Time-frequency synchronization method of magnetic resonant coupling simultaneous wireless information and power transfer system

A wireless energy-carrying communication and magnetic resonance coupling technology, which is applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems affecting communication system performance, subcarrier crosstalk, subcarrier phase deflection, etc. Frequency overhead and signal processing complexity, the effect of high-precision time-frequency joint synchronization

Active Publication Date: 2018-06-08
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

In an OFDM system, the timing and frequency offsets at both ends of the transceiver will cause phase deviation of subcarriers and crosstalk between subcarriers, thus affecting the performance of the communication system
Common wireless communication systems use transmitted pilots for time-frequency joint synchronization, and calculate timing and frequency offsets based on received pilot signals, but this method increases pilot overhead and signal processing complexity

Method used

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  • Time-frequency synchronization method of magnetic resonant coupling simultaneous wireless information and power transfer system

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Embodiment Construction

[0017] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0018] A time-frequency joint synchronization method of a magnetic resonance coupling wireless energy-carrying communication system according to the present invention, referring to figure 1 , in the primary circuit, the AC voltage input from the power grid is converted into a stable DC voltage by the rectifier filter circuit, and then the high-frequency AC voltage is output by the high-frequency inverter circuit, and the high-frequency AC voltage is coupled into the phase-locked loop by the transformer to generate frequency The clock signal is generated by the device, and the clock signal is input to the communication module of the primary circuit for up-down sampling and up-down conversion. The signal generated by the communication module is coupled to the power transmission channel through a transformer, and the high-frequency AC voltage and co...

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Abstract

The invention discloses a time-frequency synchronization method of a magnetic resonant coupling simultaneous wireless information and power transfer system, a high-frequency alternating current voltage resonant signal of a power transfer channel is coupled to be input into a phase-locked loop frequency generator through a transformer to generate a clock signal of a communication module, thus, homology of clocks at a receiving end and a transmitting end of simultaneous wireless information and power transfer is realized, and time-frequency synchronization of the receiving end and the transmitting end is achieved. The method provided by the invention is free from transmitting and receiving pilot signals to calculate timing and frequency deviation, thus, pilot frequency overhead and signal processing complexity are reduced, high-precision time-frequency synchronization is achieved, and system performance is improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic resonance coupling wireless energy carrying communication, and in particular relates to a time-frequency joint synchronization method of a magnetic resonance coupling wireless energy carrying communication system. Background technique [0002] Magnetic resonance coupling power transmission technology is a non-contact power transmission technology based on the principle of electromagnetic induction coupling. The power transmission process has the characteristics of safety, reliability and flexibility, and is especially suitable for use in some humid, flammable and explosive conditions. There is a great tendency to replace the traditional cable power supply mode, and it has been successfully applied in electric vehicles, biomedical electricity, household appliances, oil drilling and other fields. However, in many practical applications, we still need to use this power transmission channel to comple...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2671H04L27/2672
Inventor张秀军赵明肖立民
OwnerTSINGHUA UNIV