Environment backscattering system and signal transmission method thereof

Abstract

The invention provides a signal transmission and detection method of an environment backscattering system; the system comprises an environment radio source for emitting a source radio frequency signal, a label for receiving the source radial signal and reflecting the radio frequency signal and a reader for receiving the source radio frequency signal and the radio signal, wherein the label continuously emits an equiprobable binary character loaded on the source radio frequency signal; the binary character is corresponding to if the label reflects the radio frequency signal; the reader judges if the received signal is the binary character emitted by the label on the basis of a maximum likelihood detection method or a joint energy detection method. The method is simple in practice, good in performance, and very strong in practicability.

Description

technical field [0001] The present invention relates to the field of communication technologies, and more particularly, to an environmental retroreflection system and a signal transmission method thereof. Background technique [0002] The Internet of Things is an important part of the new generation of information technology. However, the Internet of Things has not been widely used so far. The key bottleneck restricting the development of the Internet of Things is that these devices with batteries will be constrained by energy problems, so there will be limited energy consumption. Service life, huge maintenance costs and other issues. [0003] A solution that does not rely on the energy source embedded in the device is to harvest energy from the environment, such as light energy, mechanical energy, and the ubiquitous electromagnetic energy. Ambient RF signals such as broadcast TV, mobile phone and WIFI signals have been widely used for energy harvesting, and the recovered e...

AI Technical Summary

Problems solved by technology

[0006] At present, most of the research work is mainly focused on the design of the hardware circuit of the environmental backscatter system and the display and evaluation of the hardware prototype, and there is no basic analysis of the system

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