Computer Science Homework Help

A. Encoding and decoding signals

Note: Hand
drawn plots will get 0 marks. You need to embed screenshots of your
plots and include the links generated by sharing your solution from the
Desmos online graph plotting tool (as introduced in the lab and
available at: https://www.desmos.com/calculator). Since group work is
not permitted, we expect each student to submit a different link! You
can access your individualised assignment parameters on Moodle.

1. Modulation – Analog signals

You
need to download your individualized assignment parameters from Moodle.
They contain two sets of encoding tables and encoded signals, A and B. For each of these, do the following:

a) Identify the type of encoding (FM, AM, PM, or combinations of these) and the size (in bits) of each symbol in the encoding.

• b) Draw the constellation diagram for the encoding (except if the encoding is FM).
• c) Draw the wave form for each symbol.
• d) Demodulate the given signal (i.e., give the bit sequence that it represents).

2. Digital encoding

The bit sequence C needs to be transmitted as a digital signal. Design an encoding, state the encoding rules (as a table), and plot the digital signal for the encoding schemes below.

• a) bipolar non return to zero inverted (NRZI)
• b) Manchester encoding

B. Technical Report

Based
on the scenario you find below, you are to write a technical report for
the senior executive of the company you work in, evaluating different
technologies to meet the company’s networking requirements.

The
rest of this specification is organised into two parts: 1) the scenario,
which explains the situation of the (imaginary) company you work for,
and 2) the instructions how you should approach this task.

1. Scenario

Your role / company overview: You work in the IT department of DataAnalytics.AU,
a start-up company that was spun out of Monash University with around
20 employees in Melbourne. The company is offering data analysis
services, where customers can upload large data sets and access
customised visual analyses through a web site.

Your company is
growing fast, and the plan is to move into new offices within the next
few months. You were hired as a user interface specialist, but when the
CIO (Chief Information Officer) found out that you did FIT9135 as part
of your Master’s degree, she gave you the task to design the network
infrastructure for the new offices.

2

Network requirements:

• Up
  to now, the company was operating its own web server in a Monash data
  centre. The projected growth in customers and staff means that a
  dedicated, more powerful server will be required. The company is
  considering hosting its own servers or paying for an “on- demand
  computing platform” such as Amazon Web Services, DigitalOcean, Linode etc.
• The
  new office space is located in an old warehouse, and you need to decide
  what kind of local network infrastructure should be installed. In
  addition to potentially supporting the company servers, the local
  network infrastructure needs to support a dynamic work environment,
  where staff don’t have assigned offices but move around with their
  laptops to work in small groups.
• The new office space needs to be connected to the Internet.

Your task:

For
the first requirement, your task is to do some research on the
advantages and disadvantages of hosting your own server versus using
online services. The second and third requirements are linked to the
first one. If the company decides to host their own servers, that may
have an impact on the required local network infrastructure and Internet
connection.

Research and analysis expected in the report:

• The
  CIO wants to be informed about the options at a technical level.
  However, they expect you to give them enough arguments to also convince
  their investors, in particular with respect to costs and benefits of any new technology.
• Go
  into some technical detail to explain differences between technologies.
  It will be useful to create tables for some of the comparisons. You can
  answer questions such as

o
Whatdevicesareinvolvedineachoptionandwhataretheirfunctions? o How does
hosting your own servers compare to online platforms in terms of
scalability,

reliability, and up-front versus long-term costs? o
Whatkindof(wiredandwireless)networktechnologyshouldbeinstalledinthenewoffice

space in order to facilitate the mobility of the staff? o What
are the available upstream and downstream capacities of different
Internet

providers? Is the technology scalable and future-proof, i.e., can we buy more capacity later without investing in expensive new hardware?