Reconfigurable Reflective Arrays for Angle-of-Arrival Beam Steering
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Solution Overview
Problem
Existing technologies face challenges in efficiently re-configuring re-configurable reflective devices (RRDs) to provide optimal spatial filters for wireless communication, particularly in dynamic environments where the angles of arrival of communication signals may change.
Innovation Solution
The proposed method involves receiving a reference signal from a communication node on a positioning radio channel, determining the estimated angle of arrival of the signal, and re-configuring the RRD accordingly to provide multiple spatial filters associated with specific input and output directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RRD is re-configured to provide multiple spatial filters for different input spatial directions, then the adaptability to changing signal angles is improved, but the device complexity increases
Solution Approach 1:
The RRD employs dynamic re-configuration of its antenna array phase relationships to adapt to changing signal angles. The system continuously monitors signal characteristics and adjusts the spatial filter configuration in real-time, transforming a static device into a dynamic one that can respond to environmental changes without requiring multiple fixed configurations
Solution Approach 2:
The system changes the phase relationship parameter between antennas to re-configure spatial filters for different input directions. By modifying this key parameter, the RRD can adapt to various signal angles and coverage requirements without adding physical hardware complexity
2Measurement precision
If reference signals are transmitted repeatedly on positioning radio channels for angle estimation, then the measurement precision of angle of arrival is improved, but the use of energy increases
Solution Approach 1:
The system transmits reference signals periodically on positioning radio channels rather than continuously. This periodic transmission allows the RRD to accumulate angle of arrival measurements over time to improve precision while consuming energy only during specific intervals, balancing measurement accuracy with energy efficiency
Solution Approach 2:
The RRD uses feedback from angle of arrival measurements to determine when re-configuration is necessary. By monitoring signal characteristics and comparing against thresholds, the system can defer re-configuration until it is truly needed, reducing unnecessary reference signal transmissions and energy consumption while maintaining measurement precision when required
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the ability of RRDs to adapt to changing signal angles, thereby improving communication efficiency and coverage area by ensuring that incident signals are effectively reflected towards their intended destinations.
Implementation Method 1
The array of antennas can be semi-passive. Semi-passive can correspond to a scenario in which the antennas do not provide signal amplification, but can impose a variable phase shift.
Implementation Method 2
An RRD can be implemented by an array of antennas that can reflect incident electromagnetic waves/signals.
Implementation Method 3
determining, by the RRD, an estimated CN1 angle of arrival of the CN1 reference signal
Data Source
AI summary
A method is proposed for operating a re-configurable reflective device, RRD, the RRD being re-configurable to provide multiple spatial filters, each one of the multiple spatial filters being associated with a respective input spatial direction from which incident signals on a data radio channel are accepted and with a respective output spatial direction into which the incident signals are reflected by the RRD. The method comprises: receiving, by the RRD from a first communication node, CN1, on a positioning radio channel different from the data radio channel, a CN1 reference signal, determining, by the RRD, an estimated CN1 angle of arrival of the CN1 reference signal, and reconfiguring the RRD based on the estimated CN1 angle of arrival.