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IT-404 · Analog & Digital Communication/Official Syllabus

Analog & Digital Communication (IT-404) - Official Syllabus

1
Unit 1

Signals and Systems

  • Block diagram of a communication system
  • signal-definition
  • types of signals continuous, discrete, deterministic, non-deterministic, periodic, non-periodic, energy, power, analog and digital signals
  • Electromagnetic Spectra
  • Standard signals- DC, sinusoidal, unit step, ramp, signum, rectangular pulse, impulse(delta) signal
  • System definition
  • classification of systems, linear, nonlinear, time variant, time invariant, causal, non causal, stable and unstable systems
  • Fourier transforms: Time domain and frequency domain representation of signal
  • Fourier Transform and its properties
  • conditions for existence
  • Transform of Gate, unit step, constant, impulse, sine and cosine wave
  • Shifting property of delta function
  • convolution
  • time and frequency convolution theorems
2
Unit 2

Amplitude modulation

  • Modulation, need of modulation
  • types of modulation techniques
  • amplitude modulation (DSB-FC)
  • modulation index
  • frequency spectrum of AM wave
  • linear and over modulation
  • power relation in AM
  • transmission efficiency
  • modulation by a complex signal
  • bandwidth of AM
  • AM modulators, square law and switching modulator
  • advantages and disadvantages of AM
  • Demodulation of AM: Suppressed carrier amplitude modulation systems, DSB-SC, SSB-SC, VSB-SC systems
  • comparison of various amplitude modulation systems
  • Demodulation of AM, square law and envelope detector
  • synchronous detection of AM
  • Low and high power AM transmitters
  • AM receivers, TRF and superheterodyne receivers
  • sensitivity, selectivity and fidelity of receivers
3
Unit 3

Angle modulation

  • Introduction and types of angle modulation
  • frequency modulation, frequency deviation, modulation index, deviation ratio
  • bandwidth requirement of FM wave
  • types of FM
  • Phase modulation
  • difference between FM and PM
  • Direct and indirect method of FM generation
  • FM demodulators- slope detector, Foster seeley discriminator, ratio detector
  • Introduction to pulse modulation systems
4
Unit 4

Sampling of signal and Pulse Modulation

  • 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
5
Unit 5

Digital modulations techniques

  • 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)

Laboratory Experiments

  • AM Modulation and Demodulation (Envelope Detector)
  • Frequency modulation using reactance modulator.
  • Frequency modulation using varactor modulator.
  • Pulse Amplitude Modulation and Demodulation
  • Pre-emphasis and De-emphasis
  • Analog Multiplexing.
  • Amplitude Modulation using Pspice
  • Receiver characteristics (selectivity, sensitivity, fidelity).
  • Operation of foster-seeley loop detector.
  • Operation of ratio detector.

Reference Books

  • Communication Systems — Singh, Sapre — TMH
  • Principles of Communication Systems — Taub Schilling — TMH
  • Electronic Communications Systems — W. Tomasi — Pearson Education Pvt. Ltd.
  • Communication Systems — Taub, shilling — TMH
  • Analog and Digital Communication — Abhay Gandhi — CENGAGE Learning
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