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Indoor wireless locating method based on wireless local area network WLAN OFDM signal cyclic prefix

A wireless local area network and cyclic prefix technology, applied in the field of indoor wireless positioning, can solve the problems of poor algorithm stability and large positioning error.

Active Publication Date: 2015-03-25
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide an indoor wireless positioning method based on the cyclic prefix of a wireless local area network WLAN OFDM signal, aiming to solve the problems of large positioning errors and poor algorithm stability in the existing indoor wireless positioning method based on RSSI

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  • Indoor wireless locating method based on wireless local area network WLAN OFDM signal cyclic prefix
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  • Indoor wireless locating method based on wireless local area network WLAN OFDM signal cyclic prefix

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[0052] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0053] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0054] Such as figure 1 As shown, the indoor wireless positioning method based on the cyclic prefix of the wireless local area network WLAN OFDM signal in the embodiment of the present invention includes the following steps:

[0055] S101: The node to be positioned samples the received signal to obtain a sampled signal;

[0056] S102: Construct a correlation window, and obtain the maximum value of the logarithmic likelihood function by sliding the correlation w...

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Abstract

The invention discloses an indoor wireless locating method based on the wireless local area network WLAN OFDM signal cyclic prefix. The method includes the steps that a node to be located samples a receiving signal to obtain a sampling signal; a correlation window is built, the maximum value of a log-likelihood function is obtained by sliding the correlation window, and the initial position of an OFDM symbol is obtained; a cross-correlation value of the OFDM symbol is computed according to the initial position of the OFDM symbol; the distance between the node to be located and an anchor node is computed according to a log-distance path loss model; coordinates of the node to be located is estimated according to a self-adaptive distance correcting algorithm. By means of the method, the location error of a system under the extremely low signal-to-noise ratio and the complex multipath channel environment is lowered, and the locating accuracy and stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an indoor wireless positioning method based on a cyclic prefix of a wireless local area network (WLAN) OFDM signal. Background technique [0002] In recent years, with the rapid development of Wireless Local Area Networks (WLAN), the demand for indoor wireless positioning services has increased rapidly, and indoor wireless positioning technology has been widely and deeply applied in public services, public safety and business fields. However, because the signal penetrates through many buildings and the attenuation is serious, and the indoor environment is complex, the signal is affected by obstacles when it propagates indoors, which will cause multipath effects, shadow occlusion and noise interference, etc., resulting in a greatly reduced positioning accuracy, and even a Large positioning blind spots. Therefore, traditional outdoor wireless positioning...

Claims

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Application Information

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IPC IPC(8): H04W64/00H04L27/26
CPCH04L27/2602H04W64/00
Inventor 王勇周建宫丰奎葛建华
Owner XIDIAN UNIV
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