Antenna Subgrouping for Full Duplex Self-Interference
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Solution Overview
Problem
Wireless access systems with massive antennas face challenges in efficiently transmitting data and achieving transmit diversity due to high correlation between antennas, which affects radio channel estimation and service coverage.
Innovation Solution
The method involves grouping antennas with high correlation into subgroups, selecting subgroups with low correlation for data symbol transmission, and transmitting data using these selected antennas while sharing an identical time-frequency resource, along with transmitting antenna configuration information to the receiving end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antennas with high correlation are used for data transmission, then the system can utilize available antennas, but the transmit diversity is reduced and radio channel estimation becomes inaccurate
Solution Approach 1:
The patent segments the massive antenna array into multiple subgroups based on correlation levels. Antennas are divided into first antenna subgroups (high correlation) and second antenna subgroups (low correlation), allowing the system to selectively use antennas with appropriate correlation characteristics for different transmission purposes, thereby maintaining transmit diversity while enabling efficient data transmission.
2Device complexity
If antennas with high correlation are grouped together, then the antenna structure is simplified, but the radio channel estimation precision deteriorates
Solution Approach 1:
The patent applies local quality by assigning different correlation characteristics to different antenna subgroups. The first antenna subgroups have high correlation and are suited for certain transmission scenarios, while the second antenna subgroups have low correlation and are optimized for accurate radio channel estimation. This localized differentiation allows the system to optimize both antenna configuration simplicity and estimation precision in their respective domains.
3Productivity
If all antennas are used for data transmission, then the transmission capacity increases, but the service coverage stability decreases due to high correlation
Solution Approach 1:
The patent implements dynamic antenna selection by configuring multiple antenna subgroups with different correlation characteristics. The system can dynamically select which antenna subgroups to use for data transmission based on channel conditions, service requirements, and coverage needs. This dynamic approach allows the system to adjust between using more antennas for capacity or selecting diverse antennas for coverage stability, resolving the contradiction between transmission capacity and service coverage stability.
Data Source
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AI summary
The present invention provides a method for removing self-interference in a wireless access system that supports a full duplex radio (FDR) scheme, and apparatuses for supporting the same. The method for removing self-interference by a transmitter side in a wireless access system that supports a full duplex radio (FDR) scheme, according to one embodiment of the present invention, comprises the steps of: transmitting two transmission signals, using two transmission antennas; receiving two reception signals, using two reception antennas; estimating a self-interference channel; and removing interference signals in consideration of the estimated self-interference channel among the received signals. In the method, the interference signals are the transmission signals which are input into the two reception antennas, the transmission signals and the reception signals are simultaneously transmitted and received through a resource area configured by the same time and frequency, and the two transmission antennas and the two reception antennas may be disposed on the transmitter side in a diamond shape.