Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid Precoding Design for Reconfigurable Intelligent Surface aided
  mmWave Communication Systems   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.

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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat