UHF RFID Localization Based on Phase Evaluation of Passive Tag Arrays

Scherhäufl, Martin; Pichler, Markus; Stelzer, Andreas

doi:10.1109/tim.2014.2363578

Cited by 69 publications

(21 citation statements)

References 30 publications

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“…The ultra-high frequency (UHF) radio frequency identification (RFID) technology has been widely applied in many fields because of its advantages such as wide readable range, large information storage capacity, long recognition distance, and strong space penetration [1][2][3]. Within a direct-conversion UHF RFID reader transceiver, the analog low-pass filter (LPF) is one of the critical blocks for analog baseband signals.…”

Section: Introductionmentioning

confidence: 99%

A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter

et al. 2020

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This paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flatness respectively. Two cascaded fully-differential Tow-Thomas biquads are chosen for low sensitivity to process errors and strong resistance to the imperfection of the involved two-stage fully-differential operational amplifiers. Besides, the LPF is programmable in order to adapt to the multiple data rate standards. Measurement results show that the LPF has the programmable bandwidths of 605/870/1020/1330/1530/2150 kHz, the optimum input 1dB compression point of −7.81 dBm, and the attenuation of 50 dB at 10 times cutoff frequency, with the overall power consumption of 12.6 mW from a single supply voltage of 1.8 V. The silicon area of the LPF core is 0.17 mm2.

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Section: Introductionmentioning

confidence: 99%

A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter

et al. 2020

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“…Our previous research has confirmed that in a spatially coherent scenario (where the LoS component is dominant and where the carrier phase changes predictably over distance), a distributed antenna array and direct localization algorithms can achieve localization accuracy much better than the carrier wavelength (by two to three orders of magnitude). In [ 35 ], it was reported that accuracy of 30% of carrier wavelength in RFID (radio frequency identification) localization was achieved. Localization in a spatially coherent scenario was also addressed in [ 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Position estimation with a millimeter-wave massive MIMO system based on distributed steerable phased antenna arrays

Vukmirović

Janjic

Djurić

et al. 2018

EURASIP J. Adv. Signal Process.

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In this paper, we propose a massive MIMO (multiple-input-multiple-output) architecture with distributed steerable phased antenna subarrays for position estimation in the mmWave range. We also propose localization algorithms and a multistage/multiresolution search strategy that resolve the problem of high side lobes, which is inherent in spatially coherent localization. The proposed system is intended for use in line-of-sight indoor environments. Time synchronization between the transmitter and the receiving system is not required, and the algorithms can also be applied to a multiuser scenario. The simulation results for the line-of-sight-only and specular multipath scenarios show that the localization error is only a small fraction of the carrier wavelength and that it can be achieved under reasonable system parameters including signal-to-noise ratios, antenna number/placement, and subarray apertures. The proposed concept has the potential of significantly improving the capacity and spectral/energy efficiency of future mmWave massive MIMO systems.

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“…• A moving reader (e.g., carried by a robot) using reference tags [23], • An array of tags [24], • Tags using a reader equipped with multiple antennas [25,26], • Tags using multiple interrogations on difference radio channels [20,27], and, of course, combination of the previous ones (e.g., localization of a tag using multiple antennas and multiple radio channels).…”

Section: Introductionmentioning

confidence: 99%

On phase-based localization with narrowband backscatter signals

Decarli

2018

EURASIP J. Adv. Signal Process.

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Backscatter communication is widely adopted for radio-frequency identification (RFID). Recently, the possibility of localizing passive tags or readers, exploiting phase measurements from backscatter signals, received large attention. In particular, several applications with standard ultra-high frequency (UHF) RFID were proposed, thanks to the availability of the phase information in many commercial readers, without requiring any hardware modification. In this paper, the problem of localizing a tag or a reader using phase measurements is addressed from the estimation theory point of view. The derived structure for the maximum likelihood estimator is compared with other approaches proposed in the literature, showing its enhanced performance in a typical application context.

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UHF RFID Localization Based on Phase Evaluation of Passive Tag Arrays

Cited by 69 publications

References 30 publications

A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter

A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter

Position estimation with a millimeter-wave massive MIMO system based on distributed steerable phased antenna arrays

On phase-based localization with narrowband backscatter signals

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