Beamforming Coefficient Selection for SBFD Interference Suppression
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Solution Overview
Problem
The challenge of interference in subband non-overlapping full duplex (SBFD) deployments in 5G wireless communication systems, particularly due to the impracticality of using duplexing filters to isolate uplink and downlink transmissions on the same frequency channel, is addressed.
Innovation Solution
An antenna array configuration method is employed, where the base station dynamically selects configurations for uplink and downlink antenna elements based on interference channel matrices and beamforming coefficients, minimizing interference by optimizing power distribution and applying transformed beamforming vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If duplexing filters are used to isolate uplink and downlink transmissions, then interference between uplink and downlink is reduced, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the interference mitigation function from physical duplexing filters and implements it through digital signal processing. Specifically, interference channel matrices are estimated and used to calculate beamforming coefficients that suppress interference, thereby removing the need for complex hardware filters while achieving the same isolation effect
Solution Approach 2:
The patent replaces the mechanical/electrical duplexing filter system with a digital signal processing system. By using interference channel matrix estimation and beamforming coefficient calculation, the system substitutes physical filtering mechanisms with computational methods, reducing hardware complexity while maintaining interference suppression performance
2Object-affected harmful factors
If beamforming coefficients are optimized to minimize interference, then interference suppression performance improves, but computational complexity and processing time increase
Solution Approach 1:
The patent performs preliminary estimation of interference channel matrices before actual beamforming operation. By pre-calculating the interference characteristics and incorporating them into the beamforming coefficient optimization, the system reduces real-time computational burden while maintaining optimal interference suppression performance
Solution Approach 2:
The patent transforms the beamforming optimization problem by changing parameters from direct interference minimization to a formulation based on interference channel matrices. This parameter transformation enables more efficient computation of beamforming coefficients while achieving the same interference suppression goal
3Object-affected harmful factors
If antenna configurations are dynamically selected based on interference channels, then interference mitigation effectiveness improves, but system control complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where interference channel matrices are continuously estimated and used to adjust beamforming coefficients. This closed-loop feedback system automatically adapts antenna configurations to current interference conditions, simplifying the control process while maintaining optimal interference mitigation performance
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for interference reduction. One method may include calculating at least one downlink beamforming coefficients vector, and estimating at least one channel coefficient. Interference may be calculated, and a configuration may be selected based upon a determination of interference power. The transformed beamforming coefficients vector may be calculated by at least one of minimizing maximum interference power over one or more uplink antenna elements, minimizing mean interference power over one or more uplink antenna elements, or minimizing interference power based on uplink beamforming.