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CIS049-2 Microwave and Optical Communications - University of Bedfordshire
1A- Microwave communications
Learning outcome 1: Understand and contrast fundamental concepts, terminology and techniques in modern microwave and optical communications
Learning outcome 2: Use appropriate tools to design and analyse microwave and optical communication systems based on real-world problems.
In this assignment you will be asked to work on a case study or a scenario, where you will calculate the basic parameters of a microwave transmission link. You will be required to simulate your design and compare the performance against your design parameters.
- Describe the key parameters used to design an microwave
- Apply suitable simulation/experimental methods to verify the performance of the system, analyse your results against design parameters.
- Present the results of your analysis in a concise manner using tables and figures to support your written an alysis.
- Providing a well-structured written report (circa 1500 words) with all the answers and detailed/explained solutions to each problem.
- Justifying your design using simulation or experimental work
- Providing excellent results and demonstrating excellent analysis of the results
- Comparing your theoretical results and simulation results using a critical discussion
Aim
Study and analysis of the performance of wired and wireless microwave communication systems.
Task
PART A: Wired Communication Link
1. Measure the reflection coefficient (S11) and transmission coefficient (S21) for a standard coaxial cable.
2. Measure the transmission coefficient (S21) for the above set-up using a 10 dB and 20 dB attenuator.
3. Replace the attenuator with a band pass filter and measure the transmission coefficient (S21) response and bandwidth.
Explain the test set-up including labelled photos. Arrange the observed values of S11 and S22 in steps 1-3 in a table and include it in your report. Analyse the results discussing impact of the attenuators and filter on the performance of this wired communications channel.
PART B: Wireless Communication Link
1. Use a pair of monopole antennas and measure their operating frequencies using the Vector Network Analyser (VNA).
2. Connect the two monopole antennas to the two ports of the VNA through two coaxial cables forming a wireless link.
3. Place the antennas in vertical orientation on top of the two tri-pods using polystyrene form and paper tape for the support.
4. Place the antennas at minimum distance (in such a way that they are touching each other with no gap). Note down the transmission coefficient (S21) that represents the path gain.
5. Increase the distance between the two antennas in steps of 10 cm up to a maximum of 1.0 m and record the corresponding path gain results. Plot the path gain as a function of the antenna separation.
6. Place one of the antennas in horizontal orientation while keeping the other in vertical orientation. Measure the path gain values for different separations for this antenna set-up as done in Step 5.
Analyse the results and discuss the effects of antenna polarisation on the link performance.
7. Reconnect the apparatus as shown in Figure 1 and note down the path gain response.
8. Place a metal sheet between the two antennas and take an account of the path gain.
2. Connect the two monopole antennas to the two ports of the VNA through two coaxial cables forming a wireless link.
3. Place the antennas in vertical orientation on top of the two tri-pods using polystyrene form and paper tape for the support.
4. Place the antennas at minimum distance (in such a way that they are touching each other with no gap). Note down the transmission coefficient (S21) that represents the path gain.
5. Increase the distance between the two antennas in steps of 10 cm up to a maximum of 1.0 m and record the corresponding path gain results. Plot the path gain as a function of the antenna separation.
6. Place one of the antennas in horizontal orientation while keeping the other in vertical orientation. Measure the path gain values for different separations for this antenna set-up as done in Step 5.
Analyse the results and discuss the effects of antenna polarisation on the link performance.
7. Reconnect the apparatus as shown in Figure 1 and note down the path gain response.
8. Place a metal sheet between the two antennas and take an account of the path gain.
Write a formal technical report on your findings, and in particular compare and contrast the performance of the link in wired and wireless modes. Your report should contain an abstract, the problem statement, methodology and equipment configuration, results and analysis, and conclusions.
You are required to work individually. A formal report is required for this experiment. This aspect is not group work, so no collaborative or cooperative work of any kind is allowed. If your answers (wording) are same (or mostly same) as someone else's work then you and all others involved will fail the assignment and all involved will be reported for plagiarism.
For each step, note down your results and include these results and any plots from your experiment in the report. The report should not exceed a maximum of 1,500 words. The report should include:
1. Abstract
2. Table of content
3. Introduction and problem definition
4. Study of wired communication link with results, analysis and discussion
5. Study of wireless communication link with results, analysis and discussion
6. Conclusion
7. References (follow IEEE style of referencing)
8. Appendices (if needed)
1B- Optical communications
Learning outcome 1: Understand and contrast fundamental concepts, terminology and techniques in modern microwave and optical communications
Learning outcome 2: Use appropriate tools to design and analyse microwave and optical communication systems based on real-world problems.
TASK
Answer all the questions below and present your answers in a clear and concise technical report.
1. A Design an optical communication system operating at a minimum of 50Mb/s. Choose from the following components to design the network.
i. GaAlAs laser diode operating at 50nm and capable of coupling 1mW into a fiber.
ii. Ten sections of optical cable each of which is 500m long and has a 4-dB/km attenuation.
iii. Connector loss of 2dB/connector.
iv. Splice loss of 1dB/splice
v. A pin photodiode receiver with a sensitivity of -45dBm.
vi. An avalanche photodiode receiver with a sensitivity of -56dBm.
a) Show a block diagram of your designed system, justify your selection.
b) Analyse your system using excel to demonstrate that the link budget of the designed system meets the requirements.
c) Plot variation in power with distance from transmitter to receiver.
d) Repeat the optical link design if an inline amplifier with gain of 10 is available. Use link budget to calculate the maximum distance possible.
2. Implement your system designed in Problem 1 using Optisim simulation tools. Discuss necessary assumptions.
a) Explain all the blocks in your system setup, justify your selection.
b) Analyse your system performance using Optisim to demonstrate that system is working satisfactorily.
c) Compare the performance of simulated system with the system designed in Problem 1, analyse the differences.
Attachment:- Microwave and Optical Communications.rar