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Near-field wireless communication method of vortex electromagnetic wave based on circular coil array

A technology of vortex electromagnetic wave and communication method, which is applied in the field of short-distance wireless communication and vortex electromagnetic wave near-field wireless communication, and can solve problems such as long-distance crosstalk, attenuation, and difficulty in supporting communication applications.

Active Publication Date: 2021-09-10
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the current near-field mutual induction wireless communication NFC has transmission capacity bottlenecks and serious crosstalk problems in various channels of the multi-coil system, which makes it difficult to support communication applications that require high data transmission rates in the future; and vortex electromagnetic wave wireless communication technology is mainly used in optical communication And RF communication scenarios, and its application has the problems of difficult alignment of transceiver antennas, long-distance crosstalk and serious attenuation, and there is no application in the field of mutual induction near-field communication

Method used

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  • Near-field wireless communication method of vortex electromagnetic wave based on circular coil array
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  • Near-field wireless communication method of vortex electromagnetic wave based on circular coil array

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Experimental program
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Effect test

Embodiment 1

[0049] Due to protocol and frequency band limitations, there is currently a transmission capacity bottleneck in near-field mutual induction wireless communication NFC; and there are serious crosstalk problems in each channel of the multi-coil near-field mutual induction communication system, which makes it difficult for near-field mutual induction wireless communication NFC to support future high-data Communication applications that require transmission rates; and vortex electromagnetic wave wireless communication technology is mainly used in optical communication and radio frequency RF communication frequency bands. Because this technology has high requirements for the alignment of transceiver antennas, there are currently engineering technical difficulties in the above frequency bands. The present invention conducts research and exploration on the current situation, tries to overcome crosstalk and improve channel capacity, and proposes a vortex electromagnetic wave near-field ...

Embodiment 2

[0081] The vortex electromagnetic wave near-field wireless communication method based on the coil circle array is the same as that in Embodiment 1, the establishment of a three-dimensional Cartesian coordinate system described in step (2) of the present invention, and the determination of each coil number and coordinate position specifically include:

[0082] 2.1) Take the direction connecting the center of the circular array of transmitting coils to the center of any transmitting coil as the x-axis, and the direction of the axis of the circular array of transmitting coils as the z-axis, determine the y-axis according to the right-hand spiral rule, and establish a three-dimensional space Cartesian coordinate system.

[0083] 2.2) The numbering method is: number the transmitting coil and the receiving coil respectively in a clockwise or counterclockwise order; wherein, the numbering of the transmitting coil is: 0≤n≤N t -1, the receiving coil number is: 0≤m≤N r -1.

[0084] 2.3...

Embodiment 3

[0094] The vortex electromagnetic wave near-field wireless communication method based on the coil circle array is the same as embodiment 1-2, and the calculation of the mutual inductance matrix M between the transmitting and receiving coils and the mutual inductance matrix M between the transmitting coils described in the step (3) of the present invention s , the specific process is as follows:

[0095] N t Each transmitting coil has radius r t A circular coil with turns K t ; said N r Each transmitting coil has radius r r A circular coil with turns K r . Each element in the mutual inductance matrix M and M s The calculation methods of non-diagonal elements in are as follows:

[0096]

[0097] where M 2,1 Indicates the mutual inductance between the coil numbered 1 and the coil numbered 2. For M, number 1 corresponds to the number of the transmitting coil, and number 2 corresponds to the coordinates of the receiving coil; for M s , No. 1 and No. 2 respectively corre...

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Abstract

The invention discloses a vortex electromagnetic wave near-field wireless communication method based on a coil circle array, combined with vortex electromagnetic wave wireless communication technology, solves the multi-coil crosstalk problem of multi-coil near-field mutual inductance communication, and breaks through the traditional NFC capacity bottleneck. The technical solution includes: establishing a coordinate system, determining the coil number and coordinates; calculating the mutual inductance matrix of the transmitting and receiving coils and the mutual inductance matrix of the transmitting coil; calculating the OAM-NFC channel matrix; determining the excitation of the transmitting coil; receiving and separating the OAM-NFC signal; Signal judgment realizes short-distance vortex mutual induction communication. Based on OAM-NFC channel modeling, the present invention solves the problem of mutual inductance and crosstalk between transmitting coils and greatly improves the capacity of the NFC system compared with the MIMO-NFC system without additional use of more orthogonal resources such as bandwidth. Applied to short-range wireless communication such as near-field streaming media transmission requiring high-speed data transmission and high-resolution fingerprint transmission identification.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and mainly relates to electromagnetic wave near-field wireless communication, in particular to a vortex electromagnetic wave near-field wireless communication method based on a coil circle array, which is mainly used for short-distance wireless communication. Background technique [0002] Near Field Communication (NFC) technology evolved from Radio Frequency Identification (RFID) technology is famous for its low power consumption and simplicity. NFC physical transmission is based on the mutual inductance effect between coils, and the transmission distance is short (<4cm), so it is often used in contactless payment, access control and other security-related fields, and is also used to establish other complex links in the early connection establishment data exchange Scenes. However, the lower transmission rate limits the application of NFC in some future scenarios that require hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B5/00
CPCH04B5/0025H04B5/0081
Inventor 程文驰吕润宇秦凡张海林
Owner XIDIAN UNIV
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