Fixed Equalizer Coefficient Determination via Adaptive Signal Processing
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Solution Overview
Problem
Current methods for determining coefficients of fixed equalizers in optical communications systems are complex and require additional devices or expensive instruments, leading to high costs and complications.
Innovation Solution
An apparatus and method that determine coefficients of a fixed equalizer by using the coefficients of an adaptive equalizer, involving a first acquiring unit to determine adaptive equalizer coefficients, a first transforming unit to perform Fourier transforms, and a first calculating unit to calculate fixed equalizer coefficients based on the frequency responses, without the need for additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to calculate fixed equalizer coefficients by measuring static impairments one by one, then measurement precision can be maintained, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines the measurement of multiple static impairments (frequency response, delay, amplitude imbalance, phase imbalance) into a single joint measurement process. Instead of measuring each impairment separately with dedicated devices, the system measures the composite effect of all impairments simultaneously through the adaptive equalizer coefficients, then derives individual impairment characteristics from the combined measurement data.
Solution Approach 2:
The adaptive equalizer coefficients serve multiple functions: they compensate for dynamic impairments during normal operation and simultaneously provide the measurement data for determining fixed equalizer coefficients. This eliminates the need for separate measurement devices and procedures, as the same equalizer structure and signal processing path are used for both compensation and measurement purposes.
2Measurement precision
If conventional measurement methods are used for fixed equalizer coefficients, then measurement accuracy is maintained, but the calculation process becomes complex and time-consuming
Solution Approach 1:
The system performs preliminary measurement of static impairments by analyzing the adaptive equalizer coefficients during the equalization training phase. By extracting impairment characteristics before final fixed equalizer coefficient calculation, the system reduces the computational burden and time required for the subsequent coefficient determination process.
Solution Approach 2:
The patent replaces complex physical measurement systems with signal processing-based measurement. Instead of using dedicated measurement instruments and procedures, the system uses mathematical processing of the adaptive equalizer coefficients to extract impairment characteristics and calculate fixed equalizer coefficients, significantly reducing measurement time and complexity.
3Measurement precision
If additional measurement devices are used to determine fixed equalizer coefficients, then measurement precision can be improved, but cost and device complexity increase
Solution Approach 1:
The system uses its own adaptive equalizer and signal processing capabilities to perform the measurement function. The adaptive equalizer coefficients generated during normal operation are directly utilized to determine the fixed equalizer coefficients, eliminating the need for external measurement devices and reducing overall system cost while maintaining measurement accuracy.
Solution Approach 2:
The adaptive equalizer coefficients serve as an intermediary that bridges the gap between signal equalization and impairment measurement. These coefficients act as a mediator that contains information about static impairments, allowing the system to extract measurement data without requiring separate measurement instruments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the calculation process, allowing for quick and cost-effective determination of fixed equalizer coefficients, leveraging the similarity between adaptive and fixed equalizer performances.
Implementation Method 1
a first transforming unit configured to perform Fourier transform on at least a part of the coefficients of the adaptive equalizer to obtain frequency responses of the at least a part of the coefficients
Data Source
AI summary
Embodiments of this disclosure provide an apparatus and method for determining coefficients of a fixed equalizer, the fixed equalizer being applicable to performing fixed equalization on an optical communications system, the apparatus including: a first acquiring unit configured to determine coefficients of an adaptive equalizer according to an output signal of the optical communications system; a first transforming unit configured to perform Fourier transform on at least a part of the coefficients of the adaptive equalizer to obtain frequency responses of the at least a part of the coefficients; and a first calculating unit configured to calculate coefficients of the fixed equalizer according to the frequency responses of the at least a part of the coefficients of the adaptive equalizer.