Multi-Antenna Positioning Measurements for Accurate ToA and AoA
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Solution Overview
Problem
Existing methods for determining the position of user equipment (UE) based on time of arrival (ToA) and angle of arrival (AoA) measurements are limited in accuracy and efficiency, particularly when using antennas with multiple elements.
Innovation Solution
The system employs a method to estimate channel responses for a reference antenna using cross-correlation values and a projection matrix, minimizing the difference between cross-correlation values and the channel response, to determine ToA and/or AoA, leveraging the geometry and correlation properties of antennas with multiple elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ToA and AoA measurement methods are used with multiple antenna elements, then positioning functionality is provided, but positioning accuracy is limited
Solution Approach 1:
The patent segments the channel estimation problem by separating it into individual antenna element processing. Each antenna element's channel response is estimated independently using cross-correlation with the reference signal, allowing parallel processing and reducing overall system complexity while improving accuracy through coherent combining of results from multiple elements
Solution Approach 2:
The patent introduces cross-correlation values as an intermediary between the received reference signal and the channel response estimation. By computing cross-correlation between the received signal and known reference signal at each antenna element, the system creates intermediate measurements that facilitate accurate channel response determination without requiring complex direct inversion methods
2Productivity
If simple cross-correlation methods are used for channel estimation, then computational complexity is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent performs preliminary cross-correlation operations between the received reference signal and the known reference signal before final channel response determination. This preliminary action at each antenna element prepares processed data that can be efficiently combined, reducing the complexity of subsequent positioning calculations while maintaining high accuracy through the use of correlation-based measurements
Solution Approach 2:
The patent merges the channel response estimates from multiple antenna elements by combining their cross-correlation results. This combining process coherently integrates information from all antenna elements, improving the signal-to-noise ratio and channel estimation accuracy while maintaining computational efficiency through the use of simple addition or averaging operations on the cross-correlation values
Data Source
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AI summary
Disclosed herein are systems, methods and/or computer programs for determining time and/or angle -based measurements for use in position determination. The apparatus may comprise means for receiving, at a plurality of antennae, a reference signal associated with positioning and determining cross-correlation values comprising a cross correlation between the reference signal received at each antenna and a known reference signal associated with positioning. There may also be provided means for estimating a channel response for a reference antenna of the plurality of antennae using the cross correlation values, the known reference signal and an antenna correlation comprising a known relationship between a channel response of each antenna of the plurality of antennae and the channel response of the reference antenna, and determining a time of arrival and / or an angle of arrival of the received reference signal based on the estimated channel response for the reference antenna.