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

Patent metadata

Field	Value
Publication number	US-9036992-B2
Application number	US-201313903508-A
Country	US
Kind code	B2
Filing date	May 28, 2013
Priority date	Oct 9, 2012
Publication date	May 19, 2015
Grant date	May 19, 2015

Abstract

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.

First claim

What is claimed is:

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…

Assignees

• Nec Lab America Inc

Inventors

• Djordjevic Ivan B
• Wang Ting

Classifications

• H04B10/6165

  Electricity · mapped topic

• H04B10/616 Primary

  Electricity · mapped topic

• H04B10/2507 Primary

  Electricity · mapped topic