Bluetooth backscattering method

Abstract

The invention discloses a Bluetooth backscattering method. The method comprises the following steps: enabling a radio frequency source to transmit a carrier signal; absorbing and storing the energy of the carrier signal in the capacitor; when the voltage of the capacitor is greater than or equal to a preset value, waking up the tag, taking the capacitor as a power supply, and mixing a square wave signal generated by the tag with the carrier signal to form a reflection signal, wherein a fundamental wave of the reflection signal falls on a correct Bluetooth broadcast signal. In the method, the label does not need a battery.

Description

technical field [0001] The invention belongs to the technical field of radio frequency and relates to a Bluetooth backscattering method. Background technique [0002] With the rapid development of Internet of Things (IoT) applications, "low power consumption" as an important indicator has been paid more and more attention. As a communication protocol commonly carried by smartphones, Bluetooth has a very high penetration rate. Therefore, if a new device is compatible with the Bluetooth protocol, the cost of the receiver will be greatly reduced, and it will be easier to be connected to the market. However, traditional Bluetooth requires devices to generate 2.4GHz signals, and the power consumption is still high. Therefore, Backscatter technology (Backscatter), with its ultra-low power consumption characteristics, is very likely to become the core technology used by IoT devices for communication. At the same time, from the perspective of improving maintainability and enhancing...

AI Technical Summary

Problems solved by technology

For example, the patent application number 201911102141.3 proposes a passive backscatter long-distance communication system, which realizes battery-free communication, but due to the use of a large capacitor, the charging time is as long as 20 minutes, and the response is not sensitive enough

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