What is psk what does it mean?

Phase-Shift Keying (PSK)

Phase-Shift Keying (PSK) is a digital modulation technique in which the phase of the carrier signal is varied to represent data. The frequency and amplitude of the carrier signal remain constant, while the phase is altered according to the data being transmitted. PSK is a form of angle modulation.

Here's a breakdown:

• How it Works: Data bits are grouped and assigned to specific phase shifts. For instance, in Binary Phase-Shift Keying (BPSK), a '0' might be represented by a 0-degree phase shift and a '1' by a 180-degree phase shift.

• Types of PSK:

  • BPSK (Binary Phase-Shift Keying): Uses two phase states to represent data (0 and 1). The simplest form of PSK.
  • QPSK (Quadrature Phase-Shift Keying): Uses four phase states (e.g., 0, 90, 180, 270 degrees) to represent two bits of data per symbol. This doubles the data rate compared to BPSK for the same bandwidth. This is a type of M-ary modulation.
  • 8-PSK (Octal Phase-Shift Keying): Uses eight phase states, encoding three bits per symbol.
  • 16-PSK: Uses sixteen phase states, encoding four bits per symbol, and so on. Higher-order PSK schemes allow for increased data rates but are more susceptible to noise and require higher signal-to-noise ratios.

• Advantages: PSK is a robust modulation technique that offers good bandwidth efficiency compared to some other modulation schemes like Frequency-Shift Keying (FSK).

• Disadvantages: Higher-order PSK schemes (like 16-PSK) require more sophisticated demodulation techniques and are more vulnerable to noise and interference.

• Applications: PSK is widely used in various communication systems, including wireless networks (Wi-Fi), satellite communication, and data transmission over telephone lines (modems). PSK modulation is also used in Bluetooth.