5EE6.2-PRINCIPLE OF COMMUNICATION SYSTEMS |
Units: I-Noise Effects in Communication Systems: |
Resistor noise, Networks with reactive elements,
Noise temperature, Noise bandwidth, effective input noise temperature, Noise figure. Noise
figure & equivalent noise temperature in cascaded circuits.
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Units: II-Amplitude Modulation: |
Frequency translation, Recovery of base band signal, Spectrum &
power relations in AM systems. Methods of generation & demodulation of AM-DSB, AMDSB/
SC and AM-SSB signals. Modulation & detector circuits for AM systems. AM
transmitters & receivers. |
Units: III-Frequency Modulation: |
Phase & freq. modulation & their relationship, Spectrum &
bandwidth of a sinusoidally modulated FM signal, phasor diagram, Narrow band & wide band
FM. Generation & demodulation of FM signals. FM transmitters & receivers, Comparison of
AM, FM & PM. Pre emphasis & de-emphasis. Threshold in FM, PLL demodulator.
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Units: IV-Noise in AM and FM: |
Calculation of signal-to-noise ratio in SSB-SC, DSB-SC, DSB with
carrier, Noise calculation of square law demodulator & envelope detector. Calculation of S/N
ratio in FM demodulators, Super-heterodyne receivers.
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Units: V-Pulse Modulation Systems: |
Sampling theorem, Generation and demodulation methods of
PAM, PWM, PPM.
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