Q.1
14 Marks(a)
Compare baseband versus carrier modulation.
(b)
State and prove the sampling theorem.
(c)
Discuss the QPSK modulation scheme in detail.
Gujarat Technological UniversityWinter 2025 examination
GTU 3151104 Analog and Digital Communication Winter 2025 Question Paper & PDF
B.E. · EC Engineering · Semester 5 · Subject code 3151104
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Enlist the classification of signals. Also, define each category.
(b)
Define FM and PM. Establish the relationship between FM and PM.
(c)
What is aliasing? Discuss the factors responsible for aliasing. Also, discuss possible solutions for it.
OR
(c)
Present analysis of double sideband amplitude modulation. Also, derive sideband and carrier power.
Q.3
14 Marks(a)
Define ISI (inter-symbol interference). Discuss its effects on communication.
(b)
Justify the need for line coding. Enlist various line coding schemes.
(c)
What is quantization? Narrate its importance. Compare linear versus nonlinear quantization.
OR
(a)
Define scrambling. What are the needs of scrambling?
(b)
What is ADPCM? Explain it in brief.
(c)
Explain Differential PCM in detail.
Q.4
14 Marks(a)
Show bandwidth analysis of angle-modulated waves.
(b)
Discuss practical issues in Signal Sampling and reconstruction.
(c)
State and prove Nyquist's criteria for zero ISI.
OR
(a)
What is the superheterodyne concept?
(b)
What is adaptive delta modulation? Describe it in brief.
(c)
Explain equalizers in detail.
Q.5
14 Marks(a)
What is an eye diagram? What is its usage?
(b)
Discuss the FM broadcasting system.
(c)
Write a short note on delta modulation.
OR
(a)
What is a compander? What is its usage?
(b)
Write a short note on the GMSK modulation technique.
(c)
What are preemphasis and deemphasis in FM? Explain them. Justify their needs in FM. Can we use them in AM? Why?
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About this paper
Official Gujarat Technological University (GTU) examination paper for Analog and Digital Communication (Winter 2025, B.E. · EC Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.