Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Outage Analysis of Multi-Relay Selection for Cognitive Radio with
  Imperfect Spectrum Sensing   In this paper, we examine the outage performance of a cognitive relay
network, which is comprised of a secondary transmitter (ST), multiple
decode-and-forward (DF) relays and a secondary destination (SD). We propose a
multi-relay selection scheme for the cognitive relay network, where multiple
relays are selected and used to participate in forwarding the secondary
transmission from ST to SD. A closed-form expression of the outage probability
for the proposed multi-relay selection under imperfect spectrum sensing is
derived in Rayleigh fading environments. For comparison purposes, the
conventional direct transmission and the best-relay selection are also
considered as benchmarks. Numerical results show that as the spectrum sensing
performance improves with an increasing detection probability and/or a
decreasing false alarm probability, the outage probabilities of the proposed
multi-relay selection as well as the direct transmission and the best-relay
selection schemes all decrease accordingly. It is also demonstrated that the
proposed multi-relay selection significantly outperforms the conventional
approaches in terms of the outage probability.

26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph