Dynamic Range Improvement in Bistatic Backscatter Communication Using Distributed MIMO

Kaplan, Ahmet; Vieira, João; Larsson, Erik G.

doi:10.1109/globecom48099.2022.10000927

Cited by 5 publications

(9 citation statements)

References 21 publications

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“…• Using the derived GLRT detector, we analyze the performance of BD symbol detection at the reader in a BiBC setup with multiple antennas. Parts of the results in this paper were presented in [1]. The main difference between this paper and [1] is that herein all channels of a bistatic link are treated as unknown, whereas [1] assumes that the reader has perfect channel state information.…”

Section: Contributions and Organizationmentioning

confidence: 99%

“…Parts of the results in this paper were presented in [1]. The main difference between this paper and [1] is that herein all channels of a bistatic link are treated as unknown, whereas [1] assumes that the reader has perfect channel state information. As a result, novel algorithms for channel estimation are proposed in this paper which are necessary to detect the BD symbol/presence based on the GLRT.…”

Section: Contributions and Organizationmentioning

confidence: 99%

“…In[1], in the numerical results, we used a far-field channel model which was not accurate given the wavelength and the distances in the setup. However, in this journal paper, we have addressed this issue by using the near-field channel model, as shown in Eq (30)…”

mentioning

confidence: 99%

“…. Note that, the far-field channel model and all the numerical results in[1] would remain the same and valid for a different sufficiently small value of λ satisfying the far-field assumption.…”

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confidence: 99%

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Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Kaplan

Vieira

Larsson

2024

IEEE Trans. Wireless Commun.

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Backscatter communication (BC) is a promising technique for future Internet-of-Things (IoT) owing to its low complexity, low cost, and potential for energy-efficient operation in sensor networks. There are several network infrastructure setups that can be used for BC with IoT nodes. One of them is the bistatic setup where typically there is a need for high dynamic range and high-resolution analog-to-digital converters at the reader. In this paper, we investigate a bistatic BC setup with multiple antennas. We propose a novel transmission scheme, which includes a protocol for channel estimation at the carrier emitter (CE) as well as a transmit beamformer construction that suppresses the direct link interference between the two ends of a bistatic link (namely CE and reader), and increases the detection performance of the backscatter device (BD) symbol. Further, we derive a generalized log-likelihood ratio test (GLRT) to detect the symbol/presence of the BD. We also provide an iterative algorithm to estimate the unknown parameters in the GLRT. Finally, simulation results show that the required dynamic range of the system is significantly decreased, and the detection performance of the BD symbol is increased, by the proposed algorithm compared to a system not using beamforming at the CE.

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Section: Contributions and Organizationmentioning

confidence: 99%

Section: Contributions and Organizationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Direct Link Interference Suppression for Bistatic Backscatter Communication in Distributed MIMO

Kaplan

Vieira

Larsson

2024

IEEE Trans. Wireless Commun.

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“…In particular, [16] modifies the tag architecture to adjust the circuit load impedance of the tag to extend the communication range and lower the integrated circuit (IC) power consumption. The works [17], [18] develop interference cancellation schemes to suppress the direct link interference from the RF source, thereby improving the tag's rate. [17] uses beamforming to nullify the direct link interference, while [18] explores the joint design of waveform at the RF source and coding at the tag to mitigate the direct link interference.…”

Section: Previous Contribution On Bibc Systemsmentioning

confidence: 99%

RIS-Empowered Ambient Backscatter Communication Systems

Galappaththige

Rezaei

Tellambura

et al. 2023

IEEE Wireless Commun. Lett.

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This study introduces and investigates the integration of a cell-free architecture with bistatic backscatter communication (BiBC), referred to as cell-free BiBC or distributed access point (AP)-assisted BiBC, which can enable potential applications in future (EH)-based Internet-of-Things (IoT) networks. To that purpose, we first present a pilot-based channel estimation scheme for estimating the direct, cascaded, forward channels of the proposed system setup. We next utilize the channel estimates for designing the optimal beamforming weights at the APs, reflection coefficients at the tags, and reception filters at the reader to maximize the tag sum rate while meeting the tags' minimum energy requirements. Because the proposed maximization problem is non-convex, we propose a solution based on alternative optimization, fractional programming, and Rayleigh quotient techniques. We also quantify the computational complexity of the developed algorithms. Finally, we present extensive numerical results to validate the proposed channel estimation scheme and optimization framework, as well as the performance of the integration of these two technologies. Compared to the random beamforming/combining benchmark, our algorithm yields impressive gains. For example, it achieves ∼ 64.8 % and ∼ 253.5 % gains in harvested power and tag sum rate, respectively, for 10 dBm with 36 APs and 3 tags.

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