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A method and device for adjusting tap coefficients of an adaptive equalizer

A technology of adaptive equalization and tap coefficients, which is applied in equalizers, shaping networks in transmitters/receivers, transmission systems, etc., can solve the problems that the filtering performance is not as good as that of unadjusted ones, and the filtering performance of adaptive equalizers is reduced, achieving Guaranteed effect of filtering performance

Active Publication Date: 2020-06-16
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the above risks occur, the filtering performance of the adaptive equalizer will be reduced, and even the filtering performance after the adjustment of the center position of the tap coefficient is not as good as the filtering performance before the adjustment

Method used

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  • A method and device for adjusting tap coefficients of an adaptive equalizer
  • A method and device for adjusting tap coefficients of an adaptive equalizer
  • A method and device for adjusting tap coefficients of an adaptive equalizer

Examples

Experimental program
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Effect test

Embodiment 1

[0032] figure 2 It is a flow chart of a method for adjusting tap coefficients of an adaptive equalizer according to an embodiment of the present invention. like figure 2 As shown, the adjustment method provided by the embodiment of the present invention includes the following steps:

[0033] Step 100, obtain the energy of T+1 tap coefficients at each boundary in the tap coefficient queue of the adaptive equalizer, and the sum of the energy of each tap coefficient in the tap coefficient queue, where T is the preset adaptive equalization The adjustment step size of the device tap coefficient, T is a positive integer.

[0034] Step 200: Set corresponding proportional coefficients based on the T+1 tap coefficients at each boundary, and calculate the product of the energy sum and each proportional coefficient.

[0035] Step 300, the energy of each tap coefficient among the T+1 tap coefficients at the first boundary, the sum of the energies of the T tap coefficients at the seco...

Embodiment 2

[0082] On the basis of Embodiment 1, the step size of each adjustment of the tap coefficients of the adaptive equalizer in the embodiment of the present invention is changed to 1 tap number, that is, T=1.

[0083] At this time, the condition that needs to be satisfied for adjusting the center position of the tap coefficient is condition 3 or condition 4, wherein condition 3 is:

[0084] (h3(1)>=sh3·para1||h3(2)>=sh3·para4)&&h3(N)<=sh3·para2&&h3(N-1)<=sh3·para3, where n≥1 and n is less than Equal to N, where N is the number of tap coefficients in the tap coefficient queue.

[0085] Condition 4 is:

[0086] (h3(N)>=sh3·para1||h3(N-1)>=sh3·para4)&&h3(1)<=sh3·para2&&h3(2)<=sh3·para3, where n≥1 and n is less than Equal to N, where N is the number of tap coefficients in the tap coefficient queue.

[0087] In the embodiment of the present invention such as Figure 4 In the adjustment method shown, firstly, it is judged whether condition 3 is satisfied, and if condition 3 is satis...

Embodiment 3

[0090] On the basis of Embodiment 1, the step size of each adjustment of the tap coefficients of the adaptive equalizer in the embodiment of the present invention is changed to 3 taps, that is, T=3.

[0091] At this time, the condition that needs to be satisfied for adjusting the center position of the tap coefficient is condition 5 or condition 6, wherein condition 5 is:

[0092] (h3(1)>=sh3·para1||h3(2)>=sh3·para1||h3(3)>=sh3·para1||h3(4)>=sh3·para4)&& (h3(N) +h3(N-1)+h3(N-2))<=sh3·para2&&h3(N-3)<=sh3·para3, wherein, n≥1 and n is less than or equal to N, and N is the tap in the tap coefficient queue number of coefficients.

[0093] Condition 6 is:

[0094](h3(N)>=sh3·para1||h3(N-1)>=sh3·para1||h3(N-2)>=sh3·para1||h3(N-3)>=sh3·para4 )&&(h3(1)+h3(2)+h3(3))<=sh3·para2&&h3(4)<=sh3·para3, wherein, n≥1 and n is less than or equal to N, N is the number in the tap coefficient queue The number of tap coefficients.

[0095] In the embodiment of the present invention such as Fig...

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Abstract

The invention discloses a method for adjusting tap coefficients of an adaptive equalizer. The adjustment method includes: obtaining the energy of T+1 tap coefficients at each boundary in a queue of tap coefficients of the adaptive equalizer. The energy sum of each tap coefficient in the tap coefficient queue; set the corresponding proportional coefficients based on the T+1 tap coefficients at each boundary, and calculate the product of the energy sum and each proportional coefficient; the first boundary The energy of each tap coefficient in the T+1 tap system at the location, the sum of the energy of the T tap coefficients at the second boundary, and the energy of the T+1th tap coefficient at the second boundary, respectively and the corresponding product performing a comparison and generating a comparison result; adjusting the central position of the tap coefficient according to the comparison result. The invention also discloses a device for adjusting tap coefficients of an adaptive equalizer.

Description

technical field [0001] The invention relates to the technical field of high-speed optical transmission, in particular to a method and device for adjusting tap coefficients of an adaptive equalizer. Background technique [0002] In high-speed optical transmission systems, digital signal processing circuits in digital coherent receivers perform waveform distortion correction and adaptive equalization to correct waveform distortion and compensate for various impairments in optical channels by adaptively tracking channel characteristics. In a digital coherent receiver, the adaptive equalization function is implemented by an adaptive equalizer. A component of an adaptive equalizer is as figure 1 filter shown. The adaptive convergence process of the tap coefficients plays a key role in the stable operation of the adaptive equalizer. However, since the channel impairment is time-varying, it may cause the tap coefficient of the filter to shift from the center position to the boun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/01H04B10/61
CPCH04B10/61H04L25/03H04L25/03044H04L27/01H04B10/616H04L25/03012H04L25/03019H04L2025/037
Inventor 刘磊
Owner SANECHIPS TECH CO LTD