Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive Delay-Tolerant Distributed Space-Time Coding Based on
  Adjustable Code Matrices for Cooperative MIMO Relaying Systems   An adaptive delay-tolerant distributed space-time coding (DSTC) scheme that
exploits feedback is proposed for two-hop cooperative MIMO networks. Maximum
likelihood (ML) receivers and adjustable code matrices are considered subject
to a power constraint with a decode-and-forward (DF) cooperation strategy. In
the proposed delay-tolerant DSTC scheme, an adjustable code matrix is employed
to transform the space-time coded matrix at the relay nodes. Least-squares (LS)
algorithms are developed with reduced computational complexity to adjust the
parameters of the codes. Simulation results show that the proposed algorithms
obtain significant performance gains and address the delay issue for
cooperative MIMO systems as compared to existing delay-tolerant DSTC schemes.

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The categories of this paper are: astro-ph
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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: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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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: alg-geom