Carrier recovery in digital communication

1. What is carrier recovery in digital communication?
2. What is carrier recovery in digital modulation?
3. What is carrier phase recovery?
4. How synchronization and carrier recovery is important in digital modulation?

What is carrier recovery in digital communication?

A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrier wave and the receiver's local oscillator for the purpose of coherent demodulation.

What is carrier recovery in digital modulation?

Carrier recovery refers to establishing a local carrier reference signal which accurately reproduces the frequency and, with some modulation methods, the phase of the carrier of the modulated signal.

What is carrier phase recovery?

Carrier phase recovery (CPR) is an indispensible function in such coherent receivers, in which the random phase shifts induced by laser phase noise at both transmitter and receiver sides need to be compensated.

How synchronization and carrier recovery is important in digital modulation?

Carrier synchronization is one of the key components in digital communication systems. Briefly, carrier synchronization concerns the estimation and compensation of the carrier frequency and phase differences between the transmitted signal and the corresponding received signal.