Multistage Bit-Wise Receivers for 4D Modulation Formats in Optical Communications
Conference: SCC 2015 - 10th International ITG Conference on Systems, Communications and Coding
02/02/2015 - 02/05/2015 at Hamburg, Germany
Proceedings: SCC 2015
Pages: 6Language: englishTyp: PDF
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Authors:
Waeckerle, Florian; Fischer, Robert F. H. (Institut für Nachrichtentechnik, Universität Ulm, Ulm, Germany)
Abstract:
Over the last years, coded modulation (CM) schemes for coherent fiber-optic communications have gained huge interest in research motivated by the application of four-dimensional (4D) higher-order modulation formats. One possible candidate is the bit-interleaved coded modulation (BICM) paradigm, which however will cause a rate loss compared to the optimum multilevel coding (MLC) approach if no Gray labeling is possible. In this paper, a multistage bit-wise CM scheme to close the rate gap between MLC and BICM is presented. Numerical results for relevant 4D signal sets are provided.