Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem Old 171004 Wireless Communication Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (OLD) EXAMINATION ? SUMMER 2019
Subject Code: 171004 Date: 27/05/2019
Subject Name:Wireless Communication
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full mark0073.
Q.1 (a) Compare 2G, 2.5G, 3G and 4G in brief. 07
(b) Explain frequency reuse concept with suitable figure 07
Q.2 (a) Define following: MAHO, RSSI, Cell Dragging, Coherence BW, Coherence Time.
Cell, Cluster
07
(b)
Prove that the co- channel reuse ratio is given by Q= 3N ,
where N = i
2
+ ij + j
2
(Use cosine law & hexagonal geometry)
07
OR
(b)
Explain the difference between cell splitting and sectoring.
07
Q.3 (a)
Explain Ground reflection (Two Ray) model and find E TOT in terms E-field at the
reference distance d o , Receiver distance and antenna height.
07
(b) Describe the factors influencing and effect of small scale fading.
07
OR
Q.3 (a) Explain Impulse response model of a multipath channel. 07
(b) Explain Diffraction of Radio Signals using Fresnel Zone Geometry. Show
expression for nth Fresnel Zone circle in terms of ?,d1 & d2.
07
Q.4 (a) Explain TDMA technique. What is frame structure of TDMA system? OR Show
how to work out efficiency of TDMA system.
07
(b) Write a S.N. on Zig Bee. 07
OR
Q.4 (a) Write S.N on Rake Receiver. 07
(b) Describe Spread spectrum multiple access technique (FHMA &CDMA) . 07
Q.5 (a) Draw and explain GSM architecture. 07
(b) Explain Security issues and challenges in a Wireless network 07
OR
Q.5 (a) Explain CDMA forward channel. 07
(b) Discuss step by step signal processing in GSM. 07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020