public void FillGeneratingMatrix(int[,] G, int[,] H, CodeWord c, Matrix control)
{
int[,] tmp = new int[c.inputCodeWord.Count, control.rows];
for (int i = 0; i < c.inputCodeWord.Count; i++)
{
for (int j = 0; j < control.rows; j++)
{
tmp[i, j] = H[j, i];
}
}
for (int i = 0; i < this.rows; i++)
{
for (int j = 0; j < this.columns; j++)
{
if (j < this.rows)
{
if (i == j)
{
G[i, j] = 1;
}
else
{
G[i, j] = 0;
}
}
else
{
G[i, j] = tmp[i, j - this.rows];
}
}
}
}
static void Main(string[] args)
{
//Create a new list of letters and add all possible choices and their codeword
List <Letter> Letters = new List <Letter>()
{
};
Letters.Add(new Letter('A', "0000"));
Letters.Add(new Letter('B', "0001"));
Letters.Add(new Letter('C', "0010"));
Letters.Add(new Letter('D', "0011"));
Letters.Add(new Letter('E', "0100"));
Letters.Add(new Letter('F', "0101"));
Letters.Add(new Letter('G', "0110"));
Letters.Add(new Letter('H', "0111"));
Letters.Add(new Letter('I', "1000"));
Letters.Add(new Letter('J', "1001"));
Letters.Add(new Letter('K', "1010"));
Letters.Add(new Letter('L', "1011"));
Letters.Add(new Letter('M', "1100"));
Letters.Add(new Letter('N', "1101"));
Letters.Add(new Letter('O', "1110"));
Letters.Add(new Letter('P', "1111"));
//User chooses his letter
Console.WriteLine("Enter the letter to be encoded");
char input = Console.ReadKey().KeyChar;
Console.WriteLine();
//Searches chosen letter and assigns him to CodeWord type
CodeWord c1 = new CodeWord();
foreach (Letter letter in Letters)
{
if (letter.name == input)
{
foreach (char ch in letter.codeWord)
{
//Put the codeword string of letter into CodeWords list inputCodeWord
if (ch == '0')
{
c1.inputCodeWord.Add(0);
}
else
{
c1.inputCodeWord.Add(1);
}
}
break;
}
}
c1.PrintCodeWord(c1.inputCodeWord);
Console.WriteLine();
//Creating control (H) matrix with values of numbers one to seven by binary code
Matrix control = new Matrix(3, 7);
control.mat = new int[, ] {
{ 0, 0, 0, 1, 1, 1, 1 }, { 0, 1, 1, 0, 0, 1, 1 }, { 1, 0, 1, 0, 1, 0, 1 }
};
//Swapping columns for creating generating matrix
control.SwapColumns(control.mat, 0, 6);
control.SwapColumns(control.mat, 1, 5);
control.SwapColumns(control.mat, 3, 4);
//Creating generating (G) matrix using a unit matrix and a control matrix
Matrix generating = new Matrix(c1.inputCodeWord.Count, control.columns);
generating.mat = new int[generating.rows, generating.columns];
generating.FillGeneratingMatrix(generating.mat, control.mat, c1, control);
//Swapping columns back to original
generating.SwapColumns(generating.mat, 0, 6);
generating.SwapColumns(generating.mat, 1, 5);
generating.SwapColumns(generating.mat, 3, 4);
control.SwapColumns(control.mat, 0, 6);
control.SwapColumns(control.mat, 1, 5);
control.SwapColumns(control.mat, 3, 4);
Console.WriteLine("Generating matrix");
generating.Printmatrix(generating.mat);
Console.WriteLine();
//Securing input letter by Hamming 7/4 coding
c1.SecureCodeword(generating, generating.mat);
Console.WriteLine("Secure codeword");
c1.PrintCodeWord(c1.secureCodeWord);
Console.WriteLine();
//Choosing number of faults to be generated in secured codeword
Console.WriteLine("Enter number (0 - 3) of faults");
int numberOfFaults = Convert.ToInt32(Console.ReadLine());
Console.WriteLine();
//Making faults on random places of secured codeword
List <int> PositionsOfFaults = new List <int>()
{
};
c1.GeneratePositionsOfFaults(numberOfFaults, PositionsOfFaults);
c1.MakeFaults(PositionsOfFaults);
Console.WriteLine($"Secure codeword with {numberOfFaults} faults");
c1.PrintCodeWord(c1.secureCodeWord);
Console.WriteLine();
Console.WriteLine("Control matrix");
control.Printmatrix(control.mat);
Console.WriteLine();
//Counting syndrome of secured codeword with some faults
Console.WriteLine("Syndrome of the codeword");
c1.Syndrome(control, control.mat);
Console.WriteLine();
//If user choose only one fault, program will correct it
c1.CorrectCodeword(numberOfFaults);
c1.FindInformationBits(control.rows);
Console.WriteLine();
Console.WriteLine("Recieved codeword without security");
c1.PrintCodeWord(c1.outputCodeWord);
Console.WriteLine();
c1.FindRecievedLetter(Letters);
}
