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In this section effects of signal propagation are studied. In the firts part, basic effects of multipath propagation are simulated

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

MATLAB ASSIGNMENT

1 SIGNAL PROPAGATION

In this section effects of signal propagation are studied. In the firts part, basic effects of multipath propagation are simulated using a two ray model. In the second part, signal propagation and reflection in an urban environment is modeled using a ray tracer.

1.1 TWO-RAY MODEL

Open the provided Matlab file TwoRayModel.m and familiarize yourself with the simulation parameters. Run the code. Tasks: Add the figure to your report. Explain the three sections of the two ray model plot using relevant theory. Read the critical distance from the plot and verify by calculating it. (hint: the chapter on the two-ray model in Goldsmith’s book could be useful, found in extra reading)

1.2 RAY TRACING IN URBAN ENVIRONMENT

Open the matlab file OuluRaytrace.m. Instead of using run to run the code, use run and advance to run the code one section at a time.

 

Tasks:

1. Add to your report screenshots of the line-of-sight coverage, non-LOS ray trace and the first line of sight trace.

2. How and why does the received power change when the receiver antenna is in line-of-sight?

3. Is there a significant change in received power with nine reflections enabled? Why? Why not?

 

 

2 MPSK IN AWGN CHANNEL

In this laboratory work, the objectives are to study the performance of BPSK and 8PSK modulated signal in AWGN channel using Simulink model file. The performance metrics in this laboratory work are considered BER (bit error rate) and SER (symbol error rate).

2.1 BPSK IN AWGN CHANNEL

In both tasks, you will use the Matlab Simulink file MPSK_in_AWGN.slx. Double click on the MPSK_in_AWGN to open it. Get yourself familiar (double click on the block) with the communication blocks used in the schematic. The parameter “M” will be set later. Make sure that MPSK_in_AWGN.slx and MPSK_control.m are in the same folder. Open MPSK_control.m, read the code and run it. Copy the table below (or similar) into your report and write down the BER results into the report.

 

 

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