Receiver Notch Filter Coefficient Reuse for Narrowband Interference
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Solution Overview
Problem
Radio communication systems face challenges with narrowband interference, particularly in low frequency bands, where existing Notch filter implementations are resource-intensive and may not effectively handle strong interference or efficiently co-deploy multiple Radio Access Technologies (RATs) in limited spectrum scenarios.
Innovation Solution
A method and system for configuring a Notch filter in a radio communication receiver that reduces computational complexity by retrieving a fraction of stored filter coefficients, normalizing them, and transforming their position to filter out specific frequencies, allowing for efficient handling of narrowband interference and co-deployment of RATs in limited spectrum scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Notch filter implementations are used to filter out narrowband interference, then interference rejection capability is improved, but computational complexity increases
Solution Approach 1:
The patent segments the filter coefficient set into two parts: a first subset of coefficients that are retrieved and applied to configure the Notch filter, and a second subset of coefficients that are not retrieved. This segmentation allows the system to achieve effective interference rejection using only a portion of the available coefficients, thereby reducing computational complexity while maintaining reliability
Solution Approach 2:
The patent extracts only the necessary subset of filter coefficients from the complete set of coefficients. By taking out only the first subset of coefficients that are needed for effective Notch filter configuration, the system avoids the computational burden of processing all coefficients, thus reducing device complexity while preserving interference rejection capability
2Reliability
If traditional Notch filter implementations are used to handle strong narrowband interference, then interference rejection capability is improved, but resource consumption increases
Solution Approach 1:
The patent applies partial action by using only a fraction of the total filter coefficients (the first subset) rather than all available coefficients. This partial utilization of coefficients is sufficient to achieve effective strong interference rejection while significantly reducing computational resource consumption, as the system performs operations on fewer coefficients
3Adaptability or versatility
If traditional Notch filter implementations are used for co-deployment of multiple RATs in limited spectrum, then spectrum utilization is improved, but computational complexity increases
Solution Approach 1:
The patent segments the coefficient processing into essential and non-essential parts, retrieving and applying only the first subset of coefficients that are critical for Notch filter configuration. This segmentation enables efficient co-deployment of multiple Radio Access Technologies in limited spectrum by reducing the computational complexity associated with filter management across multiple RATs
Data Source
AI summary
A radio communication receiver and a method performed by the radio communication receiver for configuring a Notch filter of the radio communication receiver. The method comprises retrieving stored and previously determined filter coefficients from a set of filter coefficients, where the retrieved filter coefficients constitute a fraction of the total number of filter coefficients; and setting the rest of the filter coefficients to one. The method further comprises normalising the retrieved filter coefficients; and transforming the filter coefficients such that the Notch position ends up at the one or more frequencies to be filtered out.