Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sharing the Licensed Spectrum of Full-Duplex Systems using Improper
  Gaussian Signaling   Sharing the spectrum with in-band full-duplex (FD) primary users (PU) is a
challenging and interesting problem in the underlay cognitive radio (CR)
systems. The self-interference introduced at the primary network may
dramatically impede the secondary user (SU) opportunity to access the spectrum.
In this work, we attempt to tackle this problem through the use of the
so-called improper Gaussian signaling. Such a signaling technique has
demonstrated its superiority in improving the overall performance in
interference limited networks. Particularly, we assume a system with a SU pair
working in half-duplex mode that uses improper Gaussian signaling while the FD
PU pair implements the regular proper Gaussian signaling techniques. First, we
derive a closed form expression for the SU outage probability and an upper
bound for the PU outage probability. Then, we optimize the SU signal parameters
to minimize its outage probability while maintaining the required PU
quality-of-service based on the average channel state information. Finally, we
provide some numerical results that validate the tightness of the PU outage
probability bound and demonstrate the advantage of employing the improper
Gaussian signaling to the SU in order to access the spectrum of the FD PU.

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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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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: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int