Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Fundamental Limits of Interweaved Cognitive Radios   This paper considers the problem of channel sensing in cognitive radios. The
system model considered is a set of N parallel (dis-similar) channels, where
each channel at any given time is either available or occupied by a legitimate
user. The cognitive radio is permitted to sense channels to determine each of
their states as available or occupied. The end goal of this paper is to select
the best L channels to sense at any given time. Using a convex relaxation
approach, this paper formulates and approximately solves this optimal selection
problem. Finally, the solution obtained to the relaxed optimization problem is
translated into a practical algorithm.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
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The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat