NATIONAL OPEN UNIVERSITY OF NIGERIA
14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2014 EXAMINATION
COURSE CODE: CIT 758
COURSE TITLE: WIRELESS COMMUNICATION II
TIME ALLOWED: 3 HOURS
INSTRUCTION: ANSWER ANY FIVE QUESTIONS.
1(a) What is a Satellite. Explain its principle of operation, stating at least five reasons why it is the most
effective mode of communication.
(b) Outline and explain five essential factors considered in satellite communication, indicating the
various services it is used for.
(c) Enumerate and discuss any three types of satellite orbit, stating at least two advantages and
disadvantages each.
2 (a) Explain the phenomenon Diffraction.
(b) Outline and explain the three (3) effects of electromagnetic wave propagation through the free space.
(c) Enumerate and discuss the various classes of wireless communication.
3 (a) What is Modulation. State at least three types of modulation technique.
(b) Briefly explain the concept of diversity; enumerating at least three important roles it plays in
telecommunication.
(c) Differentiate among these four multiple access techniques; FDMA, TDMA, CDMA and SDMA,
clearly stating the advantage(s) of one over another.
4 (a) Explain the term Wi-fi.
(b) List and explain the basic components of a cellular system.
(c) Outline and discuss at least five significant challenges of RFID.
5 (a) Define the term Bluetooth Profile, enumerating at least ten profiles adopted by Bluetooth SIG.
(b) Outline and discuss any five Bluetooth Specifications.
(c) Discuss the operating principle of RFID, enumerating the various types of Readers and Tags.
6 (a) Explain the IEEE 802.11 standard for WLAN implementation, indicating its various versions.
(b) Using a suitable diagram, explain when a BSS Basic Service Set, becomes an infrastructure.
(c) Using the IEEE 802.11 standard, explain the first two layers of the OSI Model.
7a) What is the meaning GSM.
(b) Outline and discuss the various generations involved in cellular wireless network.
(c) Considering the various generations of the cellular wireless network, under which generation is
the Mobile Computing? Explain.
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