UE Positioning With Frequency-Domain Windowing for Multipath Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining positioning measurements due to multipath channels, which affect the reliability and precision of positioning reference signals (PRS) processing.
Innovation Solution
The implementation of a method involving the application of multiple positioning reference signal (PRS) processing windows over a multipath channel to determine channel estimates and measurements, utilizing frequency domain windowing techniques to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PRS processing methods are used in multipath channels, then the processing is simple and fast, but the positioning measurement accuracy deteriorates due to multipath interference
Solution Approach 1:
The patent divides the PRS processing into multiple stages: initial channel estimation, identification of multipath components, and refined estimation using frequency domain windowing. By segmenting the processing steps and applying different techniques to different parts of the signal, the method achieves high accuracy in resolving multipath components while maintaining manageable computational complexity through systematic organization of processing tasks
Solution Approach 2:
The patent transitions from time-domain processing to frequency-domain processing by applying Fourier transforms and frequency domain windowing functions. This dimensional change allows better separation of multipath components in the frequency domain, where their spectral characteristics can be more effectively distinguished, thereby improving measurement precision without proportionally increasing complexity
2Measurement precision
If frequency domain windowing is applied to handle multipath signals, then positioning accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent applies frequency domain windowing selectively to specific frequency regions where multipath components are identified, rather than processing the entire frequency spectrum uniformly. This partial action approach concentrates computational energy on the critical regions affecting positioning accuracy while reducing overall computational load by excluding regions with minimal multipath interference
Solution Approach 2:
The patent dynamically adjusts the windowing parameters (window function type, window width, frequency range) based on the identified multipath characteristics and signal conditions. By changing these parameters adaptively, the method optimizes the balance between computational energy consumption and positioning accuracy, applying more aggressive windowing only when and where multipath interference is detected
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) applies a plurality of positioning reference signal (PRS) processing windows to a PRS resource received from a network node over a multipath channel, determines a plurality of channel estimates for the PRS resource based on the plurality of PRS processing windows, and determines a plurality of positioning measurements of the PRS resource based on the plurality of channel estimates.