Adaptive FIR Tap Allocation for Variable Interference Filtering
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Solution Overview
Problem
FIR filters with fixed tap numbers are inadequate for varying interference environments, leading to resource waste or insufficient filtering performance, as they cannot adapt to changing signal qualities and interference levels.
Innovation Solution
A device comprising designated FIR filters and allocation FIR filters, with a switching circuit and estimation/control circuit to dynamically adjust the number of taps based on signal quality parameters, optimizing filter performance by combining designated and allocation filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a FIR filter with fixed and large number of taps is used to handle worst-case interference, then filtering performance in severe environments is improved, but resource waste occurs in environments with lighter interference
Solution Approach 1:
The patent implements dynamic tap number adjustment by introducing a control unit that dynamically selects between first and second FIR filters based on interference detection. The system transitions from static fixed-tap filters to dynamic adaptive filters, adjusting the number of taps (filter order) according to real-time interference conditions, thereby resolving the contradiction between maintaining high filtering performance and avoiding resource waste.
Solution Approach 2:
The patent changes the parameter of tap number from fixed to variable. By detecting interference conditions and adjusting the tap number parameter accordingly (using fewer taps for light interference, more taps for severe interference), the system optimizes resource allocation while maintaining adequate filtering performance across different environmental conditions.
2Loss of substance
If a FIR filter with fixed and small number of taps is used to save resources, then resource efficiency is improved, but filtering performance becomes insufficient in severe interference environments
Solution Approach 1:
The system employs dynamic filter selection where a control unit monitors interference conditions and switches between filters with different tap numbers. This dynamic adaptation ensures that the filter has sufficient taps to handle severe interference when necessary, while using fewer taps for resource efficiency during normal conditions, thus resolving the contradiction between resource efficiency and filtering performance.
Solution Approach 2:
The patent segments the filtering function into multiple filters with different tap numbers (first FIR filter with fewer taps, second FIR filter with more taps). This segmentation allows the system to select the appropriate filter segment based on interference severity, ensuring resource efficiency for minor interference while maintaining adequate performance for severe interference conditions.
3Adaptability or versatility
If separate FIR filters with different tap numbers are used for different interference types, then adaptability to various interference conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by having a single filtering system that can perform multiple filtering configurations. The control unit enables the system to function as different filter types (first FIR filter or second FIR filter) based on interference conditions, making one system universal enough to handle various interference scenarios without requiring completely separate dedicated filters for each interference type.
Solution Approach 2:
The control unit acts as an intermediary that manages the complexity of having multiple filter configurations. It detects interference conditions and automatically selects the appropriate filter, shielding the user from the complexity of manual filter configuration while still providing adaptive filtering capabilities across different interference types.
4Measurement precision
If the tap number of FIR filter is increased to improve filtering accuracy, then interference cancellation capability is improved, but computational cost and processing time increase
Solution Approach 1:
The patent applies partial action by using fewer taps (first FIR filter) when interference levels are low, and excessive action by using more taps (second FIR filter) when interference levels are high. This adaptive approach ensures that computational resources are not wasted on excessive processing when not needed, while providing sufficient processing power when interference requires higher filtering accuracy, thus resolving the contradiction between filtering accuracy and processing time.
Data Source
AI summary
A device for allocating a number of taps of a designated finite impulse response filter is disclosed. The device comprises a plurality of designated finite impulse response filters having fixed number of taps, a plurality of allocation finite impulse response filters having fixed number of taps, a control unit and an estimate unit. Depending on intensities of responses to interferences, at least one of the allocation FIR filters may be coupled in series to any one of the designated finite impulse response filters, thereby to provide a signal having excellent quality.