Decoder and decoding method of RFID receiver

Abstract

The invention discloses a decoder of an RFID receiver, comprising an input end from which data are input, an output end from which decoded data are output and a zero-crossing detection module; wherein, the zero-crossing detection module comprises a counting unit, a coding unit and a decoding unit; the counting unit is used for counting the data input from the input end; the coding unit is used forcoding in accordance with the simplified storage format based on the output of the counting unit; the decoding unit is used for decoding the data subjected to real-time bi-phase space coding in the coding unit and outputting the decoded data from the output end. The invention also discloses a decoding method of the RFID receiver. The invention adopts the simplified storage format for coding the data, thereby dispensing with storing all the data, realizing real-time decoding and reducing consumption of hardware resources while solving the response time. The decoder is small and exquisite in structure and can be embedded into mobile phones for use.

Description

technical field [0001] The invention relates to an RFID reader-writer, in particular to a decoder and a decoding method for an RFID receiver. Background technique [0002] Today, with the rapid development of informatization, RFID (Radio Frequency Identification) technology has become a mainstream technology, and it has been widely used in logistics, libraries, medical care, etc., which has also promoted the RFID system industry. development of. The basic subsystems of the RFID system include: readers, tags and antennas. At the receiving end of the reader, after the signal reflected by the tag is demodulated by the carrier of the analog front end, it is sampled by the ADC (Analog to Digital Converter: analog-to-digital converter), and the original signal is restored by filtering, phase recovery, decoding and other modules , and then the protocol processing unit recognizes the command, so as to make corresponding operations. [0003] Common receiver decoding methods (such ...

AI Technical Summary

Problems solved by technology

[0003] General receiver decoding methods (such as maximum likelihood estimation and interpolation filtering) are not suitable for RFID systems because the response time cannot meet the requirements.

Two-step correlation demodulation method, such as figure 1 As shown, it is a decoding method that can accurately capture the return signal with a large frequency deviation, and the response speed can also meet the requirements, but because more correlators and higher sampling rates are needed in exchange for high frequency resolution , the consumption of hardware resources is very large, which cannot meet the power consumption and volume requirements of portable RFID readers

Images