NATIONAL OPEN UNIVERSITY OF NIGERIA
FACULTY OF SCIENCE
CIT 755: WIRELESS COMMUNICATION I [3 Units]
Instruction: Attempt any five questions each question carries 14 marks Time: 3 hours
1(a) Mention four advantages and benefits of wireless technology (6 marks)
1(b) Compare and contrast the wired and wireless communication (5 marks)
1(c) Mention different types of Wireless Communication (3 marks)
2(a) Explain and state the disadvantages of Microcell (4 marks)
2(b) Mention and describe the three basic propagation mechanisms which impact propagation in a mobile communication system (6 marks)
2(c)Explain transmitter diversity with and without channel state information (4 Marks)
3 (a) Define Jamming Margin (4 marks)
3 (b) Explain why Hexagon Geometry are always proffered (4 marks)
3 ( c) Describe the concept of multiuser detection(6 marks)
4(a)Explain in detail about handoff (4 marks)
4(b) Describe the technical challenges to wireless communication (4 marks)
4( c) Discuss causes and effect of multipath propagation in wireless telecommunication(6 marks)
5(a) With the aid of well labelled diagrams, describe three basic techniques for linking customers to fixed channel radio links (9 marks)
5(b) Define Doppler shift (5 marks)
6(a) Differentiate time selective and frequency selective channel. (4 marks)
6(b) List five examples of Wireless Communication devices (5 marks)
6(c) List Advantages and Disadvantages of Wireless Communication(5 marks)
7(a) List the advantages of digital modulation techniques (4 marks)
7(b) Mention the factors that influence the choice of digital modulation (5 marks)
7(c) Define QPSK (5 marks)
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Exam summary sample below
