US 12,224,767 B2
Signal processing apparatus for use in optical communication
Artem Vitalyevich Cherenkov, Moscow (RU); Man Zhao, Chengdu (CN); Mikhail Alexandrovich Linnik, Moscow (RU); and Yijie Wang, Chengdu (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed on Feb. 10, 2023, as Appl. No. 18/167,380.
Application 18/167,380 is a continuation of application No. PCT/RU2020/000432, filed on Aug. 13, 2020.
Prior Publication US 2023/0188155 A1, Jun. 15, 2023
Int. Cl. H03M 1/66 (2006.01); H03M 1/06 (2006.01); H03M 1/08 (2006.01)
CPC H03M 1/662 (2013.01) [H03M 1/0624 (2013.01); H03M 1/0854 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A signal processing apparatus, comprising:
a plurality of time-interleaving digital-to-analog converters (sub-DACs), each configured to sample a digital input signal at a preset sub-DAC sample frequency, and to generate an analog sub-DAC output signal;
an analog multiplexer configured to sample the plurality of sub-DAC output signals at a preset multiplexer clock frequency, and to generate a multiplexer output signal;
a local analog-to-digital converter (ADC), configured to receive the multiplexer output signal and generate a digital feedback signal;
a digital compensation engine configured to receive the digital feedback signal from the local ADC and determine one or more distortion compensation parameters based on a comparison of the digital feedback signal with the digital input signal; and
a digital pre-processing stage configured to receive the one or more distortion compensation parameters from the digital compensation engine and perform distortion compensation pre-processing on the digital input signal.