Adaptive Equalizer Tap Selection for Low-Power Optical Compensation
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Solution Overview
Problem
Existing adaptive equalizers face challenges in achieving high equalization performance while maintaining low power consumption, particularly due to the difficulty in determining the optimal number of taps without degrading compensation accuracy.
Innovation Solution
The adaptive equalizer employs a dual-filter configuration where the second digital filter updates tap coefficients and sets them as initial values for the first digital filter, with a tap-coefficient control circuit judging and setting invalid coefficients to zero, prioritizing valid coefficients for calculations, thereby optimizing tap usage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of taps in the digital filter is increased to improve equalization performance, then the equalization accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control of the tap number in the digital filter, allowing the system to adjust the number of taps based on transmission conditions. This enables the filter to use more taps when high equalization accuracy is needed while using fewer taps when power consumption is a concern, thus resolving the contradiction between accuracy and energy consumption
Solution Approach 2:
The patent changes the parameter of tap number dynamically according to transmission conditions. By adjusting this key parameter, the system can optimize the balance between equalization performance and power consumption, achieving high accuracy when needed while maintaining low power consumption in other conditions
2Use of energy by moving object
If the number of taps is reduced from the center tap to achieve low power consumption, then the power consumption is reduced, but the compensation accuracy degrades under large DGD load
Solution Approach 1:
The patent dynamically adjusts which taps are activated based on transmission conditions. Under large DGD load conditions, the system can activate taps at both ends that are critical for compensation accuracy, while under normal conditions, it can limit taps to reduce power consumption. This dynamic approach prevents the degradation of compensation accuracy while achieving power savings
3Measurement precision
If the optimal number of taps is determined according to equalization performance to achieve high accuracy, then the equalization performance is improved, but the difficulty in determining the optimal number increases
Solution Approach 1:
The patent employs algorithms that enable the system to automatically determine the optimal number of taps based on transmission conditions without requiring complex external intervention. The system self-adjusts the tap configuration, simplifying the determination process while maintaining high equalization performance
Data Source
AI summary
A tap-coefficient control circuit sets the tap coefficient converged by the second tap coefficient updater as an initial value of the tap coefficient in the first digital filter which is to be updated by the first tap coefficient updater, arranges the tap coefficients converged by the second tap coefficient updater in descending order of contribution degree to the convergence operation of tap coefficient update in the first tap coefficient updater, judges the tap coefficient not less than upper specified number to be valid and the tap coefficient less than the specified number to be invalid, and sets the tap coefficient of the first digital filter corresponding to the tap coefficient judged to be invalid to zero not to be used in a calculation of the first tap coefficient updater until a next judgment result is made.