Passive RFID-oriented spread spectrum and broadband perception enhancement method and system

Abstract

The invention discloses a passive RFID-oriented spread spectrum and broadband perception enhancement method and system. According to the method, customization is performed on an RFID continuous wave through employing an orthogonal frequency division multiplexing technology, so that the frequency dimension information of a perception signal is increased; through optimizing hardware characteristics, an RFID protocol and communication parameters, bandwidth is expanded, and the time resolution of a sensing signal is improved; and two feature extraction algorithms of frequency priority and time resolution priority are adopted, so that the perceptionfeatures are suitable for different scene and target requirements. According to the invention, the method only needs a single set of RFID equipment, is compatible with an RFID protocol, accords with a spectrum allocation rule, can provide high-granularity (multi-dimensional and high-speed) sensing features, has the characteristics of universality, light weight, low cost, low overhead and the like, and has relatively good application value, research prospect and development potential.

Description

Technical field [0001] The present invention belongs to the field of radio frequency identification (RFID), and in particular to a spread spectrum and broadband perceived enhancement method and system for passive RFID. Background technique [0002] In the past ten years, based on passive passive RFID's perceptual system has been highly concerned with domestic and foreign research teams and manufacturers in action identification, material testing, target positioning. However, the perception of most of the most RFID perceptions is a one-dimensional (space or frequency), low-speed (40 to 200 times per second) metric, such as the phase and intensity information of the RFID tag reply the signal physical layer. This type of feature is unable to support more finely grained sensing needs, for example, a fast action of the user with a thin-specific dilution / counterfeit / expired food, a non-contact man, and the like. [0003] In order to improve the RFID perceived particle size, a repre...

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Problems solved by technology

[0004] However, the communication conflict between multiple tags and the frequency switching delay of RFID frequency hopping mode will further reduce its perception speed, and the use of multiple tags will increase the cost input

The latest research suggests that in the RFID communication process, using additional equipment to send and receive ultra-wideband signals (500-1000MHz) can greatly improve the perception granularity, but the cost of such ultra-wideband equipment and the synchronization overhead between the two signals are still high. Difficult to generalize

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