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Adjusting equalizer settings using ISI or Q calculations

An equalizer, equalization technology, applied in the direction of equalizer, carrier adjustment, modulation carrier system, etc.

Pending Publication Date: 2022-06-10
MACOM TECH SOLUTIONS HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through testing, this prior art method for determining equalizer settings has been found to be inaccurate
Often this approach sets the EQ too low and the error is not consistent across signal changes such that a simple offset adjustment will not give accurate results

Method used

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  • Adjusting equalizer settings using ISI or Q calculations
  • Adjusting equalizer settings using ISI or Q calculations
  • Adjusting equalizer settings using ISI or Q calculations

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Embodiment Construction

[0020] Disclosed below is an overview of the innovations, followed by reference to figure 1 for a more detailed discussion. In order to overcome the shortcomings of the prior art, using statistical analysis, sampling plots reveal band centers and band noise, which can be processed and combined to estimate the Q result. These same band centers and band noise are used to calculate OEH or OEA. However, when the Q parameter is set too high or when the input eye is very small or noisy, the OEH results become blinded. This blindness makes the OEH adjustment in some cases unable to decide in which direction to adjust the CTLE setting. OEA calculations sometimes converge on the short / wide eye rather than the tall / narrow eye, even though the taller eye is preferred even if it is narrow. The eye-height-to-ISI Q ratio is less likely to produce blind zero results, and optimizing it at only one phase angle (the angle with the largest Q result) leads to better equalizer settings than st...

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PUM

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Abstract

A method and apparatus for processing a signal to generate an equalizer code for controlling equalization of the signal includes processing the signal to identify eyes of the signal, and for each eye, calculating an eye height and calculating a noise value. For each eye, the eye height is squared to generate an eye height product, and the eye height product is divided by the noise value to generate a Q2 value. The equalizer code is optimized by adjustment using the calculated Q2 value. Calculating the noise value may include calculating an ISI value for each band of the signal and then calculating an eye height for each eye as a difference between adjacent upper and lower average values. Then, for each eye, a noise value is calculated by summing the ISI values of the bands above the eye and the bands below the eye.

Description

technical field [0001] The present invention relates to signal analysis and equalizer settings, and more particularly to methods of adjusting equalizers using ISI or Q calculations. Background technique [0002] After the signal passes through the channel, the signal will be distorted due to the distortion characteristics of the channel. Various signal processing techniques are used to recover the received signal and the data represented by the signal. One such processing technique is equalization using an equalizer device. The equalizer has settings that must be adjusted in order for the equalizer to tune to the channel to provide optimal signal processing. In the prior art, Inter-Symbol Interference (ISI) is calculated and used to select the optimal equalizer settings. However, through testing, this prior art method for determining equalizer settings has been found to be inaccurate. Often, this approach sets the equalizer too low, and the error is not consistent across...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/49H04L27/00H04L27/01
CPCH04L25/03019H04L25/03834H04L25/03993H04L25/4917H04L27/0014H04L27/01H04L2027/0038H04L25/03012
Inventor G.L.巴里尔四世F.冈萨雷斯
Owner MACOM TECH SOLUTIONS HLDG INC