Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polar Decomposition of Mutual Information over Complex-Valued Channels   A polar decomposition of mutual information between a complex-valued
channel's input and output is proposed for a input whose amplitude and phase
are independent of each other. The mutual information is symmetrically
decomposed into three terms: an amplitude term, a phase term, and a cross term,
whereby the cross term is negligible at high signal-to-noise ratio. Theoretical
bounds of the amplitude and phase terms are derived for additive white Gaussian
noise channels with Gaussian inputs. This decomposition is then applied to the
recently proposed amplitude phase shift keying with product constellation
(product-APSK) inputs. It shows from an information theoretical perspective
that coded modulation schemes using product-APSK are able to outperform those
using conventional quadrature amplitude modulation (QAM), meanwhile maintain a
low complexity.

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The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics