Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precoder Index Modulation   Index modulation, where information bits are conveyed through antenna indices
(spatial modulation) and subcarrier indices (subcarrier index modulation) in
addition to information bits conveyed through conventional modulation symbols,
is getting increased research attention. In this paper, we introduce {\em
precoder index modulation}, where information bits are conveyed through the
choice of a precoder matrix at the transmitter from a set of pre-determined
pseudo-random phase precoder (PRPP) matrices. Combining precoder index
modulation (PIM) and spatial modulation (SM), we introduce a PIM-SM scheme
which conveys information bits through both antenna index as well as precoder
index. Spectral efficiency (in bits per channel use) and bit error performance
of these index modulation schemes are presented.

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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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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: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-alg