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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.");
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