Digital CommunicationsR16 semester 3-1 lecture notes

Digital Communications

UNIT I

PULSE DIGITAL MODULATION: components of electronic communication systems, blessings of electronic communication systems, components of PCM: Sampling, quantisation , quantisation error, Companding in PCM systems. Differential PCM systems (DPCM). Delta modulation, its draw backs, adaptive delta modulation, comparison of PCM and DM systems, noise in PCM and DM systems.

UNIT II

DIGITAL MODULATION TECHNIQUES: Introduction, ASK, FSK, PSK, DPSK, DEPSK, QPSK, M-ary PSK, ASK, FSK, similarity of BFSK and BPSK.

UNIT III

information TRANSMISSION : Base band signal receiver, likelihood of error, the optimum filter, matched filter, likelihood of error victimisation matched filter, coherent reception, non-coherent detection of FSK, calculation of error likelihood of raise, BPSK, BFSK,QPSK.

UNIT IV

info THEORY: separate messages, idea of quantity of data and its properties. Average info, Entropy and its properties. info rate, Mutual info and its properties.

UNIT V

supply CODING: Introductions, Advantages, Shannon’s theorem, Shanon-Fano committal to writing, Huffman committal to writing, potency calculations, data rate of separate and analog Channels, capability of a mathematician channel, information measure –S/N trade off.

UNIT VI

LINEAR BLOCK CODES: Introduction, Matrix description of Linear Block codes, Error detection and error correction capabilities of Linear block codes, playing codes, Binary cyclic codes, algebraical structure, encoding, syndrome calculation, BCH Codes. CONVOLUTION CODES: Introduction, cryptography of convolution codes, time domain approach, rework domain approach. Graphical approach: state, tree and trellis diagram cryptography victimisation Viterbi rule.

TEXT BOOKS:

1. Digital communications – Simon Haykin, John Wiley, 2005
2. Principles of Communication Systems – H. Taub and D. Schilling, TMH, 2003
   REFERENCES:
3. Digital and Analog Communication Systems – surface-to-air missile Shanmugam, John Wiley, 2005.
4. Digital Communications – John Proakis, TMH, 1983. Communication Systems Analog & Digital – Singh & Sapre, TMH, 2004. 3. trendy Analog and electronic communication – B.P.Lathi, Oxford reprint, third edition, 2004.
   III Year – I Semester
   L T P C
   4 0 0 3
   DIGITAL COMMUNICATIONS

Students undergoing this course ar expected to:

Course Objectives:

1.Understand totally different pulse digital modulation techniques and their comparision a pair of.Familiarize numerous digital modulation techniques and calculation of their error possibilities three. perceive the idea of entropy and totally different supply committal to writing techniques four. Familirize with block codes, cyclic codes and convolutional codes

Course Outcomes:

once undergoing the course students are going to be ready to:

one. confirm the performance of various wave form committal to writing techniques for the generation and digital illustration of the signals.

2. confirm the likelihood of error for numerous digital modulation schemes

three. Analyze totally different supply committal to writing techniques

four. reckon and analyze totally different error management committal to writing schemes for the reliable transmission of digital info over the channel.