| Radio Frequency Identification (RFID) technology is an auto-identification technology emerging in the 90s. Applying radio frequency (RF) to perform contactless two-way communication to identify and exchange data. With its'unique contactlessness, great interference resistance,etc., RFID has already become one of the most outstanding and commonly-used auto-identification technologies.This paper states RFID system's basic concepts, working principles and related standards. It is mainly focusing on PFID reader's key receiving technologies and its'realization solution.Based on the theories, this paper designs the reader system realization program as per the request of EPC Global Class 1 Generation 2. Choosing TI's TMS320VC5509ADSP as its'baseband processor, AD's AD73660 as ADC conversion chip, this progarm realizes the system by using of embedded C language and assembly language, including PIE coding, FM0 decoding, signal integrity test, signal denoising, filter shaping. Also this paper proposes using anti-collision algorithm to solve the collision problem when multiple transponders sends data simultaneously and occupies the channel. In this paper, by researching algorithms like time division multiplexing (TDM) ALOHA and slotted ALOHA, it concludes to an improved algorithm names dynamic frame slotted ALOHA.At the end of this paper, aiming at the features of RFID system, this paper develops a detailed test program to debug and test the designed system. And the test program proves the system can complete basic simple communication between the reader and tag in multi-tag environment, read the data on a specific tag and display the data in the host computer. But due to the limitation of conditions, some functions cannot be fully developed, however, without any doubt, this study lays a solid foundation for the system's future development. |
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