Research On The Fused And Enhanced Anti-collision Algorithm In UHF RFID Systems

Under the national strategy background of the Internet Plus and Network Power,the development of the Internet of Things(IoT)has been highly concerned by all levels of the country.As the core driving technology of the Internet of Things,RFID(Radio Frequency Identification)has been listed as one of the ten important technologies in the twenty-first century.However,there are still a lot of unsolved key problems in basic technology research for its application.Passive UHF(ultra high frequency)RFID system has its advantages of high data rate,long recognition distance,strong anti-interference,low cost,long service life,small size,multi target recognition and so on,thus it has been widely concerned.The anti-collision algorithm is the key technology of passive UHF RFID system,and its performance directly affects the normal operation of the whole system.The existing anti-collision algorithms still have many shortcomings on performance indexes such as throughput,communication and transmission time.Therefore,it is very important to study the passive UHF RFID anti-collision algorithm for these deficiencies.The main research contents of this paper include the following three points:(1)The basic composition,structure and working principle of important electromagnetic field and control process of IOT passive UHF RFID system and the anti-collision algorithm,the common algorithm is mainly the following three types: Aloha based probabilistic algorithm in binary query tree based deterministic algorithm,Aloha and fusion binary tree algorithm,which combines Aloha algorithm and binary query tree based on the basis of the previous two algorithms,the new algorithm and its shortcomings and put forward.(2)In order to improve the shortcomings of the existing RFID anti-collision algorithm,at the same time in order to improve the performance of RFID,based on the fusion algorithm,we proposed an enhanced algorithm,and the conclusion shows that the RFID throughput data,tag communication amount,the number of iterations and successfully read tags correct estimation rate simulation etal,are all better than other algorithms.(3)For the imperfect part of fusion algorithm two binary query tree and Aloha algorithm based on the proposed fusion prediction test algorithm,and simulation,the result shows that the passive UHF RFID system frequency response efficiency stability,throughput data,communication content,communication and system efficiency are increased,meanwhile complexity is decreased.To sum up,two new algorithms are proposed and simulated in this paper.Compared with other anti-collision algorithms,all the communication quality indicators are better,which achieves the goal of improving the performance of UHF RFID system.