ITNW WIRELESS NETWORKING

Ministry of Higher Education

Sohar College of Applied Sciences

Information Technology Department

A.Y 2019-20 Spring Semester 2020

Assignment # 1

ITNW4104 WIRELESS NETWORKING

Issue Date: 22 April 2020

Student Name: Student ID G Group No.10 Max. Marks: 40

Instructions: 1. Assignment 1 is for 40 marks and worth 40 % of final marks for ITNW4104 Course. 2. Answer all the questions 3. Answer should be handwritten using blue or black pen only. Diagram or figures can be drawn

using pencil.

4. Follow the plagiarism policy as per the academic regulation. 5. Upload the Assignment 1 in Blackboard and try to upload once it is completed at the earliest.

A. Complete the following questions ( 1X10 =10 Marks) 1. Is there any change in the data if guided or unguided media is used for data transmission?

Yes / No. Why_______________________________________________________________

2. Under which frequencies most of the signal energy is contained in it. _____________ Why?_________________________________________________________

3. Which type of fading is mostly occurs in urban setting? ___________________________________________________________________________

4. When will be the attenuation is highest and why?

_____________________________________________________________________________

5. In DSSS if the chip or spreading code is “0010”, the resultant spread data output for the input data “1001” after XOR operations will be ________________.

6. In DSSS one data bit is divided over frequency-hop channels.

TRUE / FALSE. Give reason______________________________________________________

7. Cell sectoring is the good idea to increase the channel capacity. YES / NO. Why? _______________________________________________________________

8. What geometric shape is used in cellular system design? _____________________________________________________________________________________

9. Which type of wireless LAN is appropriate for ad-hoc network. _____________________________________________________________________________________

10. To connect the two buildings Ad hoc network is most suitable.

YES / NO. Justify______________________________________________________________

B. Answer the following questions in brief ( 3X 6 = 18 Marks)

1. Why Signal to Noise Ratio is important? A periodic sine wave with frequencies 100, 300, 500, 700 and 900 Hz. What is the bandwidth of this signal? Represent these frequencies in frequency

domain plot.

2. How many radians are there in complete cycle of signal of 360 0 ? What is the channel capacity for a

teleprinter channel with a 300-Hz bandwidth and a signal-to-noise ratio of 3 dB?

3. What information is available from a radiation pattern of an antenna? Which antenna radiates power in all the direction?

4. A microwave transmitter has an output of 0.1 W at 2 GHz. Assume that this transmitter is used in a microwave communication system where the transmitting and receiving antennas are parabolas, each 1.2 m

in diameter. a. What is the gain of each antenna in decibels? b. Taking into account antenna gain, what is the

effective radiated power of the transmitted signal?

5. As a network administrator propose the wireless network requirement plan for the college network.

6. How is the concept of an association related to that of mobility?

C. Answer the following questions in detail (2X 6 = 12 Marks)

1. a. In the CDMA technique if three users (A, B, and C) with the following codes Code for user A=<1, -1, 1, -1, 1, -1>

Code for user B=<-1, -1, -1, 1, 1, 1>

Code for user C=<1, -1, -1, 1, -1, -1>

are communicating to the base receiver, write the chip pattern when

i. A wants to send 1 ii. B wants to send 0

iii. C wants to send 1 b. What is the relationship between the bit rate of a signal before and after it has been encoded

using DSSS?

2. a. What are the advantages of using CDMA for cellular network? b. What are some key characteristics that distinguish third-generation cellular systems

from second-generation cellular systems?

c. Describe a sequence of events similar to that of the given Figure for i) A call from a mobile unit to a fixed subscriber ii) A call from a fixed subscriber to a mobile unit