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-rw-r--r--buch/papers/reedsolomon/experiments/f.m61
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+#
+# f.m -- Reed-Solomon-Visualisierung mit FFT
+#
+# (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+#
+N = 64;
+b = 32;
+l = N + b;
+
+signal = zeros(l,1);
+signal(1:N,1) = round(10 * rand(N,1));
+signal
+
+plot(abs(signal));
+xlim([1, l]);
+title("Signal");
+pause()
+
+codiert = fft(signal)
+
+plot(abs(codiert));
+xlim([1, l]);
+title("Codiert");
+pause()
+
+fehler = zeros(l,1);
+fehler(21,1) = 2;
+fehler(75,1) = 1;
+fehler(7,1) = 2;
+
+plot(fehler);
+xlim([1, l]);
+title("Fehler");
+pause()
+
+empfangen = codiert + fehler;
+
+plot(abs(empfangen));
+xlim([1, l]);
+title("Empfangen");
+pause()
+
+decodiert = ifft(empfangen)
+plot(abs(decodiert));
+xlim([1, l]);
+title("Decodiert");
+pause()
+
+syndrom = decodiert;
+syndrom(1:N,1) = zeros(N,1)
+plot(abs(syndrom));
+xlim([1, l]);
+title("Syndrom");
+pause()
+
+locator = abs(fft(syndrom))
+
+plot(locator);
+xlim([1, l]);
+title("Locator");
+pause()