Unit-I
Time domain and frequency domain representation of signal, Fourier Transform and its
properties, Transform of Gate, Periodic gate, Impulse periodic impulse sine and cosine wave,
Concept of energy density and power density (Parseval’s theorem), Power density of periodic gate
and impulse function, impulse response of a system, convolutions, convolution with impulse function,
causal and non causal system impulse response of ideal low pass filter, Correlation & Auto
correlation.
Unit-II
Base band signal, need of modulation, Introduction of modulations techniques,Amplitude
modulation, Equation and its frequency domain representation, Bandwidth, Power distribution. AM
suppressed carrier waveform equation and frequency domain representation Generation
(Balance/Chopper modulator) and synchronous detection technique, errors in synchronous
detection, Introduction to SSB and VSB Transmission Angle modulation, Frequency and phase
modulation equation and their relative phase and frequency deviations, modulation index frequency
spectrum, NBFM and WBFM, Bandwidth comparison of modulation techniques.
Unit-III
Sampling of signal, sampling theorem for low pass and Band pass signal, Pulse amplitude
modulation (PAM), Time division, multiplexing (TDM). Channel Bandwidth for PAM-TDM signal Type
of sampling instantaneous, Natural and flat top, Aperture effect, Introduction to pulse position and
pulse duration modulations, Digital signal, Quantization, Quantization error, Pulse code modulation,
signal to noise ratio, Companding, Data rate and Baud rate, Bit rate, multiplexed PCM signal,
Differential PCM (DPCM), Delta Modulation (DM) and Adaptive Delta Modulation (ADM), comparison
of various systems.
Unit-IV
Digital modulations techniques, Generation, detection, equation and Bandwidth of amplitude
shift keying (ASK) Binary Phase Shift keying (BPSK), Differential phase shift keying (DPSK), offset
and non offset quadrature phase shift keying (QPSK), M-Ary PSK, Binary frequency Shift Keying
(BFSK), M-Ary FSK Quadrature Amplitude modulation (QAM), MODEM, Introduction to probability of
error.
Unit-V Information theory and coding- Information, entropies (Marginal and conditional), Model of a
communication system, Mathematical representation of source, channel and receiver characteristics,
Mutual information, channel capacity efficiency of noise free channel Binary symmetric channel
(BSC) Binary erasure channel (BEC), Repetition of signal, NM symmetric Binary channel, Shannon
theorem, Shanon-Hartley theorem (S/N-BW trade off)Source encoding code properties; Shanon,
Fano and Huffman coding methods and their efficiency error control coding, Minimum Hamming
distance, Linear Block Code, Cyclic code and convolution codes. Line Encoding: Manchester coding,
RZ, NRZ coding.
References:
1. Singh & Sapre, Communication System, TMH
2. Taub & shilling, Communication System, TMH
3. Hsu; Analog and digital communication(Schaum); TMH
4. B.P. Lathi, Modern Digital and analog communication system,
5. Simon Haykins, Communication System. John Willy
6. Wayne Tomasi, Electronic Communication system.
7. Martin S. Roden, Analog & Digital Communication System; Discovery Press.
8. Frank R. Dungan, Electronic Communication System, Thomson/Vikas.
List of Experiments(Expandable)
1. Study of sampling process and signal reconstruction and aliasing.
2. Study of PAM PPM and PDM
3. Study of PCM transmitter and receiver.
4. Time division multiplexing (TDM) and De multiplexing
5. Study of ASK PSK and FSK transmitter and receiver.
6. Study of AM modulation and Demodulation techniques (Transmitter and Receiver) Calculate of
parameters
7. Study of FM modulation and demodulation (Transmitter and Receiver) & Calculation of
parameters
8. To construct and verify pre emphasis and de-emphasis and plot the wave forms.
9. Study of super hetrodyne receiver and characteristics of ratio radio receiver.
10. To construct frequency multiplier circuit and to observe the waveform
11. Study of AVC and AFC.
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