Swept-Tone Interferer Mitigation via Segmented Frequency Bins
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively mitigating swept-tone interferers due to their fast frequency variations, which degrade system performance and complicate mitigation techniques.
Innovation Solution
The method estimates the period of the swept-tone interferer by modeling it as a magnitude-periodic signal with a common pulse shape and distinct phase rotations, generating an energy signal, and using this model to subtract the interfering signal from the received composite signal, thereby mitigating its impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If adaptive notch filters are used to track the instantaneous frequency of the swept tone, then the mitigation of swept-tone interferers is improved, but the complexity of the system increases due to the need for continuous frequency tracking
Solution Approach 1:
The patent segments the continuous frequency tracking problem into discrete frequency bins that are independently processed. Instead of continuously tracking the instantaneous frequency, the method divides the frequency spectrum into multiple bins and processes each bin separately, reducing the overall system complexity while maintaining effective mitigation.
Solution Approach 2:
The patent employs periodic frequency sweeping across discrete bins rather than continuous tracking. The system periodically cycles through different frequency bins, measuring and mitigating interferers in each bin during its time slot. This periodic action reduces the instantaneous processing complexity compared to continuous tracking while maintaining comprehensive coverage.
2Measurement precision
If joint estimation of chirp signal parameters using least-squares approach is used, then the accuracy of interferer characterization is improved, but the computational complexity increases
Solution Approach 1:
The patent segments the parameter estimation problem by treating each frequency bin independently. Instead of performing joint estimation of all chirp parameters across the entire signal, the method estimates parameters separately for each frequency bin, significantly reducing computational complexity while maintaining adequate accuracy for mitigation purposes.
Solution Approach 2:
The patent applies partial estimation by focusing only on the essential parameters needed for mitigation in each frequency bin, rather than performing complete joint estimation of all chirp signal parameters. This partial action approach reduces computational burden while providing sufficient information for effective interferer cancellation.
3Adaptability or versatility
If the interferer sweep-range crosses the observation bandwidth, then the coverage of interference mitigation is improved, but the difficulty of detecting and measuring the interferer increases
Solution Approach 1:
The patent segments the broad frequency range into multiple discrete bins, making detection and measurement more manageable. By dividing the observation bandwidth into smaller frequency bins, the system can independently detect and measure interferers in each bin, reducing the overall detection difficulty even when the sweep-range crosses the entire observation bandwidth.
Solution Approach 2:
The patent uses periodic sweeping through frequency bins to detect and measure interferers across the entire observation bandwidth. This periodic action allows the system to methodically examine each frequency bin over time, making the detection process more systematic and less difficult compared to attempting to detect all frequencies simultaneously.
Data Source
AI summary
The estimation and mitigation of swept-tone interferers includes receiving a composite signal comprising a signal of interest and a swept-tone interferer over an observation bandwidth. The estimation of the interfering signal may be based on modeling the interferer over the observation bandwidth as a magnitude periodic signal comprising non-overlapping, contiguous epochs, where each epoch may comprise a common pulse shape and a distinct phase rotation. The period of the magnitude-periodic signal may be initially determined, and the common pulse shape and each of the distinct phase rotations may then be estimated. These estimates may be used to reconstruct an estimate of the swept-tone interferer, which may be subtracted from the composite signal to generate an interference-mitigated signal of interest.