Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intelligent Reflecting Surface Aided Multiple Access Over Fading
  Channels   This paper considers a two-user downlink transmission in intelligent
reflecting surface (IRS) aided network over fading channels. Particularly,
non-orthogonal multiple access (NOMA) and two orthogonal multiple access (OMA)
schemes, namely, time division multiple access (TDMA) and frequency division
multiple access (FDMA), are studied. The objective is to maximize the system
average sum rate for the delay-tolerant transmission. We propose two adjustment
schemes, namely, dynamic phase adjustment and one-time phase adjustment. The
power budget, minimum average data rate, and discrete unit modulus reflection
coefficient are considered as constrains. To solve the problem, two phase
shifters adjustment algorithms with low complexity are proposed to obtain near
optimal solutions. With given phase shifters and satisfaction of time-sharing
condition, the optimal resource allocations are obtained using the Lagrangian
dual decomposition. The numerical results reveal that: i) the average sum rate
of proposed NOMA network aided by IRS outperforms the conventional NOMA network
over fading channels; ii) with continuous IRS adjustment in the fading block,
the proposed TDMA scheme performs better than the FDMA scheme; iii) increasing
the minimum average user rate requirement has less impact on the proposed
IRS-NOMA system than on the IRS-OMA system.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn