Method and system for pilot-based time domain phase noise mitigation for coherent receiver

摘要

A method for phase noise mitigation for a coherent receiver in either an OFDM or single carrier based transmission system including applying a frequency offset and coarse phase noise compensation based on a radio frequency RF tone or using a phase lock loop PLL m-th power procedure, responsive to a signal from a digital signal processed transmission with an added pilots signal over an optical system, applying fine phase noise compensation based on comparison of the pilots signal in a time domain, removing the pilots, and demodulating the remaining pilotless signal.

主权项

1. A method for phase noise mitigation for a coherent receiver in either an OFDM or single carrier based transmission system comprising the steps of:
applying a frequency offset and coarse phase noise compensation based on a radio frequency RF tone or using a phase lock loop PLL m-th power procedure, responsive to a received signal from a digital signal processed transmission with an added pilots signal over an optical system, applying a fine phase noise compensation to the received signal based on comparison of the pilots signal in a time domain by:
splitting the received signal into packets, each packet having a length L and overlap length M at a packet beginning,passing each packet through a multi-band filter to filter out the pilot signals, wherein the overlap length M is at least equal to a filter length,comparing the received pilot signals and the original transmitted added pilot signals in the time domain to determine the phase difference sequence having the length L, andmultiplying of a conjugate of the phase difference sequence to the received signal having the length L in the time domain; removing the pilots from the fine phase noise compensated received signal; and demodulating the remaining pilotless signal.