RFID System Optimization Deployment Research And Application

Radio Frequency Identification is an automatically and contactless technology that uses radio waves communication. Recently, because of its especial advantages, RFID technology is widely applied in many fields. With further progress of RFID technology, there will be a trend of application of large-scale RFID systems. Due to the limited range inherent read-to-tag communication, readers must be deployed in high densities over the entire area, in order to cover a large area of the region. In this case, the deployment of RFID readers becomes the most important issue to be considered of large-scale applications:How to effectively use every reader’s coverage capacity, reasonably plan the location of each reader, appropriately configure parameters of them, and then put them together to build a large-scale readers network. By solving this difficult problem, not only can the equipment cost be saved to enhance economic efficiency, but also reader conflicts and label conflicts caused by RF signal coverage overlap between readers can be reduced, and improve overall system performance. To the best of our knowledge, there has only been a very limited of number of researches in the literature addressing this issue.This paper studies dense environment RFID reader area covering deployment problem, and the specific work is as follows:(1) For constant probability static deployment, respectively on circular and elliptical cover model are analyzed. When the cover model for oval, can use honeycomb theory of classic covering strategy, formation of hexagon cover, the distance between two nodes for communication radius of three times as much as the root. And when the cover model for the oval, the first assume that a reader and other reader of communication between the coverage area of the node coordinates, and the point of tangency surrounded the trapezoidal area, and the formula derivation, and the other derivative is zero, then find out the optimal covering different reader coverage area between node coordinates.(2) Put forward improved particle swarm algorithm, genetic algorithm is introduced to the variation mechanism of particle swarm algorithm, to ensure the diversity of population. At the same time, puts forward the coverage index, load balance index and signal interference index normalized function, for elliptic cover model and round cover problems in a lot of experimental simulation. The experimental results show that the proposed deployment model can effectively calculation any RFID reader deployment scene of coverage and overlap rate, and calculates the load distribution.(3) Based on the nRF24LE1chip, design2.4GHz reader and tag chip, the practical application deployment. Compared with the nRF24L01, tablet on the RF system RF circuit and controller combined with, have better convenient volume and flexibility, facilitate the realization of small label. And use the reader and tags to the actual deployment simulation and design a warehouse management system.