TRAINING-AIDED FEEDFORWARD CHANNEL EQUALIZATION

An optical signal (204) modulated with a stream of symbols comprising a sequence of training symbols is received at a receiver (104,200). First equalizer circuitry (242,300) calculates (702) and applies first coefficients (304) to digital signals (240) representative of the optical signal, resulting...

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Bibliographic Details
Main Authors BABAEE, Ramin, ROBERTS, Kim B, BOUCHARD, Martin, OVEIS GHARAN, Shahab
Format Patent
LanguageEnglish
French
German
Published 21.09.2022
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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Summary:An optical signal (204) modulated with a stream of symbols comprising a sequence of training symbols is received at a receiver (104,200). First equalizer circuitry (242,300) calculates (702) and applies first coefficients (304) to digital signals (240) representative of the optical signal, resulting in first compensated signals (244). Second equalizer circuitry (246,500) calculates (704) second coefficients (552) based on a correlation between the first compensated signals and digital signals representative of the sequence of training symbols (506) and applies the second coefficients to the first compensated signals, resulting in second compensated signals (248). Third equalizer circuitry (250,400) calculates (706) and applies third coefficients (404) to the second compensated signals, resulting in third compensated signals (252). The first, second, and third coefficients compensate for impairments varying at respective first, second, and third rates, where the third rate is higher than the first rate and lower than the second rate.
Bibliography:Application Number: EP20210172055