Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Iterative Detection and Decoding of Finite-Length Polar Codes in
  Gaussian Multiple Access Channels   We consider the usage of finite-length polar codes for the Gaussian multiple
access channel (GMAC) with a finite number of users. Based on the
interleave-division multipleaccess (IDMA) concept, we implement an iterative
detection and decoding non-orthogonal multiple access (NOMA) receiver that
benefits from a low complexity, while scaling (almost) linearly with the amount
of active users. We further show the conceptual simplicity of the belief
propagation (BP)-based decoder in a step-by-step illustration of its
construction. Beyond its conceptual simplicity, this approach benefits from an
improved performance when compared to some recent work tackling the same
problem, namely the setup of finite-length forward errorcorrection (FEC) codes
for finite-number of users. We consider the 5th generation mobile communication
(5G) polar code with a block length $N = 512$ applied to both a two-user and a
four-user GMAC scenario with a sum-rate of $R_{sum} = 0.5$ and $R_{sum} = 1$,
respectively. Simulation results show that a BP-based soft interference
cancellation (SoIC) receiver outperforms a joint successive cancellation (JSC)
scheme. Finally, we investigate the effect of a concatenated repetition code
which suggests that alternative polar code design rules are required in
multi-user scenarios.

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The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ