Download GTU BE/B.Tech 2019 Winter 7th Sem Old 171004 Wireless Communication Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem Old 171004 Wireless Communication Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (Old) EXAMINATION ? WINTER 2019
Subject Code: 171004 Date: 03/12/2019

Subject Name: Wireless Communication
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) Define following: (A)Control Channel (B)GOS (C) MAHO (D)Reverse Channel
(E)Cluster (F)Page (G)FDD
07
(b) Explain the concept of Cell splitting and clustering with figure. 07

Q.2 (a) Differentiate between cell splitting and sectoring. Prove that the co-channel reuse
ratio is given by , where N = i
2
+ ij + j
2

07
(b) With respect to mobile networks, explain co channel and adjacent channel
interference.
07
OR
(b) Explain the three basic propagation mechanisms which impact the propagation
of signal in a mobile environment.
07

Q.3 (a) Compare the S/I ratio for a mobile radio for the following cases of cellular
system with frequency reuse factor of 7 for (i) Omni directional antenna (ii) 120
0

Directional antennas.
07
(b) Derive an expression for the received power for a two-ray reflection point to point
mobile communication propagation model. Assume path loss exponent n=4.
07
OR
Q.3 (a) For a regular cellular structure with equal size hexagonal cells, show that D/R=
(21)
?
, Where D is the minimum distance between the centers of adjacent cells
and R is the radius of each cell. Assume 7-cell reuse pattern.
07
(b) Explain in detail the types of small scale fading (including time delay and
Doppler spread).
07

Q.4 (a) Discuss in detail the signal processing in GSM including speech coding, channel
coding (data & control channels).
07
(b) What is soft handoff? Explain in detail RAKE receiver with neat diagram. 07
OR
Q.4 (a) Explain in detail the impulse response model of a multipath channel. 07
(b) Compare HSCSD and GPRS. Explain briefly GPRS. 07

Q.5 (a) Briefly Describe the functions of the following for GSM Systems.(i) MSC
(ii)VLR (iii)HLR (iv)AUC (v) EIR.
07
(b) Comparison of TDMA and CDMA multiple Access Techniques in detail. 07
OR

Q.5 (a) Discuss in details about architecture of UWB radio and its applications. 07
(b) Describe the wireless Ad-Hoc network with neat diagram. 07

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