FPGA-based rate-adaptive LDPC-coded modulation for the next generation of optical communication systems

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22 Scopus citations

Abstract

In this paper, we propose a rate-adaptive FEC scheme based on LDPC codes together with its software reconfigurable unified FPGA architecture. By FPGA emulation, we demonstrate that the proposed class of rate-adaptive LDPC codes based on shortening with an overhead from 25% to 42.9% provides a coding gain ranging from 13.08 dB to 14.28 dB at a post-FEC BER of 10-15 for BPSK transmission. In addition, the proposed rate-adaptive LDPC coding combined with higher-order modulations have been demonstrated including QPSK, 8-QAM, 16-QAM, 32-QAM, and 64-QAM, which covers a wide range of signal-to-noise ratios. Furthermore, we apply the unequal error protection by employing different LDPC codes on different bits in 16-QAM and 64-QAM, which results in additional 0.5dB gain compared to conventional LDPC coded modulation with the same code rate of corresponding LDPC code.

Original languageEnglish (US)
Pages (from-to)21159-21166
Number of pages8
JournalOptics Express
Volume24
Issue number18
DOIs
StatePublished - Sep 5 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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