Method and device for testing communication bit error rate of passive ultrahigh frequency radio frequency identification system

Abstract

The invention relates to a method and a device for testing a communication bit error rate of a passive ultrahigh frequency radio frequency identification system. The testing method comprises the following steps: 1) using a reader to send a mandatory command at power Pt on the central frequency of a working frequency band of the ultrahigh frequency radio frequency identification system, wherein the Pt has to be greater than the minimal activation power of a radio frequency tag; 2) measuring and recording the maximal value and the minimal value of strength of a response signal of the radio frequency tag as RCS1 and RCS0 respectively, wherein the difference between the maximal value and the minimal value is the radar scattering cross section RCS of a reverse scattering signal of the radio frequency tag during the states 1 and 0; and 3) calculating the bit error rate of a reverse scattering link of the radio frequency tag, wherein the bit error rate is the bit error rate at the input end of a receiving machine of the reader. The invention further discloses the device for testing the communication bit error rate of the passive ultrahigh frequency radio frequency identification system. With the method and the device, the range of application is wide, the testing cost is low, and a special bit error testing instrument is not required.

Description

technical field [0001] The invention relates to a method and device for testing the bit error rate of a reverse communication link from a radio frequency tag to a reader in a passive ultra-high frequency radio frequency identification (Radio frequency identification, RFID) system. Background technique [0002] The passive UHF RFID system uses backscatter modulation technology to communicate from the radio frequency tag to the reader. The reflection coefficient of the tag is changed through the change of the chip impedance, and the response signal is modulated onto the radiated electromagnetic wave. The reader demodulates the backscatter signal of the radio frequency tag. To obtain the radio frequency tag information, the equivalent circuit of the passive UHF RFID system is as follows figure 2 , 3 shown. The performance of the passive UHF RFID system mainly includes the recognition distance and recognition rate of the system. The system recognition distance mainly depends o...

AI Technical Summary

Problems solved by technology

[0004] The existing bit error rate test system needs a dedicated bit error tester. When the system to be tested is wireless communication, it will become very difficult to connect the test port of the bit error tester to the interface of the channel to be tested, especially because the communication protocol is not timed. The test system also requires additional decoding equipment

In addition, the above test method mainly completes the test of channel bit error rate through pseudo-random sequence, and cannot complete the analysis and measurement of real-time channel quality and real-time bit error rate of the test channel. The reference value of the test is not large, and the scope of application is small.

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