ITC513 - Wireless Networking Concepts - Assignment Answers

The subject covers the following topics. Detailed information about each topic and related

learning activities is given below in the schedule.

Topic 1: Introduction to wireless communications

Topic 2: Wireless data transmission

Topic 3: Radio frequency communication

Topic 4: Wireless channel and propagation

Topic 5: Role of antennas in wireless communication

Topic 6: Cellular networks

Topic 7: Capacity of wireless channels

Topic 8: Wireless links

Topic 9: Wi-Fi and WLANs

Topic 10: Emerging wireless technologies

Quiz

Value: 10%

Submission method options: Alternative submission method

TASK

Overview

This task has two practical questions, each question worth 3% of marks. These questions are to test your understanding of the contents in topics 1, 2 and 3.

Q 1: Complete Project 1-4

Deliverable: List two security concerns and security options available, and briefly explain. Your explanation of each security concern and security option should not exceed more than three short sentences. Your total answer for this question should not ex

Q 2: In this question you are required to use GNU Octave. Sinusoidal (sine) waves are commonly used in wireless communication to represent the signal that needs to be transmitted over the wireless channel. For example, in various modulation techniques. A sinusoidal wave can be mathematically represented as y = Asin(2*π* f * t) where

A, π, f, t represent amplitude, a constant pi, frequency (Hz) and time (seconds) respectively.

Using GNU Octave, plot two sine waves (y1 , y2 ) on the same plot (hint: use subplot command) with A = 2, π = 3.14, f1 = 3Hz, f2 = 2f1 , t = 0:50(value of t goes from zero to fifty). Label x and y axis of each plot with 'Time (sec)' and 'Amplitude' respectively. Give title of the plot as 'Name = your name , SID = your student ID'.

Deliverable: You are required to submit your executable Octave code in a text file and figure showing both plots. Submit only one file including code and figure.

Task 2 (4%): Multiple Choice Quiz

• Quiz will be from contents of topic 1, 2 and 3

• There will be total of 20 multiple choice questions in the quiz

• Quiz will be available in forth week of study through subject i2 site. An announcement on i2 site will be made about the quiz start and end dates.

• This will be a single attempt and timed quiz of 1 hour duration. You must complete the quiz to the final submission once you start the quiz.

• Make sure you are ready, well prepared and have stable Internet connection and have enough time before the start of the quiz.

RATIONALE

This assessment task will assess the following learning outcome/s:

• be able to critically analyse wireless networking concepts and their applications in real life situations.

• be able to analyse and describe wireless signalling techniques and radio frequency communications.

• be able to investigate theoretical and practical issues relating to wireless technology and communicate the results to specialist and non-specialist audiences.

Value: 20%

Due Date: 03-May-2020

Return Date: 25-May-2020

Submission method options: Alternative submission method

TASK

This assignment has three components; there are two task 1 and task that you need to complete and submit via Turnitin. There will be a viva type questions answer with your lecturer face to face in the class. This part will carry 5% weightage of the assignment

Task 1: Free Space Propagation and Path Loss (7%)

In a free space wireless propagation environment, transmit power between a transmitter and receiver usually decreases due to free space path loss denoted as Lf (dB) and can be expressed as a function of distance d between transmitter and receiver. Your task is calculate and plot the path loss Lf (dB) for a distance d = 0 to 20km and carrier frequency f c = 100, 300 and 1000 MHz. Assuming that the transmit power Pt is 50 watts, you can calculate and plot the received power Pr as a function of distance d (as given above) for the carrier frequencies given above. You can assume transmit and receive antennas gains are the same, i.e. Gt = Gr = 0 dB . Deliverable: You are required to plot path loss Lf (dB) as a function of distance for each carrier frequency, so you will have three curves in the plot. You also need to plot received power Pr as a function of distance d for each carrier frequency, so you will have three curves of the received power. You need to submit your executable GNU Octave code along with the plots in a single Word file.

Task 2: Research Project (8%)

1. You are working as Network Design Engineer with local service provider and your manager has asked you to propose the design for the below cellular architecture shown in Figure 1. In your design provide the following information with reasons;

Base station sites locations, Antenna specification (such as antenna shape, height, gains etc), mention the type of the area considering the cell size (such as suburban, metropolitan, rural etc) and justify you design. Note that the numbers within each cell are representing the traffic density in Erlang. (6 marks)

2. Looking at the Figure 1 below, justify the design of this cellular network with appropriate reasoning? (2 marks)

Figure 1: Cellular Architecture

Task 3: Face to Face viva questions (5%)

Your lecturer will take viva from Task 1 and Task 2 in the class after the due date of the assignment. Viva's will be be conducted between 27th April to 8th May, please make an appointment with your lecturer. If you fail to give the viva between the above mentioned dates you may get zero mark for Task 3.

RATIONALE

This assessment task will assess the following learning outcome/s:

• be able to critically analyse wireless networking concepts and their applications in real life situations.

• be able to analyse and describe wireless signalling techniques and radio frequency communications.

• be able to compare and contrast different wireless networks in terms of size, speed, limitations and applications.

Value: 20%

Due Date: 24-May-2020

Return Date: 16-Jun-2020

Submission method options: Alternative submission method

TASK

Task 1: Microwave Link Budget Design (10%)

Microwave communication is commonly used as a backbone transmission system in wireless communication networks. As a wireless network engineer, you are often required to perform link budget calculations for such Microwave links. One such link is shown below in Figure 1 which operates in the 12 GHz radio frequency band. This link provides 4 Mbps transmission capacity at both transmitter and receiver sides. Furthermore, the system deploys a passive repeater. Following table shows numerical values for this transmission system.

Transmitter

RF Output Power – High

Power Version:

+20 dBm At Transmission port

Tx RF Branching loss 2 dB From Transmitter to antenna Receiver

Rx RF Branching loss 2 dB From Antenna to Receiver

Antenna Parameters

Antenna diameter= 0.5 m Gt = Gr = 35dBi

Antenna diameter= 1.2 m G subscript t space

equals space G

subscript r space

equals space 45

Figure 1: Microwave Link Configuration

1. Calculate the nominal Receive Signal Level (RSL) at the input of the receiver in dBm assuming free space conditions. (7 marks)

2. Briefly discuss the purpose of the passive repeater in this system? (3 marks)

Task 2: Innovative Research Project (10%)- Group Work

A local engineering group ask you to present your finding of the most recent advanced wireless technologies such as 5G and millimeter Wave (mmWave) communication, Security in 5G, Internet of Things, smart city, for future generation wireless communication. Research

these technologies in details and pay specific attention to (one of them) and discuss how they are used, their application in real life, their strengths and weakness and security issues. You need to provide at least three recent reference articles to your technology of choice. Also provide an opinion regarding which antenna types will become the dominant players in the future such as you may consider physical antenna structures or antenna related signal processing such as multiple-input multiple-output (MIMO) techniques etc.

Deliverable: You need to provide a report on your selected wireless communication technology. The report should include Abstract, Introduction, Body of the report that may include sections such as real life applications, advantages and challenges, security issues etc

(body of the report vary for each group), conclusion and references. Your report should not be more than four A4 pages long including everything, i.e. from first page to the last page of references. In general, four A4 pages with the font size of 11 may have 2000 words (maximum). The report has 6% of the total task 2 weight-age. You are also required to give a short upto 10 minutes oral presentation during the online meeting or in the class. Your lecturer will schedule time for your oral presentation. Your presentation should have maximum 10-12 slides. The presentation has 4% of the total task 2

Value: 50%

Due Date: Variable Date

Return Date: -

Submission method options: Interact2 Test

TASK

UPDATE to exam based on COVID-19.

Your exam will be a time-limited online exam. The exam will be timetabled as per normal and you will be notified of the time via the exams office. The exam questions will be available from a interact 2 test within your interact 2 site. The test will become active at the time given in your exam timetable. You will then submit your answers in the online test.

The time allocated to complete the exam is 10 minutes reading time + 2 hours writing time + 15 minutes technology allowance. The technology allowance gives you extra time due to dealing with the different medium. You are allowed to give answers for the whole time,

however it is your responsibility to submit on time. Late submissions attract heavy late penalties.

Multiple choice questions will be randomised. [Not applicable for all exams] Text based questions can be typed directly into the test. If you need to include a diagram or something else that is difficult to type, then the question will allow a file upload. [Not applicable for all exams] It is expected that an example version of a test will be available beforehand for you to practice the different question types.

For file upload question types (where they apply): For diagrams you can are encouraged to use online diagram tools like Lucid Chart (https://www.lucidchart.com) or Draw.io (https://app.diagrams.net/) to generate diagrams. Then you can export as an image and upload that file. If you handwrite, you are recommended to use the Genius Scan app on your mobile https://thegrizzlylabs.com/genius-scan to create a file to upload. We recommend that you practice prior to your exam so you are familiar with the process in the exam environment to avoid unnecessary pressure. Your lecturer will give more information about this during revision.

Academic integrity is important (https://www.csu.edu.au/current-students/learningresources/ build-your-skills/academic-integrity). Thus various checks will be used to look for academic misconduct. Written answers will be processed by turnitin to look for similarities to web sources and other students’ submissions. Uploaded files will be compared for similarities. IP addresses will be recorded to detect collusion and impersonation. You may be interviewed to explain why you answered questions in certain ways. Penalties for academic misconduct are severe. Also, people who make money from academic misconduct do resort to blackmail to make more money from their victims.