Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Downlink Analysis for Reconfigurable Intelligent Surfaces Aided NOMA
  Networks   By activating blocked users and altering successive interference cancellation
(SIC) sequences, reconfigurable intelligent surfaces (RISs) become promising
for enhancing non-orthogonal multiple access (NOMA) systems. This work
investigates the downlink performance of RIS-aided NOMA networks via stochastic
geometry. We first introduce the unique path loss model for RIS reflecting
channels. Then, we evaluate the angle distributions based on a Poisson cluster
process (PCP) framework, which theoretically demonstrates that the angles of
incidence and reflection are uniformly distributed. Lastly, we derive
closed-form expressions for coverage probabilities of the paired NOMA users.
Our results show that 1) RIS-aided NOMA networks perform better than the
traditional NOMA networks; 2) the SIC order in NOMA systems can be altered
since RISs are able to change the channel gains of NOMA users.

16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con