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We demonstrate detection of a superchannel with net bit rate in excess of 1 Tb/s with a single coherent receiver. Novel, pilot-aided equalization and carrier recovery algorithms enable detection of an 11 × 10 GBd DP-64QAM Nyquist superchannel (1.32 Tb/s gross bit rate).
We propose a modified log-likelihood ratio (LLR) calculation for an LDPC decoder to be robust against residual phase noise at the demodulator. The proposed scheme is based on a linear/bilinear transform offers 1 ∼ 2dB gain in the presence of large phase noise.
We propose a dynamic window decoding scheme for LDPC convolutional codes to reduce the latency compared to the belief propagation decoding. The BER performance of our proposed memory-efficient decoding scheme is verified by simulations.
We show how to design capacity-approaching LDPC codes under different modulation formats and different decoding methods. With EXIT chart analysis for finite-iteration BICM-ID of various HDM, we achieve 2dB gain from a code optimized for 1D modulation.
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