Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple-Input Multiple-Output OFDM with Index Modulation   Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is
a novel multicarrier transmission technique which has been proposed as an
alternative to classical OFDM. The main idea of OFDM-IM is the use of the
indices of the active subcarriers in an OFDM system as an additional source of
information. In this work, we propose multiple-input multiple-output OFDM-IM
(MIMO-OFDM-IM) scheme by combining OFDM-IM and MIMO transmission techniques.
The low complexity transceiver structure of the MIMO-OFDM-IM scheme is
developed and it is shown via computer simulations that the proposed
MIMO-OFDM-IM scheme achieves significantly better error performance than
classical MIMO-OFDM for several different system configurations.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
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The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con