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In this letter, we study the wireless point-to-point communication from atransmitter (Tx) to a receiver (Rx), which is jointly aided by an activeintelligent reflecting surface (AIRS) and a passive IRS (PIRS). We consider twopractical transmission schemes by deploying the two IRSs in different orders,namely, Tx$\rightarrow$PIRS$\rightarrow$AIRS$\rightarrow$Rx (TPAR) andTx$\rightarrow$AIRS$\rightarrow$PIRS$\rightarrow$Rx (TAPR). Assumingline-of-sight channels, we derive the achievable rates for the two schemes byoptimizing the placement of the AIRS with the location of the PIRS fixed. Ouranalysis shows that when the number of PIRS elements and/or the AIRSamplification power is small, the AIRS should be deployed closer to the Rx inboth schemes, and TAPR outperforms TPAR with their respective optimizedAIRS/PIRS placement. Simulation results validate our analysis and show theconsiderable performance gain achieved by the jointly optimized AIRS/PIRSdeployment over the baseline double-PIRS system under the same power and IRSelement budgets.

Active and Passive IRS Jointly Aided Communication: Deployment Design and Achievable Rate