FSK – Frequency Shift Keying

FSK is a digital modulation technique that can be used to transmit data over long distances. It is often used in radio and fiber optic communications systems. FSK uses a carrier signal that is shifted between two frequencies to represent binary data. The frequency of the carrier signal is changed according to the bit sequence being transmitted, with a higher frequency representing a 1 and a lower frequency representing a 0.

FSK has several advantages over other digital modulation techniques, including its immunity to noise and its ability to be easily demodulated. FSK can also be used in conjunction with other modulation techniques, such as phase-shift keying (PSK), to increase the data transmission rate.

Despite these advantages, FSK has some disadvantages as well. One major disadvantage is that it requires more bandwidth than some other digital modulation techniques because of the need for two separate carrier signals. Additionally, FSK can suffer from intersymbol interference (ISI) due to the nature of how it encodes data onto an electromagnetic waveform.

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