Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polar-Coded Non-Orthogonal Multiple Access   Non-orthogonal multiple access (NOMA) is one of the key techniques to address
the high spectral efficiency and massive connectivity requirements for the
fifth generation (5G) wireless system. To efficiently realize NOMA, we propose
a joint design framework combining the polar coding and the NOMA transmission,
which deeply mines the generalized polarization effect among the users. In this
polar coded NOMA (PC-NOMA) framework, the original NOMA channel is decomposed
into multiple bit polarized channels by using a three-stage channel transform,
that is, user$\to$signal$\to$bit partitions. Specifically, for the first-stage
channel transform, we design two schemes, namely sequential user partition
(SUP) and parallel user partition (PUP). For the SUP, a joint successive
cancellation detecting and decoding scheme is developed, and a search algorithm
is proposed to schedule the NOMA detecting order which improves the system
performance by enhanced polarization among the user synthesized channels. The
"worst-goes-first" idea is employed in the scheduling strategy, and its
theoretic performance is analyzed by using the polarization principle. For the
PUP, a corresponding parallel detecting scheme is exploited to reduce the
latency. The block error ratio performances over the additive white Gaussian
noise channel and the Rayleigh fading channel indicate that the proposed
PC-NOMA obviously outperforms the state-of-the-art turbo coded NOMA scheme due
to the advantages of joint design between the polar coding and NOMA.

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The categories of this paper are: physics
21
The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph