Abstract
The process of modulation consists of mapping the information onto magnetic medium (a carrier). There are mainly three parameters of the carrier which can be varied to perform the modulation process for mapping the information into changes in either the amplitude, phase, or frequency of the carrier. The result of this modulation process is amplitude, phase, and frequency modulations, respectively. Demodulation is the reverse process of removing the carrier signal to obtain the original signal waveform (and thus the message/information) back.
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Majumdar, A. (2015). Modulation, Detection, and Coding for Free-space Optical (FSO) Communications. In: Advanced Free Space Optics (FSO). Springer Series in Optical Sciences, vol 186. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0918-6_3
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