Signal processing apparatus, transmitter, receiver and method

摘要

A signal processing apparatus configured to correct a distortion introduced by a signal processing path into a processed signal comprising a transformer that transforms the processed signal into a transformed signal in frequency domain, a processor that determines a first correction function and a second correction function upon the basis of a transfer function of the signal processing path, a first multiplier that multiplies values of the transformed signal with coefficients of the first correction function to obtain a first corrected signal, a signal reverser that reverses an order of values in a copy of the transformed signal to obtain a reversed transformed signal, a second multiplier that multiplies values of the reversed transformed signal with coefficients of the second correction function to obtain a second corrected signal, and an adder that adds the first corrected signal and the second corrected signal to obtain a corrected output signal.

主权项

1. A signal processing apparatus configured to correct a distortion introduced by a signal processing path into a processed signal, the signal processing apparatus comprising:
a transformer that transforms the processed signal into a transformed signal in frequency domain; a processor that determines a first correction function and a second correction function upon the basis of a transfer function of the signal processing path; a first multiplier that multiplies values of the transformed signal with coefficients of the first correction function to obtain a first corrected signal; a signal reverser that reverses an order of values in a copy of the transformed signal to obtain a reversed transformed signal; a second multiplier that multiplies values of the reversed transformed signal with coefficients of the second correction function to obtain a second corrected signal; and an adder that adds the first corrected signal and the second corrected signal to obtain a corrected output signal, wherein the processor is configured to determine the first correction function C1 and the second correction function C2 for correction upon the basis of the following formula:
C1=½[Hc(I)+Hc(Q)]CD−1 C2=½[Hc(I)−Hc(Q)]CD−1, wherein HC(I) denotes an in-phase part of the transfer function of the signal processing path, wherein HC(Q) denotes a quadrature part of the transfer function, and wherein CD−1 denotes a chromatic dispersion compensation function.