Wireless Channel Detection for LOS/NLOS Positioning Accuracy
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Solution Overview
Problem
Existing radio communication systems struggle to differentiate between line of sight (LOS) and non-line of sight (NLOS) transmission environments, which significantly affect positioning performance in user terminal systems.
Innovation Solution
A method and apparatus for detecting the type of wireless channel by analyzing frequency domain channel responses, phase consistency, and path loss to determine whether the transmission is LOS or NLOS, using techniques such as carrier phase slope consistency, ratio of phase differences, and path loss analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radio communication systems are used without specialized detection methods, then the system structure remains simple, but the ability to differentiate between LOS and NLOS transmission environments is insufficient, leading to reduced positioning precision
Solution Approach 1:
The patent introduces a detection device as an intermediary component that analyzes channel responses to determine transmission environment type. This mediator processes the raw channel data and provides classification information without requiring complex modifications to the entire communication system, thereby improving positioning precision while controlling overall system complexity
Solution Approach 2:
The patent replaces physical/geometric methods of determining transmission environment with signal processing and mathematical analysis. By using channel response analysis, phase difference calculation, and slope consistency detection, the system substitutes mechanical/physical detection approaches with electronic signal processing methods, achieving higher precision with manageable complexity
2Measurement precision
If channel response analysis methods are implemented to identify LOS/NLOS environments, then positioning precision is improved, but the detection and measurement process becomes more complex
Solution Approach 1:
The patent segments the channel response analysis into distinct processing stages: receiving channel responses, calculating phase differences, determining slope consistency, and classifying transmission environment. This segmentation breaks down the complex detection process into manageable steps, improving identification accuracy while making the measurement process more systematic and controllable
Solution Approach 2:
The patent implements a multi-factor detection approach that analyzes multiple aspects of channel responses (phase differences across frequencies, slope consistency, path loss characteristics). By performing partial analyses of different channel properties and combining results, the system achieves high identification accuracy without requiring complete analysis of all possible channel parameters, balancing precision and complexity
Data Source
AI summary
A wireless channel type detection method and apparatus. The type of a channel can be identified on the basis of at least one of carrier phase slope consistency, a ratio of phase differences of carrier phases at different times, and a carrier path loss, i.e., the type of the channel is determined to be LOS transmission or NLOS transmission. Thus, the precision of positioning resolution can be effectively improved.