Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Strengthened Cutset Upper Bound on the Capacity of the Relay Channel
  and Applications   We develop a new upper bound on the capacity of the relay channel that is
tighter than previously known upper bounds. This upper bound is proved using
traditional weak converse techniques involving mutual information inequalities
and Gallager-type explicit identification of auxiliary random variables. We
show that the new upper bound is strictly tighter than all previous bounds for
the Gaussian relay channel with non-zero channel gains. When specialized to the
relay channel with orthogonal receiver components, the bound resolves a
conjecture by Kim on a class of deterministic relay channels. When further
specialized to the class of product-form relay channels with orthogonal
receiver components, the bound resolves a generalized version of Cover's relay
channel problem, recovers the recent upper bound for the Gaussian case by Wu et
al., and improves upon the recent bounds for the binary symmetric case by Wu et
al. and Barnes et al., which were obtained using non-traditional geometric
proof techniques. For the special class of a relay channel with orthogonal
receiver components, we develop another upper bound on the capacity which
utilizes an auxiliary receiver and show that it is strictly tighter than the
bound by Tandon and Ulukus. Finally, we show through the Gaussian relay channel
with i.i.d. relay output sequence that the bound with the auxiliary receiver
can be strictly tighter than our main bound.

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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: nucl-th