Active RFID System With Spread-Spectrum Transmission

Mazurek, Gustaw

doi:10.1109/tase.2008.917091

Cited by 26 publications

(13 citation statements)

References 20 publications

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“…The ideal S-ALOHA and EBFSA are adopted for comparisons, i.e., the reader is assumed to know the exact tag number. CDMA based schemes are expected to separate tag collisions [10]. We include CDMA-ALOHA RFID identification in Figure 3, where each tag randomly selects a Walsh code to spread its data and randomly selects a slot to send the spread data.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The delay of the most widely adopted schemes, tree splitting and S-ALOHA [1,6] and their improved versions [10] are about 2N to 3N slots. Compared with them, as long as K < 2N, Ogrid is more efficient.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Each tag with a unique ID is attached to an object. The reader queries the tag to get its ID and thereby identifies the object [1][2][3][4][5][6][7][8][9][10]. The scanning period to identify all tags is preferred to be as short as possible.…”

Section: Introductionmentioning

confidence: 99%

“…In tree based protocols, when a collision happens, the colliding tags split into smaller groups, and the tags in each group sends their IDs in one of the two subsequent slots. Also, some work [10] applies code division multiple access (CDMA) technique to RFID, since CDMA in nature has the ability of separating colliding signals. However, a much wider frequency band is required in a CDMA system.…”

Section: Introductionmentioning

confidence: 99%

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Multiple tags identification for short id rfid networks

Guo

Leung

2012

2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems

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Utilization of radio frequency identification (RFID) tags to localize objects in real time requires the collection of the identities (IDs) of the tags within a short time. This paper presents a novel orthogonal group identification (Ogrid) method that addresses the above requirement. When queried, multiple tags with mutually orthogonal IDs respond, such that these tag IDs can be separated at the reader without using spread spectrum technique. Ogrid yields a small and fixed identification delays for any given tag ID size B . Ogrid is especially suitable for dense networks where the tag ID sizes are relatively short. In the case of B = 16 bits, which supports at most 65536 tags, Ogrid incurs a fixed identification delay of about 4 seconds regardless of the number of tags present, whereas several existing protocols incur average delays of 20 and 100 seconds to identify 10,000 and 50,000 tags, respectively. Results for a dynamic system with tag arrivals and departures further demonstrate the consistently low identification delay of Ogrid.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiple tags identification for short id rfid networks

Guo

Leung

2012

2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems

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“…However, these signals conflict with signals from other sensors because action RFID tags cannot cooperate with other sensors [7]. The application of spread spectrum communication to active tags has been proposed in order to address this problem [8]. Spread spectrum communication is known to be resistant to interference.…”

Section: Introductionmentioning

confidence: 99%

A Method to Assign Spread Codes Based on Passive RFID Communication for Energy Harvesting Wireless Sensors Using Spread Spectrum Transmission

Takahashi¹,

Inoue²,

Kawakita³

et al. 2015

Proceedings of the 12th EAI International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services

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Considerable research has been conducted on systems that collect real-world information by using numerous energy harvesting wireless sensors. The sensors need to be tiny, cheap, and consume ultra-low energy. However, such sensors have some functional limits, including being restricted to wireless communication transmission. Therefore, when more than one sensor simultaneously transmits information in these systems, the receiver may not be able to demodulate if the sensors cannot accommodate multiple access. To solve this problem, a number of proposals have been made based on spread spectrum technologies for resistance to interference. In this paper, we point out some problems regarding the application of such sensors, and explain the assumption of spread codes assignment based on passive radio frequency identification (RFID) communication. During the spread codes assignment, the system cannot work. Hence, efficient assignment method is more appropriate. We consider two assignment methods and assessed them in terms of total assignment time through an experiment. The results show the total assignment time in case of Electronic Product Code (EPC) Global Class-1 Generation-2 which is an international standard for wireless protocols and the relationship between the ratio of the time taken by the read/write command and the ratio of total assignment time by the two methods. This implies that more efficient methods are obtained by considering the time ratio of read/write command.

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Innovative Quick Response Programs in Logistics and Supply Chain Management

Cheng

Choi

2010

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Active RFID System With Spread-Spectrum Transmission

Cited by 26 publications

References 20 publications

Multiple tags identification for short id rfid networks

Multiple tags identification for short id rfid networks

A Method to Assign Spread Codes Based on Passive RFID Communication for Energy Harvesting Wireless Sensors Using Spread Spectrum Transmission

Innovative Quick Response Programs in Logistics and Supply Chain Management

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