Generating a Regular LDPC Code Teaching-Research Matrix with Optimized Parameters

Generate a regular LDPC code teaching-research matrix H with rows (preferably larger) equal to half the number of columns, row weight of 6, column weight of 3, and ensuring no cycles of girth 4 between any two rows. Implementation method: H = HGrandom2(m, n), where m represents the number of rows and n represents the number of columns. The algorithm employs a random construction approach while maintaining structural constraints through girth checking mechanisms.