Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diversity-Multiplexing Tradeoff for the Multiple-Antenna Wire-tap
  Channel   In this paper the fading multiple antenna (MIMO) wire-tap channel is
investigated under short term power constraints. The secret diversity gain and
the secret multiplexing gain are defined. Using these definitions, the secret
diversitymultiplexing tradeoff (DMT) is calculated analytically for no
transmitter side channel state information (CSI) and for full CSI. When there
is no CSI at the transmitter, under the assumption of Gaussian codebooks, it is
shown that the eavesdropper steals both transmitter and receiver antennas, and
the secret DMT depends on the remaining degrees of freedom. When CSI is
available at the transmitter (CSIT), the eavesdropper steals only transmitter
antennas. This dependence on the availability of CSI is unlike the DMT results
without secrecy constraints, where the DMT remains the same for no CSI and full
CSI at the transmitter under short term power constraints. A zero-forcing type
scheme is shown to achieve the secret DMT when CSIT is available.

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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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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: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph