A WiFi and Bluetooth Backscattering Combo Chip Featuring Beam Steering via a Fully-Reflective Phased-Controlled Multi-Antenna Termination Technique Enabling Operation Over 56 Meters

Kuo, Shih-Kai; Dunna, Manideep; Bharadia, Dinesh; Mercier, Patrick P.

doi:10.1109/isscc42614.2022.9731744

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…The IF data are designed such that the only one side band spectrum is used. The latest design by the same group replaced the delay lines by lumped elements [46] in which a steerable beam can be generated.…”

Section: B Delay Linesmentioning

confidence: 99%

Spectrally Efficient Backscatter Systems: A Hardware-Oriented Survey

Alhassoun

2023

IEEE Access

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The growing interest in backscatter communications as a low-powered solution in various fields necessitates pushing the envelope of current backscatter systems in multiple frontiers, among which is spectral efficiency. The increase in spectral efficiency can drive real-time applications such as augmented reality. In most of backscatter-system applications such as radio-frequency identification, backscatter modulation is implemented using binary schemes realized with square pulses, which are not spectral efficient. To address the spectral efficiency concern, this article reviews-with a scope limited to prototyped systems-some of the existing works in the literature that pertain to increasing the spectral efficiency of backscatter systems. The prototyped systems can be grouped-based on the implementation technique used-into three groups: High-order modulation, single-sideband modulation, and pulse shaping. Based on the current trends and studied literature, the article concludes with discussions on some future directions and open-ended research problems such as optimal pulse shaping, the use of artificial intelligence, multi-carrier modulation, and agile modulation; which are all aim for overcoming the spectral-efficiency limit of contemporary backscatter systems.

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Section: B Delay Linesmentioning

confidence: 99%

Spectrally Efficient Backscatter Systems: A Hardware-Oriented Survey

Alhassoun

2023

IEEE Access

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“…Previous implementations [53][54][55] demonstrate the backscatter capabilities for IoT applications based on custom ICs. Their small form factor and ultra-low power consumption, often orders of magnitude lower than systems built with lumped components, are attractive features.…”

Section: Hardware Implementation and Power Reviewmentioning

confidence: 99%

Positioning Energy-Neutral Devices: Technological Status and Hybrid RF-Acoustic Experiments

et al. 2022

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The digital transformation is exciting the uptake of Internet-of-Things technologies, and raises the questions surrounding our knowledge of the positions of many of these things. A review of indoor localization technologies summarized in this paper shows that with conventional RF-based techniques, a significant challenge exists in terms of achieving good accuracy with a low power consumption at the device side. We present hybrid RF-acoustic approaches as an interesting alternative: the slow propagation speed of sound allows for accurate distance measurements, while RF can easily provide synchronization, data, and power to the devices. We explain how the combination of adequate signaling realizing a late wake-up of the devices with backscattering could position energy-neutral devices. Experiments in a real-life testbed confirmed the potential 10 cm-accuracy based on RF-harvested energy. Nonetheless, these also expose open challenges to be resolved in order to achieve accurate 3D positioning.

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“…However, these approaches require additional tone generators that are not readily available in commodity hardware, thereby increasing the total cost of system deployment. Alternatively, recent research has introduced ambient backscatter, which capitalizes on existing WiFi/BLE signals [4]- [8]. By modulating the phase of the incident transmitted signal, such approaches eliminate the need for dedicated tone generators and optimizes the utilization of existing infrastructure.…”

Section: Introductionmentioning

confidence: 99%

“…The initial presentation of this combo-chip solution was given in [13], whereas this article provides a more comprehensive analysis, system design considerations, and implementation details. Section II introduces the fullyreflective transmission-line-less backscatter and the beamsteering technique.…”

Section: Introductionmentioning

confidence: 99%

A WiFi and Bluetooth Low-Energy Backscatter Combo Chip With Beam Steering Capabilities

Kuo,

Dunna,

Bharadia

et al. 2023

IEEE Open J. Solid-State Circuits Soc.

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This article introduces a dual-mode backscatter integrated circuit that supports both WiFi and Bluetooth Low Energy (BLE) transmissions. It enables a multi-antenna WiFi mode with reconfigurable beam steering of single-sideband (SSB) quadrature phase shift-keying (QPSK) signals, while also facilitating omnidirectional SSB BLE-to-BLE backscatter communication. To achieve beam steering, two techniques are proposed: 1) a transmission-line-less fully-reflective SP4T backscatter switch is employed to minimize power loss and maximize the communication range; and 2) a multi-antenna array is constructed using the aforementioned SP4T switches together with a baseband phase-shifting technique to re-radiate the incident WiFi signal with a controllable angle of direction. The chip implementation is based on a 65-nm CMOS process and operates at a power consumption of 5.5µW in standby mode. In backscattering mode, it consumes 39µW for the single-antenna approach and 88µW for the multi-antenna approach. The proposed design achieves a worst-case access point (AP)-to-AP range of 35m and 56m for the single-antenna and multi-antenna approaches, respectively.INDEX TERMS Wi-Fi, Bluetooth Low Energy (BLE), backscatter communication, Internet-of-Things (IoT), low-power wireless system, range improvement, wake-up radios.

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A WiFi and Bluetooth Backscattering Combo Chip Featuring Beam Steering via a Fully-Reflective Phased-Controlled Multi-Antenna Termination Technique Enabling Operation Over 56 Meters

Cited by 15 publications

References 3 publications

Spectrally Efficient Backscatter Systems: A Hardware-Oriented Survey

Spectrally Efficient Backscatter Systems: A Hardware-Oriented Survey

Positioning Energy-Neutral Devices: Technological Status and Hybrid RF-Acoustic Experiments

A WiFi and Bluetooth Low-Energy Backscatter Combo Chip With Beam Steering Capabilities

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