Carrier-Aggregated Signal Transmission for Phase-Aligned Positioning
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Solution Overview
Problem
Current methods for achieving centimeter-level positioning precision require a bandwidth of at least 200 MHz, but hardware limitations cause phase differences in carrier components, leading to inaccurate location estimation due to the inability to restore valid large-bandwidth signals.
Innovation Solution
A signal transmission method that distributes frequency domain resources across multiple carrier components with overlapping parts, allowing phase difference estimation to restore larger bandwidth signals, thereby improving positioning precision without increasing costs, complexity, or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier aggregation technology is used to send reference signals on multiple carrier components to achieve larger bandwidth, then positioning precision is improved, but phase differences between carrier components cause signal restoration failure and reduce positioning accuracy
Solution Approach 1:
The patent introduces an overlapping frequency domain resource as an intermediary between multiple carrier components. This overlapping resource serves as a common reference that enables phase difference estimation and compensation across carrier components, allowing signals to be properly aligned and restored while maintaining large bandwidth for high positioning precision
Solution Approach 2:
The patent changes the frequency domain parameters by creating overlapping frequency resources across carrier components. By adjusting the frequency domain allocation to include overlaps, the system enables phase difference estimation and compensation, transforming the signal restoration process to account for hardware-induced phase variations while maintaining large bandwidth
2Measurement precision
If bandwidth is increased to at least 200 MHz to meet centimeter-level positioning requirements, then positioning precision is improved, but hardware limitations and phase differences prevent valid signal restoration
Solution Approach 1:
The patent segments the large bandwidth signal into multiple smaller carrier components, each with manageable bandwidth. By dividing the 200 MHz bandwidth into multiple carrier components with overlapping frequency resources, the system maintains the total bandwidth needed for centimeter-level positioning while making the signal processing and phase compensation more manageable for hardware implementation
3Measurement precision
If reference signals are sent on different carrier components to achieve larger bandwidth, then positioning precision is improved, but phase inconsistency between carrier components degrades location estimation accuracy
Solution Approach 1:
The overlapping frequency domain resource acts as a mediator that provides a common reference point across carrier components. By using this overlapping resource, the system can estimate and compensate for phase differences, ensuring phase consistency is maintained across carrier components while preserving the location estimation accuracy benefits of large bandwidth
Data Source
AI summary
This application provides a signal transmission method and an apparatus. The method includes: generating m signals, where m is a positive integer greater than or equal to 2; and sending the m signals on m resources, where the m resources correspond to m frequency domain resources in frequency domain, the m resources correspond to m time elements in time domain, a first frequency domain resource used by a signal carried in an ith time element is distributed on at least two carrier components, a second frequency domain resource used by a signal carried in a jth time element is distributed on at least one carrier component, there is an overlapping part between the second frequency domain resource and the first frequency domain resource.