LDPC-coded modulation for ultra-high-speed optical transport in the presence of phase noise

摘要

Methods and systems for decoding a signal include compensating for impairments in a received signal using at least carrier phase estimation, where residual phase error remains after compensation; calculating symbol log-likelihood ratios (LLRs) for symbols in the compensated signal using Monte Carlo integration; demapping the symbols in the compensated signal using the symbol LLRs and extrinsic information from signal decoding to produce one or more estimated codewords; and decoding each estimated codeword with a decoder that generates a decoded codeword and extrinsic information.

主权项

1. A method for decoding a signal, comprising:
receiving the signal using an optical detector; using a processor, compensating for impairments in the signal using at least carrier phase estimation, wherein residual phase error remains after said compensation; using the processor, calculating symbol log-likelihood ratios (LLRs) for symbols in the compensated signal using Monte Carlo integration; using the processor, demapping the symbols in the compensated signal using the symbol LLRs and extrinsic information from signal decoding to produce one or more estimated codewords; and using the processor, decoding each estimated codeword with a decoder that generates a decoded codeword and the extrinsic information.