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A Method for Determining the Threshold Value of the Reader and Writer of the Environmental Backscattering System

A backscattering and determination method technology, applied in the direction of instruments, inductive recording carriers, computer components, etc., can solve the problems of limited distance, low reliability, and wrong transmission, so as to reduce the error rate and improve reliability Effect

Inactive Publication Date: 2018-06-26
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of traditional backscattering technology is: limited by distance
However, this method is not reliable, the transmission rate is low, and the differential detection is easy to cause error propagation (Error propagation)

Method used

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  • A Method for Determining the Threshold Value of the Reader and Writer of the Environmental Backscattering System
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  • A Method for Determining the Threshold Value of the Reader and Writer of the Environmental Backscattering System

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Embodiment Construction

[0068] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0069] The method for determining the threshold value of the reader / writer of the environmental backscatter system provided in this embodiment includes the following steps:

[0070] S1: Use a radio frequency source to emit radio frequency signals to its surrounding environment;

[0071] The expression of the source RF signal is:

[0072]

[0073] where x 0 (t) is the source radio frequency signal emitted by the radio frequency source to its surrounding environment; f c,s is the carrier frequency of the radio frequenc...

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Abstract

The invention discloses a threshold determining method of a reader-writer of an ambient backscatter system. The method comprises the following steps: emitting source radio frequency signals to a surrounding environment by use of a radio frequency source; receiving the source radio frequency signals from the radio frequency source by use of an electronic tag; receiving the source radio frequency signals from the radio frequency source, radio frequency signals reflected by the electronic tag and noise signals in environment by use of the reader-writer; the reader-writer demodulating the actually received radio frequency signals; by use of the reader-writer, calculating average power of N continuous radio frequency signals which are demodulated by the reader-writer; respectively obtaining probability distribution functions of the average power of the N continuous radio frequency signals which are demodulated by the reader-writer when the electronic tag is at a non-reflection state and a reflection state; respectively calculating an error bit rate when the electronic labels are at the reflection state or the non-reflection state; and respectively obtaining a first threshold and a second threshold of the reader-writer. The determining method provided by the invention can reduce the error rate of ambient backscatter.

Description

technical field [0001] The invention relates to the technical field of wireless network radio frequency identification. More specifically, it relates to a method for determining the threshold value of a reader / writer of an environmental backscattering system. Background technique [0002] In the past 20 years, radio frequency identification (Radio Frequency Identification, RFID) systems have attracted widespread attention from academia and industry. A typical RFID system consists of a reader (Reader) and a tag (Tag), using backscatter (Backscatter) technology for communication. First, the reader sends a radio frequency signal to the tag, and the tag receives the signal and loads its own information, and then reflects it back to the reader. It can be said that the backscattering technology is the key technology of the RFID system, and it is one of the signs that the RFID system is different from other wireless communication systems such as point-to-point and cooperative (Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 王公仆卢康
Owner BEIJING JIAOTONG UNIV
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