Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intelligent Reflecting Surfaces Assisted Secure Transmission Without
  Eavesdropper's CSI   In this letter, improving the security of an intelligent reflecting surface
(IRS) assisted multiple-input single-output (MISO) communication system is
studied. Different from the ideal assumption in existing literatures that full
eavesdropper's (Eve's) channel state information (CSI) is available, we
consider a more practical scenario without Eve's CSI. To enhance the security
of this system given a total transmit power at transmitter (Alice), we propose
a joint beamforming and jamming approach, in which a minimum transmit power is
firstly optimized at Alice so as to meet the quality of service (QoS) at
legitimate user (Bob), and then artificial noise (AN) is emitted to jam the
eavesdropper by using the residual power at Alice. Two efficient algorithms
exploiting oblique manifold (OM) and minorizationmaximization (MM) algorithms,
respectively, are developed for solving the resulting non-convex optimization
problem. Simulation results have been provided to validate the performance and
convergence of the proposed algorithms.

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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio