Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relay Selection to Improve Secrecy in Cooperative Threshold
  Decode-and-Forward Relaying   In this paper, relay selection is considered to enhance security of a
cooperative system with multiple threshold-selection decode-and-forward (DF)
relays. Threshold-selection DF relays are the relays in which a predefined
signal-to-noise ratio is set for the condition of successful decoding of the
source message. We focus on the practical and general scenario where the
channels suffer from independent non-identical Rayleigh fading and where the
direct links between the source and destination and source and eavesdropper are
available. Based on channel state information knowledge, three relay selection
strategies, namely traditional, improved traditional, and optimal, are studied.
In particular, the secrecy outage probability of all three strategies are
obtained in closed-form. It is found that the diversity of secrecy outage
probability of all strategies can improve with increasing the number of relays.
It is also observed that the secrecy outage probability is limited by either
the source to relay or relay to destination channel quality.

32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org