Sub-sampling Antenna Elements for Interference Management
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Solution Overview
Problem
Wireless networks, particularly in small cell deployments and unlicensed frequency bands, face challenges in reliably assessing and adapting to environmental interference, which affects connectivity and requires efficient self-configuration and interference management.
Innovation Solution
An antenna apparatus with omnidirectional elements and shared RF chains, utilizing selective connection circuitry and signal detection circuitry to construct a signal sample spatial covariance matrix and apply beamforming algorithms for parameterization, enabling adaptive configuration and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of RF chains is reduced to lower cost and complexity, then device complexity and cost decrease, but the ability to simultaneously process signals from multiple antenna elements deteriorates
Solution Approach 1:
The patent divides the antenna array into multiple sub-arrays, each served by a separate RF chain. This segmentation allows the system to process signals from multiple spatial directions simultaneously despite having fewer RF chains than total antenna elements, resolving the contradiction between reduced complexity and maintained productivity.
Solution Approach 2:
The patent introduces spatial dimension processing by using multiple sub-arrays arranged in specific geometries (e.g., uniform linear arrays). By exploiting the spatial dimension and using techniques like beamforming and direction of arrival estimation across sub-arrays, the system compensates for having fewer RF chains while maintaining signal processing capability.
2Reliability
If small cells are deployed to enhance quality of service and capacity, then network performance improves, but the number of feeder terminals increases requiring more complex self-organization and self-configuration
Solution Approach 1:
The patent implements self-organization and self-configuration capabilities in the wireless network nodes, enabling them to automatically detect, assess, and adapt to environmental conditions without manual intervention. This self-service approach manages the complexity of deploying numerous small cells by allowing the system to autonomously handle configuration and interference management.
Solution Approach 2:
The patent employs feedback mechanisms where nodes continuously monitor environmental interference and network conditions, then use this information to dynamically adjust their operation. This feedback loop enables automated adaptation to changing conditions, reducing the operational complexity of managing multiple small cells.
3Adaptability or versatility
If nodes are equipped with full signal processing capability to adapt to environmental interference, then adaptability improves, but device complexity and cost increase
Solution Approach 1:
The patent segments the signal processing function across multiple sub-arrays and RF chains, allowing each node to maintain adequate adaptability while distributing the processing complexity. This segmentation enables interference adaptation without requiring every node to have full processing capability for all antenna elements.
Solution Approach 2:
The patent implements partial signal processing capability at each node, focusing on the most critical functions for interference adaptation. By performing partial processing locally and using coordination with neighboring nodes, the system achieves sufficient adaptability without the full complexity that would be required for complete independent processing at each node.
Data Source
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AI summary
An antenna apparatus for use in a wireless network and method of operating such an antenna apparatus are provided. The antenna apparatus has plural omnidirectional antenna elements and plural RF chains, where there are fewer RF chains than omnidirectional antenna elements. A subset of the plural omnidirectional antenna elements are coupled to the plural RF chains and sampling circuitry coupled to the plural RF chains samples the signals received by the subset of the plural omnidirectional antenna elements. This forms part of a signal detection process in which different subsets of the plural omnidirectional antenna elements are iteratively coupled to the plural RF chains. A signal sample spatial covariance matrix for the plural omnidirectional antenna elements is constructed from the signals sampled by the sampling circuitry at each iteration and a beamforming algorithm applied to the signal sample spatial covariance matrix parameterises the signals received by the plurality of omnidirectional antenna elements.