Channel Impulse Response for Precise Angle-of-Departure Estimation
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Solution Overview
Problem
Existing positioning techniques for wireless communication devices, such as those used in cellular networks, struggle to achieve sub-meter level accuracy and 0.2 m precision required for industrial internet-of-things (IIoT) applications, particularly in estimating the angle of departure (AOD) of signals.
Innovation Solution
Utilizing the first path component of the channel impulse response (CIR) to estimate AOD, by monitoring reference signals across multiple resources and determining an indicator indicative of the magnitude or phase of this component, allowing for more accurate AOD estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning techniques (e.g., RSRP-based AOD estimation) are used, then the positioning system is simpler to implement, but the positioning accuracy and AOD estimation precision are insufficient to meet sub-meter level requirements
Solution Approach 1:
The patent segments the channel impulse response into multiple path components and specifically utilizes the first path component (direct path) for AOD estimation. This segmentation allows the system to focus on the most significant path component that provides the highest angular resolution, thereby improving measurement precision without requiring processing of all path components equally.
Solution Approach 2:
The patent extracts and focuses on the first path component of the channel impulse response, which corresponds to the direct line-of-sight path. By taking out only the most relevant component rather than processing the complete multi-path signal, the system achieves higher AOD estimation precision while maintaining relatively simple processing complexity.
2Measurement precision
If multiple path components are processed to improve positioning accuracy, then positioning precision improves, but the processing complexity and computational load increase
Solution Approach 1:
The patent extracts only the first path component from the complete channel impulse response, which contains the majority of the angular information. This extraction approach achieves high positioning accuracy by focusing computational resources on the most informative component rather than processing all path components, thus avoiding excessive computational complexity.
Solution Approach 2:
The patent applies local quality by treating different path components differently - specifically, it gives priority to the first path component which has the highest angular resolution characteristics. This localized focus on the most quality path component achieves high positioning precision without requiring uniform high-quality processing of all components.
3Reliability
If reference signals are transmitted across multiple resources (multi-beam transmission), then the coverage and signal quality improve, but the system complexity and overhead increase
Solution Approach 1:
The patent utilizes multi-beam transmission with multiple reference signal resources, where each beam can serve multiple functions: providing coverage, ensuring signal quality, and enabling AOD estimation. The first path component from any of these beams can be used for positioning, making the multi-beam system universally applicable for both communication and positioning purposes.
Data Source
AI summary
A method of operating a wireless communication device (102) connectable to a communications network is provided. The communications network includes an access node (101, 101-1, 101-2, 101-3). The method includes: monitoring for a plurality of reference signals (121, 122, 123) of a transmission (351) in a plurality of resources, the transmission being provided by the access node (101, 101-1, 101-2, 101-3); and based on said monitoring: participating in positioning of the wireless communication device (102) depending on an indicator indicative of at least one of a magnitude or a phase of at least one first path component (810) of an impulse response (800, 801) of a radio channel, the at least one first path component being associated with at least one reference signal (121, 122, 123) of the plurality of reference signals (121, 122, 123) of the transmission (351).