3D Beamforming Search With Focus Depth for NLOS Positioning
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Solution Overview
Problem
Wireless communication systems struggle to perform three-dimensional beamforming when a receiving device is not in line-of-sight due to the inability to distinguish it from other wireless devices and reflectors, limiting accurate location and distance estimation.
Innovation Solution
A transmitting device uses a focus depth parameter and a modified Fourier Transform with depth compensation to estimate the location and distance of a receiving device, performing three-dimensional beamforming by identifying a set of estimates of distance and possible locations, and determining parameters for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three-dimensional beamforming is performed without line-of-sight, then communication coverage is extended, but location estimation accuracy deteriorates due to inability to distinguish receiving device from other devices and reflectors
Solution Approach 1:
The system performs preliminary actions by transmitting multiple reference signals at different times with different focus depths before actual communication. This allows the receiving device to provide feedback on received signal strength for each focus depth, enabling accurate location estimation even without line-of-sight conditions.
Solution Approach 2:
The receiving device provides feedback information indicating the received signal strength for each reference signal transmitted at different focus depths. This feedback mechanism enables the transmitting device to accurately determine the location and focus depth of the receiving device, resolving the ambiguity between different devices and reflectors.
2Measurement precision
If multiple reference signals are transmitted at different focus depths, then location estimation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The system segments the location estimation process into discrete focus depth levels. Instead of continuously searching through all possible locations, the system divides the space into multiple focus depth planes and transmits reference signals at each discrete level, making the complex three-dimensional search manageable and systematic.
Solution Approach 2:
The system uses periodic transmission of reference signals at different focus depths in a structured sequence. This periodic action allows the receiving device to measure and report signal strength for each depth level systematically, enabling accurate location determination through ordered sampling of the spatial domain.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device (e.g., a user equipment (UE) or a network entity) may identify a set of estimates of distance for a plurality of devices in a first direction between the first wireless device and a second wireless device. The first wireless device may identify a possible location using a pair of coordinate values for a second direction and a third direction, where the possible location is for the second wireless device in relation to the first wireless device. Based on the set of estimates of distance and the possible location of the second wireless device, the first wireless device may determine a set of parameters for a three-dimensional beamforming procedure, the set of parameters including inputs to the three-dimensional beamforming procedure. The first wireless device may communicate with the second wireless device in accordance with the three-dimensional beamforming procedure.