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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.");