Beamforming Repeater Filtering for mmWave Interference Mitigation
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Solution Overview
Problem
Wireless repeaters in communication systems face challenges with radiation leakage and interference from physical blockers and jammers, which affect signal quality and network efficiency, especially in millimeter wave (mmW) communications.
Innovation Solution
The implementation of beamforming repeaters with digitally assisted interference mitigation, using a combination of analog and digital components for downconversion, filtering, and upconversion, which select filter coefficients based on beamforming parameters to reduce interference from jammers and physical blockers, and employ echo cancellation and clutter filtering techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wireless repeaters are deployed to extend signal coverage, then network coverage and accessibility are improved, but radiation leakage and interference from physical blockers and jammers worsen signal quality
Solution Approach 1:
The patent applies local quality by implementing directional beamforming that focuses signal energy specifically toward target users while maintaining different characteristics in different spatial directions. The repeater configures transmit and receive beams with specific directional properties to provide enhanced coverage in desired directions while suppressing interference from unwanted directions, thus improving local signal quality without compromising overall coverage area
Solution Approach 2:
The patent converts harmful interference into beneficial signal enhancement by using interference mitigation techniques that identify and exploit the spatial characteristics of desired signals versus interfering signals. The system processes received signals to separate and enhance the desired beamformed signal while suppressing radiation leakage and jammer interference, thus transforming the harmful co-channel interference into an opportunity for improved signal quality
2Object-affected harmful factors
If beamforming parameters are adjusted to mitigate interference from jammers and physical blockers, then signal quality is improved, but device complexity increases due to digital filtering and coefficient selection
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple sets of filter coefficients corresponding to different beamforming configurations before actual operation. When the repeater needs to mitigate interference, it simply selects the appropriate pre-computed coefficient set based on current beamforming parameters, avoiding the need for complex real-time coefficient calculation and reducing computational complexity during signal processing
Solution Approach 2:
The patent utilizes parameter changes by varying filter coefficients based on beamforming parameters to adapt the interference mitigation characteristics dynamically. The system changes the filtering parameters according to the specific beamforming configuration being used, allowing the repeater to optimize interference suppression for different spatial scenarios without requiring a completely different filter design for each case
3Object-affected harmful factors
If digital filtering with beamforming-specific coefficients is implemented, then interference mitigation effectiveness is improved, but processing time and computational resources increase
Solution Approach 1:
The patent applies preliminary action by pre-computing filter coefficients for different beamforming scenarios and storing them in memory. During actual operation, the repeater only needs to retrieve the appropriate pre-computed coefficients based on current beamforming parameters and apply them directly to the received signal, significantly reducing the computational time required compared to performing complex coefficient calculations in real-time
Solution Approach 2:
The patent implements dynamics by creating a dynamic mapping between beamforming parameters and corresponding filter coefficients. The system adapts the filtering characteristics dynamically based on the active beamforming configuration, allowing rapid switching between different interference mitigation profiles without requiring time-consuming re-computation of filter parameters
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide a repeater for beamforming a received signal at a millimeter wave (mmW) radio frequency via one or more scan angles or beamforming directions and then retransmitting and beamforming the signal at the mmW radio frequency. Repeaters may include analog and digital components for downconverting on the received signal to reduce a frequency of the signal from the mmW frequency to an intermediate frequency (IF) or baseband frequency, and then filtering the downconverted signal to reduce interference. The filtering may include digital filtering or a combination of analog and digital filtering, in which a set of filter coefficients for the digital filtering is selected based on beamforming parameters used to receive the signal, retransmit the signal, or both. The repeater may then upconvert the filtered signal back to the mmW frequency for the retransmission of the signal.