Adaptive Excision and Beam Repositioning for Directional Interference
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Solution Overview
Problem
Existing systems face challenges in simultaneously optimizing Signal-to-Noise ratio (S/N) and Signal to Noise plus Interference ratio (SNIR) while maintaining desired signal reception, often requiring significant complexity and expense to cancel directional interference within the antenna main beam.
Innovation Solution
The implementation of adaptive excision and beam repositioning techniques, which involve generating sum and difference beams, using excision circuits to remove interference, and controlling the antenna positioner based on power and correlation measurements to reposition the antenna away from interference, thereby maintaining system linearity and reducing design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cluster of much narrower beams is used to achieve both reception and cancellation, then directional interference cancellation is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the beamforming function into sum beam and difference beam components. The sum beam provides the main reception pattern while the difference beam provides directional discrimination for interference cancellation. This segmentation allows interference cancellation without requiring a full cluster of narrow beams, reducing complexity.
Solution Approach 2:
The sum and difference beams serve multiple functions simultaneously: the sum beam provides signal reception while also contributing to interference measurement, and the difference beam provides both directional discrimination and interference cancellation. This multi-functionality eliminates the need for separate dedicated cancellation beams.
2Reliability
If maximum S/N and maximum SNIR are simultaneously optimized, then signal quality is improved, but it becomes impossible to achieve both goals at once requiring signal power sacrifice
Solution Approach 1:
The system dynamically adjusts beam positioning based on real-time interference conditions. When interference is detected, the beam is repositioned to prioritize SNIR; when interference is absent, the beam returns to maximizing S/N. This dynamic adaptation allows the system to achieve both optimization goals at different times rather than forcing a static compromise.
Solution Approach 2:
The system changes operational parameters (beam position, weighting factors) based on the dominant constraint. By monitoring signal and interference levels, the system adjusts parameters to optimize for S/N when interference is low and for SNIR when interference is high, eliminating the need for permanent parameter compromise.
3Object-affected harmful factors
If beam repositioning is used to reduce directional interference, then interference reduction is improved, but desired signal reception may be degraded
Solution Approach 1:
The system continuously monitors both desired signal levels and interference levels, using this feedback to adjust beam position. When repositioning to reduce interference, the system monitors signal reception quality and can adjust the degree of repositioning or apply compensation to maintain acceptable signal levels while achieving interference reduction.
Solution Approach 2:
The system uses the presence of interference as a signal to trigger beam repositioning, converting the harmful interference condition into a beneficial opportunity to improve overall signal quality. The interference measurement itself becomes useful information that drives the repositioning decision, turning a problem into a control signal.
Data Source
AI summary
Systems and methods are provided for repositioning a directional antenna that responds to a desired signal and directional interference. The antenna can generate a sum beam and first and second difference beams. Respective powers of the sum beam and the first and second difference beams can be determined. At least a portion of any of the directional interference can be excised from the sum beam and the first and second difference beams. Measures of the directional interference can be determined in the sum beam and the first and second difference beams. A first correlation between the sum beam and the first and second difference beams can be generated. Additional correlations between a signal identifier and the sum beam and first and second beams monitor the desired signal reception. The antenna can be repositioned away from the directional interference based on the powers, the measures, and the first correlation.