Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Active Learning and Supervised Transmission of Spectrum Sharing Based
  Cognitive Radios by Exploiting Hidden Primary Radio Feedback   This paper studies the wireless spectrum sharing between a pair of
distributed primary radio (PR) and cognitive radio (CR) links. Assuming that
the PR link adapts its transmit power and/or rate upon receiving an
interference signal from the CR and such transmit adaptations are observable by
the CR, this results in a new form of feedback from the PR to CR, refereed to
as hidden PR feedback, whereby the CR learns the PR's strategy for transmit
adaptations without the need of a dedicated feedback channel from the PR. In
this paper, we exploit the hidden PR feedback to design new learning and
transmission schemes for spectrum sharing based CRs, namely active learning and
supervised transmission. For active learning, the CR initiatively sends a
probing signal to interfere with the PR, and from the observed PR transmit
adaptations the CR estimates the channel gain from its transmitter to the PR
receiver, which is essential for the CR to control its interference to the PR
during the subsequent data transmission. This paper proposes a new transmission
protocol for the CR to implement the active learning and the solutions to deal
with various practical issues for implementation, such as time synchronization,
rate estimation granularity, power measurement noise, and channel variation.
Furthermore, with the acquired knowledge from active learning, the CR designs a
supervised data transmission by effectively controlling the interference powers
both to and from the PR, so as to achieve the optimum performance tradeoffs for
the PR and CR links. Numerical results are provided to evaluate the
effectiveness of the proposed schemes for CRs under different system setups.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph