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EC-502 RGPV B.Tech

DIGITAL COMMUNICATION (DC)

Previous year papers and the official syllabus are free to read, no account needed.

Previous Year Papers

5 papers, latest Jun 2025

Free
See all 5 papers

Syllabus, notes and important questions for EC-502

Syllabus units

Topics as the official RGPV syllabus lists them.

Unit 1 Sampling theorem and multiplexing 10 topics
  • Sampling theorem for low‑pass and band‑pass signals
  • Ideal sampling
  • Natural sampling
  • Flat‑top sampling
  • Crosstalk
  • Aliasing
  • Time‑division multiplexing
  • PAM generation and detection
  • PWM generation and detection
  • PPM generation and detection
Unit 1 notes
Unit 2 Pulse Code Modulation and encoding techniques 16 topics
  • Pulse code modulation
  • Quantization
  • Quantization noise
  • Companding
  • Inter‑symbol interference
  • Eye pattern
  • Delta modulation
  • Adaptive modulation
  • On‑Off signaling
  • Polar signaling
  • RZ signaling
  • Bipolar signaling
  • AMI
  • Manchester code
  • Differential encoding
  • Advantages and disadvantages of encoding techniques
Unit 2 notes
Unit 3 Band‑pass data transmission modulation schemes 12 topics
  • Amplitude shift keying (ASK)
  • Binary phase shift keying (BPSK)
  • Quadrature phase shift keying (QPSK)
  • Differential phase shift keying (DPSK)
  • Coherent BFSK
  • Non‑coherent BFSK
  • Minimum shift keying (MSK)
  • Quadrature amplitude modulation (QAM)
  • M‑ary PSK concept
  • M‑ary FSK concept
  • Spectral properties of QPSK
  • Spectral properties of MSK
Unit 3 notes
Unit 4 Detection, signal space and error probability 9 topics
  • Matched filter detector
  • Correlator detector
  • Gram–Schmidt orthogonalization procedure
  • Signal space concept for probability‑of‑error computation
  • Error probability calculation for BPSK
  • Error probability calculation for QPSK
  • Error probability calculation for QAM
  • Error probability calculation for coherent BFSK
  • Comparison of different modulation techniques
Unit 4 notes
Unit 5 Information theory and error‑correcting codes 14 topics
  • Information theory concepts
  • Entropy
  • Information rate
  • Channel capacity
  • Shannon’s theorem
  • Shannon‑Hartley theorem
  • Bandwidth and signal‑to‑noise ratio trade‑off
  • Source encoding
  • Extension of zero‑memory source
  • Linear block codes
  • Cyclic codes
  • Encoder and decoder circuits for block/cyclic codes
  • Burst error‑correcting codes
  • Convolutional codes concepts
Unit 5 notes
Read the full syllabus

Exam insights

Counted from 5 past EC-502 papers.

Marks asked per paper, by unit

  • Unit 1 Sampling theorem for low pass and band pass signals 21 marks
  • Unit 2 Pulse code modulation 27 marks
  • Unit 3 Band pass data transmission 27 marks
  • Unit 4 Matched filter and correlator detector 21 marks
  • Unit 5 Concept of information theory 17 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. Explain the Gram-Schmidt orthogonalization procedure for transforming linearly independent vectors into orthogonal vectors.

    Asked 4 times: 2025, 2024, 2023, 2022

  2. Discuss the spectral properties of QPSK and MSK.

    Asked 3 times: 2024, 2022

  3. Explain what differential coding / encoding is, how it is achieved, and its advantages and disadvantages.

    Asked 3 times: 2024, 2023, 2022

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