Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-Reliable Indoor Millimeter Wave Communications using Multiple
  Artificial Intelligence-Powered Intelligent Surfaces   In this paper, a novel framework for guaranteeing ultra-reliable millimeter
wave (mmW) communications using multiple artificial intelligence (AI)-enabled
reconfigurable intelligent surfaces (RISs) is proposed. The use of multiple
AI-powered RISs allows changing the propagation direction of the signals
transmitted from a mmW access point (AP) thereby improving coverage
particularly for non-line-of-sight (NLoS) areas. However, due to the
possibility of highly stochastic blockage over mmW links, designing an
intelligent controller to jointly optimize the mmW AP beam and RIS phase shifts
is a daunting task. In this regard, first, a parametric risk-sensitive episodic
return is proposed to maximize the expected bit rate and mitigate the risk of
mmW link blockage. Then, a closed-form approximation of the policy gradient of
the risk-sensitive episodic return is analytically derived. Next, the problem
of joint beamforming for mmW AP and phase shift control for mmW RISs is modeled
as an identical payoff stochastic game within a cooperative multi-agent
environment, in which the agents are the mmW AP and the RISs. Two centralized
and distributed controllers are proposed to control the policies of the mmW AP
and RISs. To directly find an optimal solution, the parametric functional-form
policies for these controllers are modeled using deep recurrent neural networks
(RNNs). Simulation results show that the error between policies of the optimal
and the RNN-based controllers is less than 1.5%. Moreover, the variance of the
achievable rates resulting from the deep RNN-based controllers is 60% less than
the variance of the risk-averse baseline.

2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga