The Research On Optimization Of Perceptual Links Technology In Passive System

The wide application of the Internet of Things has provided more convenience for people's daily life and put forward higher requirements for RFID.Passively computable RFID tags are equipped with a microprocessor to give the tags the ability to calculate,and external sensors allow the tags to function as intelligent nodes.This series of changes makes new tags not only have the function of simple object recognition,but also a microcosm of IntelliSense.Although the birth of passive CRFID tags has provided more possibilities for equipment,there are still some thorny problems.In terms of data transmission,the environment in which a passive system is located is complex and changeable.Therefore,information is often sent in a wrong state.In order to solve this problem,it is necessary to improve the data verification retransmission mechanism and improve the reliability and stability of data transmission.On the other hand,passive CRFID is very sensitive to perceived quality due to the presence of microprocessors and sensors.Therefore,the overall improvement of the tag performance requires continuous improvement of the tag design and some reasonable mechanisms.In order to improve the defects in the above two aspects,passive CRFID is studied in this paper.In order to improve the reliability of data transmission,a new data retransmission mechanism is designed.The information retransmitted multiple times is stored in the buffer.In the case of transmission failure,the data that is jointly transmitted for multiple times is used for data verification to reduce the number of data retransmissions,which provides a condition for passive CRFID to be used in more complex environments.In verifying the proposed mechanism,the effectiveness of the proposed mechanism was verified by constructing a transmission system and comparing the different aspects of the original retransmission mechanism and the improved retransmission mechanism.On the other hand,in order to better evaluate the communication quality of the uplink-aware link,the impact of backscatter technology on passive CRFID communication was explored by establishing an equivalent model of CRFID.Under the condition of ensuring accurate communication,the theoretical model of perceived distance in CRFID is further obtained,which provides a new idea for improving the performance of uplink aware links.Finally,through comparison experiments on the passive CRFID experimental platform,the correctness and validity of the proposed theoretical model are verified.