Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 15, Pages 4909-4922Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3078172
Keywords
Decoding; Iterative decoding; Reliability; Adaptive optics; Table lookup; Forward error correction; Complexity theory; Bounded distance decoding; coded modulation; error and erasure decoding; forward error correction; hard-decision decoding; high-throughput fiber-optic communications; low-density parity-check codes; product codes; staircase codes
Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [757791]
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The paper introduces two new decoding algorithms for improving the performance of iBDD-CR on PCs and SCCs, utilizing error and erasure decoding of component codes for an additional decoding attempt. These algorithms only require the exchange of hard messages between component decoders, making them suitable for ultra high-throughput fiber-optic systems.
Product codes (PCs) and staircase codes (SCCs) are conventionally decoded based on bounded distance decoding (BDD) of the component codes and iterating between row and column decoders. The performance of iterative BDD (iBDD) can be improved using soft-aided (hybrid) algorithms. Among these, iBDD with combined reliability (iBDD-CR) has been recently proposed for PCs, yielding sizeable performance gains at the expense of a minor increase in complexity compared to iBDD. In this paper, we first extend iBDD-CR to SCCs. We then propose two novel decoding algorithms for PCs and SCCs which improve upon iBDD-CR. The new algorithms use an extra decoding attempt based on error and erasure decoding of the component codes. The proposed algorithms require only the exchange of hard messages between component decoders, making them an attractive solution for ultra high-throughput fiber-optic systems. Simulation results show that our algorithms based on two decoding attempts achieve gains of up to 0.88 dB for both PCs and SCCs. This corresponds to a 33% optical reach enhancement over iBDD with bit-interleaved coded modulation using 256 quadrature amplitude modulation.
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