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Phase distance calculation method based on channel state information

A channel state information and calculation method technology, applied in the field of phase distance calculation, to achieve the effect of easy code implementation, simplified ranging algorithm, and not easy to deform

Pending Publication Date: 2021-07-09
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] In view of the problems existing in the above-mentioned background technology, the present invention proposes a phase distance calculation method based on channel state information, so as to realize phase distance calculation with better effect in the case of large environmental interference or complex space

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  • Phase distance calculation method based on channel state information
  • Phase distance calculation method based on channel state information
  • Phase distance calculation method based on channel state information

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Embodiment Construction

[0033] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Step 1, start the wireless router, and use a wireless device that supports 802.11n protocol to connect to the router. Use the tools in your wireless router to get channel state information. Read the status information of each subcarrier. Using Euler's formula, the channel state information is converted from complex number form to complex exponential form. Get the individual subcarrier phase values ​​in complex exponential form. Perform 2kπ phase compensation for adjacent subcarriers with 2π jumps, such as figure 2 shown. For the obtained subcarrier data, the subcarrier number is used as the x-axis coordinate value, and the phase value of the subcarrier is used as the y-axis coordinate value. In the coordinate system, the corresponding points are plotted to obtain a phase-frequency relationship point diagram.

[0035] St...

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Abstract

The invention discloses a phase distance calculation method based on channel state information, which is used for performing distance calculation under a single wireless router by using a phase calculation method. Compared with a traditional distance calculation method, main calculation data of the method are phase information of electromagnetic waves, and compared with amplitude information, the phase information is not prone to deformation in the propagation process, and meanwhile, the influence of equipment gain does not need to be considered. The invention provides a simplified distance calculation method, and the channel state information is acquired and calculated for multiple times, so mutual offset between errors is realized, codes are easier to realize, and the method can be used as an executable program to run on various devices.

Description

technical field [0001] The invention belongs to the field of wireless communication and geographical positioning, and in particular relates to a distance calculation method based on phase of channel state information. Background technique [0002] The 802.11n protocol in the IEEE protocol proposes an orthogonal frequency division multiplexing technology, which enables wireless devices to analyze the state values ​​of all sub-carrier channels, so that various propagation parameters of electromagnetic waves can be calculated mathematically. Among them, the time-of-flight parameters used to calculate the distance between devices are included. [0003] In the current wireless positioning technology, such as a method for estimating the direct path angle of arrival (CN202010332308.1), the general method is to use the antenna array to obtain CSI, and then use the improved super-resolution MUSIC algorithm to construct the spatial spectrum function, and then divide the angle and dist...

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Application Information

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IPC IPC(8): H04W4/02
CPCH04W4/023Y02D30/70
Inventor 张载龙马大禹
Owner NANJING UNIV OF POSTS & TELECOMM
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