Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Ergodic Capacity of Underlay Cognitive Dual-Hop AF Relayed
  Systems under Non-Identical Generalized-K Fading Channels   The ergodic capacity of underlay cognitive (secondary) dual-hop relaying
systems is analytically investigated. Specifically, the amplify-and-forward
transmission protocol is considered, while the received signals undergo
multipath fading and shadowing with non-identical statistics. To efficiently
describe this composite type of fading, the well-known generalized-$K$ fading
model is used. New analytical expressions and quite accurate closed-form
approximations regarding the ergodic capacity of the end-to-end communication
are obtained, in terms of finite sum series of the Meijer's-$G$ function. The
analytical results are verified with the aid of computer simulations, while
useful insights are revealed.

32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom