US 11,967,996 B2
Frequency domain equalization method, equalizer, optical receiver, and system
Jilong Han, Wuhan (CN); and Liangchuan Li, Dongguan (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jun. 17, 2022, as Appl. No. 17/843,335.
Application 17/843,335 is a continuation of application No. PCT/CN2020/134114, filed on Dec. 5, 2020.
Claims priority of application No. 201911324461.3 (CN), filed on Dec. 20, 2019.
Prior Publication US 2022/0321232 A1, Oct. 6, 2022
Int. Cl. H04B 10/69 (2013.01); H04L 25/03 (2006.01)
CPC H04B 10/6971 (2013.01) [H04L 25/03159 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A frequency domain equalization method, wherein the method comprises:
receiving at least two channels of digital electrical signals;
randomly selecting two channels of mutually independent digital electrical signals from the at least two channels of the digital electrical signals;
obtaining a first complex signal, wherein the first complex signal is a first time domain signal, and the first complex signal is obtained based on the two channels of mutually independent digital electrical signals;
converting the first complex signal into a frequency domain signal;
multiplying the first complex signal in frequency domain by a tap coefficient to obtain a second complex signal, wherein the tap coefficient is used to implement signal compensation for the first complex signal in frequency domain;
converting the second complex signal into a second time domain signal;
dividing the second time domain signal into two channels of real signals; and
outputting the two channels of real signals.