IMPLEMENTATION-ORIENTED METHOD OF BICM BASED ON LDPC CHECK MATRIX

摘要

An IMPLEMENTATION-ORIENTED METHOD of Bit Interleaved Coded Modulation (BICM) based on a Low-Density Parity-Check (LDPC) check matrix including constructing an LDPC code having a block check matrix or providing an existing LDPC, where the block check matrix is divided into one or more sub-matrixes H_ij with the size being B*B, constructing a BICM structure; in the BICM structure mapping an i^th bit sequence [bitps(i,0), . . . , bitps(i,m−1)] with a length being m to obtain a mapping symbol s(i), where the size of a set of the mapping symbols s(i) is 2^m; enabling mapping bits of all the mapping symbols s(i) of a mapping symbol subset S, =[s,(0), . . . s(i), . . . s(B−1)] to correspond to m check sub-matrixes. The mapping bits at the same position correspond to the same check sub-matrix, the number of which is m. Subsequently a receiver reads bit external information blocks corresponding to the mapping symbols during parallel soft demodulation, thereby implementing decoding feedback and fully exerting a joint receiving performance.