EEET1083 - Advanced Mobile and Wireless Systems Engineering - Engineering Assignment Help

Assignment Task

Questions:
Q1) Explain in detail what happens to the spectral graph when choosing the following options for the averaging function, no-averaging, RMS averaging, vector averaging and peakhold. More descriptive explanation than what is provided in the lab guide for Lab-1 is expected.
 

Q2) Identify the noise floor levels for each of the averaging options mentioned in Q1 at the 2G carrier frequency, the noise floor level is the flat level where the spectrum settles at the either ends of the spectral plot.
Noise Floor Levels for each option:-
No Averaging: 120-160dBm
RMS Averaging: 125dBm
Vector Averaging: 130-160dBm
Peak Hold: 120dBm

Q3) Observe the radio spectrum at wide range of frequencies and report your findings. You can take snap shots of the spectra and use it in your reports. Try to find the corresponding transmission that uses the spectra that you observe. (e.g. radio stations, tv stations, etc.). Ask your tutor about the antenna gain characteristics at the frequencies you observe.
 

Q4) Write or copy and paste the Matlab codes that you wrote to generate and plot all the curves in this lab session (such as the codes you used to create the polyfit function, plot commands and createion of the theoretical pathloss curve y=mx+c).

Q5) Copy and paste the Matlab figure on which you had plot the experimental values for the received power and as well as the theoretical (line) curve for the pathloss experiment, during this lab session.
 

Q6) What is the pathloss exponent that you had computed using the experimental values? Explain on the accuracy of this value by referring to the lecture notes on the typical values for the pathloss exponent for indoor environments.

Q7) What is the expected received power at a distance d=100m from your theoretical curve y=mx+c?

Q8) How many signal constellation points are there for (a) QPSK and for (b) 8-PSK

Q9) When your USRP unit operates as a receiver report your observations on how the constellation diagram behaves. 

Q10) When your USRP unit operates as a receiver explain why the signal constellation is not so stable sometimes.

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