Indoor positioning method based on distribution of channel state information

A channel state information, indoor positioning technology, applied in the directions of location information-based services, wireless communication, nan, etc., can solve a large number of computational fingerprint sampling and other problems

Active Publication Date: 2017-01-11
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

Although these systems achieve high positioning accuracy, machine learning and deep learning require a lot of calculations and more fingerprint samples

Method used

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  • Indoor positioning method based on distribution of channel state information
  • Indoor positioning method based on distribution of channel state information
  • Indoor positioning method based on distribution of channel state information

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Experimental program
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Embodiment Construction

[0072] The system structure of the present invention is as image 3 As shown, it includes two parts, the training phase and the positioning phase. In the training phase, a mobile device equipped with an Intel 5300 network card is used to collect CSI values ​​at all reference point positions, and then the CSI obtained by each pair of transmitting and receiving antennas is processed to obtain the amplitude information of the CSI. Different from FIFS, the present invention processes the CSI amplitude obtained by each pair of antennas to obtain the amplitude distribution of each sub-band as the characteristic fingerprint of the corresponding reference point, and the positions of all reference points and corresponding fingerprint information are jointly constructed into a fingerprint database.

[0073] In the positioning phase, the mobile device of the user to be positioned first collects CSI, and then the CSI is sent to the positioning server for the same processing as in the trai...

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Abstract

The invention discloses an indoor positioning method based on distribution of channel state information (D-CSI), which comprises a training stage and a positioning stage. In the training stage, a fingerprint database is established by using fingerprint information of each reference point location. In the positioning stage, firstly fingerprint information of the location of a user to be positioned is calculated, then a distance value between the fingerprint information of the location of the user to be positioned and the fingerprint information of each reference point location is calculated by using KL distance, and the location of the user to be positioned is acquired by using a K-nearest neighbor algorithm. The indoor positioning method makes full use of the frequency diversity between different sub-bands and the diversity between different antennas, the time stability and the space difference of a location characteristic fingerprint can be enhanced, and thus the positioning accuracy is improved.

Description

technical field [0001] The invention relates to an indoor positioning method based on channel state information distribution. Background technique [0002] In recent years, indoor positioning has attracted the attention of more and more researchers, and various technical solutions have been proposed, including Wi-Fi, Bluetooth, radio frequency identification, FM signal, sound signal, magnetic field, ultra-wideband, and light. Among these signals, even though the positioning method based on Wi-Fi signal is not as accurate as the positioning method based on proprietary equipment (such as: ActiveBAT, Cricket, etc.), due to the large deployment of wireless infrastructure equipment and the popularity of mobile devices, it is still been extensively studied. [0003] In recent years, wireless local area network (WLAN) based indoor positioning methods have received more and more attention. The physical measurement values ​​adopted by the positioning method based on WLAN include RS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04W4/04H04W4/02
CPCH04W4/025H04W4/04H04W64/006
Inventor 王建新肖亚龙张士庚王伟平
Owner CENT SOUTH UNIV
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