To simultaneously mitigate the linear and nonlinear channel impairments in high-speed optical communications, we
propose the use of non-binary low-density-parity-check-coded modulation in combination with a coarse backpropagation
method. By employing backpropagation, we reduce the memory in the channel and in return obtain significant
reductions in the complexity of the channel equalizer which is exponentially proportional to the channel memory. We
then compensate for the remaining channel distortions using forward error correction based on non-binary LDPC codes.
We propose non-binary-LDPC-coded modulation scheme because, compared to bit-interleaved binary-LDPC-coded
modulation scheme employing turbo equalization, the proposed scheme lowers the computational complexity and
latency of the overall system while providing impressively larger coding gains.
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