What is coherent communication system?

A coherent communication system is one that uses a reference signal for accurate signal detection and processing, allowing for improved performance in terms of signal-to-noise ratio and data integrity. It typically employs techniques such as phase and frequency synchronization, which help in demodulating the received signal by maintaining phase coherence with the transmitted signal. This type of system is widely used in applications like radar, optical communications, and advanced wireless systems to enhance data transmission efficiency and reliability.