Phase demodulation is a technique used in communication systems to extract information from a modulated signal. It focuses on detecting changes in the phase of the signal, which can carry data. This method is commonly used in systems like phase-shift keying (PSK), where the phase of a carrier wave is varied to represent different data values. The process involves comparing the phase of the received signal to a reference signal. By analyzing the phase differences, the original information can be recovered. Phase demodulation is essential in various applications, including wireless communication and satellite transmission, ensuring reliable data transfer.