Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: RIS-Assisted MISO Communication: Optimal Beamformers and Performance
  Analysis   We study a multiple-input single-output (MISO) communication system assisted
by a reconfigurable intelligent surface (RIS). A base station (BS) having
multiple antennas is assumed to be communicating to a single-antenna user
equipment (UE), with the help of a RIS. We assume that the system operates in
an environment with line-of-sight (LoS) between the BS and RIS, whereas the
RIS-UE link experiences Rayleigh fading. We present a closed form expression
for the optimal active and passive beamforming vectors at the BS and RIS
respectively. Then, by characterizing the statistical properties of the
received SNR at the UE, we apply them to derive analytical approximations for
different system performance measures, including the outage probability,
average achievable rate and average symbol error probability (SEP). Our
results, in general, demonstrate that the gain due to RIS can be substantial,
and can be significantly greater than the gains reaped by using multiple BS
antennas.

26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ