Deployment Strategy And Implementation Of Integrated UHF RFID And WSN Network Nodes

The technology of Radio Frequency Identification(RFID) and wireless sensor networks(WSN) is widely used respectively, and the network node which integrate the RFID and WSN can easily transfer and processing of critical data and information.The traditional solution of the integrated approach is to combine the specific RFID chip with the WSN, but the high prices of the specific RFID reader chip is not conducive to the application of low-cost occasions; In addition, the current deployment strategy of the integrated network is deployed randomly which have the low efficiency and high resource costs. In summary, the researches of the low-cost integrated network node implementations and its deployment strategy have the important scientific significance and practical value. The main work is shown as follows:First of all, the RFID technology and wireless sensor technology, communication protocols, RF front-end solution of UHF system, and the current integrate technology of RFID and WSN were analyzed firstly. To solve the costly defect problem of dedicated UHF RFID reader chip which used in the traditional integrated network node, a low cost program of integrated network node which based on FPGA and universal wireless transceiver chip is proposed in this thesis. In this program, the digital baseband circuit of the RFID system is designed based on FPGA, and the driver layer, protocol layer and the application layer of the RFID system are designed based on Nios II. The digital baseband signal is loaded onto the universal wireless transceiver chip through the SPI interface, and the modulation of the digital baseband signal is completed by the universal wireless transceiver chip, taking into account the limited transmit power RF transceiver chip, this program use a power amplifier for amplifying the RF signal power in the last part of the circuit.Secondly, in order to improve the deploy efficiency of the integrated network nodes, an integrated network nodes location deployed algorithm based on improved artificial bee colony algorithm is proposed in the thesis. The algorithm is improved the defect of the basic artificial bee colony algorithm by introducing cross mechanism,in the deployment algorithm, the deployment problem of the network node which based on the signal model is transmitted into the optimization problem of ensuring high coverage and low interference of the node firstly, and then the improved artificial bee colony algorithm is used to optimize the objective function of the node deployment. Simulation results show that the algorithm not only can find the global best position to deploy but also reduce interference between the integrated networknodes quickly and accurately under the premise of the largest coverage effectively of RFID.Finally, the multi-stage test of the integrated network nodes was implemented to verify the accuracy of the integrated network node design, the test results show that:the proposed architecture of the FPGA-based integrated network node realization is feasible, and the Hardware algorithm has good advantages of high efficiency, high speed, and portability, and it will have a huge market potential in the future of the Io T era.