Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Interference-Free Filter-Bank Multicarrier System Applicable for MIMO
  Channels   In filter-bank multicarrier (FBMC) systems the intrinsic interference is the
major challenge to achieve a full gain of diversity over multi-input
multi-output (MIMO) channels. In this paper, we develop a novel multicarrier
system called FBMC offset upper-lower polyphase network (FBMC/OULP) in which,
to eliminate the intrinsic interference, the complex-valued symbols are
alternatively transmitted via upper and lower half of polyphase network
branches with an offset time. The symbol density of the FBMC/OULP system is
equal to one complex-valued symbol in time-frequency lattice. Also, for
transmission over frequency selective channels, a minimum mean square error
(MMSE) estimator is employed at the receiver of the FBMC/OULP system to
eliminate the interference caused by the frequency selectivity of the channel.
The proposed scheme mitigates the produced interference between symbols in the
upper and lower polyphase branches, based on the circular convolutional
property. As a result of using complex-valued symbols and diminishing the
interference, the full diversity gain of the orthogonal space-time block codes
(OSTBC) can be achieved in MIMO channels by a low complex maximum likelihood
(ML) detector. In comparison with the orthogonal frequency division
multiplexing (OFDM) system, simulation results indicate that the proposed
system achieves a superior performance in fast multi-path fading channels and a
competitive performance in slow multi-path fading channels.

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The categories of this paper are: physics
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The categories of this paper are: stat
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex