List of files

ldpc_dB_test.m
ldpc_bf.m
ldpc_wbf.m
ldpc_iwbf.m
ga.mat
ha.mat

ldpc_dB_test.m -  to generate a text file for BER/SNR values.  Uses BPSK. Change max values to shorted simulation time
ldpc_bf.m - BF algorithm
ldpc_wbf.m - WBF algorithm
ldpc_iwbf.m - IWBF algorithm
ga.mat - 200,52 Generator matrix, taken from http://www.kozintsev.net/soft/ldpc_distr.zip
ha.mat - 200,150 LDPC Matrix, sparse format, taken from http://www.kozintsev.net/soft/ldpc_distr.zip

NOTE:  
Codes were created using R2006a
Some files needs the Communication Toolbox to run.
Before running the code you may want to change the following in ldpc_dB_test.m.
	max_block - number of message blocks to transmit.  Affects simulation length/time.
	alp - optimum value for IWBF, varies on SNR and (N,K).
	
1. Load ga, ha. eg load ga
2. Convert ha to full matrix.  eg. Hs=full(ha)
3. Run ldpc_dB_test file eg. ldpc_dB_test(Ga,Hs,100,7,0.5);
	Generates a text file for SNR performance from 0-7dB at 0.5 intervals.
4. Wait for the simulation to complete.
5. Open file ...BF_study_results.txt.  Use Matlab/Wordpad to open as text.


Some other sites to visit for LPDC codes
http://www.inference.phy.cam.ac.uk/mackay/ - a master of LDPC, he started the LDPC fad in the 90s
http://www.kozintsev.net/soft.html -  contains Matlab programs for LDPC
http://arun-10.tripod.com/ldpc/ldpc.htm - a quick tutorial on LDPC with programs and explanations.



For questions, suggestions and corrections regarding this program, email me at jgavan101@yahoo.com
LDPC Programs Release 1, June 13, 2007