9,738 research outputs found
Throughput-based Design for Polar Coded-Modulation
Typically, forward error correction (FEC) codes are designed based on the
minimization of the error rate for a given code rate. However, for applications
that incorporate hybrid automatic repeat request (HARQ) protocol and adaptive
modulation and coding, the throughput is a more important performance metric
than the error rate. Polar codes, a new class of FEC codes with simple rate
matching, can be optimized efficiently for maximization of the throughput. In
this paper, we aim to design HARQ schemes using multilevel polar
coded-modulation (MLPCM). Thus, we first develop a method to determine a
set-partitioning based bit-to-symbol mapping for high order QAM constellations.
We simplify the LLR estimation of set-partitioned QAM constellations for a
multistage decoder, and we introduce a set of algorithms to design
throughput-maximizing MLPCM for the successive cancellation decoding (SCD).
These codes are specifically useful for non-combining (NC) and Chase-combining
(CC) HARQ protocols. Furthermore, since optimized codes for SCD are not optimal
for SC list decoders (SCLD), we propose a rate matching algorithm to find the
best rate for SCLD while using the polar codes optimized for SCD. The resulting
codes provide throughput close to the capacity with low decoding complexity
when used with NC or CC HARQ
Performance Analysis of a 5G Transceiver Implementation for Remote Areas Scenarios
The fifth generation of mobile communication networks will support a large
set of new services and applications. One important use case is the remote area
coverage for broadband Internet access. This use case ha significant social and
economic impact, since a considerable percentage of the global population
living in low populated area does not have Internet access and the
communication infrastructure in rural areas can be used to improve agribusiness
productivity. The aim of this paper is to analyze the performance of a 5G for
Remote Areas transceiver, implemented on field programmable gate array based
hardware for real-time processing. This transceiver employs the latest digital
communication techniques, such as generalized frequency division multiplexing
waveform combined with 2 by 2 multiple-input multiple-output diversity scheme
and polar channel coding. The performance of the prototype is evaluated
regarding its out-of-band emissions and bit error rate under AWGN channel.Comment: Presented in 2018 European Conference on Networks and Communications
(EuCNC),18-21 June, 2018, Ljubljana, Sloveni
A Novel Interleaving Scheme for Polar Codes
It's known that the bit errors of polar codes with successive cancellation
(SC) decoding are coupled. We call the coupled information bits the correlated
bits. In this paper, concatenation schemes are studied for polar codes (as
inner codes) and LDPC codes (as outer codes). In a conventional concatenation
scheme, to achieve a better BER performance, one can divide all bits in a
LDPC block into polar blocks to completely de-correlate the possible
coupled errors. In this paper, we propose a novel interleaving scheme between a
LDPC code and a polar code which breaks the correlation of the errors among the
correlated bits. This interleaving scheme still keeps the simple SC decoding of
polar codes while achieves a comparable BER performance at a much smaller delay
compared with a -block delay scheme
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