Practical understanding of the operating principle of digital communication systems

Abstract

There are many students and researchers who don’t deeply understand the practical operating principle of digital communication system. Hence, in this paper, the digital communication system is studied with brief implementation of each block diagrams. In the system kit development, text and audio inputs are taken and encrypted with different encryption techniques including additive cipher, multiplicative cipher and affine ciphers. The encrypted data is converted in to 8-bit binary data stream. Then, the channel is encoded with distinct channel coding techniques including linear block encoder, cyclic encoder and convolutional encoder. The line coded bits are band passed by digital modulation schemes after the channel coding. Finally, the developed software is tested with equivalent inputs of a digital TV broadcasting and the results have correctly matched according to the theoretical analysis of the digital communication systems. Hence, students can be easily benefited from this practical understanding of the digital communication systems.