Pilot-Aided Log-Likelihood Ratio for LDPC Coded MPSK-OFDM Transmission

The pilot-aided log-likelihood ratio (LLR) is derived from low-density parity-check coded coherent optical M-ary phase-shift keying orthogonal frequency division multiplexing transmission system with laser phase noise. Approximations of the metrics, which yield lower computational cost and comparable performance, are also introduced. The bit error ratio performance is tested through simulation for the proposed LLR metrics.

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