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Tensor decomposition-based channel state information positioning fingerprint construction method

A channel state information and positioning fingerprint technology, which is applied in the directions of location information-based services, specific environment-based services, and special data processing applications.

Active Publication Date: 2020-10-09
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Wi-Fi-based indoor positioning methods mainly obtain CSI through personal computers. At present, there are few studies on using smart phones to obtain CSI for positioning. For the first time, Schulz et al. proposed to use Nexmon firmware patch on mobile devices to modify Wi-Fi firmware. And build a Wi-Fi test platform to extract CSI

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  • Tensor decomposition-based channel state information positioning fingerprint construction method
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  • Tensor decomposition-based channel state information positioning fingerprint construction method

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[0031] specific implementation plan

[0032] The present invention will be further described below in conjunction with accompanying drawing:

[0033] Such as figure 1 The shown method for constructing channel state information location fingerprints based on tensor decomposition specifically includes the following steps:

[0034] Step 1, expressing the collected original channel state information (Channel State Information, CSI) data as a three-dimensional image with the subcarrier sequence on the X axis, the time stamp on the Y axis, and the CSI amplitude on the Z axis;

[0035] Step 2. Treat the 3D image obtained in Step 1 as a third-order tensor and express it via a linear combination of rank tensors as in, and is the unit vector obtained by decomposing the r-th rank tensor in the three dimensions of the image; the symbol Represents the outer product operation of vectors; λ r is the component singular value of the r-th rank tensor, which describes the proportion ...

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Abstract

The invention discloses a tensor decomposition-based channel state information positioning fingerprint construction method. The method comprises the following steps of: firstly, expressing acquired channel state information (CSI) data as a three-dimensional image; regarding the three-dimensional image as a third-order tensor; then, combining a tensor decomposition algorithm based on a Parallet Factor (PARAFAC) analysis model and an ALS (Alternate Least Squares) iterative algorithm for noise reduction processing of the tensor; then, carrying out single-layer tensor wavelet decomposition on three dimensions of the CSI image by using a tensor wavelet decomposition algorithm, and calculating wavelet coefficients of wavelet sub-components by using an angular second moment; and finally, obtaining the CSI positioning fingerprint corresponding to each reference point coordinate. According to the method, the characteristic that high-order tensors can describe data information and structures isfully utilized, complex data is expressed in a tensor form, noise reduction and feature extraction of tensor images are finally achieved, and the data processing and analyzing capacity is improved.

Description

technical field [0001] The invention belongs to indoor positioning technology, in particular to a channel state information positioning fingerprint construction method based on tensor decomposition. Background technique [0002] With the gradual development of the mobile Internet era to the Internet of Things era, location-based services (Location-based Service, LBS) have become more and more widely used in people's lives. Currently popular wireless positioning systems include Global Positioning System (Global Position System, GPS), cellular positioning system, Bluetooth positioning system, radio frequency identification positioning system, ZigBee positioning system and WLAN positioning system. Among them, the GPS positioning system is the most common because it has better performance in the field of outdoor positioning. However, in the indoor environment, due to the occlusion of various obstacles and moving objects, the satellite signal attenuation is very serious, which m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W4/021H04W4/33G06F17/14
CPCH04W4/021H04W4/023H04W4/33G06F17/148
Inventor 周牧龙玥辛谢良波聂伟王勇何维
Owner CHONGQING UNIV OF POSTS & TELECOMM
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