Butterfly filter coefficient setting method and device, receiver and receiving method

摘要

The present invention relates to a butterfly filter coefficient setting method and device, a receiver, and a receiving method. The receiver is a DP-CO-OFDM receiver, comprising: a phase recovery device configured to perform a phase recovery of a received signal one OFDM symbol by one OFDM symbol, so as to obtain a phase-recovered first polarization signal and a phase-recovered second polarization signal; a butterfly filter configured to perform butterfly filtration of the phase-recovered first polarization signal and the phase-recovered second polarization signal one OFDM symbol by one OFDM symbol, so as to obtain a butterfly-filtered first polarization signal and a butterfly-filtered second polarization signal; a coefficient setting unit configured to set a filter coefficient used by the butterfly filter for the current OFDM symbol; and a data recovery device configured to recover data from the butterfly-filtered first polarization signal and the butterfly-filtered second polarization signal.

主权项

1. A dual polarization coherent optical orthogonal frequency division multiplexing (DP-CO-OFDM) receiver, comprising:
a phase recovery device, configured to perform a phase recovery of a received signal one OFDM symbol by one OFDM symbol, so as to obtain a phase-recovered first polarization signal and a phase-recovered second polarization signal; a coefficient setting unit, configured to set a filter coefficient for the current OFDM symbol; a butterfly filter, configured to perform butterfly filtration of the phase-recovered first polarization signal and the phase-recovered second polarization signal one OFDM symbol by one OFDM symbol based on the filter coefficient, so as to obtain a butterfly-filtered first polarization signal and a butterfly-filtered second polarization signal; and a data recovery device, configured to recover data from the butterfly-filtered first polarization signal and the butterfly-filtered second polarization signal wherein the coefficient setting unit comprises: a receiving end data matrix construction unit, configured to construct a receiving end data matrix having the number of columns twice of the number of taps of the butterfly filter, based on data in first and second polarization directions carried on a plurality of sub-carriers of respective OFDM symbols of the receiving end after the phase recovery; a training data vector acquisition unit, configured to determine the data in the first and second polarization directions transmitted by a transmitting end on sub-carriers corresponding to respective rows of the receiving end data matrix, and construct training data vectors in the first and second polarization directions corresponding to the receiving end data matrix by using the determined data in the first and second polarization directions; and a coefficient calculation unit, configured to determine a filter coefficient according to the receiving end data matrix and the training data vectors.