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A method for eliminating phase error in CSI measurement between devices based on two-way interaction

A phase error, inter-device technology, applied in transmission monitoring, digital transmission systems, electrical components, etc., can solve problems such as inapplicability, and achieve the effect of simple method, elimination of hardware phase error, and small amount of calculation.

Active Publication Date: 2021-07-27
南京荣飞科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these algorithms are only applicable to the field of angle estimation
Not suitable for direct ToF measurement field

Method used

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  • A method for eliminating phase error in CSI measurement between devices based on two-way interaction
  • A method for eliminating phase error in CSI measurement between devices based on two-way interaction
  • A method for eliminating phase error in CSI measurement between devices based on two-way interaction

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] like figure 1 As shown, a WiFi ToF ranging and positioning system based on channel state information includes a base station and a mobile point. The base station includes a WiFi module, and the WiFi module is connected to a CSI extraction module. The WiFi module is connected to the CSI extraction module. For signal transmission, the CSI extraction module is connected to a device transmission phase error elimination module, and the CSI extraction module is connected to the device transmission phase error elimination module for one-way signal transmission, and the device transmission phase error elimination module is connected to a phase extraction and a subcarrier phase Error elimination module, the device transmits the phase error elimination module to the phase extraction and subcarrier phase error elimination module for one-way signa...

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Abstract

The invention discloses a method for eliminating phase error in CSI measurement between devices based on two-way interaction, and proposes a two-way interaction method, which cooperates with a high-precision clock, so that the two-way error CSI value at the same time can be obtained, and by calculating two opposite CSI values , to offset the two-way equipment error contained in CSI. The calculation amount of the communication error elimination in the present invention is small, and the method is simple. The eliminated error is the most influential error in practical applications, and it is the key error to realize ToF ranging.

Description

technical field [0001] The invention relates to the technical field of phase ranging, in particular to a method for eliminating phase errors in CSI measurement between devices based on two-way interaction. Background technique [0002] CSI channel state information has gradually become an important technology for high-precision WiFi recognition and perception because it can describe a complete wireless signal transmission model. In particular, the phase signal extracted by the CSI can more accurately describe the transmission change of the wireless signal. [0003] However, in the real environment, the phase signal is subject to many interferences. For example, the clock error of the WiFi module will cause a phase delay error when receiving the signal, and the signal sending devices such as the WiFi signal modulation module and antenna will have hardware error offsets, etc. Wait. Due to these errors in the actual environment, the phase value extracted by CSI will be almost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B17/391H04L27/26
CPCH04B7/0413H04L27/2627H04L27/2668H04B17/391
Inventor 邵力斌
Owner 南京荣飞科技股份有限公司