Shortten DVB-S2 LDPC 64800 code into 8100

The program can produce the parity check matrix of DVB-S2 LDPC 64800 with short length code of 8100.

The program can produce the parity check matrix of DVB-S2 LDPC with the size 8100*4050, and 1/2 code rate.
Copyright (C) Yang XIAO, Beijing Jiaotong University, June 22, 2010, E-Mail: [e-mail].
Current Version Published: 2010-6-22
In our following papers [1,2], we find that the shortten codes of DVB-S2 LDPC have some problems. This program can provide a shortten code from DVB-S2 LDPC.
This program is to shorten DVB-S2 LDPC 1/2 rate 64800 code into 1/2 rate 8100 code without Girth 4 by using the parity check matrix program as follows:
http://www.mathworks.com/matlabcentral/fileexchange/27265-parity-check-matrices-of-dvbs2-codes
References:
[1] Yang Xiao, Kiseon Kim, "Alternative good LDPC codes for DVB-S2", 9th International Conference on Signal Processing, 2008 (ICSP 2008), Beijing, 26-29 Oct. 2008, page(s): 1959-1962.
[2] Huang, Xi; Fan, Jun; Xiao, Yang; Kim, Kiseon; Girth 4 and Low Minimum Weights' Problems of LDPC Codes in DVB-S2
and Solutions, 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09.
24-26 Sept. 2009 Page(s):1–4.
The papers can be downloaded from Web site of IEEE Explore.