Terminal Speed Measurement via Time-Domain Channel Delay Path
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Solution Overview
Problem
Current methods for measuring the moving speed of a terminal in communication systems, such as the crossing rate and correlation algorithms, face challenges like accuracy issues due to noise and limitations in applicability across different channel types, leading to inefficient and delayed channel estimation and signal detection.
Innovation Solution
A method and device that utilize pilot sequences to determine time-domain channel estimation values, select a delay path based on power values, and calculate the moving speed of a terminal, allowing for high-precision speed measurement without being affected by noise or algorithmic factors, and enabling immediate application to channel estimation and signal detection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crossing rate algorithm is used to measure speed, then the algorithm is simple and easy to perform, but the accuracy is affected by noise and requires signal preprocessing
Solution Approach 1:
The patent extracts only the necessary information (delay path locations) from the channel response without requiring comprehensive signal preprocessing. By focusing on identifying delay paths through peak detection in the time-domain channel estimation, the method avoids the complex de-noising and de-burring operations required by the crossing rate algorithm, thereby maintaining simplicity while improving accuracy.
Solution Approach 2:
The patent introduces time-domain channel estimation as an intermediary step that transforms the frequency-domain channel response into a form where delay paths can be easily identified. This intermediary transformation allows accurate speed measurement without requiring direct signal preprocessing, bridging the gap between simplicity and accuracy.
2Adaptability or versatility
If the correlation algorithm is used to measure speed, then the algorithm can work on Rayleigh channels, but it cannot be directly applied to Rician channels without revision
Solution Approach 1:
The patent creates a universal speed measurement method based on delay path tracking that works across different channel types (Rayleigh, Rician, and others) without requiring algorithm revisions. The core mechanism of identifying delay paths through time-domain channel estimation is channel-type-agnostic, making the method universally applicable while maintaining simplicity.
Solution Approach 2:
The patent changes the approach from correlation-based methods that require channel-type-specific parameters (like Rician factor K) to a delay path-based method that relies on time-domain channel estimation characteristics. This parameter transformation enables the algorithm to adapt to different channel conditions without increasing complexity.
3Reliability
If statistic operation is performed on channel response values throughout the bandwidth, then channel estimation can be performed, but considerable calculation effort is required and results are delayed
Solution Approach 1:
The patent extracts only the essential information needed for speed measurement (delay path locations) from the channel response, rather than performing comprehensive statistic operations on all channel response values across the bandwidth. This selective extraction maintains sufficient accuracy for speed measurement while dramatically reducing calculation effort and enabling real-time application.
Solution Approach 2:
The patent performs partial channel estimation focused specifically on identifying delay paths in the time domain, rather than performing full bandwidth channel estimation. This partial action provides sufficient information for speed measurement without the considerable calculation effort required for complete channel response analysis.
Data Source
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AI summary
Provided are a method and device for testing the moving speed of a terminal, which are used for testing the moving speed of a terminal according to the pilot and noise power, thereby improving measurement accuracy. The method comprises: a receiving end receiving a signal which comprises a pilot sequence and is sent by a sending end; according to the known pilot sequence and the signal comprising the pilot sequence, the receiving end determining an estimated value of a time-domain channel corresponding to each pilot symbol of the pilot sequence in a transmission process, and selecting a time-delay path according to the estimated value of the time-domain channel; and according to the time-delay path selected in a preset time length, the receiving end determining the moving speed of a terminal.