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30 Mar 2009 Alternative good LDPC codes for DVB-S2 The program can produce the parity check matrix of DVB-S2 with the size 5400*2700. Author: Yang Xiao Xiao, Yang

In our recent research for LDPC code design, we found that the bidiagnal matrix in parity check matrix will degrade the BER of the desired codes, including shortten DVB-S2 codes. The main reason is the bidiagnal matrix leads lower weight codes in code set. Our this disclosed program provides a spetial case that can avoid the problem. However, we revised the original code design of DVB-S2. From the BER of our codes, we can see that it is unnecessary for casecaded BCH codes for DVB-S2 channel coding, which makes the implementation of DVB-S2 channel coding to be complex and high cost.
29 Sep 2008 Girth 4 test for LDPC codes We need to know that Girth 4 of H will lead to a poor BER performance. The program can test whether Author: Yang Xiao anggraeni, silvia

Thank you very much ....
29 Sep 2008 Girth 4 of Gallager codes The program shows the girth 4 of Gallager codes Author: Yang Xiao anggraeni, silvia

Thank you for giving the simple m-file to test girth 4 cycle. It is very useful for me and my program .....

 
29 Sep 2008 Count the number of the girth 4 of LDPC codes The program can count the number of the girth 4 of LDPC codes. Author: Yang Xiao anggraeni, silvia

Thank you for sharing this m-file ...
29 Sep 2008 Construct the short length of QC LDPC codes without girth 4 and girth 6 The program constructs the short length of QC LDPC codes without girth 4 and girth 6 Author: Yang Xiao anggraeni, silvia

It is a very good example of LDPC codes without girth 4.Thank you for sharing the code ...
15 Jul 2008 Girth 4 of Gallager codes The program shows the girth 4 of Gallager codes Author: Yang Xiao Xiao, Yang

Reply to Mr. Arash Saber:

My program is only to show that the published Gallager codes have girth 4, the problem is ignored by many LDPC learners.

From your comment, I suppose, you may not know the girth 4 problem of LDPC codes.

10 Jul 2008 Construct the short length of QC LDPC codes without girth 4 and girth 6 The program constructs the short length of QC LDPC codes without girth 4 and girth 6 Author: Yang Xiao Sewan, Sabah

Thnx alot
24 May 2008 Girth 4 of Gallager codes The program shows the girth 4 of Gallager codes Author: Yang Xiao Saber, Arash

Is this your first time writing a program?
16 May 2008 Construct the short length of QC LDPC codes without girth 4 and girth 6 The program constructs the short length of QC LDPC codes without girth 4 and girth 6 Author: Yang Xiao sss, sss

08 May 2008 Count the number of the girth 4 of LDPC codes The program can count the number of the girth 4 of LDPC codes. Author: Yang Xiao Malema, Konbaar

bad performance file
19 Feb 2008 inverse 2-D Laplace-z transform The program can get spatial-time response of 2-D Continuous-Discrete systems by taking inverse 2-D L Author: Yang Xiao Ilham, Resha

10 Aug 2007 Count the number of the girth 4 of LDPC codes The program can count the number of the girth 4 of LDPC codes. Author: Yang Xiao Danh Khoa, nguyen

08 Aug 2007 Hurwitz-Schur Stability Test of 2-D Polynomials This program can test the Hurwitz-Schur Stability of 2-D Polynomials. Author: Yang Xiao OZGUL, Ali

Dear Yang Xiao

I perused your Hurwitz-Schur stability test with matlab program algorithm and run-times.

[1]. If you use the matlab-vector application instead of for-next(end) procedure than it is more speedly.
For example:

M=512;
n=1:512;
z=exp(j.*2.*pi.*(n-1)/M);

[2] If you make this m-file, one matlab sub-function than be very usefully for users.

Good works, best regards
06 Aug 2007 Girth 4 test for LDPC codes We need to know that Girth 4 of H will lead to a poor BER performance. The program can test whether Author: Yang Xiao Lu, xk

Very Good!Thank you!
03 Aug 2007 Stability Test of 2-D Face of an Interval Matrix The program can test the stability of 2-D face of an interval matrix. Author: Yang Xiao tlig, lotfi

26 Jul 2007 Girth 4 of Gallager codes The program shows the girth 4 of Gallager codes Author: Yang Xiao Roossien, B.

- Script file
- Contains the 'clear' command
- Useless data is not supressed by a semicolon
- No pre-allocation of growing arrays.
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