Patent Document ID: 9722633
Application ID: 14619392
Patent Flag: 1

Claim One:
1. A method for adaptive modulation and coding (AMC) in a communications network, comprising steps: coding and decoding data using a set of codes having variable rate and multiple variable parity-check matrices (PCMs); and modulating and demodulating the data using a set of modulation formats having variable order and variable dimension, wherein the coding and the modulating are performed in a transmitter and the demodulating and the decoding are performed in a receiver, wherein the decoding uses a set of low-density parity-check (LDPC) codes having variable rate and variable PCM, wherein multiple PCMs have different degree distributions to achieve a minimum required SNR designed for different modulation parameters, different receiver parameters, and different coding parameters, wherein designing the multiple PCMs comprises steps; adjusting a degree distribution for variable nodes and check nodes in a bipartite graph for a given combination of the coding parameters, the modulation parameters, and the receiver parameters; adjusting a girth according to the adjusted degree distribution; and adapting the PCM to refine for different combinations of the modulation parameters and the receiver parameters, wherein adjusting the degree distribution comprises steps; setting up the degree distribution with average and maximum degree constraints; modifying a bit labeling for a high-order and high-dimensional modulation; analyzing mutual information updates across decoding iterations given the degree distribution by using an extrinsic information transfer (EXIT) trajectory analysis; searching for a required SNR achieving the mutual information of one by using a line search algorithm; iterating from the setting to the searching steps using heuristic optimization methods until a maximum iteration of optimizations reaches a pre-defined number; and outputting the degree distribution and the required SNR.