Angle Modulation Techniques and FM Receivers (ECE-3001)

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 SYLLABUS (THIS DOC CONTAINS MODULE-4,5)

 
Module 1 Introduction to Communication Systems: 
Need and Importance of Communication, Elements of a Communication System, Types of communication systems - Electromagnetic Spectrum used in communication, concept of bandwidth and power, Receiver characteristics,Need for modulation.

Module 2 Linear Modulation:
 Amplitude modulation – frequency spectrum of AM– Power in AM wave – Generation of AM signal - Square law modulator, switching modulator,AM demodulation - Envelope and square law demodulation.

Module 3 Bandwidth and Power Efficient AM Systems: 
DSB-SC modulation, Power saving in DSB-SC, Synchronous detection, Quadrature null effect, SSB-SC, VSB generation and demodulation.Comparison of linear modulation systems with respect to power, bandwidth and receiver complexity, Low level and high level AM transmitters.

Module 4 Angle Modulation:
Principle of frequency and phase modulation – Relation between FM and PM waves – Frequency
deviation, Bandwidth of FM – Narrow band and wide band FM, FM transmitter, Bessel functions and
Carson’s rule – Generation of FM and PM wave- Comparison of AM and FM.

Module 5 Demodulation of Angle Modulated Signals
FM detectors – slope detectors – Phase discriminators – Ratio detectors. Feedback Demodulators - The Phase Locked Loop-Frequency Compressive Feedback Demodulator.Pre-emphasis and de-emphasis.

Module 6 Receivers and Noise in Communication Systems
Tuned Radio Frequency (TRF),Super-heterodyne receiver(AM and FM) - Choice of IF and Oscillator
frequencies – Tracking – alignment – AGC, AFC Noise and its types. Noise voltage - Signal-to-noise ratio - Noise figure - Noise temperature - Noise figure, Figure of Merit in DSB-SC, SSB, AM and FM receivers

Module 7 Pulse Modulation Systems
Sampling theorem, Types of Sampling. Pulse modulation schemes – PAM, PPM and PWM generation and detection-Pulse code modulation. Conversion of PWM to PPM. Multiplexing Techniques - FDM and TDM - problems related to FDM and TDM.



























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