Nonlinear Equalizer Using Absolute Operations for Optical Systems
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Solution Overview
Problem
Current nonlinear equalization methods, such as the Volterra nonlinear equalizer, have high implementation complexity and power consumption, making them unsuitable for cost-sensitive systems, despite effectively compensating for nonlinear distortions in optical transmission systems.
Innovation Solution
An apparatus and method for nonlinear equalization that uses an absolute operation instead of multiplication operations to generate coefficients and compensate for nonlinear distortions, reducing implementation complexity and power consumption while maintaining performance similar to Volterra nonlinear equalizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Volterra nonlinear equalizer is used to compensate for nonlinear distortions, then compensation performance is improved, but implementation complexity and power consumption increase significantly
Solution Approach 1:
The patent changes the mathematical operation parameters from multiplication-based Volterra series to absolute value-based operations. Specifically, it uses absolute values of signal samples and their differences instead of complex multiplication terms, fundamentally altering how nonlinear distortions are modeled and compensated while reducing computational complexity
Solution Approach 2:
The patent extracts and eliminates the complex multiplication operations from the equalizer structure. By removing the need for numerous multiplication terms present in Volterra series and replacing them with simpler absolute value operations, it reduces the computational burden while maintaining compensation effectiveness
2Reliability
If Volterra nonlinear equalizer is used to compensate for nonlinear distortions, then compensation performance is improved, but power consumption increases significantly
Solution Approach 1:
The patent changes the mathematical operation parameters from multiplication-based Volterra series to absolute value-based operations. Specifically, it uses absolute values of signal samples and their differences instead of complex multiplication terms, fundamentally altering how nonlinear distortions are modeled and compensated while reducing computational complexity
Solution Approach 2:
The patent extracts and eliminates the complex multiplication operations from the equalizer structure. By removing the need for numerous multiplication terms present in Volterra series and replacing them with simpler absolute value operations, it reduces the computational burden while maintaining compensation effectiveness
3Device complexity
If pruned Volterra nonlinear equalizer is used to reduce complexity, then implementation complexity is reduced, but numerous multiplication operations are still required making it too complicated and expensive
Solution Approach 1:
The patent substitutes the mechanical/computational system of multiplication operations with a simpler absolute value-based system. By replacing multiplication terms with absolute value operations, it creates a more cost-effective implementation that is easier to manufacture and deploy in practical systems
Data Source
AI summary
Various example embodiments relate to an apparatus and method for nonlinear equalization based on an absolute operation, and may be configured to generate coefficients and compensate for nonlinear distortions by using an absolute operation for an input signal based the coefficients.