Dynamic Framed Slotted ALOHA (DFSA) is one of the most popular protocols to resolve tag collisions in RFID systems. In DFSA, it is widely known that the optimal performance is achieved when the frame size is equal to the number of tags. So, a reader dynamically adjusts the next frame size according to the current number of tags. Thus it is important to estimate the number of tags exactly. In th...

The next generation RFID system for ubiquitous identification and sensing requires both energy and system efficiency. This paper describes an efficient passive RFID system using impulse ultra-wideband radio (IR-UWB), at a 10m operation range. Unlike conventional passive RFID systems which rely on backscatter and narrowband radio, IR-UWB is introduced as the uplink (communication from a tag to a...

Radio frequency identification (RFID) is a wireless communication technology that provides automatic identification and data collection. In the application of RFID systems with large number of tags, many tags may respond to the reader in the same time. Thus, enhanced anti-collision algorithms are required to have fast multiple tag identification process. Thus, several anti-collision algorithms ...

In an active RFID based wireless localization system, usually a number of RFID readers are required to generate localization beacon broadcasts from which a RFID tag can collect multiple RSSI measurements and forward them to a localization server for calculating the location of the tag. Such operations should be done from time to time when the tag is moving. Collisions may happen at the tag if t...

Dynamic framed slotted ALOHA (DFSA) protocol has been widely used in many RFID systems. According to the information from last frame (e.g. the number of idle, success and collision slots), DFSA dynamically adjusts the next frame size so as to reach higher identification efficiency. The process is known as tag estimation of DFSA. Similar to most existing tag anti-collision protocols, The DFSA in...

To raise the RFID UHF reader’s performance, a test environment must be established. Using a lot of real tags to establish a test bed may induce some demerits, such as high resources costs and so on. So some institutions which engaged in RFID research developed some simulation systems for algorithm designing to provide reference information and technical support. 1. TI Gen2 standard tag simulato...

As the adoption of the radio-frequency identification (RFID) technology is increasing, many applications require a dense reader deployment. In such environments, reader-to-reader interference becomes a critical problem, so the proposal of effective anti-collision algorithms and their analysis are particularly important. Existing reader-to-reader anti-collision algorithms are typically analyzed ...

The technology of Radio Frequency IDentification (RFID) enables many applications that rely on passive, battery–less wireless devices. If a RFID reader needs to gather the ID from multiple tags in its range, then it needs to run an anti–collision protocol. Due to errors on the wireless link, a single reader session, which contains one full execution of the anti–collision protocol, may not be su...

In large-scale Internet of Things (IoT) applications, tags are attached to items, and users use a radiofrequency identification (RFID) reader quickly identify obtain the corresponding item information. Since multiple share same channel communicate with reader, when they respond simultaneously, tag collision will occur, cannot successfully information from tag. To cope problem, ultrahigh frequen...