Which modulation technique is commonly used in digital communication?

Phase Shift Keying (PSK) is a widely used modulation technique in digital communication. PSK encodes data by changing the phase of a carrier signal. This method is particularly advantageous because it allows for efficient transmission of data over noisy channels and is robust against signal degradation.

PSK varies the phase to represent different symbols, making it suitable for various data rates and applications. For instance, Binary Phase Shift Keying (BPSK) represents data with two distinct phases, while more advanced forms like Quadrature Phase Shift Keying (QPSK) can effectively transmit multiple bits of information per symbol by using four different phases.

The effectiveness of PSK in digital communication systems stems from its ability to maintain integrity and reduce error rates, even in challenging conditions. This modulation technique can also be easily implemented in digital circuitry, making it a popular choice for modern communication systems.

In contrast, the other modulation techniques listed have different uses and characteristics. Amplitude Modulation and Frequency Modulation are primarily associated with analog signals, whereas Single Sideband Modulation is a variation of amplitude modulation optimized for improving efficiency in bandwidth usage but isn't typically categorized strictly under digital modulation techniques.