Beamforming Weighting Adjustment for Radar Interference Mitigation
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Solution Overview
Problem
Conventional techniques lack effective counter-measures for beamforming-enabled wireless communication apparatuses using 5.3 GHz and 5.6 GHz band channels, particularly in detecting and mitigating radar signals during communication.
Innovation Solution
A communication apparatus with multiple antennas, a communication unit, an adjustment unit for beamforming, a detection unit for radar signals, and a determination unit to adjust weighting coefficients to manage radar signal reception levels, allowing continued communication by altering beamforming settings when radar signals are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to enhance communication performance on 5.3 GHz and 5.6 GHz channels, then communication efficiency is improved, but radar signal detection capability deteriorates due to directional beam concentration
Solution Approach 1:
The patent implements dynamic switching between beamforming mode and omnidirectional monitoring mode based on communication requirements and radar detection needs. The system dynamically adjusts the antenna radiation pattern from directional (beamforming) to omnidirectional (monitoring) states, allowing both communication efficiency and radar detection capability to be optimized at different times without permanent compromise
Solution Approach 2:
The patent employs periodic radar signal monitoring intervals during communication operations. The system alternates between communication transmission and radar channel monitoring in periodic cycles, ensuring that radar detection capability is maintained regularly while communication efficiency is preserved during active transmission periods
2Reliability
If the apparatus monitors for radar signals for 1 minute before channel usage, then radar interference is avoided, but communication setup time increases
Solution Approach 1:
The patent performs preliminary radar signal monitoring and detection before initiating full communication operations. By conducting radar checks in advance and maintaining detection capability during operation, the system ensures reliable radar interference avoidance while enabling faster communication setup compared to repeated full monitoring cycles
Solution Approach 2:
The patent maintains continuous or near-continuous radar monitoring capability throughout communication operations rather than performing discrete 1-minute monitoring intervals. This continuous detection approach ensures ongoing radar interference avoidance while reducing the total setup time by eliminating repeated monitoring wait periods
3Object-affected harmful factors
If weighting coefficients are adjusted to reduce radar signal reception, then radar interference is mitigated, but communication signal quality may deteriorate
Solution Approach 1:
The patent applies local quality modification by adjusting weighting coefficients specifically for radar signal directions while maintaining optimal coefficients for communication signal directions. The system identifies radar signal sources and applies differential weighting - reducing gain in radar directions while preserving or enhancing gain in communication directions, thus mitigating radar interference without compromising communication quality
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors both radar signal levels and communication signal quality after weighting coefficient adjustments. Based on this feedback, the system iteratively optimizes the weighting coefficients to achieve the dual objective of radar interference mitigation and communication quality maintenance, adjusting coefficients in response to actual system performance rather than using fixed adjustments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient communication by reducing radar signal interference, allowing the apparatus to use the same frequency channel while minimizing impact on weather radar systems by adjusting beamforming and transmission/reception gains.
Implementation Method 1
a beamforming unit configured to perform beamforming for transmission and reception based on weighting coefficients
Data Source
AI summary
A communication apparatus having a plurality of antennas uses a predetermined frequency channel to perform communication, adjusts beamforming for transmission/reception by setting a weighting coefficient for each of the plurality of antennas, monitors to detect a radar signal outputted from another communication apparatus by using the predetermined frequency channel in a beamforming state formed in accordance with the weighting coefficients, and determines whether or not a reception level of the radar signal is greater than or equal to a predetermined threshold. When it is determined that the reception level of the radar signal is greater than or equal to the predetermined threshold, the communication apparatus changes the weighting coefficients, and uses the predetermined frequency channel in a beamforming state formed in accordance with the changed weighting coefficients to perform communication.