A Novel Carrier Suppression Method for RFID

Brauner, T.; Zhao, Xiongwen

doi:10.1109/lmwc.2009.2013676

Cited by 25 publications

(7 citation statements)

References 3 publications

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“…Moreover, the backscattered signal is pushed to the last bits of ADC due to the DLI which causes a low signal-to-interference-plus-noise ratio (SINR) [11]. In this paper, we propose a new transmission scheme that reduces the [13], [14] ✓ ✓ ✓ ✓ [15] ✓ ✓ ✓ ✓ [4], [16], [17] ✓ ✓ ✓ ✓ [18], [19] ✓ ✓ ✓ ✓ [20], [21] ✓ ✓ ✓ N/A ✓ [22] ✓ ✓ ✓ ✓ ✓ [8], [9], [23] ✓ ✓ ✓ ✓ [24] ✓ ✓ ✓ ✓ [25], [26] ✓…”

Section: A Motivationmentioning

confidence: 99%

“…Monostatic: In [20], the authors propose a front-end architecture for the reader to cancel the self-interference (SI) in a full-duplex monostatic system. In [21], the authors cancel the SI using a directional coupler and an adjustable reflective modulator. The authors of [22] propose a method to cancel the SI using the regenerated transmitted signal at the reader.…”

Section: B Review Of Previous and Related Workmentioning

confidence: 99%

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Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Kaplan

Vieira

Larsson

2024

IEEE Trans. Wireless Commun.

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Backscatter communication (BC) is a promising technique for future Internet-of-Things (IoT) owing to its low complexity, low cost, and potential for energy-efficient operation in sensor networks. There are several network infrastructure setups that can be used for BC with IoT nodes. One of them is the bistatic setup where typically there is a need for high dynamic range and high-resolution analog-to-digital converters at the reader. In this paper, we investigate a bistatic BC setup with multiple antennas. We propose a novel transmission scheme, which includes a protocol for channel estimation at the carrier emitter (CE) as well as a transmit beamformer construction that suppresses the direct link interference between the two ends of a bistatic link (namely CE and reader), and increases the detection performance of the backscatter device (BD) symbol. Further, we derive a generalized log-likelihood ratio test (GLRT) to detect the symbol/presence of the BD. We also provide an iterative algorithm to estimate the unknown parameters in the GLRT. Finally, simulation results show that the required dynamic range of the system is significantly decreased, and the detection performance of the BD symbol is increased, by the proposed algorithm compared to a system not using beamforming at the CE.

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Section: A Motivationmentioning

confidence: 99%

Section: B Review Of Previous and Related Workmentioning

confidence: 99%

Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Kaplan

Vieira

Larsson

2024

IEEE Trans. Wireless Commun.

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“…These tags can operate without any dc power supply, which means that they do not require a periodic battery replacement. Moreover, thanks to their capability to use different frequencies for the uplink and the downlink, they are robust to clutter, and they are not subject to the self-jamming problems of traditional radiofrequency identification (RFID) systems [5,6]. So, they can be placed in harsh environments and in remote areas.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Harmonic Transponder Based on On-Off Keying Modulation for Both Identification and Sensing

Palazzi

Roselli

Tentzeris

et al. 2022

Sensors

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This paper presents a novel passive Schottky-diode frequency doubler equipped with an on-off keying (OOK) modulation port to be used in harmonic transponders for both identification and sensing applications. The amplitude modulation of the second-harmonic output signal is achieved by driving a low-frequency MOSFET, which modifies the dc impedance termination of the doubler. Since the modulation signal is applied to the gate port of the transistor, no static current is drained. A proof-of-concept prototype was manufactured and tested, operating at 1.04 GHz. An on/off ratio of 23 dB was observed in the conversion loss of the doubler for an available input power of −10 dBm. The modulation port of the circuit was excited with a square wave (fm up to 15 MHz), and the measured sidebands in the spectrum featured a good agreement with the theory. Then, the doubler was connected to a harmonic antenna system and tested in a wireless experiment for fm up to 1 MHz, showing an excellent performance. Finally, an experiment was conducted where the output signal of the doubler was modulated by a reed switch used to measure the rotational speed of an electrical motor. This work opens the door to a new class of frequency doublers, suitable for ultra low-power harmonic transponders for identification and sensing applications.

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“…In order to avoid these issues and thus improve RFID readers performance, several leakage cancellation methods have been developed during the last years [2], [3], [4], [5]. These techniques have been demonstrated to remove the leakage in the receiver and performance improvements have been demonstrated [6].…”

Section: Introductionmentioning

confidence: 99%

Implementation of an adaptive leakage cancellation control for passive UHF RFID readers

Mayordomo

Bernhard

2011

2011 IEEE International Conference on RFID

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In this paper the implementation of an automatic leakage cancellation for UHF (Ultra High Frequency) RFID (Radio Frequency Identification) readers is presented. The system architecture and the control algorithms are described in detail. The proposed architecture has been completely implemented and measurements have been carried out for evaluation. The system is demonstrated to adaptively change the control signals to achieve an optimal leakage cancellation for every situation. It is shown that the Control Module keeps the leakage cancellation level between 41 dB and 46 dB, despite the leakage properties being changed by means of a phase shifter. It is also demonstrated that without such a module, the leakage power increases exponentially as the leakage properties change; e.g. from -41 dBm to -3 dBm with 30° phase shift. Finally, the system time response has been measured and the system operation has been evaluated in a reflective environment

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A Novel Carrier Suppression Method for RFID

Cited by 25 publications

References 3 publications

Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Energy-Efficient Harmonic Transponder Based on On-Off Keying Modulation for Both Identification and Sensing

Implementation of an adaptive leakage cancellation control for passive UHF RFID readers

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