Analog Modulation/Demodulation Demonstrator
Thanawat Thiasiriphet, Faculty Of Engineering , Chiang Mai University, Department of Electrical Engineering
Initial Publication Date: November 30, 2021
Summary
The demonstrator is designed to be used as a lab activity to study the basic of analog modulation/demodulation. Variants of amplitude modulation signal, frequency modulation signal and phase modulation signal with sinusoidal message signal can be generated and displayed. Different types of suitable demodulation techniques can be selected. Parameters can be adjusted to see the impact on modulation/demodulation. The expected outcome is to have student become familiar and understand different types of analog modulation/demodulation methods
Topics
Engineering
Grade Level
Graduate/Professional
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Learning Goals
- Students shall understand about the principle of modulating/demodulating with amplitude modulation, frequency modulation, phase modulation.
- Students shall understand the impact and limitation of different parameters on AM,FM and PM signals.
- Using demo developed with MATLAB GUI make it easy to adjust parameters and to display different stages of signals in both time domain and frequency domain
Context for Use
- Bachelor degree, Electrical engineering students.
- Lab with a group of not more than 2 students per working group.
- 2-3 hours with discussion
- No need for technical skills and experience with MATLAB as the software is developed with GUI.
- This activity is an addition activity to lecture courses, e.g. Principle of Communications, Intro to Communication Engineering.
Description and Teaching Materials
Students may choose different parameters and discuss.
Showing that different modulation techniques can be chosen
![[creative commons]](/images/creativecommons_16.png)
Provenance: Thanawat Thaisiriphet, Faculty Of Engineering , Chiang Mai University
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
Showing a good selection of modulation index for AM
Provenance: Thanawat Thaisiriphet, Faculty Of Engineering , Chiang Mai University
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
Showing a bad selection of modulation index for AM
Provenance: Thanawat Thaisiriphet, Faculty Of Engineering , Chiang Mai University
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
Showing FM modulation/demodulation
Provenance: Thanawat Thaisiriphet, Faculty Of Engineering , Chiang Mai University
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
Teaching Notes and Tips
Let the student adjust the parameters, compare the message signal and demodulated signal. Let the student fins the correlation between the transmitted signal for the 'good scenario' and 'bad scenario'
Assessment
Assessment is done via discussion and let students show different scenarios via the given tools.
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