Rank: 1533 based on 39 downloads (last 30 days) and 12 files submitted
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Gabofetswe Malema

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Dr. G.A Malema
Lecturer, Departemnt of Computer Science,Univeristy of Botswana.

Professional Interests:
signal processing and processor architectures

 

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Files Posted by Gabofetswe View all
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12 Dec 2011 Construction of QC-LDPC Codes Program constructs qc-ldpc codes given size of sub-matrix, girth, row and columns weights. Author: Gabofetswe Malema qcldpc codes, girth 12 0
15 Nov 2010 Flexible Construction of Girth-10 Type II QC-LDPC Codes The program searches for a girth 10 Type II QC-LDPC code given sub-matrix size, row,column,weights Author: Gabofetswe Malema qcldpc codes, girth 10, type ii qcldpc codes 3 0
12 Nov 2010 Felxible Construction of Girth 12 QC-LDPC Codes The program searches for a girth-12 QC-LDPC Code give sub-matrix size and row/column weights. Author: Gabofetswe Malema qcldpc codes, girth 12 3 0
01 Nov 2010 Construction of Girth-6 Type III QC-LDPC Codes The program constructs girth-6 type III qc-ldpc codes given base matrix and sub-matrix size. Author: Gabofetswe Malema qcldpc codes, type iii, girth 6 3 0
29 Oct 2010 Construction of Girth-8 Type II QC-LPDC Codes The program constructs girth-8 type II qc-ldpc codes given Base matrix, size of sub-matrix. Author: Gabofetswe Malema qcldpc codes, type ii, girth 8 1 0
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30 Jul 2009 Flexible construction of girth-six QC-LDPC Codes constructs girth-six QC-LDPC codes given a row-weight,column-weight, sub-matrix size. Author: Gabofetswe Malema

I have BER and FER simulations for the (456,4,8) code (i.e m=57). The performance is okay and comparable to other (4,8) codes.
thank you.
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30 Jul 2009 Flexible construction of girth-six QC-LDPC Codes constructs girth-six QC-LDPC codes given a row-weight,column-weight, sub-matrix size. Author: Gabofetswe Malema Malema, Gabofetswe

I have BER and FER simulations for the (456,4,8) code (i.e m=57). The performance is okay and comparable to other (4,8) codes.
thank you.
20 Apr 2009 Flexible construction of girth-six QC-LDPC Codes constructs girth-six QC-LDPC codes given a row-weight,column-weight, sub-matrix size. Author: Gabofetswe Malema Xiao, Yang

Please check the BER of your codes: when j=4, k=8, m=57, the BER is very poor though it has no girth-4. Why?
10 Mar 2009 Girth-twelve column-weight two QC-LDPC codes contructs girth-twelve column-weight two qc-LDPC codes Author: Gabofetswe Malema ‹Š, ye

Reply to Mr. Wilson Grey
you said
if H(M*N) can be splitted into two parts
{H1}
----
{H2}
H1 has full rank. H2 can be expressed by some rows of H1.
Then one can get G from H1. so C*transpose(H1)=0, C(1*N) is any code word generated by G. Because H2 can be expressed by some rows of H1. So C*transpose(H2)=0.
So any codeword C*H=0
can this algorithm solve the problem which the parity check H is singular
since H1 is nonsingular why not use H1 instead of H
15 Jul 2008 Girth-eight column-weight four QC-LDPC codes constructs girth-eight column-weight four LDPC codes Author: Gabofetswe Malema Xiao, Yang

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.
11 Jul 2008 Girth-eight column-weight four QC-LDPC codes constructs girth-eight column-weight four LDPC codes Author: Gabofetswe Malema (us) Schwarz, Urs

after running this script, the user ends up with 55 meaningless variables (total size: 4650720 bytes) in his/her workspace... no what?
us
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qcldpc codes, information theory, coding theory, girth, communications
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
12 Dec 2011 Construction of QC-LDPC Codes Program constructs qc-ldpc codes given size of sub-matrix, girth, row and columns weights. Author: Gabofetswe Malema qcldpc codes, girth 12 0
15 Nov 2010 Flexible Construction of Girth-10 Type II QC-LDPC Codes The program searches for a girth 10 Type II QC-LDPC code given sub-matrix size, row,column,weights Author: Gabofetswe Malema qcldpc codes, girth 10, type ii qcldpc codes 3 0
12 Nov 2010 Felxible Construction of Girth 12 QC-LDPC Codes The program searches for a girth-12 QC-LDPC Code give sub-matrix size and row/column weights. Author: Gabofetswe Malema qcldpc codes, girth 12 3 0
01 Nov 2010 Construction of Girth-6 Type III QC-LDPC Codes The program constructs girth-6 type III qc-ldpc codes given base matrix and sub-matrix size. Author: Gabofetswe Malema qcldpc codes, type iii, girth 6 3 0
29 Oct 2010 Construction of Girth-8 Type II QC-LPDC Codes The program constructs girth-8 type II qc-ldpc codes given Base matrix, size of sub-matrix. Author: Gabofetswe Malema qcldpc codes, type ii, girth 8 1 0

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