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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

Pending Publication Date: 2021-05-25
NTT ELECTORNICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as the transmission rate increases, the increase in circuit size and power consumption of digital signal processing becomes a problem.

Method used

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  • Adaptive equalization device, adaptive equalization method, and communication device
  • Adaptive equalization device, adaptive equalization method, and communication device
  • Adaptive equalization device, adaptive equalization method, and communication device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] figure 1 It is a diagram showing the adaptive equalization device according to Embodiment 1. The adaptive equalization device is provided on the receiving side of the communication device. The received signal is a data sequence (sampled signal) sampled at a predetermined sampling rate. The sampling rate of the received signal is 1.5 samples / symbol (1.5 s / s), that is, 1.5 samples per 1 symbol. Data for 1 sample is usually represented by a number of bits (for example, 7 bits or 8 bits). A symbol is a unit that forms information bits in a received signal.

[0027] The sampling frequency control / phase adjustment section 1 simultaneously performs phase adjustment for compensating the phase difference between the received signal and the sampling signal (the phase difference between the phase of the symbol of the received signal and the sampling timing) through the same FIR filter 2 Processing, and processing of sampling frequency control (including sampling rate conversio...

Embodiment approach 2

[0055] Figure 4 It is a diagram showing an adaptive equalization device according to Embodiment 2. The basic configuration is the same as that of Embodiment 1, but the processing method of the FIR filter 2 of the sampling frequency control / phase adjustment unit 1 and the FIR filter of the adaptive equalization unit 7 are different. A 1 / 2 circuit 18 is provided instead of the 1 / 6 circuit 17 .

[0056] In Embodiment 1, the received signal of 1.5 s / s is interpolated once by the ×4 circuit 15 and filtered by the FIR filter 2 of the sampling frequency control / phase adjustment unit 1, and then passed by the 1 / 3 circuit 16 And get 2s / s signal. However, in this embodiment, the processing of ×4 / 3 is simultaneously performed on the 1.5 s / s received signal in the FIR filter 2 of the sampling frequency control / phase adjustment unit 1 and the FIR filter of the adaptive equalization unit 7 . Specifically, in the convolution processing in the FIR filter, only data calculated by the proce...

Embodiment approach 3

[0059] Figure 5It is a diagram showing an adaptive equalization device according to Embodiment 3. The basic structure is the same as that of Embodiment 1, but the form of sampling rate conversion is different. A received signal with a sampling rate of 4 / 3s / s is supplied. The sampling rate of the received signal is converted from 4 / 3 s / s to 4 s / s via the ×3 times circuit 19 .

[0060] In the sampling frequency control / phase adjustment unit 1, the reception signal converted to 4 s / s is subjected to sampling frequency control and phase adjustment processing by the FIR filter 2. The processed signal is converted to a sampling rate of 2s / s via the 1 / 2 circuit 20 . The phase synchronization unit 3 calculates an outer loop value corresponding to the frequency error and an inner loop value corresponding to the phase difference from the output signal, and feeds them back to the sampling frequency control / phase adjustment unit 1 . The first filter coefficient calculation unit 4 of ...

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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).

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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Application Information

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IPC IPC(8): H04B10/2507H04B3/06H04B10/61
CPCH04B3/06H04B10/616H04B10/2569H04B10/615H04B10/6162H04B10/2507
Inventor 高椋智大吉田光辉竹谷勉武井和人大山胜一仙北智晴
Owner NTT ELECTORNICS CORP
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