Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-Pair Two-Way Massive MIMO DF Relaying Over Rician Fading Channels
  Under Imperfect CSI   We investigate a multi-pair two-way decode-andforward relaying aided massive
multiple-input multiple-output antenna system under Rician fading channels, in
which multiple pairs of users exchange information through a relay station
having multiple antennas. Imperfect channel state information is considered in
the context of maximum-ratio processing. Closedform expressions are derived for
approximating the sum spectral efficiency (SE) of the system. Moreover, we
obtain the powerscaling laws at the users and the relay station to satisfy a
certain SE requirement in three typical scenarios. Finally, simulations
validate the accuracy of the derived results.

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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
4
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: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg