Girth-eight column-weight four QC-LDPC codes

constructs girth-eight column-weight four LDPC codes

Description

The algorith divides rows in to four equal groups. The rows are then used to from a distance graph which is then transformed into a matrix. girth of eight is maintained by avoiding six-cycles in the graph construction.

• MATLAB release: MATLAB 7.0.1 (R14SP1)

[Urs (us) Schwarz]

after running this script, the user ends up with 55 meaningless variables (total size: 4650720 bytes) in his/her workspace... no what?
us

[Yang Xiao]

1. You program can not ensure the obtained H to be nonsingular;
2. If we get the H to be nonsingular from your program, in my test, the minimum weight of the (8,4) codes is good.
3. Your published column weight 2 LDPC codes of girth 12 have many low weight codes, to be useless and mislead readers.