RFID signal miller decoding method under low signal-to-noise ratio

A low signal-to-noise ratio and decoding method technology, applied in the field of RFID signal MILLER decoding, can solve the problem of low communication efficiency, achieve low signal-to-noise ratio, stable work, and filter out signal glitches

Active Publication Date: 2018-09-04
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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Problems solved by technology

[0005] The purpose of the invention of the present invention is: in order to solve the problem of low communication efficiency of the MILLER decoding method in the prior art under the condition of low signal-to-noise ratio, the present invention proposes a RFID signal MILLER decoding method under low signal-to-noise ratio

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  • RFID signal miller decoding method under low signal-to-noise ratio

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[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0020] like figure 1 As shown, it is a schematic flowchart of the MILLER decoding method for an RFID signal with a low signal-to-noise ratio of the present invention. A MILLER decoding method for an RFID signal under a low signal-to-noise ratio, comprising the following steps:

[0021] A. Obtain tag signal data;

[0022] B. Decompose the MILLER code into orthogonal primitives 1 and 0, set the high-level matched filter coefficient in the baseband waveform to 1, and the low-level matched filter coefficient to -1, and combine the label return signal with the standard primitive Real-time ma...

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Abstract

The invention discloses an MILLER decoding method for an RFID signal at a low signal to noise ratio. The method comprises the steps: obtaining label signal data; carrying out the matching filtering; identifying an extreme value; identifying a lead code signal; carrying out the MILLER decoding; judging the receiving state of a single code element; judging the data type of a label return signal; and judging the receiving state of the label data. The method enables an MILLER code to be divided into orthogonal elements '1' and '2' serving as matching templates, carries out the matching filtering with the data returned by a label in real time, and decodes the data returned by the label through combining with the position of the matching filtering extreme value and the duration tolerance of the single code element. The method employs a matching filtering decoding mode of elements, and the delayed time is just the duration of a half of one element. The method judges the condition that the label is ended, enables a reader to be capable of adaptively decoding the label data with the indefinite length, and does not need to configure the receiving length. The method can effectively filter the interference from signal burr and distortion, guarantees the real-time communication between the reader and the label, and enables the reader to be able to work reliably and stably at a lower signal to noise ratio.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to a MILLER decoding method of an RFID signal under a low signal-to-noise ratio. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology realized by radio frequency communication. [0003] MILLER encoding, the symbol "0" is a high level or a low level without phase inversion in the middle of the bit window, and the phase is inverted between two adjacent symbols "0"; the symbol "1" exists in the middle of the bit window. One phase inversion, and no phase inversion occurs between two adjacent symbols "1". If the tag data information in the RFID technology adopts MILLER encoding, the reader will enable MILLER decoding accordingly. [0004] When the reader and the tag communicate, the signal is easily damaged by electromagnetic interference and noise, and the MILLER symbol wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/10G06K7/00H03M5/04
CPCG06K7/0008G06K7/10009H03M5/04
Inventor 杨林陈青华谢箭许志伟贺文娟
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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