Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Detection of Passive Eavesdroppers in the MIMO Wiretap Channel   The classic MIMO wiretap channel comprises a passive eavesdropper that
attempts to intercept communications between an authorized transmitter-receiver
pair, each node being equipped with multiple antennas. In a dynamic network, it
is imperative that the presence of an eavesdropper be determined before the
transmitter can deploy robust secrecyencoding schemes as a countermeasure. This
is a difficult task in general, since by definition the eavesdropper is passive
and never transmits. In this work we adopt a method that allows the legitimate
nodes to detect the passive eavesdropper from the local oscillator power that
is inadvertently leaked from its RF front end. We examine the performance of
non-coherent energy detection and optimal coherent detection, followed by
composite GLRT detection methods that account for unknown parameters. Numerical
experiments demonstrate that the proposed detectors allow the legitimate nodes
to increase the secrecy rate of the MIMO wiretap channel.

7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio