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RFID Read Rate and Coverage Improvement through reader power control

*Abstract: In radio frequency identification (RFID) systems, the detection range and read rates will suffer from interference among high power reading devices. This problem grows severely and degrades system performance in dense RFID networks. Consequently, medium access protocols (MAC) protocols are needed for such networks to assess and provide access to the channel so that tags can be read accurately. In this paper, we investigate a suite of feasible power control schemes to ensure overall coverage area of the system while maintaining a desired read rate. The power control scheme and MAC protocol dynamically adjusts the RFID reader power output in response to the interference level seen during tag reading and acceptable signal-to-noise ratio (SNR). We present novel distributed adaptive power control (DAPC) and probabilistic power control (PPC) as two possible solutions. A suitable back off scheme is also added with DAPC to improve coverage. Both the methodology and implementation of the schemes are presented, simulated, compared and discussed for further work.

*Principal Investigation: Name: Jagannathan Sarangapani, Professor
Department:

Name: Kainan Cha
Department:

Name: Anil Ramachandran
Department:

Name: Can Saygin
Department:

附加资料: Inventor: Sarangapani, Jagannathan | Ramachandran, Anil | Saygin, Can | Cha, Kainan
Priority Number: US8143996B2
IPC Current: H04Q000522 | G08B001314 | G08B002600 | H04B000700 | H04W000400
US Class: 3400102 | 340505 | 3405721 | 4550412 | 455466
Assignee Applicant: The Curators of the University of Missouri,Rolla
Title: Decentralized radio frequency identification system
Usefulness: Decentralized radio frequency identification system
Summary: Decentralized radio frequency identification (RFID) system for providing a decentralized power control scheme to adaptively adjust the power of an RFID reader in a network of readers communicating with an RFID tag.
Novelty: Decentralized radio frequency identification (RFID) system for adjusting power of RFID reader has processor that executes instructions to adjust transmission power level of carrier signals as a function of measured degree of interference

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