Terahertz Multi-User Massive MIMO With Intelligent Reflecting Surface: Beam Training and Hybrid Beamforming

Ning, Boyu; Chen, Zhi; Chen, Wenrong; Du, Yiming; Fang, Jun

doi:10.1109/tvt.2021.3052074

Cited by 214 publications

(124 citation statements)

References 44 publications

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“…Compared with existing multi-antenna systems [4]- [9], it has been demonstrated that RISaided systems have the potential to achieve better performance in terms of cost and energy consumption [10]- [16]. Recently, RISs have been considered for integration into various communication scenarios, such as terahertz, sub-terahertz, and millimeter-wave systems [17], [18], simultaneous wireless information and power transfer (SWIPT) [19], unmanned aerial vehicle (UAV) communications [20], cell-free systems [21], physical-layer security [22]- [24], mobile edge computing (MEC) [25]- [27], device-to-device (D2D) communications [28], [29] and so on. Furthermore, the effectiveness of RIS-aided systems in the presence of practical imperfections has been demonstrated in [30]- [34].…”

Section: Introductionmentioning

confidence: 99%

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Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Zhi

Pan

Ren

et al. 2021

IEEE Wireless Commun. Lett.

121

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This paper investigates the performance of reconfigurable intelligent surface (RIS)-aided massive multiple-input multiple-output (mMIMO) systems with direct links, and the phase shifts of the RIS are designed based on the statistical channel state information (CSI). We first derive the closed-form expression of the uplink ergodic data rate. Then, based on the derived expression, we use the genetic algorithm (GA) to solve the sum data rate maximization problem. With low-complexity maximal-ratio combination (MRC) and low-overhead statistical CSI-based scheme, we validate that the RIS can bring significant performance gains to the traditional mMIMO systems.

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Section: Introductionmentioning

confidence: 99%

“…(signal) k (Φ), and denote the noise term of (35) as E q k Recall the expressions in (10) and(17). SinceH 2 ,h k ,d k and N are independent of each other and they all have a zero mean, we can derive the term E q H k q k by selecting the non-zero terms in the expansion as…”

mentioning

confidence: 99%

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Zhi

Pan

Ren

et al. 2021

IEEE Wireless Commun. Lett.

121

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“…The work in [36] combines the IRS and the MIMO technologies, and develops a cooperative beam training scheme to facilitate the channel estimation in a multiuser analogdigital hybrid IRS-assisted THz MIMO system. In particular, two different hierarchical codebooks for the proposed training procedure are designed.…”

Section: Thz Systemsmentioning

confidence: 99%

Intelligent Reflective Surfaces for Wireless Networks: An Overview of Applications, Approached Issues, and Open Problems

et al. 2021

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An intelligent reflective surface (IRS) is a novel and revolutionizing communication technology destined to enable the control of the radio environment. An IRS is a real-time controllable reflectarray with a massive number of low-cost passive elements which introduce a phase shift to the incoming signals from the sources before the propagation towards the destination. This technology introduces the notion of a smart propagation environment with the aim of improving the system performance. In this paper, we provide a comprehensive literature overview on IRS technology, including its basic concepts and reconfiguration, as well as its design aspects and applications for wireless communication systems. We also study the performance metrics and the setups considered in recent publications related to IRS and provide suggestions of future research lines based on still unexplored use cases in the state-of-the-art.

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“…Furthermore, in contrast with microwave and mmWave frequency bands, the formed beam at THz frequency band is much narrower. This is hard for THz communications to realize the beam control and beam tracking [9]. To tackle these challenges, conventional approaches hold that the wireless environment is fixed by nature and we can only optimize the transmitter or receiver design in wireless networks.…”

Section: Introductionmentioning

confidence: 99%

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

et al. 2021

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Terahertz (THz) communications have been widely envisioned as a promising enabler to provide adequate bandwidth and achieve ultra-high data rates for sixth generation (6G) wireless networks. In order to mitigate blockage vulnerability caused by serious propagation attenuation and poor diffraction of THz waves, an intelligent reflecting surface (IRS), which manipulates the propagation of incident electromagnetic waves in a programmable manner by adjusting the phase shifts of passive reflecting elements, is proposed to create smart radio environments, improve spectrum efficiency and enhance coverage capability. Firstly, some prospective application scenarios driven by the IRS empowered THz communications are introduced, including wireless mobile communications, secure communications, unmanned aerial vehicle (UAV) scenario, mobile edge computing (MEC) scenario and THz localization scenario. Then, we discuss the enabling technologies employed by the IRS empowered THz system, involving hardware design, channel estimation, capacity optimization, beam control, resource allocation and robustness design. Moreover, the arising challenges and open problems encountered in the future IRS empowered THz communications are also highlighted. Concretely, these emerging problems possibly originate from channel modeling, new material exploration, experimental IRS testbeds and intensive deployment. Ultimately, the combination of THz communications and IRS is capable of accelerating the

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Terahertz Multi-User Massive MIMO With Intelligent Reflecting Surface: Beam Training and Hybrid Beamforming

Cited by 214 publications

References 44 publications

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Statistical CSI-Based Design for Reconfigurable Intelligent Surface-Aided Massive MIMO Systems With Direct Links

Intelligent Reflective Surfaces for Wireless Networks: An Overview of Applications, Approached Issues, and Open Problems

Towards intelligent reflecting surface empowered 6G terahertz communications: A survey

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