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+// Exa 8.3
+// To demostrate 4X4 Bit interleaving/de-interleving.
+
+clc;
+clear all;
+
+BitStream= [0 0 0 0 0 1 1 1 0 0 0 1 0 0 0 1];//Last bit to first bit
+
+//solution
+disp("Interleaving is performed by storing the data in a table containing rows and  columns at the transmitter. The data is written in rows and transmitted in a vertical direction (according to columns). At the receiver, the data is written and read in the opposite manner. ")
+
+// Interleaver
+              Input1=[1 0 0 0      //Writing data row wise
+                      1 0 0 0
+                      1 1 1 0
+                      0 0 0 0];
+disp("GIven Bit stream is")
+disp(BitStream);
+disp("Input to interleaver is")
+disp(Input1);
+
+Output1=[0 0 0 0 0 1 0 0 0 1 0 0 0 1 1 1];    // Reading data column wise
+disp("Output of interleaver is");
+disp(Output1);
+//De-interleaver
+              Input2=[1 1 1 0  //Writing o/p data row wise
+                      0 0 1 0    
+                      0 0 1 0
+                      0 0 0 0];
+ // Let From 6th to 9th bits have Burst Error 
+ disp("Input to de-interleaver is");
+ disp(Input2);
+ //Output of deinterleaver
+                             
+Output2= [0 0 0 0 0 1 1 1 0 0 0 1 0 0 0 1]; 
+disp("Output of de-interleaver is")
+disp(Output2);
+disp( "Bits with Burst error were from 6th to 9th. But in output of de-interleaver, they relocated to positions 3rd, 6th, 10th and 14th.");