\5EE6.2 PRINCIPLE OF COMMUNICATION SYSTEMS

Unit-1 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.
Unit-2 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.
Unit-3 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.
Unit-4 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.
Unit-5 Pulse Modulation Systems: Sampling theorem, Generation and demodulation methods of PAM, PWM, PPM.

Reference/Suggested Books
1. Taub and Schilling: Principles of Communication Systems 3/e, TMH
2. B P Lathi : Modern Analog & Digital Communication System, Oxford University Press
3. Simon Hykin: Communication Systems, John Wiley and Sons
4. R P Singh and S D Sapre: Communication System Analog & Digital 2/e. (TMH)
5. G. Kennedy and B. Davis , “Electronic Communication Systems” Tata McGraw Hill
6. Roy Blake, “ Wireless Communication Technology” Thomson Asia Pvt. Ltd. Singapore