B.TechSemester 62022-23Digital CommunicationKEC-601

Digital Communication (KEC-601) - AKTU Question Paper 2022-23

B.Tech · Semester 6 · Free PDF Download

This is the official AKTU Digital Communication Previous Year Question Paper for B.Tech Semester 6, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 6

Session:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Digital Communication (KEC-601) — extracted question text

Section AAttempt all questions in brief. 2 x 10 = 20

a
In an experiment, a dice are thrown twice in succe ssion. Determine the probability of outcome that sum of outcome in the dice is 7
b
Define the term mean and variance
c
Sketch the block diagram of Digital Communication
d
Discuss EYE diagram in brief
e
Explain the advantages of P SK modulation technique over ASK modulation
f
Compare the bandwidth requirement of ASK, PSK and FSK modulation
g
Describe PN sequence
h
Discuss disadvantages of non-coherent FSK. i. Describe that the mutual information is symmetric in nature. j. Explain the properties of cyclic code

Section BAttempt any three of the following: 10x3=30

a
Explain the properties of a random variable
b
Describe the term Gram -Schmidt orthogonalization scheme
c
Demonstrate ASK modulation and demodulation tech nique
d
With the help of block diagram explain DSSS
e
Describe the term Mutual Information and Entropy

Section CAttempt any one part of the following: 10x1=10

a
Demonstrate Random process, it's classification and properties
b
Describe the following terms: (i) Power spectral density (ii) Autocorrelation function (iii) Gaussian Random Process
a
Illustrate the term ISI. Also explain the method to overcome ISI
b
Describe the properties of Line coding. Also der ive power spectral density of polar signaling
a
Illustrate the modulation and demodulation process of QPSK. Also draw constellation diagram of 4-PSK
b
Explain the FSK modulation and demodulation in detail
a
Derive the relation for Signal-to-Noise ratio of a Matched filter
b
Illustrate the main objective behind spreading o f the signal in communication system. Also describe the principle of DSSS and FHSS communication
a
A memoryless source emits six messages with probabi lity 0.3, 0.25, 0.15, 0.12, 0.1 and 0.08. (i) Find the binary Huffman code (ii) Determine its average word length (iii) The efficiency (iv) Redundancy
b
For a given generator polynomial (i) Find the generator matrix G for a systematic (7,4) cyclic code. (ii) Find the systematic code for message bits 1010

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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