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+#X text 57 137 possible symbols: -1 \, 1;
+#X text 55 160 the decision device is implemented by d=sign(y);
+#X text 72 40 DECISION-DIRECTED CHANNEL EQUALIZATION;
+#X text 27 189 The adaptive equalizer tries to invert the channel \,
+so that the overal system has a flat frequency response and there are
+almost no bit errors.;
+#X text 28 280 We simulate the transmission with a simple bandpass
+filter and a delay (= the channel).;
+#X text 28 241 Bit errors are plotted over time for equalized and unequalized
+transmission.;
+#X text 27 83 This patch simulates the equalization of a baseband transmission
+of a binary signal (similar to the adaptation process in e.g. a modem).
+;
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+#X text 21 30 OBSERVATIONS;
+#X text 19 77 You can see that if you train the system long enough
+there are almost no bit errors.;
+#X text 20 126 A critical parameter is the delay: If you don't find
+the exact delay of the channel adaptation works very bad for uncorrelated
+training sequences.;
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