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diff --git a/3446/CH9/EX9.3/Ex9_3.sce b/3446/CH9/EX9.3/Ex9_3.sce
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+// Exa 9.3
+// To calculate final phase for the pi/4-DQPSK modulation method.
+
+clc;
+clear all;
+
+B=['00','10','01','11','01','00','11','10','10','01','01','00'];//Given Bit stream
+
+//solution
+disp("Phase transition table for pi/4-DQPSK Modulation is given as   ")
+disp(" By Referring Table 9.1 on page No 266 i.e");
+disp("Symbol    Phase transition")
+disp("00     =>    45°");
+disp("01     =>   135°"); 
+disp("10     =>   -45°");
+disp("11     =>  -135°");
+disp("");
+disp("sym      Dell phi(k)   Phi(k)")
+//BitStream='001001110100111010010100';
+
+phase=0; //Taking initial phase as zero
+for i=1:12
+
+   
+    if(B(i)=='00')
+      phase=phase+45;  
+      printf(' %s          45          %d \n',B(i),phase);
+    end
+
+    if(B(i)=='01')
+        phase=phase+135;
+       printf(' %s         135          %d \n',B(i),phase);
+    end
+    if(B(i)=='10')
+        phase=phase-45;
+       printf(' %s         -45          %d \n',B(i),phase);
+    end
+    if(B(i)=='11')
+        phase=phase-135;
+       printf(' %s        -135          %d \n',B(i),phase);
+   
+end
+end
+disp("");
+printf('final phase for the pi/4-DQPSK modulation method for given bitstream is %d degree\n',phase);