The main objective of Radio Frequency Identification (RFID) systems is to provide fast identification for tagged objects. The noteworthy advantage of RFID technology, is its capability to identify objects simultaneously. However, when radio frequency signals are emitted simultaneously, there is a probability of collision occurrence, and thereby resulting in a waste of resources. Collision is a time-consuming event that reduces the performance of RFID systems. Consequently, several anti-collision algorithms have been proposed in the literature, attempt to decrease the collision occurrence probability. In almost all the existing anti-collision algorithms, a prior knowledge of the number of tags has a significant role in the efficiency of the algorithms. Since the real number of tags is unknown, it needs to be estimated. Therefore, the more accurate estimation method results in more efficient identification process. Although, there are some proposed estimation methods in previous researches, almost all of them suffer from either the low accuracy level or high computational complexity. Moreover, most of the existing estimation methods assume the reader and tags communication channel as an error free channel. Hence, in the real communication environment, which is error-prone, their results are not trustworthy. In this presentation we will focus on a general introduction for Anti-Collision algorithms and tag estimation methods to present the advantages and disadvantages of existing methods.
- Anti-Collision Algorithm,
- Tag Estimation Method
Available at: http://works.bepress.com/shakiba/11/