High order modulation protograph codes

摘要

Digital communication coding methods for designing protograph-based bit-interleaved code modulation that is general and applies to any modulation. The general coding framework can support not only multiple rates but also adaptive modulation. The method is a two stage lifting approach. In the first stage, an original protograph is lifted to a slightly larger intermediate protograph. The intermediate protograph is then lifted via a circulant matrix to the expected codeword length to form a protograph-based low-density parity-check code.

主权项

1. A digital communication coding method comprising:
selecting a first protograph having a first protograph structure; lifting the first protograph to a second protograph by a selected factor; and lifting the second protograph to a third protograph via a circulant matrix, wherein the third protograph provides a protograph code having a desired codeword length, and wherein the selected factor is m, and m is calculated by the equation as follows:
m=log2M where M is equal to the number of modulation symbols in a signal.