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In this paper, we study how to jointly design the phase shift of cascadedmulti-IRSs and the precoding vector of the BS to improve the coverage in denseurban areas. We aim to maximize the signal-to-noise ratio (SNR) of the userequipment (UE) received signal by employing this method. However, it is aconstrained non-convex optimization problem and is NP-hard. In order to solvethis problem, we simplify it by utilizing the characteristic of the mmWavewireless system to decompose the optimization problem into multiplesub-optimization problems. By employing the asymptotic orthogonality ofwireless channel in mmWave system to solve the sub-optimization problems, wefinally yield a closed-form sub-optimal solution. The simulation results verifythat our solution can effectively improve the coverage of deep dense urbanareas.

A Cascaded Multi-IRSs Beamforming Method in mmWave Communication Systems