Wireless Technology BS Computer Science 7 Semester/Term CUI — COMSATS University Islamabad 2018
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this paper consists of 60 marks but now we have 35 marks paper.
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Did you provide the past papers of the science of society uos?
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Paper text
COMSATS University Islamabad, Lahore Campus
1st Sessional Examination - Fall 2018
Course Title: Wireless and Mobile Computing Course Code: CSD344; CSC344 Credit Hours: 3(3,0)
Course Instructor/s: Dr. Muhammad Hasanain Chaudary Programme Name: BS Computer Science
Semester: 7th Batch: FA15-BCS, SP16-BCS Section: A, B, C, D Date: 17 October 2018
Time Allowed: 60 Minutes Maximum Marks: 10
Student's Name: Reg. No.
Important Instructions / Guidelines:
Attempt all questions.
Question 1: What will be the effect of frequency difference, if two objects (transmitter & receiver) are moving
closer to each other or away? If an object is moving with the speed of 140 km/h and carrier frequency is 2.4 GHz
then calculate the frequency difference. Assume that speed of light is 3x10^8 m/s. (1 Mark)
Question 2: A multiplexer combines four 200Kbps channels using a time slot of 2 bits.
(0.5+0.5+0.5+0.5 = 2 Marks)
a. What is the frame rate?
b. What is frame duration?
c. What is output bit rate of the link?
d. What is output bit duration of the link?
Question 3: Two channels, one with a bit rate of 200Kbps and another with 400 kbps are to be multiplexed.
(0.5+0.5+0.5+0.5 = 2 Marks)
a. Describe how it can be achieved.
b. What is the frame rate?
c. What is the frame duration?
d. What is the bit rate of the link?
Question 4: How does multiplexing help to reduce the cost per kbps of transmission facility with an increase in
the data rate? Briefly discuss your answer, with help of a suitable example. (1 Mark)
Question 5: Can a network be wireless, but not mobile? Explain. (1 Mark)
Question 6: How many types of noise an EM signal may encounter? Briefly explain each of them. (1 Mark)
Question 7: Highlight the difference between block code (BC) and space time block code (STBC), explain how
the encoder and decoder of STBC works with help of suitable example. (0.5+0.5=1 Mark)
Question 8: Answer the following questions in detail with help of suitable example (if any).
(0.5+0.5 = 1 Marks)
a. Describe the propagation in terms of Line of Sight.
b. Differentiate between Co-channel interference and Adjacent Channel interference.
