Frequency Shift Keying (FSK) & Phase Shift Keying (PSK)

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Chapter 2: Digital Modulation

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Presentation transcript:

Frequency Shift Keying (FSK) & Phase Shift Keying (PSK) Lecture 6: Frequency Shift Keying (FSK) & Phase Shift Keying (PSK) 1nd semester 1438-1439 By: Adal ALashban

Outline - FSK (Frequency Shift Keying). - Digital Modulation (FSK). - PSK (Phase Shift Keying). - Digital Modulation Summary.

FSK (Frequency Shift Keying) - The frequency of the carrier signal is varied to represent binary 1 or 0. - Both peak amplitude and phase remain constant while the frequency changes. - The frequency of the signal during each bit duration is constant, and its value depends on the bit (0 or 1).

Digital Modulation (FSK) - Frequency Shift Keying (FSK): - 0 and 1 represented by different frequencies. - Switch between two oscillators accordingly. - Twice the bandwidth but more resilient to error.

PSK (Phase Shift Keying) - The phase of the carrier signal is varied to represent binary 1 or 0. - Both peak amplitude and frequency remain constant while the phase changes. - The phase of the signal during each bit duration is constant, and its value depends on the bit (0 or 1).

Digital Modulation Summary - Amplitude Shift Keying (ASK): 1- Very simple. 2- Low bandwidth requirements. 3- Very susceptible to interference. - Frequency Shift Keying (FSK): 1- Needs larger bandwidth. 2- More error resilience than AM. - Phase Shift Keying (PSK): 1- More complex. 2- Robust against interference. - Other modulation schemes are mostly complex variants of ASK, FSK, or PSK…

Digital Modulation Summary

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