Rate adaptive irregular QC-LDPC codes from pairwise balanced designs for ultra-high-speed optical transports

摘要

Systems and methods for data transport include encoding one or more streams of input data using one or more Quasi-Cyclic Low Density Parity Check (QC-LDPC) encoders; controlling irregularity of the QC-LDPC encoded data while preserving the quasi-cyclic nature of the LDPC encoded data and eliminating the error floor phenomenon. A parity-check matrix may be partially reconfigured to adapt one or more code rates; and one or more signals are generated using a mapper, wherein the output of the mapper is modulated onto a transmission medium. One or more streams of input data are received, and the streams are decoded using one or more QC-LDPC decoders.

主权项

1. A method for data transport, comprising:
within a transmitter:
encoding one or more streams of input data using one or more Quasi-Cyclic Low Density Parity Check (QC-LDPC) encoders;controlling irregularity of the QC-LDPC encoded data with a set of points having size v and one or more blocks being a subset of the set of points;determining a pairwise balanced designed (PBD) (v, K, λ) as a collection of blocks of different sizes taken from a set of points K such that every pair of points is contained in λ of the blocks;partially reconfiguring a parity check matrix to adapt one or more code rates for partial reconfiguration of one or more of a first group of QC-LDPC decoders based on the above-parity-check matrix of irregular QC-LDPC codes based on PBDs by changing a size of the permutation matrix P or varying the number of employed block-rows, while keeping code word length fixed to generate one or more mapped signals;modulating the one or more mapped signals and sending the one or more modulated signals onto a transmission medium; and within a receiver:
decoding, by one or more of a second group of QC-LDPC decoders the one or more modulated signals from the transmission medium.