RIS-Empowered Ambient Backscatter Communication Systems

Galappaththige, Diluka Loku; Rezaei, Fatemeh; Tellambura, Chintha; Herath, Sanjeewa P.

doi:10.1109/lwc.2022.3220158

Cited by 24 publications

(6 citation statements)

References 87 publications

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“…The authors of [16] combine the advantages of RIS and AmBC transmission, where the D2D terminals are able to flexibly select the operating mode to construct better channel conditions. The authors of [17] demonstrated that deploying RISs between the tag and the reader provides significant performance gains in a RIS-empowered AmBC system.…”

Section: A Prior Work 1) Studies On Backcom Systemsmentioning

confidence: 99%

Coexisting Passive RIS and Active Relay-Assisted NOMA Systems

Huang

Guo

et al. 2023

IEEE Trans. Wireless Commun.

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A simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted downlink (DL) active and uplink (UL) backscatter communication (BackCom) framework is proposed. More particularly, a full-duplex (FD) base station (BS) communicates with the DL users via the STAR-RIS's transmission link, while exciting and receiving the information from the UL BackCom devices with the aid of the STAR-RIS's reflection link. Non-orthogonal multiple access (NOMA) is exploited in both DL and UL communications for improving the spectrum efficiency. The system weighted sum rate maximization problem is formulated for jointly optimizing the FD BS active receive and transmit beamforming, the STAR-RIS passive beamforming, and the DL NOMA decoding orders, subject to the DL user's individual rate constraint. To tackle this challenging non-convex problem, we propose an alternating optimization (AO) based algorithm for the joint active and passive beamforming design with a given DL NOMA decoding order. To address the potential high computational complexity required for exhaustive searching all the NOMA decoding orders, an efficient NOMA user ordering scheme is further developed. Finally, numerical results demonstrate that: i) compared with the baseline schemes employing conventional RISs or space division multiple access, the proposed scheme achieves higher performance gains; and ii) higher UL rate gain is obtained at a cost of DL performance degradation, as a remedy, a more flexible performance tradeoff can be achieved by introducing the STAR-RIS.

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Section: A Prior Work 1) Studies On Backcom Systemsmentioning

confidence: 99%

Coexisting Passive RIS and Active Relay-Assisted NOMA Systems

Huang

Guo

et al. 2023

IEEE Trans. Wireless Commun.

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“…The collaborative design of RIS phase shifts enables constructive or destructive reception of reflected signals, which improves the received signal energy and SNR. Consequently, RISs will extend the tag communication range [128]- [133]. Fig.…”

Section: ) Ris-assisted Communicationmentioning

confidence: 99%

“…They can also reduce the backscatter data collection overhead [275], [276]. The adaptation of RIS in the forward link can amplify the emitter signal that reaches the tag and increases the communication range [133], [277], [278]. Therefore, we…”

Section: ) Uav/ris/relay-assisted Backcommentioning

confidence: 99%

Link Budget Analysis for Backscatter-Based Passive IoT

et al. 2022

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Massive connectivity of billions of communicating devices for fifth-generation (5G) and beyond networks requires the deployment of self-sustaining, maintenance-free, and low-cost communication paradigms. Could passive Internet of Things (IoT) solve these challenges? Passive IoT can be realized with the backscatter communication (BackCom) paradigm, which uses ultra-low power, inexpensive passive tags to support massive connectivity. However, a comprehensive link budget analysis for BackCom networks has not yet been available. It is something that is necessary for practitioners and researchers to evaluate the potential of BackCom. This survey is organized as follows. First, we describe the BackCom configurations, passive IoT design targets, backscatter channel statistics, and the different components and operations of the backscatter tag. Second, we develop the forward link budget and the overall link budget. All the relevant parameters are described in detail. Third, we give numerical and simulation results to get insights on the achievable performance of BackCom networks. Since additive path losses and excess fading can limit the performance of BackCom networks, we examine potential solutions to overcome the resulting limitations, enabling massive IoT networks. We also discuss integrating BackCom with existing wireless technologies. We further highlight some applications and address open issues, challenges, and future research directions.

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“…Passive IoT refers to a new paradigm that focuses on IoT deployments with battery-free devices, and the race toward the definition and standardization of passive IoT has already been initiated; for instance, the third-generation partnership project (3GPP) has run initial studies of use cases and requirements in Release 18 [2,3]. For their operation, passive IoT should rely on the evolution of critical technologies, namely environment energy harvesting, low-power computing and backscatter communication (BC).…”

Section: Introductionmentioning

confidence: 99%

Signal Processing Aspects of Bistatic Backscatter Communication

Kaplan

2024

Linköping Studies in Science and Technology. Licentiate Thesis

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Passive Internet-of-Things (IoT), a new paradigm based on battery-free devices, is a promising technology to enable several use cases that require connectivity with stringent requirements in terms of cost, complexity, and energy efficiency. These use cases span critical sectors, such as healthcare, transportation, and agriculture. Passive IoT relies on the development of technologies such as radio frequency (RF) energy harvesting, low-power computing, and backscatter communication. Particularly, backscatter communication allows devices to modulate its information on external RF signals that are backscattered to the receiver or reader.BC considers the following elements: a carrier emitter (CE), a reader, and a backscatter device (BD). The main BC configurations are monostatic BC (MoBC), ambient BC (AmBC) and bistatic BC (BiBC). In a MoBC setup, the CE and reader are co-located and share parts of the same infrastructure. A monostatic system suffers from round-trip path loss, and requires full-duplex technology if the same antennas are simultaneously used for transmission and reception. In an AmBC setup, CE and reader are in different locations, while the CE is not considered dedicated. AmBC uses ambient sources to transmit information, such as Wi-Fi, Bluetooth, and TV signals. In BiBC, the CE and reader are also spatially separated from each other, but there is a dedicated CE. In addition, BiBC can operate in half duplex mode, thus avoiding the complexity associated to the full-duplex operation.Due to the double path-loss effect on the two-way backscatter link, the received backscattered signal is typically weak compared to the direct link interference (DLI) from a CE. This requires a high dynamic range of the circuitry in the reader. As a result, a high-resolution analog-to-digital converter (ADC) is required to detect the weak backscattered signal under heavy DLI; this represents a great limitation because ADCs are major power consumers. Nonetheless, the benefits provided by multiple-antenna and distributed multiple-input multiple-output (MIMO) technologies can be explored to circumvent the limitations of BiBC, which is the main focus of this thesis.

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RIS-Empowered Ambient Backscatter Communication Systems

Cited by 24 publications

References 87 publications

Coexisting Passive RIS and Active Relay-Assisted NOMA Systems

Coexisting Passive RIS and Active Relay-Assisted NOMA Systems

Link Budget Analysis for Backscatter-Based Passive IoT

Signal Processing Aspects of Bistatic Backscatter Communication

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