Reliable reflection communication system based on channel coding

Abstract

A reliable reflection communication system based on channel coding comprises an excitation signal source, a reflection tag TAG and a receiver; a signal sent by the excitation signal source is transmitted to the receiver through the reflection tag TAG on a backscattering link; the reliable reflection communication system further comprises a WIFI transmitter, and the reflection tag TAG carries out information interaction with the receiver through the WIFI transmitter; the receiver comprises optimization processing, and the optimization processing is that the USRP RIO equipment firstly monitors an excitation channel, samples an I / Q component by setting a sampling frequency, and then calculates the duration time of a transmission state and a silence state; and finally, the duration is inputted into an optimization algorithm to obtain an optimal RS code parameter, and an index of the optimal RS code parameter is fed back to the label. The optimization algorithm comprises the steps of stream-oriented estimation, probability distribution estimation, symbol-oriented estimation and RS code optimization. According to the method and the device, through coding, by utilizing the reflected information carried on the WiFi signal, a relatively short WiFi silence period can be overcome, so that sustainable reflection transmission is realized.

Description

technical field [0001] The technical field of communication of the present invention particularly relates to a reliable reflective communication system based on channel coding. Background technique [0002] Passive reflective communication has been recognized as an effective technique for connecting Internet of Things (IoT) devices due to its extremely low energy consumption. Such as figure 1 As shown, a reflective communication system basically consists of an excitation signal source, a reflective tag TAG and a traditional receiver. In the system, a radio frequency (RF) signal (excitation signal) is transmitted from the excitation source, and the reflective tag TAG modulates the excitation signal by changing its load impedance to send data to the receiver. In short, the reflective tag TAG itself does not generate a carrier signal, but uses the carrier signal from the excitation source to send data. Therefore, the energy consumption of the reflective label TAG is extremel...

AI Technical Summary

Problems solved by technology

The discontinuity of the excitation signal will cause the packet loss rate of the reflective communication to be high, so the reflective communication is unreliable

In addition, due to the ultra-low power limit of the tag, it is difficult for the reflective tag TAG to track the change of the excitation signal and adjust its transmission strategy

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