Phase Modulation (PM) is also known as what?

Phase Modulation (PM) is also known as what?

• A. Phase Shift Keying (PSK)
• B. Amplitude Shift Keying (ASK)
• C. Frequency Shift Keying (FSK)
• D. Quadrature Phase Modulation (QPM)

Answer: (A)

Phase modulation changes the carrier’s phase to carry information. When that phase change is implemented in discrete steps to represent digital data, the technique is called Phase Shift Keying. So Phase Modulation and Phase Shift Keying describe the same idea in different terms, with PSK being the standard label for the digital form of PM. The other options point to encoding information in amplitude or frequency, which are different modulation schemes, and a term like Quadrature Phase Modulation isn’t a standard name (you’ll often hear Quadrature Phase Shift Keying, or QPSK, in practice). In short, PSK directly captures the concept of shifting phase to convey data.

Phase modulation changes the carrier’s phase to carry information. When that phase change is implemented in discrete steps to represent digital data, the technique is called Phase Shift Keying. So Phase Modulation and Phase Shift Keying describe the same idea in different terms, with PSK being the standard label for the digital form of PM. The other options point to encoding information in amplitude or frequency, which are different modulation schemes, and a term like Quadrature Phase Modulation isn’t a standard name (you’ll often hear Quadrature Phase Shift Keying, or QPSK, in practice). In short, PSK directly captures the concept of shifting phase to convey data.