Backscattering communication modulation method based on orthogonal frequency division multiplexing (OFMD) carriers

Abstract

The invention belongs to the technical field of communication, and relates to a backscattering communication modulation method based on orthogonal frequency division multiplexing (OFMD) carriers The modulation method provided by the invention is characterized in that the modulation method is applied to a backscattering communication system comprising a radio frequency source, a reader and a tag, and comprises the following main steps: a radio frequency source transmits an OFDM carrier signal to a tag; the tag receives the OFMD signal, the tag also comprises a backscattering antenna and a radio frequency energy collection module, the radio frequency energy collection module is used for collecting energy of the OFDM signal in a tag environment, and the backscattering antenna is used for sending information bits to the reader; and the reader receives and decodes a backscattering signal from the tag. The modulation method provided by the invention has the beneficial effects that compared with traditional designs, a specified wireless signal does not need to be sent to serve as the carrier, and higher energy efficiency, a lower bit error rate and a higher data rate can be achieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a backscatter communication modulation method based on OFDM (orthogonal frequency division multiplexing) carrier. Background technique [0002] Traditional backscatter communication systems, such as radio frequency identification (RFID) systems, generate and send radio frequency sinusoidal carrier waves to adjacent tags (Tags) through the reader (Reader) and carry tag information back to the reader. Tag circuits are usually simple and passive, so their processing capabilities are limited. like figure 1 As shown, the RFID reader sends a sinusoidal carrier wave to the tag. Part of the signal received by the tag is used for energy harvesting to meet the normal operation of the tag circuit, and the other part is used for backscattering to transmit the tag information to the reader. Since the reader needs to generate a dedicated radio frequency sinusoidal carrier, this tradition...

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Problems solved by technology

[0003] In order to solve the problems of high consumption and low energy efficiency of the traditional backscatter communication system, the present invention proposes an environmental backscatter communication technology using the radio frequency signal in the surrounding environment as the carrier

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