06-02-2013, 03:52 PM
DIGITAL MODULATION USING SIMULINK
[attachment=49869]
1) OBJECTIVE
To understand the basic principles of digitally modulated signals: PAM, PSK, and QAM
To gain experience in using Simulink.
2) PRELAB
Consider a digital communication system that transmits information via QAM over a voice-band telephone channel at a rate of 2400 symbols/second. Assume that the channel is AWGN.
a. Determine the Ɛb / No required to achieve an error probability of 10-5 at 4800 bps.
b. Repeat part (a) for a bit rate of 9600 bps and a bit rate of 19,200 bps.
c. What conclusions do you reach from these results?
BPSK
1. Start a Simulink session. Select File -> New -> Model in the Simulink Library Browser to construct a new model.
2. Go to Communications Blockset -> Comm Sources -> Random Data Sources sub-folder. Drag and drop Random Integer Generator module into the model window. Double-click on this module and make the following settings:
M−ary number to 2
Initial seed to 37
Sample time to 0.1
Output Data Type to double
M-PSK
1. Start a Simulink session. Select File -> New -> Model in the Simulink Library Browser to construct a new model.
2. Go to Communications Blockset -> Comm Sources -> Random Data Sources sub-folder. Drag and drop Random Integer Generator module into the model window. Double-click on this module and make the following settings:
M−ary number to 2
Initial seed to 37
Sample time to 0.1
Output Data Type to double
[attachment=49869]
1) OBJECTIVE
To understand the basic principles of digitally modulated signals: PAM, PSK, and QAM
To gain experience in using Simulink.
2) PRELAB
Consider a digital communication system that transmits information via QAM over a voice-band telephone channel at a rate of 2400 symbols/second. Assume that the channel is AWGN.
a. Determine the Ɛb / No required to achieve an error probability of 10-5 at 4800 bps.
b. Repeat part (a) for a bit rate of 9600 bps and a bit rate of 19,200 bps.
c. What conclusions do you reach from these results?
BPSK
1. Start a Simulink session. Select File -> New -> Model in the Simulink Library Browser to construct a new model.
2. Go to Communications Blockset -> Comm Sources -> Random Data Sources sub-folder. Drag and drop Random Integer Generator module into the model window. Double-click on this module and make the following settings:
M−ary number to 2
Initial seed to 37
Sample time to 0.1
Output Data Type to double
M-PSK
1. Start a Simulink session. Select File -> New -> Model in the Simulink Library Browser to construct a new model.
2. Go to Communications Blockset -> Comm Sources -> Random Data Sources sub-folder. Drag and drop Random Integer Generator module into the model window. Double-click on this module and make the following settings:
M−ary number to 2
Initial seed to 37
Sample time to 0.1
Output Data Type to double