SIGNAL PROCESSING SYSTEM AND METHOD

摘要

A signal processing system is provided by the present invention. The system includes a sampling and pretreatment device, an adaptive equalization filter, a phase discriminator, a loop filter and an oscillation device, which are connected orderly. The output end of said oscillation device is connected with said sampling and pretreatment device. A signal processing system for a coherent optical receiver of an optical Quadrature Phase-Shift Keying (QPSK) system is also provided by the present invention. The system includes a local oscillation laser, a 90 degree mixer, an optoelectronic converter, a sampling and pretreatment device, an adaptive equalization filter, a phase discriminator, a loop filter and an oscillation device, which are connected orderly. The output end of said oscillation device is connected with said sampling and pretreatment device. A signal processing method and a signal processing method for a coherent optical receiver of an optical Quadrature Phase-Shift Keying (QPSK) system are also provided by the present invention. The present invention weakens the influence of signal distortion on phase discrimination and improves the capability for detecting phase error.