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On LLR Calculations for Soft-decision Decoding in Next-generation IM-DD Systems with Laser RIN
Abstract
We propose a low-complexity LLR approximation for SD decoding in IM-DD systems with relative intensity noise. Our approximation results in no BER performance penalty for a concatenated KP4+Hamming FEC scheme, and outperforms mismatched AWGN-based LLRs.
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