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Method and device for decoding miller code modulated by subcarrier

A decoding method, Miller code technology, applied in the field of ultra-high frequency radio frequency identification, can solve the problems such as the decline of decoding rate and recognition rate, and achieve the effect of high decoding efficiency, simple algorithm and structure

Active Publication Date: 2015-08-05
浙江海康科技有限公司
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Problems solved by technology

Leading to a decrease in decoding rate and a decrease in recognition rate

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  • Method and device for decoding miller code modulated by subcarrier
  • Method and device for decoding miller code modulated by subcarrier
  • Method and device for decoding miller code modulated by subcarrier

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Embodiment Construction

[0038] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] To realize subcarrier modulation Miller code decoding, the main needs to be solved are waveform feature extraction, waveform period judgment, decoding, frequency offset estimation and correction, and duty cycle offset estimation and correction.

[0040] Waveform feature extraction of the subcarrier modulated Miller code: use two clocks n times the subcarrier frequency (n is generally an integer multiple of 2, and n depends on the ratio of the sampling rate to the symbol rate in the implemented system) , count the period length at the phase inversion of the Miller code, and when the count value reaches a subcarrier period, a pulse PA that is half of the subcarrier period is generated at the phase inversion.

[0041] Judgment on the waveform period of the symbol of the subcarrier modulated Miller code: use a counter CC with a clock n time...

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Abstract

The invention belongs to the technical field of ultrahigh frequency radio frequency identification (UHF RFID) and discloses a method and a device for decoding a miller code modulated by a subcarrier. The method and the device are characterized by implementing the following steps: with two clocks, counting the cycle length of a phase flipping position of the miller code and generating a pulse PA in half of one subcarrier cycle in the phase flipping position when the counting value reaches one subcarrier cycle; counting the cycle of the miller code by using another counter and generating a pulse PB when the counting value reaches the cycle of the miller code; and judging whether phase flipping pulse PA is generated in the code element cycle corresponding to the pulse PB when one pulse PB is generated; if yes, decoding the corresponding miller code into original data 1; and if not, decoding the corresponding miller code into original data o. The method and the device are simple in algorithm and structure and high in decoding efficiency.

Description

technical field [0001] The invention belongs to the technical field of ultra-high frequency radio frequency identification, and more specifically relates to a fast decoding method and decoding device for Miller codes modulated by subcarriers of ultra-high frequency radio frequency identification. Background technique [0002] The basic principle of ultra-high frequency radio frequency identification (UHF RFID) technology is to obtain and identify its information through the signal reflected by the passive target (tag). This technology is similar to the working principle of radar. [0003] UHF RFID ultra-high frequency radio frequency identification technology is the most advanced 4th generation automatic identification technology at present. Penetration of non-metallic materials and other advantages. [0004] The UHF RFID application system includes passive electronic tags, readers and back-end information systems. When the tag enters the recognition range of the reader as...

Claims

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Application Information

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IPC IPC(8): G06K7/00
Inventor 吴光荣兰信鸿李昆仑吕天剑来佳立杜红伟陈善靖陈军慧
Owner 浙江海康科技有限公司
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