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Improving soft FEC ...
Improving soft FEC performance for higher-order modulations via optimized bit channel mappings
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- Häger, Christian, 1986 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Graell i Amat, Alexandre, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Brännström, Fredrik, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Alvarado, Alex, 1982 (author)
- University College London (UCL)
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- Agrell, Erik, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 22:12, s. 14544-14558
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Kommunikationssystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Communication Systems (hsv//eng)
Keyword
- optimization
- coded modulation
- interleaver
- BICM
- Bit mapper
- spatially coupled
- mapping
- higher-order modulations
- LDPC code
Publication and Content Type
- art (subject category)
- ref (subject category)
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