Design of Channel Estimation for Hybrid Beamforming Millimeter-Wave Systems in the Presence of Beam Squint

Noh, Song; Lee, Jaekoo; Yu, Heejung; Song, Jiho

doi:10.1109/jsyst.2021.3079924

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…Pilot sequences and training patterns are necessary for channel estimation algorithms, such as least squares, minimum mean squared errors, and compressed sensing. The spatially sparse nature of mmWave and sub-THz channels can reduce training burden and performance error [47]. Nevertheless, accurate channel models and hardware designs are needed.…”

Section: B Channel Modeling 1) Research Issuesmentioning

confidence: 99%

Simultaneous Transmitting and Reflecting-Reconfigurable Intelligent Surface in 6G: Design Guidelines and Future Perspectives

Khalid¹,

Kaleem²,

Ullah³

et al. 2023

IEEE Network

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Sixth-generation (6G) networks pose substantial security risks because confidential information is transmitted over wireless channels with a broadcast nature, and various attack vectors emerge. Physical layer security (PLS) exploits the dynamic characteristics of wireless environments to provide secure communications, while reconfigurable intelligent surfaces (RISs) can facilitate PLS by controlling wireless transmissions. With RIS-aided PLS, a lightweight security solution can be designed for low-end Internet of Things (IoT) devices, depending on the design scenario and communication objective. This article discusses RIS-aided PLS designs for 6G-IoT networks against eavesdropping and jamming attacks. The theoretical background and literature review of RIS-aided PLS are discussed, and design solutions related to resource allocation, beamforming, artificial noise, and cooperative communication are presented. We provide simulation results to show the effectiveness of RIS in terms of PLS. In addition, we examine the research issues and possible solutions for RIS modeling, channel modeling and estimation, optimization, and machine learning. Finally, we discuss recent advances, including STAR-RIS and malicious RIS.

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Section: B Channel Modeling 1) Research Issuesmentioning

confidence: 99%

Simultaneous Transmitting and Reflecting-Reconfigurable Intelligent Surface in 6G: Design Guidelines and Future Perspectives

Khalid¹,

Kaleem²,

Ullah³

et al. 2023

IEEE Network

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“…The wideband mmwave communication supported by a reconfigurable intelligent surface (RIS) suffering from the beam-squinting effect was first studied by [57]. Each component of the RIS is a nearly passive device, similar to the phase shifter [58], and it is a novel sort of "array" that has garnered considerable interest from both academics and the industry.…”

Section: Studies Related To the Beam Squint Effectsmentioning

confidence: 99%

A Critical Examination of the Beam-Squinting Effect in Broadband Mobile Communication: Review Paper

2023

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Due to the fact that the quality of the received signal is adversely affected by the beam squint phenomenon, which is especially pertinent to the millimeter wave (mmwave) bands, many studies have been utilised by other researchers to provide light on some of the challenges that come with analysing this type of occurrence. Squint causes several issues, the most important of which are its detrimental effects on gain, line of sight, angle of arrival, progressive phase, usable bandwidth, and fading effect. As a result of these obstacles, the advantages of adopting a high-frequency band such as mmwave in modern wireless communication systems are severely limited. Squint-phenomena-related difficulties, such as decreased channel capacity, increased bit error rate (BER), and lowered quality of services, may have a substantial detrimental impact on channel performance. The squint phenomenon and associated issues become more pressing with the expansion of the frequency spectrum and the deviation of the arrival angle from boresight. The purpose of this article is to provide a comprehensive overview of the relevant literature and to compare and contrast various methods in order to identify the most fruitful lines of inquiry for future research.

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“…To this end, the potential key enabling technologies and solutions of future 6G networks include massive MIMO [10], dynamic spectrum sharing with full-duplex (FD)/device-todevice (D2D) communications [11], artificial intelligence (AI) [12], terahertz (THz) bands [13], non-terrestrial communications [14], reconfigurable intelligent surface (RIS) [15], and simultaneous wireless information and power transfer (SWIPT) [16]. In particular, RIS and SWIPT are the novel technologies to enable the energy efficiency and spectrum efficiency and provide the innovative solutions to the inherent challenges in the developments of the 6G systems.…”

Section: Introductionmentioning

confidence: 99%

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

Khalid

Cho

et al. 2022

IEEE Access

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This paper investigates the reconfigurable intelligent surface (RIS)-empowered dynamic power splitting designs for simultaneous wireless information and power transfer (SWIPT) systems while adopting various practical hardware issues. Specifically, we adopt the physical size of the RIS and the placement of the RIS plane to phase-align the reflected signals towards the desired direction. The analytical phase shift model for the reflecting elements is presented to characterize an intertwined relationship between amplitude and phase responses, which captures the amplitude variations depending on phase in RIS elements. Furthermore, an additive distortion noise incorporates the residual transceiver hardware impairments (RTHIs). The stringent signal-to-interference-plus-noise ratio requirement is facilitated using both the direct and indirect, i.e., RIS cascaded, links. To made complicated analysis become tractable, we exploit the statistical properties of the effective channel power which follows a Gamma distribution. The tight bounds for the achievable rates and residual energy are derived and the tradeoffs between the achievable rate and residual energy for the time switching and static power splitting designs are characterized. Finally, the numerical results confirm the accuracy of the developed framework and demonstrate the selection of the system parameters.INDEX TERMS RIS, SWIPT, RTHIs, phase-dependent amplitude response, rate-residual energy tradeoffs.

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Design of Channel Estimation for Hybrid Beamforming Millimeter-Wave Systems in the Presence of Beam Squint

Cited by 12 publications

References 27 publications

Simultaneous Transmitting and Reflecting-Reconfigurable Intelligent Surface in 6G: Design Guidelines and Future Perspectives

Simultaneous Transmitting and Reflecting-Reconfigurable Intelligent Surface in 6G: Design Guidelines and Future Perspectives

A Critical Examination of the Beam-Squinting Effect in Broadband Mobile Communication: Review Paper

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

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