Patent ID: 9654211
Date: 2017-05-16
CPC Classifications: H04B

Claim:
1. An estimation apparatus for nonlinear distortion, configured in a receiving device of a communication system, the estimation apparatus comprising: a digital signal processor, the digital signal processor is configured to; sample a band-limited analog signal to obtain a sampling sequence; calculate a nonlinear perturbation coefficient in a nonlinear distortion estimation based on a Nyquist pulse; calculate a nonlinear perturbation term superimposed on a signal by using the nonlinear perturbation coefficient and the sampling sequence; and calculate a nonlinear distortion waveform by using the nonlinear perturbation term; wherein the processor is further configured to; perform integral processing on a nonlinear perturbation coefficient of each optical fiber span based on link parameters; perform large dispersion approximation on the integral processed nonlinear perturbation coefficient; simplify the large dispersion approximated nonlinear perturbation coefficient by using the Nyquist pulse, so as to obtain a nonlinear perturbation coefficient of each optical fiber span in a form of a single integral; and sum up respectively obtained nonlinear perturbation coefficients of different optical fiber spans, so as to obtain a nonlinear perturbation coefficient of a whole transmission link in a form of a single integral.