Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2016-17 EEC801 Wireless And Mobile Communication Question Paper
B.TECH.
THEORY EXAMINATION (SEM?VIII) 2016-17
WIRELESS & MOBILE COMMUNICATION
Time : 3 Hours Max. Marks : 100
Note : Be precise in your answer. In case Ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Attempt the following: 10 x 2 = 20
(3) Find the far field distance for antenna with maximum dimension of 1 In and operating
frequency of 900 MHZ.
(b) Write the range of frequency for GSM 900 and GSM 1800.
(c) Define Brewster angle. Calculate Brewster angle for a sine wave impinging on the
ground having a permittivity of 8:4.
(d) Compare the second generation mobile communication systems in terms of multiple
access technology, modulation technique and channel bandwidth.
(e) What is the need of equalization in communication?
(f) How call termination can be avoided during handoff?
(g) Write short notes on FDD and TDD.
(h) Why hexagonal cells are preferred over Other shapes in Cellular system?
(i) Write different applications of Mobile ad-hoc network.
(j) Discuss the function of VLR and HLR.
SECTION ? B
2. Attempt any five of the following questions: 5 x 10 = 50
(3) Explain the evolution of mobile radio communication.
(b) (i) Discuss survey of equalization techniques.
(ii) Classify and explain diversity techniques used in wireless communications
(c) Discuss the adj acent channel interference. How capacity improvement is achieved
using cell splitting approach?
(d) Given a cellular system with a total bandwidth of 30 MHZ which uses two 25 kHz
simplex channels to provide full duplex voice channels and control channels. Assuming
that system uses a nine cell reuse pattern and lMHz of total bandwidth is allowed for
control channel:
(i) Calculate the total available channels.
(ii) Determine the number of control channels.
(iii) Determine the number of voice channels
(iv) Discuss the strategies for distribution of control and voice in each cell.
(e) How does CDMA technology work in principle? Give detailed features of GSM and
CDMA mobile standards.
(f) What is handoff? Explain Queuing concept in hand Off. What are advantages of delayed
handoff?
(g) What are the main characteristics of IMT?2000 standard? Explain the 4G system and its
applications.
(h) Derive an expression for selection diversity improvement in terms of probability of
receiving signal using single branch or using M branches.
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Attempt any two of the following questions: 2 x 15 = 30
3
Derive power received in free space propagation model. A unit gain antenna with a
maximum dimension of 1m produces 50 W power at 900 MHZ. Find (i) the transmit
power in dBm and dB, (ii) the received power at a free space distance of 5 In and 100
m.
Draw and explain GSM frame structure. Also explain the interfaces used in GSM
system.
Explain following:
(i) Umbrella cell approach (ii) RAKE Receiver
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This post was last modified on 30 January 2020