Update README.md

README.md

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 # A-Complete-Digital-Communication-System
 
-This project is the simulation of a complete digital communication system. A digital communication system consists of multiple blocks and each block is implemented here as a MATLAB function and 'main_code.m' file combines them all to build the complete system. The block diagram below shows all the block of the system in a sequential manner. 
+This project is the simulation of a complete digital communication system. A digital communication system consists of multiple blocks and each block is implemented here as a MATLAB function and 'main_code.m' file combines them all to build the complete system. The system reads text file 'source_data.txt' from the Data folder and process the text data accordingly and writes the received text into another text file named 'received.txt' again in the Data folder. 
+The block diagram below shows all the block of the system in a sequential manner. 
 
 ## Block-Diagram 
 <p align="center">
- <img src="https://user-images.githubusercontent.com/37298971/52767116-acbd0b80-3053-11e9-9998-4dd80c8a2825.png" width="500"
+ <img src="https://user-images.githubusercontent.com/37298971/52767116-acbd0b80-3053-11e9-9998-4dd80c8a2825.png" width="650"
 </p>
 
+Each block is built using the following techniques. 
+- Source Coding: Huffman encoding 
+- Channel Coding: Convolutional encoding 
+- Modulation: Amplitude Shift Keying (ASK), and Phase Shift Keying (PSK) modulation 
+- Channel: Additive White Gaussian Noise Channel 
+- Demodulation: ASK and PSK demodulation 
+- Channel Decoding: Viterbi decoding 
+- Source Decoding: Huffman decoding 
+
+## Simulation
+The simulation is performed using the following properties. 
+<p align="center">
+ <img src="https://user-images.githubusercontent.com/37298971/52767863-eabb2f00-3055-11e9-93eb-ac5ba3d782a8.png" width="800"
+</p>
+
+### Performance 
+
+<p align="center">
+ <img src="https://user-images.githubusercontent.com/37298971/52768106-aed49980-3056-11e9-9e31-5dbf125b494e.png" width="620"
+</p>
+
+From reading the ‘source_data.txt’ file to write the received data to a ‘received_data.txt’ file requires only 31.90s.