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- W2953384002 abstract "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 ARJ4A 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." @default.
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- W2953384002 date "2014-04-08" @default.
- W2953384002 modified "2023-09-27" @default.
- W2953384002 title "Improving Soft FEC Performance for Higher-Order Modulations by Bit Mapper Optimization" @default.
- W2953384002 hasPublicationYear "2014" @default.
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