Adaptive Coded Modulation for Nonlinear Fiber-Optical Channels
Paper i proceeding, 2012

A low complexity hybrid polar low-density parity check (LDPC) coded modulation (CM) scheme is introduced for a single-wavelength fiber-optical channel. In the proposed scheme, we exploit a low complexity probabilistic shaping together with a four-dimensional (4D) mapping to reduce the complexity of a 4D non-binary LDPC CM scheme for fiber-optic channels. The proposed scheme has a flexible structure and it can be used as an adaptive-rate CM scheme. The numerical results show that the forward error correction (FEC) threshold of the introduced CM scheme can be significantly improved by probabilistic shaping with a negligible increase in the system complexity. In particular, the FEC threshold for the uncoded symbol error rate of the introduced CM scheme with 4D 16-ary quadrature amplitude modulation can be improved from 0.058 to 0.072 by exploiting a shaping overhead (redundancy) of 0.016 for an information bit error rate of 10^{-5}.

and FEC threshold

Coded modulation

Chromatic dispersion

polar code

probabilistic shaping

adaptive coded modulation

low density parity check code (LDPC)

fiber-optic channel

nonlinear Kerr-effect


Lotfollah Beygi

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

Erik Agrell

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

Magnus Karlsson

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

2012 IEEE Globecom Workshops, Anaheim, USA, 3-7 December 2012

331-335 6477592
978-1-4673-4942-0 (ISBN)


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