Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconfigurable Intelligent Surface Aided Constant-Envelope Wireless
  Power Transfer   By reconfiguring the propagation environment of electromagnetic waves
artificially, reconfigurable intelligent surfaces (RISs) have been regarded as
a promising and revolutionary hardware technology to improve the energy and
spectrum efficiency of wireless networks. In this paper, we study a RIS aided
multiuser multiple-input single-output (MISO) wireless power transfer (WPT)
system, where the transmitter is equipped with a constant-envelope analog
beamformer. We formulate a novel problem to maximize the total received power
of all the users by jointly optimizing the beamformer at transmitter and the
phase shifts at the RISs, subject to the individual minimum received power
constraints of users. We further solve the problem iteratively with a
closed-form expression for each step. Numerical results show the performance
gain of deploying RIS and the effectiveness of the proposed algorithm.

30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin