Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive Delay-Tolerant DSTBC in Opportunistic Relaying Cooperative MIMO
  Systems   An adaptive delay-tolerant distributed space-time coding (DSTC) scheme with
feedback is proposed for two-hop cooperative multiple-input multiple-output
(MIMO) networks using an amplify-and-forward strategy and opportunistic
relaying algorithms. Maximum likelihood receivers and adjustable code matrices
are considered subject to a power constraint. In the proposed delay-tolerant
DSTC scheme, an adjustable code matrix is employed to transform the space-time
coded matrices at the relay nodes. Stochastic gradient algorithms are developed
with reduced computational complexity to estimate the parameters of the code
matrix. Simulation results show that the proposed algorithms obtain significant
performance gains and address the delay issue in cooperative MIMO systems as
compared to existing DSTC schemes.

9
The categories of this paper are: nlin
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics