The application of multiport theory for MIMO RFID backscatter channel measurements

authored by: Eckhard Denicke, Malte Henning, Hanno Rabe, Bernd Geck
Abstract: This contribution deals with channel measurements in multiple-input multiple-output radio-frequency identification systems (MIMO RFID). Herein, multiple antennas are applied at the reader and at the RFID tag as well. A method for the determination of the channel coefficients between all antennas is presented. The channel information is needed to apply MIMO techniques to enhance the data rate or the reliability or range of the backscatter link. Since no measurement can be conducted at the tag antenna ports the method is based on the theory of determining the scattering parameters of a multiport (n-port) with a reduced number of measurement ports. Herein, the load impedances within the RFID tag being normally used to transmit information via backscatter modulation are used as known reflection standards. An internal thru standard between the tag antenna ports is introduced to reduce phase ambiguities. The method could be applied in future generations of multi-antenna RFID tags or could be used to characterize the channel for MIMO RFID prototype systems to evaluate their performance limits e.g. by calculating the MIMO capacity. Measurement results for the proposed method for a system with two reader transmit and receive and two tag antennas (2×2×2) are presented (5 to 6 GHz).
Organisation(s): Institute of Microwave and Wireless Systems
Type: Conference contribution
Pages: 522-525
No. of pages: 4
Publication date: 2012
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electrical and Electronic Engineering
Electronic version(s): https://doi.org/10.23919/eumc.2012.6459123 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{33d8d0fbf82a43439adf7fbea9c3405f,
title = "The application of multiport theory for MIMO RFID backscatter channel measurements",
abstract = "This contribution deals with channel measurements in multiple-input multiple-output radio-frequency identification systems (MIMO RFID). Herein, multiple antennas are applied at the reader and at the RFID tag as well. A method for the determination of the channel coefficients between all antennas is presented. The channel information is needed to apply MIMO techniques to enhance the data rate or the reliability or range of the backscatter link. Since no measurement can be conducted at the tag antenna ports the method is based on the theory of determining the scattering parameters of a multiport (n-port) with a reduced number of measurement ports. Herein, the load impedances within the RFID tag being normally used to transmit information via backscatter modulation are used as known reflection standards. An internal thru standard between the tag antenna ports is introduced to reduce phase ambiguities. The method could be applied in future generations of multi-antenna RFID tags or could be used to characterize the channel for MIMO RFID prototype systems to evaluate their performance limits e.g. by calculating the MIMO capacity. Measurement results for the proposed method for a system with two reader transmit and receive and two tag antennas (2×2×2) are presented (5 to 6 GHz).",
keywords = "channel measurements, MIMO, multiport, n-port, port reduction method, RFID",
author = "Eckhard Denicke and Malte Henning and Hanno Rabe and Bernd Geck",
year = "2012",
doi = "10.23919/eumc.2012.6459123",
language = "English",
isbn = "9782874870279",
series = "European Microwave Week 2012: {"}Space for Microwaves{"}, EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012",
publisher = "IEEE Computer Society",
pages = "522--525",
booktitle = "European Microwave Week 2012",
address = "United States",
note = "2012 42nd European Microwave Conference, EuMC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 ; Conference date: 29-10-2012 Through 01-11-2012",
}