Investigation of spatial and frequency diversity for long range UHF RFID

Banerjee, Srutarshi; Jesme, R.; Sainati, Robert

doi:10.1109/aps.2008.4619726

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…The FCC has recently opened up for unlicensed access 100-250 MHz of digital whitespaces vacated by television bands as part of the analog-to-digital transition [12]. These whitespaces demonstrate significant frequency diversity [3,39]. Further, they are expected to be used for several static and low mobility scenarios such as fixed wireless broadband access in rural and urban areas, as well as data connectivity inside the home, where FARA could provide significant throughput benefits.…”

Section: Discussionmentioning

confidence: 99%

“…The impact of multipath effects in creating varying signal strength across frequencies is well understood theoretically [47]. Also, multiple measurement studies [36,43,8,29,4] have demonstrated the existence of this frequency diversity in practice, showing that it occurs both at the low end of the RF spectrum, as in white spaces [3,39], as well as the high end of the spectrum, as in 60 GHz technologies [36,43]. Among these, the most relevant to our work are measurement studies in the 2.4 and 5.2 GHz spectrum [8,29,4] (corresponding to 802.11b/g and 802.11a, respectively), which report a difference in signal strength of as much as 20 dB between frequency bands both in line-of-sight (LOS) and non line-of-sight (NLOS) scenarios.…”

Section: Related Workmentioning

confidence: 99%

“…3 This is because noise comes from thermal noise in the receiver hardware, quantization, and digital computation errors, which are all independent of frequency. Thus, we can rewrite Eq.…”

Section: Per-subband Snr Estimationmentioning

confidence: 99%

See 2 more Smart Citations

Frequency-aware rate adaptation and MAC protocols

Rahul

Edalat²,

Katabi

et al. 2009

Proceedings of the 15th Annual International Conference on Mobile Computing and Networking

150

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There has been burgeoning interest in wireless technologies that can use wider frequency spectrum. Technology advances, such as 802.11n and ultra-wideband (UWB), are pushing toward wider frequency bands. The analog-to-digital TV transition has made 100-250 MHz of digital whitespace bandwidth available for unlicensed access. Also, recent work on WiFi networks has advocated discarding the notion of channelization and allowing all nodes to access the wide 802.11 spectrum in order to improve load balancing. This shift towards wider bands presents an opportunity to exploit frequency diversity. Specifically, frequencies that are far from each other in the spectrum have significantly different SNRs, and good frequencies differ across sender-receiver pairs.This paper presents FARA, a combined frequency-aware rate adaptation and MAC protocol. FARA makes three departures from conventional wireless network design: First, it presents a scheme to robustly compute per-frequency SNRs using normal data transmissions. Second, instead of using one bit rate per link, it enables a sender to adapt the bitrate independently across frequencies based on these per-frequency SNRs. Third, in contrast to traditional frequency-oblivious MAC protocols, it introduces a MAC protocol that allocates to a sender-receiver pair the frequencies that work best for that pair. We have implemented FARA in FPGA on a wideband 802.11-compatible radio platform. Our experiments reveal that FARA provides a 3.1× throughput improvement in comparison to frequency-oblivious systems that occupy the same spectrum.

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Section: Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Frequency-aware rate adaptation and MAC protocols

Rahul

Edalat²,

Katabi

et al. 2009

Proceedings of the 15th Annual International Conference on Mobile Computing and Networking

150

View full text Add to dashboard Cite

show abstract

“…Fading on the signal received by the RF tag was the focus of Mitsugi and Shibao [7,8] and Polivka et al [9] studies. Others have studied fading on the signal received by the reader: Kim et al [10] have presented small-scale fading statistics (the cumulative distribution functions) for short ranges in an indoor environment at 2.4 GHz, while Banerjee et al [11,12] have presented fading measurements at 915 MHz and demonstrated the importance of spatial and frequency diversity to effectively mitigate multipath fading effects.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of orthogonal space‐time block codes over Nakagami‐qMIMO RFID backscattering channels

Jamoos

Qabbani

2018

IET Communications

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“…To understand and combat multipath in backscatter radio systems, several researchers have reported measurements of both fading on the signal received by the RF tag and tag readability measurements [1]- [7]. Banerjee et al [8] have presented spatial and frequency diversity measurements for the signal received by the RF tag at 915 MHz. In contrast, Kim et al [9] have reported measured envelope cumulative distribution functions (CDFs) for the backscattered signal received from the RF tag at 2.4 GHz.…”

Section: Introductionmentioning

confidence: 99%

Multipath Fading Measurements at 5.8 GHz for Backscatter Tags With Multiple Antennas

Griffin

Durgin

2010

IEEE Trans. Antennas Propagat.

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Multipath fading can be heavy for ultra-high frequency (UHF) and microwave backscatter radio systems used in applications such as radio frequency identification (RFID). This paper presents measurements of fading on the modulated signal backscattered from a transponder for backscatter radio systems that use multiple antennas at the interrogator and transponder. Measurements were performed at 5.8 GHz and estimates of the backscatter channel envelope distributions and fade margins were calculated. Results show that multipath fading can be reduced using multiple transponder antennas, bistatic interrogators with widely separated transmitter and receiver antennas, and conventional diversity combining at the interrogator receiver. The measured envelope distribution estimates are compared to previously derived distributions and show good agreement.

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Investigation of spatial and frequency diversity for long range UHF RFID

Cited by 12 publications

References 3 publications

Frequency-aware rate adaptation and MAC protocols

Frequency-aware rate adaptation and MAC protocols

Performance analysis of orthogonal space‐time block codes over Nakagami‐qMIMO RFID backscattering channels

Multipath Fading Measurements at 5.8 GHz for Backscatter Tags With Multiple Antennas

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