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B.Tech. IT 4th Sem Subject: Introduction to Communication
UNIT – 1 Introduction to communication system, Representation of signals and systems, Modulation, Need for modulation, Amplitude modulation, Modulation Index, Frequency spectrum for AM wave, Power control in AM wave, Balanced modulator, The square law demodulator, DSB-SC modulation.
UNIT – 2 Phase modulation, Frequency Modulation & their relationship, frequency deviation, spectrum of FM signals, effect of modulation on BW, Method of FM generation and FM demodulators.
UNIT – 3 Sampling theorem, Pulse modulation, PAM, PPM, PWM, quantization of signals, Pulse code modulation(PCM), Time division multiplexing (TDM), DPCM, DM, ADPCM, Introduction to ASK, FSK, PSK.
UNIT – 4 Spread spectrum, spread spectrum modulation, requirement of spread spectrum signals, classification of pread spectrum system, Frequency hopped spread spectrum system, Advantages and Limitations of DS & FH system, CDMA spread spectrum system, Application of spread spectrum.
UNIT – 5 Components & block diagram of satellite communication system, Transponders, up-link, down-link, Budget calculations, Keplea’s law and Geostationary orbit, satellite multiple access techniques, Fiber Optic communication Principle of light propagation inoptical fiber, losses in fiber, dispersion, connectors and splices, Fiber optic communication link.
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