1 files changed, 35 insertions, 0 deletions
diff --git a/2414/CH19/EX19.7/Ex19_7.sce b/2414/CH19/EX19.7/Ex19_7.sce
new file mode 100755
index 000000000..3556a61a3
--- /dev/null
+++ b/2414/CH19/EX19.7/Ex19_7.sce
@@ -0,0 +1,35 @@
+clc;
+close();
+clear();
+//page no 609
+//prob no. 19.7
+code=[0 0 1 1 1 0 0 0 0 0 0 1];
+t=[0:.01:2]   //for x-axis
+y=[]
+x=[]
+p=0   //phase shift
+for i=1:2:length(code)
+    if code(i)==0 then
+        if code(i+1)==0 then
+            p=p+0
+        else
+            p=p+%pi/2
+        end
+    else
+        if code(i+1)==1 then
+            p=p+%pi
+        else
+            p=p+3*%pi/2
+        end
+    end
+    y=[y sin(2*%pi.*t+p)];
+    x=[x 2*%pi.*(t+(i-1))];
+end
+   
+clf()
+plot(x,y);
+a=gca(); // Handle on axes entity
+a.x_location = "origin"; 
+a.y_location = "origin";
+xtitle('DQPSK used to encode 001110000001','Time','amplitude');
+xgrid