Full-Duplex Beamforming With Self-Interference Feedback
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Solution Overview
Problem
In full duplex radio (FDR) environments, conventional beamforming methods fail to consider self-interference (SI) from sidelobe beams, deteriorating link quality between base stations and user equipment due to unaccounted self-interference effects.
Innovation Solution
A method is introduced to measure and adjust transmission beams based on self-interference signal strength using reference signals, incorporating feedback information to optimize beamforming without additional receiving-end circuits, employing demodulation reference signals or channel state information-reference signals, and allocating resources in a comb type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional beamforming method is used to maximize beam gain for desired signal, then beam gain is improved, but self-interference from sidelobe beam deteriorates link quality
Solution Approach 1:
The patent changes the beamforming parameters by introducing a beam adjustment process that considers both desired signal gain and self-interference levels. The beam direction is dynamically adjusted based on measured self-interference strength and feedback information, transforming the beamforming from a static maximum-gain approach to a dynamic optimization that balances gain and interference reduction.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving end measures self-interference strength and sends feedback information to the transmitting end. This feedback loop enables the beamforming process to adapt to actual channel conditions and self-interference levels, allowing continuous optimization of beam direction to minimize self-interference while maintaining desired signal quality.
2Productivity
If beamforming is applied in full duplex radio system, then communication capacity is improved, but self-interference effect increases without additional circuits
Solution Approach 1:
The patent enables the beamforming system to self-optimize by using the receiving end's own self-interference measurements to guide the transmitting end's beam adjustment. The system uses its own operational characteristics (self-interference strength) to improve its performance, eliminating the need for external intervention or additional cancellation circuits.
3Object-affected harmful factors
If additional circuits are implemented at receiving end to reduce self-interference, then self-interference is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the need for additional hardware circuits with a signal processing approach based on beamforming adjustment. Instead of using electronic circuits to cancel self-interference, the system uses intelligent adjustment of beam directions and patterns to spatially separate desired signals from self-interference, substituting mechanical/electronic complexity with algorithmic optimization.
Data Source
AI summary
The present document discloses a method by which a transmission device transmits and receives a signal in a wireless communication system, comprising the steps of: transmitting a reference signal (RS) using a transmission beam; measuring the strength of a self-interference (SI) signal on the basis of the RS; receiving feedback information associated with the RS; and adjusting the transmission beam on the basis of the strength of the SI signal and the feedback information, wherein the RS includes request information for requesting channel state measurement, and the request information includes information on whether link quality measurement is performed, and information on resource allocation of the RS.