Near-field magnetic wafer full-duplex unauthorized magnetic communication method

Abstract

The invention provides a near-field magnetic wafer full-duplex unauthorized magnetic communication method. According to the method, a magnetic wafer composed of an excitation coil and a tunnel magnetoresistive sensor located in the center is used as a function module and a transmitting and receiving antenna on the two sides of a control center, and simultaneous same-frequency full duplex data acquisition is completed by means of a short-distance strong coupling electromagnetic field transmission medium. Firstly, a double-side modulation module takes a modulation signal as excitation coil current input, a same-frequency induction magnetic field is generated in a magnetic wafer space, a tunnel magnetoresistive sensor receives a magnetic signal, and electric signal near-magnetic channel gain is analyzed; secondly, near-magnetic channel gains at the positions of the tunnel magnetoresistive sensors on the two sides are obtained through a self-interference channel estimation module, and self-interference signals on the self-magnetic wafer side are reconstructed; and the self-interference elimination module eliminates the self-interference signal from the received signal and demodulates the demand data. According to the method, on the premise that the transmission rate is guaranteed, the two-way transmission duration is shortened to be half of the original duration, and the problem of data exchange reliability caused by equipment cableless module scheduling time delay is solved.

Description

technical field [0001] The invention belongs to the field of short-range communication design, and mainly relates to the wireless communication design of equipment functional units and a control center, in particular to an unlicensed near-field full-duplex communication method based on an electromagnetic field. Background technique [0002] The magnetic communication method using the electromagnetic field as the transmission medium has the characteristics of high short-range transmission rate and controllable magnetic coupling anti-interference. It is an important technology to achieve wireless data transmission between internal functional modules and control centers without relying on frequency band authorization. It has attracted extensive attention from organizations such as China and the International Telecommunication Union. However, in the existing near-field half-duplex magnetic communication technology using the energized coil as the transceiver antenna, the rate cou...

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Problems solved by technology

[0003] The present invention provides an electromagnetic field-based near-field full-duplex unauthorized communication method to overcome the low data transmission rate between a large number of functional modules of large-scale equipment and a control center under the realistic background of limited total amount of time-frequency resources in the prior art , The real-time nature of information interaction is low, and the transmission reliability is insufficient

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