A method and device for identifying line-of-sight propagation paths of wireless signals

Abstract

The invention provides a method and device for recognizing a line-of-sight propagation path of wireless signals. The method includes the steps that CSI corresponding to each antenna is obtained from the received wireless signals to be detected; the variance of the phase differences between each antenna and the other antennas is calculated according to the CSI corresponding to each antenna; the phase difference factor corresponding to each variance is calculated according to a first formula (please see the first formula in the specification), and the mid-value of all the phase difference factors is calculated; whether the mid-value is smaller than or equal to a preset phase difference factor threshold value or not is judged, if yes, line-of-sight propagation of the wireless signals is determined, and otherwise non-line-of-sight propagation of the wireless signals is determined. Through the method and the device, the line-of-sight propagation path of the wireless signals can be recognized in real time in a wireless network with the bandwidth limited extremely.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for identifying a line-of-sight propagation path of a wireless signal. Background technique [0002] Wireless data transmission protocol WiFi technology has bred and spawned a series of mobile and ubiquitous computing applications, such as indoor positioning, gesture recognition, activity detection, etc., many of which have exceeded wireless data transmission itself. Most of these applications rely on detailed analysis and modeling of wireless signal characteristics, and non-line-of-sight propagation can adversely affect these applications. The non-line-of-sight propagation of wireless signals will cause the quality of wireless signals to degrade, which will affect the quality of communication links and make the theoretical model of signal propagation invalid. In general, the signal becomes more unstable through non-line-of-sight propag...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the following methods are used to judge whether the wireless signal is line-of-sight propagation or non-line-of-sight propagation: some methods predict the line-of-sight / non-line-of-sight condition by analyzing the distribution of specific channel parameters (such as Kappa factor) , most of these statistical models require accurate channel measurement through dedicated channel monitors, or require long-term measurement; some methods use ultra-wideband to measure delay or distance to judge whether the wireless signal is line-of-sight or non-line-of-sight This method cannot be applied to WiFi networks, because the bandwidth of WiFi is extremely limited (only 20-40MHz), and this method cannot distinguish multipath propagation in indoor environments.

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