GENERATION OF SPATIALLY-COUPLED QUASI-CYCLIC LDPC CODES

摘要

The invention relates to an apparatus (100) for providing at least one parity check matrix defining a spatially-coupled low density parity check, LDPC, code on the basis of a set of base matrix parameters defining a plurality of base matrices, each base matrix of the plurality of base matrices being associated with a protograph of a plurality of protographs, wherein the set of base matrix parameters defines the size WxC, a circulant size N, a maximal column weight M and a set of allowed column weights of the plurality of base matrices, wherein the apparatus (100) comprises: a processor (101) configured to: generate on the basis of the plurality of protographs a set of candidate protographs by discarding protographs of the plurality of protographs; lift the protographs of the set of candidate protographs for generating a plurality of codes; and generate on the basis of a plurality of codes a set of candidate codes by discarding codes of the plurality of codes, wherein the processor (101) is configured to lift the protographs of the set of candidate protographs on the basis of a simulated annealing technique.