Automatic leaking carrier canceller adjustment techniques

Lasser, Gregor; Langwieser, Robert; Mecklenbräuker, Christoph F.

doi:10.1186/1687-3963-2013-8

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…In addition, it is suitable for scenarios with ideal ambient noise and circuit noise [24]. On the other hand, the local search algorithm puts less requirement on the power detector as long as it shows a monotone but not necessarily linear input-output relation [25]. So, the design requirements of the power detector can be appropriately relaxed.…”

Section: Self-jammer Cancellation Algorithmmentioning

confidence: 99%

A Fully Integrated Passive Self-Jamming Cancellation Architecture with Fast Settling Time for UHF RFID Reader

Chen

Jiang

et al. 2022

Electronics

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This paper presents a fully integrated passive self-jamming cancellation (SJC) circuit in 0.18 µmComplementary Metal Oxide Semiconductor (CMOS) technology for ultra-high frequency (UHF) radio frequency identification (RFID) applications. Based on the active amplitude and phase control, a novel passive variable capacitor array and signal combiner are adopted instead of a traditional variable amplifier/attenuator and a phase shifter to reduce the circuit complexity and thus achieve higher linearity and low noise. We use an improved cancellation algorithm based on the local search method to quickly and accurately find the cancellation point that minimizes the self-jamming signal power. The simulation and measurement results are constant, and a suppression of 38 dB can be achieved in the working frequency of 860–960 MHz. The cancellation algorithm can be finished within 0.5 ms. These results indicate that the designed SJC circuit can be a promising candidate for UHF RFID applications.

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Section: Self-jammer Cancellation Algorithmmentioning

confidence: 99%

A Fully Integrated Passive Self-Jamming Cancellation Architecture with Fast Settling Time for UHF RFID Reader

Chen

Jiang

et al. 2022

Electronics

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“…If the cancellation level has only a single maximum in the dynamic range of Vi and Vq, the algorithm is able to achieve a desired cancellation level C below this maximum, using a standard iterative gradient search method [8] with line search optimization.…”

Section: B Cancellation Algorithmmentioning

confidence: 99%

Feed-Forward Technique to Measure the Reflection Coefficient Under CW High-Power Signals

Collado

Gonzalez-Rodriguez

Gonzalez-Arbesu

et al. 2018

IEEE Trans. Microwave Theory Techn.

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This paper describes a measurement setup to obtain the reflection coefficient response over the frequency of a given device when this is subject to a single tone high-power signal. The proposed system is based on a feed-forward technique to cancel the reflected high-power signal before reaching the vector network analyzer. That allows measuring the effects of the highpower interfering signal into the device's low-power frequency response. This technique does not require either power-calibrated standards or complex calibration techniques. Experiments in several devices are also reported to validate the suitability of this technique.

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“…For now, we assume G I to be constant, this topic is further treated in Section IV. If no LCC is used G I =1, if it is misadjusted or not optimized for broadband operation values of G I < 1 are probable [19].…”

Section: B Reverse Link Limitmentioning

confidence: 99%

Self-interference noise limitations of RFID readers

Lasser

Mecklenbräuker

2015

2015 IEEE International Conference on RFID (RFID)

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In this contribution we compute the read range limits of RFID readers also modelling the often ignored selfinterference and leakage cancellation effects. The forward link limit is defined by the sensitivity of the tag, while the reverse link limit depends on the ability of the reader to decode the tag message. We will express the reverse link limit and the receiver Signal to Noise Ratio (SNR), whose dominating expression is the self-interference noise. Further, we will introduce two Figures Of Merits (FOMs) relevant for the reverse link limit. In a broad range of these FOMs, the receiver SNR is independent of the transmit power and reader noise figure. Further, we calculate the average suppression gain of leakage cancellers which enables us to upper-bound the noise effective cancellation gain which directly relates with the reverse link limit.

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Automatic leaking carrier canceller adjustment techniques

Cited by 9 publications

References 18 publications

A Fully Integrated Passive Self-Jamming Cancellation Architecture with Fast Settling Time for UHF RFID Reader

A Fully Integrated Passive Self-Jamming Cancellation Architecture with Fast Settling Time for UHF RFID Reader

Feed-Forward Technique to Measure the Reflection Coefficient Under CW High-Power Signals

Self-interference noise limitations of RFID readers

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