Physical-layer-based method and device for realizing indoor positioning of wireless network

Abstract

The embodiment of the invention discloses a physical-layer-based method and device for realizing indoor positioning of a wireless network. The method comprises the steps of: acquiring the channel state information of a plurality of subcarriers of a target node based on an OFDM (Orthogonal Frequency Division Multiplexing) platform of a physical layer; calculating signal intensity according to the channel state information of the plurality of subcarriers; optimizing a propagation path loss model of an indoor environment according to the signal intensity; calculating the distance between each sending party and each receiving party according to the optimized propagation path loss model; and positioning the target node according to the signal intensity and the distances. In the embodiment of the invention, under the condition that an indoor environment multipath effect is ubiquitous, the precise channel state information is utilized to calculate the signal intensity in the wireless local area network so as to further realize the indoor positioning, the frequency diversity of the channel state information is utilized to reduce multipath attenuation and reduce the influences of the indoor environment multipath effect and frequency selective attenuation, and thus, the position information of the target node can be calculated more precisely and the positioning precision is increased.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a physical layer-based wireless network indoor positioning method and device thereof. Background technique [0002] With the rapid development of communication technology and wireless network, people's demand for wireless indoor positioning is increasing day by day. In order to provide users with various services based on location information, indoor location, as a hotspot of location technology research, has attracted more and more attention. Wireless Local Area Networks (WLAN) is a widely deployed new information acquisition platform. As a technology for indoor positioning, its high-density and low-cost characteristics are particularly competitive. However, due to the complexity of the indoor environment, indoor localization technology faces major challenges. How to eliminate this effect, so as to improve the positioning performance of WLAN indoors beco...

AI Technical Summary

Problems solved by technology

In other words, the method of calculating the distance between the transmitting source and the receiving end based on the received signal strength according to the radio frequency signal propagation model will have the effect of inaccurate positioning

Therefore, it is not reliable to use the received signal strength indicator value (RSSI value) to calculate the signal strength

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