Design the MQAM detector using blocks from the SIMULINK Block Library and
the Communications Blockset.
Test the Detector Design
Test your design using the following procerure:
1
Design a modulator (below) to meet the above specifications except make
the input the four symbol sequence
8 15 1 6
2
Connect the output of your modulator to the the input of your detector.
3
Set the simulation parameters as follows:
Start Time: Stop Time: Solver options
Fixed step size:
0.0 (17+4)*8 Type: Fixed-step discrete (no continuous states) 1
4
Run the simulation.
5
The detector produces 22 symbol estimates. The last 4 are valid. Do the last four detector
outputs agree with the input sequence (8 15 1 6)?
Exercise
1
Replace the modulator with the From File block and set the Filename to qam16data.mat
2
Set the simulation parameters as follows:
Start Time: Stop Time: Solver options
Fixed step size:
0.0 (16+1+49)*8 Type: Fixed-step discrete (no continuous states) 1
3
Run the simulation.
4
The detector produces 67 symbol estimates.
49 of these estimates correspond to 28 7-bit ASCII characters.
Determine the message using either your matlab script or the on-line ASCII table.
5
Email your answer to ee485ta "at" byu.edu Attach to your email message, the simulink model file (.mdl) that contains your detector
design.
6
Plot the eye diagram and signal space projections. You may either attach the plots to your email
message (preferred method) or turn in the plots at the beginning of the next class period.