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Novel positioning fingerprint design method and indoor positioning system based on channel estimation

A positioning fingerprint and channel estimation technology, applied in baseband system components, wireless communications, advanced technologies, etc., can solve problems such as high computational complexity and long sampling time, and achieve improved positioning accuracy, enhanced reliability, and enhanced effects. Effect

Active Publication Date: 2013-09-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

EESM maps the signal-to-noise ratio of different subcarriers of OFDM in the WLAN channel to an exponentially equivalent signal-to-noise ratio, which is used as a characterization of the characteristics of the WLAN channel. It draws on the basic principle of using the RSS power spectrum as a fingerprint with a more stable variance At the same time, EESM can be directly extracted by the channel estimation module in the OFDM system, which overcomes the shortcomings of too long sampling time and high computational complexity when calculating the RSS power spectrum, making it possible to apply this new type of fingerprint to the actual positioning system

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  • Novel positioning fingerprint design method and indoor positioning system based on channel estimation
  • Novel positioning fingerprint design method and indoor positioning system based on channel estimation
  • Novel positioning fingerprint design method and indoor positioning system based on channel estimation

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[0051] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0052] Such as figure 1 As shown, the indoor positioning system is divided into offline mode and online mode. In the offline mode, the main purpose is to establish the fingerprint database of the target positioning area. Divide the target area. If the positioning accuracy is required to be 3m, the divided area should be smaller than 3×3m. When measuring the fingerprint of the reference point, the exponential effective signal-to-noise ratio map (EESM) generated by channel estimation is used as th...

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Abstract

The invention provides a novel positioning fingerprint design method and an indoor positioning system based on channel estimation. EESM (Exponential Effective SIR Mapping) is adopted as fingerprint information. EESM is to map signal to noise ratios of different subcarriers of OFDM (orthogonal frequency division multiplexing) in a WLAN (wireless local area network) channel into an exponential-equivalent signal to noise ratio which is used as representation of WLAN channel characteristics, and the fundamental principle that RSS (received signal strength) power spectra are used as fingerprints to obtain more stable variance is used for reference; meanwhile, the EESM in an OFDM system can be directly extracted by a signal estimation module, the defects of too long sampling time and high computation complexity during RSS power spectra computation are overcome, and accordingly applying the novel fingerprints to actual positioning systems is possible. Further, by the novel positioning fingerprints, precision and stability of the indoor positioning system are improved.

Description

technical field [0001] The invention relates to an indoor positioning system design method in the field of communication technology, in particular to a wireless local area network-based positioning fingerprint extraction and an indoor positioning system design method based on the fingerprint. Background technique [0002] With the development of smart terminal technology and the rise of location-based Internet services (Location Based Service, LBS), research on indoor positioning technology has attracted more and more attention. As a basic technology, indoor positioning technology can provide location information of smart terminals or users carrying smart terminals. This location information can be used to help consumers in large shopping malls guide shopping, locate elderly patients in medical centers, and track needs Children in special care. In indoor environments, especially in large shopping malls or public places, a large number of WLAN access points (Access Point, AP...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/04H04W64/00H04L25/02
CPCY02D30/70
Inventor 黄正勇王帆俞晖葛志邦奚望
Owner SHANGHAI JIAO TONG UNIV
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