Adaptive equalization device, adaptive equalization method, and communication device

A technology of self-adaptive equalization and communication device, which is applied in gearbox control/balance, optical fiber transmission, transmission system, etc., and can solve the problem of increased power consumption of digital signal processing circuits
CN112840579APending Publication Date: 2021-05-25NTT ELECTORNICS CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NTT ELECTORNICS CORP
Publication Date
2021-05-25

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Abstract

In the present invention, a first compensation section (1) has: a first digital filter (2) for compensating a phase difference between a phase of a symbol in a received signal and sampling timing; and a first filter coefficient calculation unit (4) for calculating a filter coefficient of the first digital filter (2) as a first filter coefficient. A second filter coefficient calculation unit (5) calculates, as a second filter coefficient, a filter coefficient for adaptive equalization by compensating distortion due to temporally fluctuating polarization dispersion on the basis of an output from the first digital filter (2). A coefficient synthesis unit (6) synthesizes the first filter coefficient with the second filter coefficient. A second compensation unit (7) has a second digital filter for simultaneously carrying out the compensation processing of the phase difference between the phase of the symbol in the received signal and the sampling timing and the adaptive equalization processing by using the synthesized filter coefficient from the coefficient synthesis unit (6).
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Description

technical field

[0001] The invention relates to an adaptive equalization device, an adaptive equalization method and a communication device for compensating the characteristics of a transmission path in data communication. Background technique

[0002] In coherent optical communication, a synchronization error with processing timing and distortion of a transmission signal are compensated by digital signal processing on the receiving side, thereby realizing large-capacity transmission of tens of Gbit / s or more. In digital signal processing, in particular, processing such as wavelength dispersion compensation, frequency control and phase adjustment, polarization demultiplexing, and polarization dispersion compensation is performed. The processing of polarization multiplexing separation and polarization dispersion compensation is mainly performed through adaptive equalization. In order to further increase the capacity, it is required to further improve the compensation accurac...

Claims

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