Design and Optimization of a CDMA-Based Multi-Reader Passive UHF RFID System for Dense Scenarios

Zhi ZHANG; Zhonghai LU; Qiang CHEN; Xiaolang YAN

doi:10.1587/transcom.E95.B.206

Design and Optimization of a CDMA-Based Multi-Reader Passive UHF RFID System for Dense Scenarios

Zhi ZHANG, Zhonghai LU, Qiang CHEN, Xiaolang YAN

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In dense passive radio frequency identification (RFID) systems, code division multiple access (CDMA) techniques can be used to alleviate severe collisions and thus enhance the system performance. However, conventional CDMA techniques are challenging to implement, especially for passive tags due to cost and power constraints. In this paper, we design a CDMA-based multi-reader passive ultra high frequency (UHF) RFID system in which a reader detects only the strongest tag signal and a tag uses Gold codes only on the preamble and the data bits of RN16 without increasing its clock frequency. We present a new communication procedure based on dynamic framed slotted ALOHA (DFSA). In order to optimize the system, we theoretically analyze the system performance in terms of slot capacity and identification rate, and formally show how the code length and the number of readers affect the identification rate. Furthermore, we propose an effective method for tag estimation and frame size adjustment, and validate it via simulations. Through an example, we demonstrate how the analysis-based technique can be used to optimize the system configurations with respect to the number of readers and the number and length of Gold codes.

Publication: IEICE TRANSACTIONS on Communications Vol.E95-B No.1 pp.206-216

Publication Date: 2012/01/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E95.B.206

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Zhi ZHANG, Zhonghai LU, Qiang CHEN, Xiaolang YAN, "Design and Optimization of a CDMA-Based Multi-Reader Passive UHF RFID System for Dense Scenarios" in IEICE TRANSACTIONS on Communications, vol. E95-B, no. 1, pp. 206-216, January 2012, doi: 10.1587/transcom.E95.B.206.
Abstract: In dense passive radio frequency identification (RFID) systems, code division multiple access (CDMA) techniques can be used to alleviate severe collisions and thus enhance the system performance. However, conventional CDMA techniques are challenging to implement, especially for passive tags due to cost and power constraints. In this paper, we design a CDMA-based multi-reader passive ultra high frequency (UHF) RFID system in which a reader detects only the strongest tag signal and a tag uses Gold codes only on the preamble and the data bits of RN16 without increasing its clock frequency. We present a new communication procedure based on dynamic framed slotted ALOHA (DFSA). In order to optimize the system, we theoretically analyze the system performance in terms of slot capacity and identification rate, and formally show how the code length and the number of readers affect the identification rate. Furthermore, we propose an effective method for tag estimation and frame size adjustment, and validate it via simulations. Through an example, we demonstrate how the analysis-based technique can be used to optimize the system configurations with respect to the number of readers and the number and length of Gold codes.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.206/_p

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@ARTICLE{e95-b_1_206,
author={Zhi ZHANG, Zhonghai LU, Qiang CHEN, Xiaolang YAN, },
journal={IEICE TRANSACTIONS on Communications},
title={Design and Optimization of a CDMA-Based Multi-Reader Passive UHF RFID System for Dense Scenarios},
year={2012},
volume={E95-B},
number={1},
pages={206-216},
abstract={In dense passive radio frequency identification (RFID) systems, code division multiple access (CDMA) techniques can be used to alleviate severe collisions and thus enhance the system performance. However, conventional CDMA techniques are challenging to implement, especially for passive tags due to cost and power constraints. In this paper, we design a CDMA-based multi-reader passive ultra high frequency (UHF) RFID system in which a reader detects only the strongest tag signal and a tag uses Gold codes only on the preamble and the data bits of RN16 without increasing its clock frequency. We present a new communication procedure based on dynamic framed slotted ALOHA (DFSA). In order to optimize the system, we theoretically analyze the system performance in terms of slot capacity and identification rate, and formally show how the code length and the number of readers affect the identification rate. Furthermore, we propose an effective method for tag estimation and frame size adjustment, and validate it via simulations. Through an example, we demonstrate how the analysis-based technique can be used to optimize the system configurations with respect to the number of readers and the number and length of Gold codes.},
keywords={},
doi={10.1587/transcom.E95.B.206},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - Design and Optimization of a CDMA-Based Multi-Reader Passive UHF RFID System for Dense Scenarios
T2 - IEICE TRANSACTIONS on Communications
SP - 206
EP - 216
AU - Zhi ZHANG
AU - Zhonghai LU
AU - Qiang CHEN
AU - Xiaolang YAN
PY - 2012
DO - 10.1587/transcom.E95.B.206
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2012
AB - In dense passive radio frequency identification (RFID) systems, code division multiple access (CDMA) techniques can be used to alleviate severe collisions and thus enhance the system performance. However, conventional CDMA techniques are challenging to implement, especially for passive tags due to cost and power constraints. In this paper, we design a CDMA-based multi-reader passive ultra high frequency (UHF) RFID system in which a reader detects only the strongest tag signal and a tag uses Gold codes only on the preamble and the data bits of RN16 without increasing its clock frequency. We present a new communication procedure based on dynamic framed slotted ALOHA (DFSA). In order to optimize the system, we theoretically analyze the system performance in terms of slot capacity and identification rate, and formally show how the code length and the number of readers affect the identification rate. Furthermore, we propose an effective method for tag estimation and frame size adjustment, and validate it via simulations. Through an example, we demonstrate how the analysis-based technique can be used to optimize the system configurations with respect to the number of readers and the number and length of Gold codes.
ER -