Add ASK BPSK DQPSK(not implemented yet) FFT QPSK WAV

ASK/ask.c

@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+#include "../WAV/wav.h"
+
+// Fréquence d'échantillonage
+#define FS 44100 
+// Temps d'échantillonage
+#define TS 0.05
+// Nombre d'échantillions
+#define NS (int)(FS*TS)
+// Amplitude du signal
+#define A 22767 
+// Fréquence de la porteuse
+#define FC 400 
+
+// Fonction de concaténation deux tableau
+double* concat_tab(double **t, int a, int b) {
+    double* tf = malloc(sizeof(double) * a * b);
+
+    int pos = 0;
+    for (int i = 0; i < b; i++) {
+        for (int j = 0; j < a; j++) {
+            tf[pos] = t[i][j];
+            pos++;
+        }
+    }
+
+    return tf;
+}
+
+// Fontion permetant la modulation d'un bit
+double* modulation_unique(int b) {
+    double* s = (double*)malloc(NS * sizeof(double));
+    
+    int c = (b == 0) ? A / 2 : A; 
+
+    for (int n = 0; n < NS; n++) {
+        s[n] = c * cos(2 * M_PI * FC * ((double)n / FS));
+    }
+    return s;
+}
+
+// Fonction permetant la modulation d'un suite de bits
+double* modulation(int* b, int nb_symbole) {
+    double** s = (double**)malloc(sizeof(double*) * nb_symbole);
+   
+    for (int k = 0; k < nb_symbole; k++) {
+        s[k] = modulation_unique(b[k]);
+    }
+
+    double *sf = concat_tab(s, NS, nb_symbole);
+
+    for (int i = 0; i < nb_symbole; i++) {
+        free(s[i]);
+    }
+    free(s);
+
+    return sf;
+}
+
+int* askdemodulation(double* r, int nb_symbole) {
+    int* sb = (int*)malloc(sizeof(int) * nb_symbole);
+
+    double thr = (A + A / 2.0) / 4.0;
+
+    for (int k = 0; k < nb_symbole; k++) {
+        double sum = 0;
+       for (int n = 0 ; n < NS; n++) {
+           sum += fabs(r[k * NS + n]);
+       }
+       double avg = sum / NS;
+       sb[k] = (avg > thr) ? 1 : 0;
+    }
+
+
+
+    return sb;
+}
+
+int main() {
+    int bits[] = {0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1,0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1,0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1,0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1};
+
+    int nb_symbole = (sizeof(bits) / sizeof(bits[0])) / 2;
+
+    for (int i = 0; i < 2 * nb_symbole; i++) {
+       printf("%d ", bits[i]);
+    }
+    printf("\n");
+
+    double* sf = modulation(bits, 2 * nb_symbole);
+
+    write_wav("signal.wav", sf, (double)NS * (double)nb_symbole);
+    
+    int wav_len;
+    double* wav_data = read_wav("signal.wav", &wav_len);
+
+    int* dbits = askdemodulation(wav_data, 2 * nb_symbole);
+
+    for (int i = 0; i < 2 * nb_symbole; i++) {
+       printf("%d ", dbits[i]);
+    }
+    printf("\n");
+
+    free(sf);
+    return 0;
+}
+
+