Paper Code: ETEC-208	L          T          C
Paper: Communication Systems & Circuits – I	3           1           4

UNIT - I

Introduction to Electronic Communication systems:

Introduction, Electronic communication system, Frequency spectrum of EM waves, Modulation, Bandwidth and information capacity, Transmission.

Noise:

Internal noise (Thermal, shot , Transit time Miscellaneous); External noise ( Atmospheric , Industrial , Extra Terrestrial); Noise calculations; Noise figure; Noise temperature.

UNIT - II

Amplitude Modulation systems:

Transmission (Principle, spectrum, efficiency, power and current calculation); AM envelop; AM Modulator circuits; AM transmitters; QAM; AM Receivers: Receiver Parameters; (Selectivity, sensitivity, dynamic range, fidelity); TRF Receiver; Superhetrodyne receiver, Low noise Amplifier, Mixer / converter, Noise limiter, Automatic Gain Control circuit

Single sideband communication systems:

Single Sideband system, AM SSB full carrier, AM SSB reduced carrier, AM SSB suppressed carrier, AM independent sideband, AM vestigial sideband, Comparison of single sideband transmission to conventional AM, Single sideband generation methods; Single sideband transmitter.

UNIT - III

Angle Modulation system:

Mathematical Analysis, Deviation sensitivity, Waveforms, Phase deviation and modulation index, Frequency analysis of angle modulated system, Bandwidth requirement of angle modulated system; Noise and angle modulation, Preemphasis and deemphasis, Generation of FM waves, Demodulation of FM waves, Angle Modulation vs. amplitude modulation.

UNIT - IV

Pulse Analog Modulation, Nyquist theorem: Practical sampling, PAM, PWM and PPM generation and detection.

Noise in CW modulation:

Noise calculation in communication system, Noise in Amplitude modulation system, Noise in Angle modulated system, Narrow band noise.

TEXT BOOKS:

1. George Kennedy, “Communication System” TMH – 4th Edition
2. B. P. Lathi, “ Modern Digital and Analog Communication System” Oxford University Press – 3rd Edition.

REFERENCE BOOKS:

1. Simon Haykin ,  “Communication Systems” John Wiley & Sons, Inc 4th Edition.
2. Taub Schilling, “Principles of Communication Systems” TMH, 2nd Edition
3. P. Chakravarti, “Analog Communication Systems” Dhanpatrai & Co.