Full-Duplex Beamforming Self-Interference Management
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Solution Overview
Problem
Current 5G communication systems face challenges in implementing a full-duplex scheme, especially in high spatial fading correlation environments, where beamforming techniques are necessary to mitigate self-interference and enhance data transmission, but existing methods sacrifice spatial multiplexing gain and require complex analog circuits or additional hardware.
Innovation Solution
The proposed solution involves generating a self-interference strength table and determining optimal transmission and reception beam patterns based on channel measurement feedback, considering direction-of-arrival and fading correlation, to enable full-duplex operations without reducing the complexity of analog circuits or requiring additional hardware, by employing a beam selection/nulling scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If beamforming technique is used to mitigate self-interference in full-duplex operation, then self-interference cancellation is improved, but spatial multiplexing gain is sacrificed
Solution Approach 1:
The patent dynamically selects between different beamforming schemes (first scheme for self-interference mitigation, second scheme for spatial multiplexing) based on real-time channel conditions and spatial fading correlation characteristics. This dynamic adaptation allows the system to optimize performance by choosing the appropriate beamforming approach for each transmission scenario.
Solution Approach 2:
The patent changes beamforming parameters (beam patterns, precoding matrices) based on spatial fading correlation measurements. By adjusting these parameters according to channel conditions, the system can switch between self-interference mitigation mode and spatial multiplexing mode, resolving the contradiction between the two objectives.
2Object-affected harmful factors
If null space of self-interference channel is used for signal transmission, then self-interference cancellation is improved, but device complexity increases due to complex analog circuits
Solution Approach 1:
The patent replaces complex analog beamforming circuits with digital signal processing techniques for null space computation and beam pattern selection. By performing self-interference channel estimation and null space calculation in the digital domain, the system achieves self-interference cancellation without requiring complex analog circuit modifications.
Solution Approach 2:
The patent uses channel state information feedback to create a digital model of the self-interference channel, then computes beamforming weights based on this model. This virtual copying of the channel characteristics allows for sophisticated interference cancellation algorithms without physical circuit complexity.
3Object-affected harmful factors
If beamforming scheme is applied in high spatial fading correlation environment, then self-interference mitigation is improved, but spatial multiplexing capability deteriorates
Solution Approach 1:
The patent dynamically adapts the beamforming scheme based on measured spatial fading correlation levels. When high correlation is detected, the system switches to a beamforming mode optimized for self-interference mitigation. When low correlation is detected, it switches to a mode that maximizes spatial multiplexing capability, thus adapting to varying channel conditions.
Solution Approach 2:
The patent changes beamforming parameters including beam width, direction, and precoding matrix based on spatial fading correlation measurements. This parameter adaptation allows the system to optimize for either self-interference mitigation or spatial multiplexing depending on the current channel environment.
Data Source
AI summary
The present invention relates to a 5th-generation (5G) or pre-5G communication system provided for supporting higher data transmission rates than 4th-generation (4G) communication system such as long term evolution (LTE). The present invention relates to a method in which an access point (AP) operates a full-duplex scheme in a communication system supporting a beam-forming scheme, the method comprising the steps of: generating a magnetic interference intensity table according to transmitted beam patterns and received beam patterns; determining, by the AP, a transmitted beam pattern and a received beam pattern for all stations (STAs) on the basis of channel measurement feedback information received from the stations, which provide service, and the electromagnetic-interference intensity table; and performing a communication operation with each of the stations on the basis of the determined transmitted beam pattern and received beam pattern.