DATA TRANSMISSION :
Base band signal receiver, probability of error, the optimum filter, matched filter, probability of error using matched filter
, coherent reception, non-coherent detection of FSK, calculation of error probability of ASK, BPSK, BFSK,QPSK.
Discrete messages, concept of amount of information and its properties. Average information
, Entropy and its properties. Information rate, Mutual information and its properties.
Introductions, Advantages, Shannon’s theorem, Shanon-Fano coding, Huffman coding, efficiency calculations
, channel capacity of discrete and analog Channels, capacity of a Gaussian channel, bandwidth –S/N trade off.
LINEAR BLOCK CODES:
Introduction, Matrix description of Linear Block codes, Error detection and error correction capabilities of Linear block codes, Hamming codes
, Binary cyclic codes, Algebraic structure, encoding, syndrome calculation, BCH Codes.
Introduction, encoding of convolution codes
, time domain approach, transform domain approach. Graphical approach: state, tree and trellis diagram decoding using Viterbi algorithm.
Digital communications - Simon Haykin, John Wiley, 2005
Principles of Communication Systems – H. Taub and D. Schilling, TMH, 2003
Digital and Analog Communication Systems - Sam Shanmugam, John Wiley, 2005.
Digital Communications – John Proakis, TMH, 1983. Communication Systems Analog & Digital – Singh & Sapre, TMH, 2004.
Modern Analog and Digital Communication – B.P.Lathi, Oxford reprint, 3rd edition, 2004.
Students undergoing this course are expected to:
1.Understand different pulse digital modulation techniques and their comparision 2.Familiarize various digital modulation techniques and calculation of their error probabilities
Understand the concept of entropy and different source coding techniques
Familirize with block codes, cyclic codes and convolutional codes
After undergoing the course students will be able to:
Determine the performance of different waveform coding techniques for the generation and digital representation of the signals.
Determine the probability of error for various digital modulation schemes
Analyze different source coding techniques
Compute and analyze different error control coding schemes for the reliable transmission of digital information over the channel.
III Year - I Semester
ANTENNA AND WAVE PROPAGATION
L T P C
4 0 0 3
The student will be able to
understand the applications of the electromagnetic waves in free space.
introduce the working principles of various types of antennas
discuss the major applications of antennas with an emphasis on how antennas are employed to meet electronic system requirements.
understand the concepts of radio wave propagation in the atmosphere.
Introduction, Radiation Mechanism – single wire, 2 wire, dipoles, Current Distribution on a thin wire antenna. Antenna Parameters - Radiation Patterns
, Patterns in Principal Planes, Main Lobe and Side Lobes, Beamwidths, Polarization, Beam Area
, Radiation Intensity, Beam Efficiency, Directivity, Gain and Resolution, Antenna Apertures, Aperture Efficiency
, Effective Height, illustrated Problems.
THIN LINEAR WIRE ANTENNAS:
Retarded Potentials, Radiation from Small Electric Dipole, Quarter wave Monopole and Half wave Dipole – Current Distributions, Evaluation of Field Components
, Power Radiated, Radiation Resistance, Beamwidths, Directivity, Effective Area and Effective Height. Natural current distributions
, fields and patterns of Thin Linear Center-fed Antennas of different lengths, Radiation Resistance at a point which is not current maximum. Antenna Theorems – Applicability and Proofs for equivalence of directional characteristics, Loop Antennas: Small Loops - Field Components, Comparison of far fields of small loop and short dipole, Concept of short magnetic dipole
, D and Rr
relations for small loops.
ANTENNA ARRAYS :
2 element arrays – different cases, Principle of Pattern Multiplication, N element Uniform Linear Arrays – Broadside, End-fire Arrays, EFA with Increased Directivity
, Derivation of their characteristics and comparison; Concept of Scanning Arrays. Directivity Relations (no derivations). Related Problems. Binomial Arrays, Effects of Uniform and Non-uniform Amplitude Distributions, Design Relations. Arrays with Parasitic Elements, Yagi-Uda Arrays, Folded Dipoles and their characteristics.
NON-RESONANT RADIATORS :
Introduction, Traveling wave radiators – basic concepts
, Long wire antennas – field strength calculations and patterns, Microstrip Antennas-Introduction, Features, Advantages and Limitations, Rectangular Patch Antennas –Geometry and Parameters
, Impact of different parameters on characteristics. Broadband Antennas: Helical Antennas – Significance, Geometry, basic properties; Design considerations for monofilar helical antennas in Axial Mode and Normal Modes (Qualitative Treatment).