xdcesc / NB_LDPC_FB

c code for Non-Binary LDCP decoder

Welcome to the c code for NB-LDPC simulation

You can use this code to simulate NB-LDPC matrices using the Extented-Min Sum (EMS) algorithm. The Check Node (CN) is processed using Forward Backward(FB) algorithm. The FB algorithm splits CN in elementary CNs (ECN).

usage

input argument

there are 8 arguments

1. NbMonteCarlo     : # simulated frames
   

2. NbIterMax        : # of maximum decoding iteration
   

3. FileMatrix       : File name of the parity-check matrix
   

4. EbN              : Eb/No (dB)
   

5. n_vc             : size of truncated messages from Variable to Check
   

6. n_cv	            : size of truncated messages from Check to Variable
   

7. Offset           : offset correction factor (0.4 -- 1)
   

8. NbOper           : Maximum number of operations for sorting
   

output

Frame Error Rate (FER) and Bit Error Rate (BER) and average number of iterations for the given simulation parameters

input and output files

• Input File : 'FileMatrix' is an ASCII file with the parity-check matrix description in aList format.
• Output File : a txt file giving in the ./data forder giving SNR, BER, average number of iterations and time of the end of simulation

Simulation on windows

you may use CodeBlocks IDE

in the Projet-> Set Programs' arguments

2000 10 ./matrices/KN/N576_K480_GF64.txt 3.5 20 20 0.3 25

Simulation on Linux

compile the c code using the makefile

make

then run with appropriate parameters

./essai 2000 10 ./matrices/KN/N576_K480_GF64.txt 3.5 20 20 0.3 25

you may use the start.sh shell script to run simulation for multiple snr

sh ./start.sh

Simulation results

Monte-Carlo simulation of Non-Binary LDPC decoder

Simulation parameters:

     NbMonteCarlo     : 2000
     NbIterMax        : 10
     FileMatrix       : ./matrices/KN/N576_K480_GF64.txt
     Eb/No (dB)       : 3.5
     n_vc             : 20
     n_cv				: 20
     Offset           : 0.3
     NbOper           : 25

Normal alist format is used! LDPC code parameters: N :96 K :80 M :16 CR :0.833333 GF :64 logGF :6

     Note             : FB30

Simulation started at time: Wed Jan 08 17:34:02 2020

<0> FER= 40 / 751 = 0.053262 BER= 520 / x = 0.001443 avr_it=2.58 results are printed in file ./data/results_N96_CR0.83_GF64_IT10_Offset0.3_nm20_FB30.txt

results printed

Simulation complete at time: Wed Jan 08 17:34:08 2020