Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Capacity of Wireless Powered Cognitive Relay Network with
  Interference Alignment   In this paper, a two-hop decode-and-forward cognitive radio system with
deployed interference alignment is considered. The relay node is
energy-constrained and scavenges the energy from the interference signals. In
the literature, there are two main energy harvesting protocols, namely,
time-switching relaying and power-splitting relaying. We first demonstrate how
to design the beamforming matrices for the considered primary and secondary
networks. Then, the system capacity under perfect and imperfect channel state
information scenarios, considering different portions of time-switching and
power-splitting protocols, is estimated.

15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph