Answer the following questions:
1. Analyse how digital convergence affects people’s use of network devices? [4 marks]
2. Compare and contrast DSSS and FHSS. Which one is more suitable than the other, and for what scenario? [5 marks]
3. Research on the standard 802.15.4 and identify its MAC layer responsibilities. [4 marks]
4. According to the Shannon’s Channel capacity theorem:
Channel capacity C = B*log (1 + S/N), Where B = Bandwidth and S/N = Signal to Noise Ratio.
Answer the following questions with respect to the Channel capacity theorem: [6 marks]
a. When the Bandwidth increases, what happens?
b. When the Signal to Noise Ratio increases, what happens?
c. When the Signal to Noise Ration S/N tends to infinity what happens?
d. When the Bandwidth tends to infinity what happens?
5. Scrutinize the following scenario: [5 marks]
Consider a communications system operating in the 5.9 GHz band. Assuming the free space loss model for signal attenuation, the gain of both transmitting and receiving antenna to be 1 dB, and a noise level of -85 dBm, calculate:
a. The range of communication if the transmission power is 100mW;
b. The transmission power if you wanted a communication range of 3 Km;
6. In the questions below, please provide True or False for the statements; justify your answer with proper argument(s). (No marks for not giving the justification) [6 marks]
a. Data throughput is the same as modulation rate of the signal.
b. Frequency Diversity is achieved by spreading the signal in time by sending multiple copies of the signal at different time instants.
c. Multipath propagation always improves the SNR.
Rationale
This assessment task will assess the following learning outcome/s:
- be able to describe wireless networking concepts and their application to real life situations.
- be able to illustrate wireless signalling techniques and describe radio frequency communications.
- be able to investigate and evaluate various wireless networking techniques, protocols and standards.
- be able to compare and contrast different wireless networks in terms of size, speed, limitations and applications.
Marking criteria and standards
|
Question |
HD (85%-10%) |
DI (75% – 84%) |
CR (65% – 74%) |
PS (50% – 64%) |
|
Q 1 – Q 3 |
The answer is correct and complete. A comprehensive explanation is provided with an appropriate example. Figures (if appropriate) were used and. Appropriate reference style is used. No grammatical or spelling mistake. | The answer is correct, and a detailed explanation is provided. References are used. No/only a few grammatical or spelling mistakes. | The answer is correct, but the explanation is not complete. Very few references are used and not formatted appropriately. | The answer is correct but not complete, and only adequate explanation is provided. No references are used. There are grammatical errors and spelling mistakes. |
|
Q 4 and Q 6 |
The answer is correct and complete. All possibilities were considered using appropriate assumptions. A comprehensive explanation is provided with an appropriate example. No grammatical or spelling mistake. | Answers were correct; detailed explanation was given with the omission of few possibilities and assumptions. | Answers are correct; adequate explanations were provided. | Answers are partly correct. Only considered from one point of view. |
|
Q 5 |
Both answers are correct with appropriate assumptions. Show detailed workout. | At least two answers are correct. | At least two answers are correct, but lack of explanation of assumptions | At least one answer is correct |
Presentation
Please write the answers in a word documentand submit it via Turnitin. Use Times new roman/Palatino Linotype/Calibri/Cambria/Arial fonts using 12 font size.
Your answers to the questions should be precise but complete and informative. Below is a guideline about the expected length of the answers in terms of the number of words:
Question 1 to 3: 300 – 600 words for each question;
Question 4: 100 – 300 words for each part;
Question 5: no restrictions;
Question 6: 50 – 100 words for each part.
APA (Version 6) reference style should be used in the assignment
