COMPLEXITY REDUCED FEED FORWARD CARRIER RECOVERY METHODS FOR M-QAM MODULATION FORMATS

摘要

The present disclosure provides a method of carrier phase error removal associated with an optical communication signal. The method includes estimating and removing a first phase angle associated with an information signal using coarse phase recovery, the information symbol being associated with a digital signal, the digital signal representing the optical communication signal; estimating a carrier frequency offset between a receiver light source and a transmitter light source by using the estimated first phase angle, the carrier frequency offset being associated with the information signal; removing carrier phase error associated with the carrier frequency offset; and estimating and removing a second phase angle associated with the information signal, the estimated second phase angle being based on the estimated first phase angle and the estimated carrier frequency offset.

主权项

1. A method of carrier phase error removal, the method comprising:
removing, using a coarse phase recovery device, a first phase angle associated with an information symbol to provide a coarse phase recovered signal, the information symbol being associated with a digital signal, the digital signal being an optical high-order communication signal; removing a carrier frequency offset by using the first phase angle to provide a carrier frequency offset removed signal, the carrier frequency offset being associated with a current information symbol; removing carrier phase error associated with the carrier frequency offset; and removing, using the coarse phase recovered signal and the carrier frequency offset removed signal, a second phase angle associated with the optical high-order communication signal modulated with the current information symbol to provide a refined phase recovered signal, the second phase angle being removed by performing a maximum likelihood carrier phase estimation.