BackFi

Bharadia, Dinesh; Joshi, Kiran; Kotaru, Manikanta; Katti, Sachin

doi:10.1145/2785956.2787490

Cited by 248 publications

(14 citation statements)

References 35 publications

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“…Furthermore, it requires a large antenna which limits practical deployment for many applications. Other systems such as WiFi backscatter [29], FreeRider [77], HitchHike [75], BackFi [13], and PLoRa [49] can achieve sufficient range only in proximity to the ambient signal source (WiFi router or LoRa node). We overcome these limitations; TunnelScatter introduces a new modality that enables wireless transmissions for sensor tags without requiring any ambient signal.…”

Section: Related Workmentioning

confidence: 99%

TunnelScatter

Varshney

Soleiman

Voigt

2019

The 25th Annual International Conference on Mobile Computing and Networking

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Due to extremely low power consumption, backscatter has become the transmission mechanism of choice for batteryfree devices that operate on harvested energy. However, a limitation of recent backscatter systems is that the communication range scales with the strength of the ambient carrier signal (ACS). This means that to achieve a long range, a backscatter tag needs to reflect a strong ACS, which in practice means that it needs to be close to an ACS emitter. We present TunnelScatter, a mechanism that overcomes this limitation. TunnelScatter uses a tunnel diode-based radio frequency oscillator to enable transmissions when there is no ACS, and the same oscillator as a reflection amplifier to support backscatter transmissions when the ACS is weak. Our results show that even without an ACS, TunnelScatter is able to transmit through several walls covering a distance of 18 m while consuming a peak biasing power of 57 µW. Based on TunnelScatter, we design battery-free sensor tags, called TunnelTags, that can sense physical phenomena and transmit them using the TunnelScatter mechanism. CCS CONCEPTS • Hardware → Networking hardware; Sensor devices and platforms; Wireless devices; • Computer systems organization → Sensor networks.

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Section: Related Workmentioning

confidence: 99%

TunnelScatter

Varshney

Soleiman

Voigt

2019

The 25th Annual International Conference on Mobile Computing and Networking

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“…To decode the information from the received backscattered signals, the envelope detection and averaging techniques are employed at the AB receiver (AB-Rx) [2]. The AB can be easily im-plemented together with any wireless communication node since AB can be deployed without complex circuitry and encoding/decoding schemes [3,6]. As main characteristic, the operation of BC depends on the existence of RF signals and the active components.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the BC is normarlly co-deployed with existing communication systems. The authors in [3] Regarding power consumption, a BD can Operate at low power as several µW [8]. The authors in [9] introduced where the secondary receiver is co-located with the primary receiver to form BC-aided cognitive radio.…”

Section: Introductionmentioning

confidence: 99%

Exploiting impact of imperfect CSI on Performance of Backscatter-Aided NOMA System

Nguyen

2022

ECTI-CIT Transactions

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In this paper, we consider the impact of imperfect channel state information (CSI) on outage probability of users in an ambient backscatter (AB) enabled nonorthogonal multiple access (NOMA) network. In our proposed scheme, a source node communicates with two destinations via a radio frequency-powered device. Such device is assume with ability of backscattering the signals from the base station. We derive expressions to show the outage probability of main nodes in such system. The analytical expressions for the outage probability are checked with Monte-Carlo simulations. It has been shown that the analytical results match the simulation results. In particular, the user with higher allocated power exhibits its performance better than another 10%-15% when signal to noise ratio (SNR) at the source node is 30 dB.

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“…Instead of generating their own radio frequency (RF) signals to transmit information, the nodes in the backscattering communication reflect the ambient (e.g., TV signal [1], Wi-Fi signal [2]) or dedicated signal [3] in the air 1 and modulate the signal to embed their own information bits. RF identification (RFID) is a widely used system based on backscattering, where a RFID reader generates continuous wave and the tag can reflect the signal for data transmission.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to RFID system, a specialized hardware is required in dedicated backscatter systems to generate excitation signal and decode the reflected signal, which brings additional cost and is not convenient to deploy anywhere. Recent work on backscatter the existing Wi-Fi and Bluetooth radios from commodity devices, such as Wi-Fi backscatter [4], BackFi [2], FreeRider [5], HitchHike [6] and implicit Wi-Fi backscatter [7], has reduced the requirement for specialized hardware. The passive tag in BackFi system is able to communicate with Wi-Fi access points (AP) using standard Wi-Fi packets as excitation signals.…”

Section: Introductionmentioning

confidence: 99%

On Measurement of the Spatio-Frequency Property of OFDM Backscattering

Zhang

et al. 2018

2018 4th International Conference on Big Data Computing and Communications (BIGCOM)

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Orthogonal frequency-division multiplexing (OFDM) backscatter system, such as Wi-Fi backscatter, has recently been recognized as a promising technique for the IoT connectivity, due to its ubiquitous and low-cost property. This paper investigates the spatial-frequency property of the OFDM backscatter which takes the distance and the angle into account in different frequency bands. We deploy three typical scenarios for performing measurements to evaluate the received signal strength from the backscatter link. The impact of the distances among the transmitter, the tag and the receiver, as well as the angle between the transmitter and the tag is observed through the obtained measurement data. From the evaluation results, it is found that the best location of tag is either close to the receiver or the transmitter which depends on the frequency band, and the best angle is 90 degrees between the transmitter and the receiver. This work opens the shed light on the spatial deployment of the backscatter tag in different frequency band with the aim of improving the performance and reducing the interference.

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BackFi

Cited by 248 publications

References 35 publications

TunnelScatter

TunnelScatter

Exploiting impact of imperfect CSI on Performance of Backscatter-Aided NOMA System

On Measurement of the Spatio-Frequency Property of OFDM Backscattering

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