PTU Punjab Technical University B-Tech May 2019 Question Papers 6th Semester Electronic and Communication Engineering (ECE)
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ECE)/(ETE) (2011 Onwards) (Sem.?6)
WIRELESS COMMUNICATION SYSTEM
Subject Code : BTEC-602
M.Code : 71122
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
Answer briefly :
a. What is guard space?
b. What are the advantages of cellular system?
c. What is authentication centre?
d. What are bearer services?
e. What is Doppler spread?
f. Which modulation formats are used for high data rate and low data rate in EDGE?
g. How much there is increased in spectrum efficiency offered by 3G compared to 2G?
h. If the cluster size N is reduced while the cell size is kept constant then what is the effect
i. How will you define PN sequences used in CDMA?
j. What is LTE?
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Generalized 4G key challenges and their proposed solutions.
Explain orthogonal covering in CDMA.
Explain the frame structure in GSM along with different burst format.
What are the various physical factors which influence small scale fading?
Write short note on paging system.
With the help of neat block diagram explain forward CDMA channel modulation process.
Consider a cellular system with four cell reuse pattern. Let the bandwidth allocated is 60
MHz to a FDD cellular telephone system using two 30 KHz simplex channels for providing
full duplex control of one channel. Calculate the total number of channels available in one
Compare with tabular format HSCSD, GPRS, EDGE, W-CDMA, IS-95B and CDMA-2000
taking these parameters (1) Channel bandwidth (2) duplexing (3) infrastructure change (4)
required new spectrum (5) required new handsets.
NOTE : Disclosure of identity by writing mobile number or making passing request on any
page of Answer sheet will lead to UMC case against the Student.
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This post was last modified on 04 November 2019