The Rise of Intelligent Reflecting Surfaces in Integrated Sensing and Communications Paradigms

Elbir, Ahmet M.; Mishra, Kumar Vijay; Shankar, M. R. Bhavani; Chatzinotas, Symeon

doi:10.48550/arxiv.2204.07265

Cited by 4 publications

(4 citation statements)

References 12 publications

(83 reference statements)

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“…The IEEE 802.11ad wireless standard for 60GHz has also been explored for JCRS because of its available 2 GHz bandwidth [91,[99][100][101][102]. Some recent wideband JCRS designs employ intelligent reflecting surfaces for non-line-of-sight (NLoS) sensing and communications [103][104][105].…”

Section: E Sar Processing Of Communication Waveformsmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

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Rapid developments in synthetic aperture (SA) systems, which generate a larger aperture with greater angular resolution than is inherently possible from the physical dimensions of a single sensor alone, are leading to novel research avenues in several signal processing applications. The SAs may either use a mechanical positioner to move an antenna through space or deploy a distributed network of sensors. With the advent of new hardware technologies, the SAs tend to be denser nowadays. The recent opening of higher frequency bands has led to wide SA bandwidths. In general, new techniques and setups are required to harness the potential of wide SAs in space and bandwidth. Herein, we provide a brief overview of emerging signal processing trends in such spatially and spectrally wideband SA systems. This guide is intended to aid newcomers in navigating the most critical issues in SA analysis and further supports the development of new theories in the field. In particular, we cover the theoretical framework and practical underpinnings of wideband SA radar, channel sounding, sonar, radiometry, and optical applications. Apart from the classical SA applications, we also discuss the quantum electric-field-sensing probes in SAs that are currently undergoing active research but remain at nascent stages of development.

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Section: E Sar Processing Of Communication Waveformsmentioning

confidence: 99%

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Vouras¹,

Mishra²,

Artusio‐Glimpse³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, the baseband beamformer is F BB = blkdiag{(η − 1), ηI NRF−1 }, which allows the trade-off between the radar and communications tasks. The trade-off between the radar and communications tasks is controlled by choosing η depending on the accuracy/importance of both tasks in the ISAC system [26].…”

Section: The Design Of Communications-only Analog Beamformer F(i)mentioning

confidence: 99%

Millimeter-Wave Radar Beamforming with Spatial Path Index Modulation Communications

Elbir¹,

Mishra²,

Çelik³

2022

Preprint

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To efficiently utilize the wireless spectrum and save hardware costs, the fifth generation and beyond (B5G) wireless networks envisage integrated sensing and communications (ISAC) paradigms to jointly access the spectrum. In B5G systems, the expensive hardware is usually avoided by employing hybrid beamformers that employ fewer radio-frequency chains but at the cost of the multiplexing gain. Recently, it has been proposed to overcome this shortcoming of millimeter wave (mmWave) hybrid beamformers through spatial path index modulation (SPIM), which modulates the spatial paths between the base station and users and improves spectral efficiency. In this paper, we propose an SPIM-ISAC approach for hybrid beamforming to simultaneously generate beams toward both radar targets and communications users. We introduce a low complexity approach for the design of hybrid beamformers, which include radar-only and communications-only beamformers. Numerical experiments demonstrate that our SPIM-ISAC approach exhibits a significant performance improvement over the conventional mmWave-ISAC design in terms of spectral efficiency and the generated beampattern.

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“…Initial research on IRS was limited to wireless communication applications such as range extension to users with obstructed direct links [3], joint wireless information and power transmission [4], physical layer security [5], unmanned air vehicle (UAV) communications [6], and shaping the wireless channel through multi-beam design [7]. Recent works have also introduced IRS to integrated communications and sensing systems [5,[8][9][10]. In this paper, we focus on IRS-aided sensing, following the advances made in [8,11].…”

Section: Introductionmentioning

confidence: 99%

Cramér–Rao Lower Bound Optimization for Hidden Moving Target Sensing via Multi-IRS-Aided Radar

Esmaeilbeig

Mishra

Eamaz

et al. 2022

IEEE Signal Process. Lett.

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Intelligent reflecting surface (IRS) is a rapidly emerging paradigm to enable non-line-of-sight (NLoS) wireless transmission. In this paper, we focus on IRS-aided radar estimation performance of a moving hidden or NLoS target. Unlike prior works that employ a single IRS, we investigate this problem using multiple IRS platforms and assess the estimation performance by deriving the associated Cramér-Rao lower bound (CRLB). We then design Doppler-aware IRS phase shifts by minimizing the scalar A-optimality measure of the joint parameter CRLB matrix. The resulting optimization problem is non-convex, and is thus tackled via an alternating optimization framework. Numerical results demonstrate that the deployment of multiple IRS platforms with our proposed optimized phase shifts leads to a higher estimation accuracy compared to non-IRS and single-IRS alternatives.

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The Rise of Intelligent Reflecting Surfaces in Integrated Sensing and Communications Paradigms

Cited by 4 publications

References 12 publications

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

An Overview of Advances in Signal Processing Techniques for Classical and Quantum Wideband Synthetic Apertures

Millimeter-Wave Radar Beamforming with Spatial Path Index Modulation Communications

Cramér–Rao Lower Bound Optimization for Hidden Moving Target Sensing via Multi-IRS-Aided Radar

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