Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unveiling the Importance of SIC in NOMA Systems: Part I -- State of the
  Art and Recent Findings   The key idea of non-orthogonal multiple access (NOMA) is to serve multiple
users simultaneously at the same time and frequency, which can result in
excessive multiple-access interference. As a crucial component of NOMA systems,
successive interference cancelation (SIC) is key to combating this
multiple-access interference, and is focused on in this letter, where an
overview of SIC decoding order selection schemes is provided. In particular,
selecting the SIC decoding order based on the users' channel state information
(CSI) and the users' quality of service (QoS), respectively, is discussed. The
limitations of these two approaches are illustrated, and then a recently
proposed scheme, termed hybrid SIC, which dynamically adapts the SIC decoding
order is presented and shown to achieve a surprising performance improvement
that cannot be realized by the conventional SIC decoding order selection
schemes individually.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph