Quadrature Amplitude Modulation (QAM) is widely applied in modern communications systems.The carrier recovery is one of the key factors, which decides the overall performance of the receiver.

• 摘要正交幅度调制(QAM)是现代通信中最为常用的一种调制方法，其载波恢复是决定接收机性能的关键因素之一。