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University of Barishal

Department of Computer Science and Engineering

1st Mid Exam

Course Title: Data Communication (CSE-2205)

Semester: 4th | Session: 17-18

Time: 75 minutes | Marks: 30.00

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(Answer any 3 questions)

1.

a)

Define constellation diagram and explain its role in analog transmission.

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2 Marks
b)

Briefly describe four digital to analog conversion techniques (ASK, FSK, PSK, QAM). Also identify which technique is the most susceptible to noise with your own thought.

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6 Marks
c)

Describe the goals of multiplexing.

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2 Marks
2.

a)

Why spread spectrum is used in communication? Explain the bandwidth spreading achievement operation of FHSS in details.

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Topics: Spread Spectrum Techniques (FHSS & DSSS) Solution is Coming!
4 Marks
b)

Write down the basic characteristics of three main multiplexing techniques including its real application scenarios.

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6 Marks
3.

a)

Distinguish between multilevel TDM, multiple slot TDM and pulse stuffed TDM.
 

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3 Marks
b)

Which of the three multiplexing techniques is (are) used to combine analog signals and digital signals.

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3 Marks
c)

An FHSS system uses a 4 bit PN sequence. If the bit rate of PN is 64 bits per second, answer the following questions:

  (a) What is the total number of possible channels?
  (b) What is the time needed to finish a complete cycle of PN.

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4 Marks
4.

a)

Briefly describe the minimum Hamming distance and checksum concept with example.

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4 Marks
b)

Differentiate between single bit error and burst error.

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2 Marks
c)

Describe Cyclic Redundancy Check (CRC) with CRC encoder and decoder block diagram.

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4 Marks
View 206 Topic-wise Questions for this Course

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Uploaded By: Onebyzero Edu (Test User) Aug. 17, 2024, 12:56 p.m.
Converted By (Img/PDF to Text): Baishakhi Bir Nov. 29, 2025, 12:22 a.m.
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