ECE – 403 COMMUNICATION SYSTEMS - I

Spectral Analysis: Fourier Series, Response of a linear system, Normalized power in a Fourier expansion, Power Spectral density. The Fourier Transform, Convolution, Parseaval’s Theorem, Power & Energy Transfer through a network, Auto and Cross correlation.

Random variables and Processes: Probability, Mutually exclusive events, Joint probability, Statistical independence, Random variables, Probability density function, Average and variance. The Gaussian probability density. The error function, Mean and Variance of sum of random variables, Probability density of Z=X+Y. The Central limit theorem, correlation between random variables, auto correlation, power spectral density.

Amplitude Modulation systems: Frequency translation, Recovery of base band signal, Amplitude Modulation, Maximum Allowable Modulation. The square Law demodulator, Spectrum of AM signal, Balanced Modulator, SSB modulation and generation, VSB, FDM.

Frequency Modulation Systems: Phase and frequency modulation and their relationship, Frequency deviation, Spectrum of FM signal, BW of FM signal, Effect of modulation on BW, Constant BW, FM phaser diagram, Narrow band FM, Armstrong and Parameter Variation Methods of FM generation.

FM Demodulators Digital Modulation Techniques: Sampling theorem, Quantization of signals, Quantization error, Pulse Code modulation (PCM) and the system, Companding, Time Division Multiplexing (TDM), DPCL, DM, ADM, PSK, FSK, DPSK.

Noise in Communication System: Source of noise, register noise, available power, noise temperature, noise bandwidth, input noise temperature, noise figure, equivalent noise temperature in cascade, an example of receiving system

TEXTBOOKS

1. Principles of communication systems - by H. Straub and D.L.Shilliing

2. An introduction to the Principles of Communication Theory - by J.C.Hancock, McGraw Hill

3. Modern Digital and Analog Communication Systems - by B.P. Lathi, Prism Books Pvt. Ltd.

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