Patent ID: 11962344
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. The apparatus according to claim 19, wherein the processor is further configured to:
obtain an association between level amplitudes and noise amounts at consecutive sampling points based on the level amplitude of the sampled electrical signal, the equalization parameter, and the initial noise ratio parameter;
determine a third noise amount associated with the electrical signal at the maximum level and a fourth noise amount associated with the electrical signal at the minimum level based on the association between level amplitudes and noise amounts at consecutive sampling points;
modify the initial noise ratio parameter based on the third noise amount and the fourth noise amount to obtain a modified noise ratio parameter;
obtain a noise enhancement factor based on the equalization parameter,
wherein the noise enhancement factor represent a noise enhancement degree of the equalizer; and

obtain the first noise amount associated with the equalized electrical signal based on the level amplitude of the sampled electrical signal, the modified noise ratio parameter, the noise enhancement factor, and an average optical power,
wherein the average optical power is an average value of optical powers of the sampled electrical signal at different level amplitudes.