Patent ID: 8184993
Filing Date: 2012-05-22
Classification: H03M,H04B,H04L

Abstract:
1. A receiver, comprising: a detector configured to receive polarization multiplexed coded orthogonal frequency division multiplexing (OFDM) input sequences and generate estimates of unknown transmitted symbols in the input sequences for x- and y-polarization channels with respect to laser phase noise and PMD; a demapper coupled to said detector, configured to partially cancel polarization mode dispersion (PMD) in the input sequences by computing symbol probabilities for the estimates with respect to the laser phase noise, and averaging the symbol probabilities with respect to the laser phase noise; and one or more low-density parity-check (LDPC) decoders coupled to said demapper, configured to receive bit probabilities derived from the averaged symbol probabilities and output code words based at least on the bit probabilities, the one or more LDPC decoders iteratively providing extrinsic soft information feedback to said demapper to compensate for the PMD.