Supercharge Your Innovation With Domain-Expert AI Agents!

RFID system backward link carrier interference elimination method

A technology of backward link and carrier interference, which is applied in the field of wireless radio frequency, and can solve the problem of low receiver sensitivity of the reader

Inactive Publication Date: 2015-11-11
SHANGHAI UNIV
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the above two methods, the receiver sensitivity of the reader is not high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • RFID system backward link carrier interference elimination method
  • RFID system backward link carrier interference elimination method
  • RFID system backward link carrier interference elimination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a device for eliminating carrier interference in the reverse link of an RFID system includes an antenna, a polyphase filter, a power amplifier with controllable magnification, a first and a second adder, a residual interference carrier detection module and a control circuit ;

[0044] The transmitter couples the forward carrier signal and inputs it to the polyphase filter, and the polyphase filter shifts the forward carrier signal by 0° / 90° / 180° / 270° to generate an in-phase The same phase signal, the same phase and opposite phase signal, the quadrature same phase signal and the quadrature opposite phase signal; the same phase signal of the same phase, the same phase and opposite phase signal, the quadrature same phase signal and the quadrature and opposite phase signal are amplified by the power amplifier Then output to the first adder; the control circuit is set according to the preset gain adjustment range and the adjustment step size of th...

Embodiment 2

[0046] Such as figure 2 As shown, a method for eliminating the carrier interference of the RFID system backward link is composed of the following specific steps:

[0047] Step 1: Initialization: Set the warning residual amount of the residual carrier signal, and set the same phase signal I in the same phase as the forward carrier signal + (t), same phase and opposite phase Q + (t) signal, quadrature same phase signal I - (t) and quadrature opposite phase signal Q - (t) gain range and gain step size;

[0048] Step 2: Establish a configuration point: the configuration of the configuration point is (N I+ , N I- , N Q+ , N Q- ), N I+ , N I- , N Q+ , N Q- Respectively in-phase and same-phase signal I + (t), same phase and opposite phase Q + (t) signal, quadrature same phase signal I - (t) and quadrature opposite phase signal Q - The gain of (t) is the in-phase and same-phase signal I of the forward carrier signal + (t), same phase and opposite phase Q + (t) signal...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an RFID system backward link carrier interference elimination device and method. The device comprises an antenna, a multiphase filter, an amplification-time-controllable power amplifier, first and second adders, a residual interference carrier detection module and a control circuit. The method comprises the steps of initialization, establishment of configuration points, generation of offset signals, confirmation of the optimal elimination point and judgment of whether residual carrier signals are less than the set warning residual quantity. If the judgment result is yes, gain of the power amplifier set; and if the judgment result is no, the configuration points are updated, and the optimal elimination point is searched near the current optimal elimination point in a fine manner. Carrier interference existing in a backward link is offset by coupling of forward link carrier so that degree of isolation of a transmitting path and a receiving path is effectively enhanced, forward carrier signals included in the receiving path are ensured to be low as far as possible, and sensitivity of a receiver is enhanced.

Description

technical field [0001] The invention relates to a device and method for eliminating wave interference, in particular to a device and method for eliminating the carrier interference of the reverse link of an RFID system, and belongs to the field of wireless radio frequency technology. Background technique [0002] The radio frequency identification technology (RFID) system is mainly composed of three parts: reader, tag, and background server. The identification process is mainly divided into three parts: the reader transmits the carrier, the tag reflects the received carrier after activation, and the reader identifies the carrier reflected by the tag. A general reader uses a single-antenna structure, which is connected to the transmission path and the reception path at the same time, and the carrier interference from the transmission path to the reception path is isolated through isolation devices such as directional couplers or circulators. However, the isolation of the dir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L25/03
Inventor 陈文涛彭章友李忠建王淼王春娜李林霄朱晶华
Owner SHANGHAI UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com