Improving soft FEC performance for higher-order modulations via optimized bit channel mappings
Artikel i vetenskaplig tidskrift, 2014

Soft forward error correction with higher-order modulations is often implemented in practice via the pragmatic bit-interleaved coded modulation paradigm, where a single binary code is mapped to a nonbinary modulation. In this paper, we study the optimization of the mapping of the coded bits to the modulation bits for a polarization-multiplexed fiber-optical system without optical inline dispersion compensation. Our focus is on protograph-based low-density parity-check (LDPC) codes which allow for an efficient hardware implementation, suitable for high-speed optical communications. The optimization is applied to the AR4JA protograph family, and further extended to protograph-based spatially coupled LDPC codes assuming a windowed decoder. Full field simulations via the split-step Fourier method are used to verify the analysis. The results show performance gains of up to 0.25 dB, which translate into a possible extension of the transmission reach by roughly up to 8%, without significantly increasing the system complexity.

optimization

coded modulation

interleaver

BICM

Bit mapper

spatially coupled

mapping

higher-order modulations

LDPC code

Författare

Christian Häger

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Alexandre Graell i Amat

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Fredrik Brännström

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Alex Alvarado

University College London (UCL)

Erik Agrell

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Optics Express

1094-4087 (ISSN)

Vol. 22 12 14544-14558

Komprimerad avkänning med hjälp av kodningsteori

Vetenskapsrådet (VR), 2012-01-01 -- 2015-12-31.

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Telekommunikation

Kommunikationssystem

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1364/OE.22.014544

Mer information

Senast uppdaterat

2018-03-29