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EX-604 (C) RGPV B.Tech

Analog & Digital Communication (ADC)

The official syllabus is free to read, no account needed.

Syllabus, notes and important questions for EX-604 (C)

Syllabus units

Topics as the official RGPV syllabus lists them.

Unit 1 Signal Representation and System Response 10 topics
  • Time domain and frequency domain representation of signal
  • Fourier Transform and its properties
  • Transform of gate and 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 and convolution with impulse function
  • Causal and non‑causal system impulse response of ideal low‑pass filter
  • Correlation and autocorrelation
Unit 1 notes
Unit 2 Modulation Techniques 12 topics
  • Base‑band signal and need of modulation
  • Introduction to modulation techniques
  • Amplitude modulation (AM) – equation and frequency‑domain representation
  • Bandwidth and power distribution of AM signals
  • 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
  • Angle modulation – frequency and phase modulation equations, phase and frequency deviations
  • Modulation index and frequency spectrum
  • Narrowband FM (NBFM) and wideband FM (WBFM)
  • Bandwidth comparison of modulation techniques
Unit 2 notes
Unit 3 Sampling and Digital Coding 16 topics
  • Sampling of signal
  • Sampling theorem for low‑pass and band‑pass signals
  • Pulse amplitude modulation (PAM)
  • Time‑division multiplexing (TDM)
  • Channel bandwidth for PAM‑TDM signals
  • Types of sampling: instantaneous, natural and flat‑top
  • Aperture effect
  • Pulse‑position and pulse‑duration modulations
  • Digital signal quantization and quantization error
  • Pulse code modulation (PCM) and signal‑to‑noise ratio
  • Companding
  • Data rate, baud rate and bit rate
  • Multiplexed PCM signal
  • Differential PCM (DPCM)
  • Delta modulation (DM) and adaptive delta modulation (ADM)
  • Comparison of various digital coding systems
Unit 3 notes
Unit 4 Digital Modulation Techniques 10 topics
  • Generation, detection, equations 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 concepts
  • Introduction to probability of error
Unit 4 notes
Unit 5 Information Theory and Coding 11 topics
  • Information theory – information, entropies (marginal and conditional)
  • Model of a communication system
  • Mathematical representation of source, channel and receiver characteristics
  • Mutual information and channel capacity
  • Efficiency of noise‑free channel
  • Binary symmetric channel (BSC) and binary erasure channel (BEC)
  • Repetition codes and NM‑symmetric binary channel
  • Shannon theorem and Shannon‑Hartley theorem (S/N‑BW trade‑off)
  • Source encoding – Shannon, Fano and Huffman coding methods and their efficiency
  • Error‑control coding – minimum Hamming distance, linear block codes, cyclic codes, convolutional codes
  • Line encoding – Manchester coding, RZ, NRZ coding
Unit 5 notes
Read the full syllabus

Exam insights

Counted from 5 past EX-604 (C) papers.

Marks asked per paper, by unit

  • Unit 1 Signal Representation and System Response 7 marks
  • Unit 2 Modulation Techniques 8 marks
  • Unit 3 Sampling and Digital Coding 7 marks
  • Unit 4 Digital Modulation Techniques 8 marks
  • Unit 5 Information Theory and Coding 6 marks

Average marks of the questions from each unit in one paper. You answer only some of them, so the total is more than the paper’s maximum.

Asked again and again

  1. Derive the Fourier Transform of a rectangular pulse of width $T$ and amplitude $A$, and discuss its spectral characteristics.

    Asked 4 times: 2020, 2021, 2022, 2023

  2. Explain Amplitude Modulation (AM) with its mathematical expression, draw the spectrum and comment on carrier and side‑band power distribution.

    Asked 4 times: 2020, 2021, 2022, 2023

  3. State the Nyquist sampling theorem and illustrate its application with a band‑limited signal of bandwidth $B$.

    Asked 3 times: 2021, 2022, 2023

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