Modulationer
Modulation is the process of altering a carrier signal to encode information for transmission over a communication channel. By changing properties such as amplitude, frequency, or phase, modulation enables efficient use of bandwidth, long-distance transmission, and multiplexing of signals. Modulation methods are typically categorized as analog or digital, and as linear or nonlinear with respect to the carrier.
Analog modulation includes amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). AM varies the
Digital modulation maps digital data to symbols on a carrier. Common schemes include amplitude-shift keying (ASK),
Practical considerations and demodulation: The choice affects bandwidth, power efficiency, and noise robustness. Demodulation can be
History and impact: Modulation theory emerged in the early 20th century with developments in radio communication