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This paper proposes two new cycle-optimized algorithms, called the multi-step progressive edge-growth (PEG) algorithm and the multi-step approximate cycle extrinsic message degree (ACE) constrained PEG algorithm, to design an LDPC code with larger girth and better cycle-connectivity. In addition, an efficient method is developed to calculate the distances between the variable nodes (VNs) and the check...
We investigated the convergence speed of a modified frequency-domain least-mean-square algorithm in few-mode fiber transmission systems. This algorithm improves the convergence speed by about 30% with negligible increase in implementation complexity.
We simulated 8 400-Gbit/s PDM-QPSK over 2000-km transmission by using Map detection to reduce the channel spacing to 100-GHz. MAP detection can significantly improve the system performance to < 10−3 BER compared to non-MAP detection.
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