Phase Shift Keying (PSK) is a digital modulation technique used in communication systems to encode information in the phase of a carrier wave. In PSK, the phase of the carrier signal is varied to represent different symbols or bits. The most common forms include Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and higher-order variants like 8-PSK or 16-PSK.
In BPSK, for example, two different phases are used to represent binary 0 and 1. The carrier signal undergoes a 180-degree phase shift for each bit, allowing for the transmission of binary data.
QPSK extends this concept by using four different phase shifts, allowing each symbol to represent two bits of information. This allows for higher data rates compared to BPSK.
Phase Shift Keying is widely used in various communication systems, including satellite communication, digital television broadcasting, and some wireless communication standards. The advantage of PSK lies in its ability to transmit data efficiently by varying the phase of the carrier signal, making it resilient to certain types of noise and interference.