Analysis of Dead Zone by Mathematical Methods

Zhao, Hongsheng

doi:10.1109/wicom.2011.6040569

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…This simple model only considers two waves, whereas in a typical environment many paths between transmitting and receiving antenna can contribute to the signal at a certain position. A similar model for UHF RFID, treating one direct wave and one wave reflected at the floor, is discussed in [27]. However, other authors find that a two ray model is not sufficient to be representative for a real environment [28].…”

Section: Multipath Fadingmentioning

confidence: 99%

An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

et al. 2019

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Ultra high frequency radio frequency identification (UHF RFID) is seen as a key technology for future sensor and actuator devices in the Internet of Things. Therefore, improvements of read range and reliability of this technology is highly demanded. In this paper a novel reader is proposed to work on two frequencies simultaneously, intended to improve multipath fading behavior and gain immunity to narrowband disturbance. The current legal situation is reviewed for the proposed device in the European Union and it is compared to existing multifrequency systems. The developed system is based on a software defined radio platform from National Instruments. In the measurement setup a commercially available transponder chip has been connected to the custom built reader which transmits a ''Query'' command on two frequencies −868 MHz and 915 MHz. The results show, that the transponder replies on both channels. Further measurements in a real world multipath environment show the different fading behaviour of the chosen frequencies. Furthermore, it is demonstrated how dead zones can be avoided by using two different frequencies. Additionally, within the reader software a bitwise error correction for FM0 encoded data is implemented, which employs the redundant information on the two carriers. We are able show that a multicarrier system can be implemented with commercially available tags without restrictions in the European Union. Such a system could be used to improve successful read rates in harsh environments or increase reliability in critical applications. When upgrading from an existing UHF RFID system, only the interrogator needs to be exchanged by a new device working on multiple frequencies.

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Section: Multipath Fadingmentioning

confidence: 99%

An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

et al. 2019

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Hemispheric coverage multi-beam switched antenna array using a 4-port feeding network for UHF RFID dead zone avoidance

Lee

Khang

Lee

et al. 2013

2013 Asia-Pacific Microwave Conference Proceedings (APMC)

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Tracking with RFID asynchronous measurements by particle filtering

Bugallo

Djurić

2013

2013 IEEE International Conference on Acoustics, Speech and Signal Processing

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This paper deals with the problem of real-time indoor tracking of tagged objects in Ultra High Frequency Radio Frequency Identification systems with asynchronous measurements. A new and more realistic model of the system is proposed, where the probability of detecting a tag by a reader is described by a function of both the distance and the angle between the tag and the reader's antenna. The model also accounts for the possibility of a tag being in a dead-zone where the tag cannot be detected. For tracking, we propose the use of the particle filtering methodology that takes into account the asynchronous nature of the measurements. The parameters for modeling the resulting system are obtained from realworld experiments and the performance of the algorithm is shown by extensive computer simulations.

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Analysis of Dead Zone by Mathematical Methods

Cited by 5 publications

References 5 publications

An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

An Experimental Study on the Feasibility of a Frequency Diverse UHF RFID System

Hemispheric coverage multi-beam switched antenna array using a 4-port feeding network for UHF RFID dead zone avoidance

Tracking with RFID asynchronous measurements by particle filtering

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