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Wireless positioning method by utilizing circulating prefix (CP)

A cyclic prefix and wireless positioning technology, which is applied in the positioning of wireless communication systems and the positioning of wireless signal communication equipment, can solve the problems of poor real-time performance and high cost of positioning, and achieve simple implementation, reduced cost, and low computational complexity Effect

Inactive Publication Date: 2014-06-18
WUXI WEISITENG INFORMATION TECH
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Problems solved by technology

However, this method needs to establish a large-capacity data channel from each base station to the central node, which is very costly and has poor real-time positioning

Method used

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  • Wireless positioning method by utilizing circulating prefix (CP)
  • Wireless positioning method by utilizing circulating prefix (CP)
  • Wireless positioning method by utilizing circulating prefix (CP)

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0028] Such as figure 1As shown, the present invention utilizes wireless signals transmitted by target sites received by multiple positioning base stations for positioning. There is no communication between the target site and the positioning base station, so the base station does not know the details of the signal transmitted by the target site. The target station is a station or a mobile terminal that communicates in a wireless manner. The communication signal format of the target site has a cyclic prefix, such as LTE, wireless LAN 802.11a / g / n, terrestrial digital broadcasting DVB-T, etc.

[0029] Such as figure 2 As shown, the positioning base station first obtains the communication system of the target signal through information such as the frequency point and bandwidth of the target signal, and then determines the symbol length and CP length...

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Abstract

The invention provides a wireless positioning method based on time difference of arrival (TDOA).According to the method, the relative time information that a target station reaches base stations is directly calculated by utilizing the self-correlation characteristic of a circulating prefix (CP) existing in a tuning signal transmitted by a present communication system, and then the specific position of a target is calculated by a central node by utilizing time information measured by each positioning base station. The method is implemented according to the following steps: firstly, the length of a symbol and the length of the CP in a signal are determined according to the characteristics of a signal transmitted by a positioning target; secondly, self-correlation computation is performed by utilizing the self-correlation characteristic of the CP; the relative time for the target station to reach each positioning base station is obtained according to the time corresponding to the peak of the self-correlation computation; lastly, the actual position of the target is obtained by adopting the TDOA positioning algorithm according to the relative time information. Compared with the traditional method, the positioning method disclosed by the invention is easy to implement, low in computing complexity and capable of realizing real-time positioning and tracking.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and signal processing, relates to positioning in a wireless communication system, and mainly aims at positioning a communication device transmitting a wireless signal with a cyclic redundant prefix. Background technique [0002] Wireless positioning technology uses the parameters of the received radio signal to obtain positioning information, and then uses an appropriate positioning algorithm to calculate the position of the target. Wireless positioning technology is divided into many types according to the parameters of the obtained signal and the structure of the positioning system. No matter which positioning technology is used, the basic principle is similar, that is, by measuring the radio signals transmitted and received by the target to estimate the target and the surrounding area. Know the relative geometric relationship of the position base station (or access point, satelli...

Claims

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Application Information

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IPC IPC(8): H04W64/00
Inventor 张华
Owner WUXI WEISITENG INFORMATION TECH
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