In this letter, we focus on the hybrid precoding (HP) design for the reconfigurable intelligent surface (RIS) aided multi-user (MU) millimeter wave (mmWave) communication systems. Specifically, we aim to minimize the mean-squared-error (MSE) between the received symbols and the transmitted symbols by jointly optimizing the analog-digital HP at the base-station (BS) and the phase shifts (PSs) at the RIS, where the non-convex element-wise constant-modulus constraints for the analog precoding and the PSs are tackled by resorting to the gradient-projection (GP) method. We analytically prove the convergence of the proposed algorithm and demonstrate the desirable performance gain for the proposed design through numerical results.
@article{arxiv.1912.00040,
title = {Hybrid Precoding Design for Reconfigurable Intelligent Surface aided mmWave Communication Systems},
author = {Chandan Pradhan and Ang Li and Lingyang Song and Branka Vucetic and Yonghui Li},
journal= {arXiv preprint arXiv:1912.00040},
year = {2019}
}