the asymptotic regime. Numericalresults are provided to validate the correctness of the theoretical analysis.It is found that increasing the number of reflecting elements can significantlyboost the ergodic capacity and outage probability performance, and a strongline-of-sight component is also beneficial. In addition, it is desirable todeploy the IRS close to the transmitter or receiver, rather than in the middle.

Performance Analysis of Intelligent Reflecting Surface Aided Communication Systems