LDPC_codec.rar_DVB S2_LDPC DVB DECODER_LDPC dvb_coder LDPC_ldpc

List of files ldpc_encode.m ldpc_dB_test.m ldpc_bf.m ldpc_wbf.m ldpc_iwbf.m ga.mat ha.mat ldpc_encode.m - creates the LDPC coded message which will be sent to the channel. ldpc_dB_test.m - to generate a text file for BER/SNR values. Uses BPSK. Change max values to shorten simulation time ldpc_bf.m - BF algorithm ldpc_wbf.m - WBF algorithm ldpc_iwbf.m - IWBF algorithm ldpc_irrwbf.m - IRRWBF 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 Matlab 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 ...*results.txt. Use Matlab/Wordpad to open as text. File name format is mm-dd_hr-min_NxK_results.txt I changed it so that I will know when the simulation started and what the matrix size is. 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 [email protected] Release 1, June 13, 2007 Release 2, June 22, 2007 - Added IRRWBF algorithm, changed format of output filename