A Non-Stationary 3-D Wideband Channel Model for Intelligent Reflecting Surface-Assisted HAP-MIMO Communication Systems

Lian, Zhuxian; Su, Yinjie; Wang, Yajun; Jiang, Lingge

doi:10.1109/tvt.2021.3131765

Cited by 24 publications

(16 citation statements)

References 41 publications

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“…Recently, an increasing amount of research attention has been dedicated to propose an accurate RANTN channel model. For instance, the very recent works [163], [164] adopt the elliptic cylinders to model the propagation environment among the HAP/UAV transmitter, TRIS, and the ground mobile receiver, while the work [165] considers a cluster structure to describe the scattering environment between the UAV transmitter and the TRIS, which indicates that the signals from the UAV will first impinge on the cluster before arriving at the TRIS. Moreover, Xiong et al [166] proposed the TRISassisted A2G mmWave channel model by treating the RIS as a virtual cluster and RIS units as virtual scatterers.…”

Section: A Practical Channel Modelingmentioning

confidence: 99%

Nonterrestrial Communications Assisted by Reconfigurable Intelligent Surfaces

Qiao

Kammoun

et al. 2022

Proc. IEEE

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| Nonterrestrial communications have emerged as a key enabler for seamless connectivity in the upcoming generation networks. This kind of network can support high data rate communications among aerial platforms (i.e., unmanned aerial vehicles (UAVs), high-altitude platforms (HAPs), and satellites) and cellular networks, achieving anywhere and anytime connections. However, there are many practical implementation limitations, especially overload power consumption, high probability of blockage, and dynamic propagation environment. Fortunately, the recent technology reconfigurable intelligent surface (RIS) is expected to be one of the most cost-efficient solutions to address such issues. RIS with low-cost elements can bypass blockages and create multiple line-of-sight (LoS) links and provide controllable communication channels. In this article, we present a comprehensive literature review on the RIS-assisted nonterrestrial networks (RANTNs). First, the framework of the RANTNs is introduced with detailed discussion about distinct properties of RIS in NTNs and the two Manuscript

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Section: A Practical Channel Modelingmentioning

confidence: 99%

Nonterrestrial Communications Assisted by Reconfigurable Intelligent Surfaces

Qiao

Kammoun

et al. 2022

Proc. IEEE

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“…Other channel models have also been proposed for different scenarios based on GBSM approach, e.g., outdoor [122], fixedto-mobile [123], double-RIS [124], high altitude platform [125], UAV [126]- [128], and general MIMO [129] scenarios.…”

Section: Physical Channel Modelmentioning

confidence: 99%

Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling

et al. 2022

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Reconfigurable intelligent surfaces (RISs) are two dimensional (2D) metasurfaces which can intelligently manipulate electromagnetic waves by low-cost near passive reflecting elements. RIS is viewed as a potential key technology for the sixth generation (6G) wireless communication systems mainly due to its advantages in tuning wireless signals, thus smartly controlling propagation environments. In this paper, we aim at addressing channel characterization and modeling issues of RISassisted wireless communication systems. At first, the concept, principle, and potential applications of RIS are given. An overview of RIS based channel measurements and experiments is presented by classifying frequency bands, scenarios, system configurations, RIS constructions, experiment purposes, and channel observations. Then, RIS based channel characteristics are studied, including reflection and transmission, Doppler effect and multipath fading mitigation, channel reciprocity, channel hardening, rank improvement, far field and near field, etc. RIS based channel modeling works are investigated, including largescale path loss models and small-scale multipath fading models. At last, future research directions related to RIS-assisted channels are also discussed.Index Terms-6G wireless communications, reconfigurable intelligent surface (RIS), channel measurements, channel characteristics, channel modeling.

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“…In [21], a 3D non-stationary MIMO channel model was proposed for unmanned aerial vehicle (UAV) communications. Furthermore, based on [21], a high-altitude platform (HAP)-MIMO channel model was proposed in [22]. In [23], a 3D cluster-based model was proposed for UAV-MIMO channels.…”

Section: A Related Workmentioning

confidence: 99%

“…. In this paper, the modified method of equal areas (MMEA)[22] is used to obtain the discrete sets. Based on the numerical root-finding techniques, the discrete expressions of AAoAs α obtained, respectively, as follows:…”

mentioning

confidence: 99%

Modeling and Analysis of MIMO Multipath Channels With Aerial Intelligent Reflecting Surface

et al. 2022

IEEE J. Select. Areas Commun.

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Recently, intelligent reflecting surface (IRS) has become a research focus for its capability of controlling the radio propagation environments. Compared to the conventional terrestrial IRS, aerial IRS (AIRS) exploiting unmanned aerial vehicle (UAV)/high-altitude platform (HAP) can provide better deployment flexibility. To this end, a three-dimensional (3D) onecylinder model is first developed for AIRS-assisted multipleinput multiple-output (MIMO) narrowband channels. In order to change the wireless channel with AIRS and create a favorable propagation environment, we propose a novel method of designing the phase-shifts for the IRS elements. Based on the model, channel impulse response (CIR), space-time correlation function, and channel capacity are derived and thoroughly investigated. A key observation in this paper is that multipath and Doppler effects in radio propagation environments can be effectively mitigated via adjusting the phase-shifts of IRS. More specifically, for the special propagation environments in the absence of any scatterers, it is found that the effects of multipath fading can be completely eliminated by IRSs. While for the general propagation environments with multiple scatterers, a small number of IRS elements can also significantly reduce the Doppler spread and the deep fades in the magnitude of CIR. Based on the numerical investigation of channel correlations, it is shown that channel non-stationarity is not introduced into the time domain when the phase shift of IRS is linear related to the time. Moreover, the channel capacity can also be improved by the proposed methods. Finally, the model with non-ideal IRSs is considered and it is found that using non-ideal IRSs results in poor performances compared with using ideal IRSs. These conclusions will provide

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A Non-Stationary 3-D Wideband Channel Model for Intelligent Reflecting Surface-Assisted HAP-MIMO Communication Systems

Cited by 24 publications

References 41 publications

Nonterrestrial Communications Assisted by Reconfigurable Intelligent Surfaces

Nonterrestrial Communications Assisted by Reconfigurable Intelligent Surfaces

Reconfigurable Intelligent Surfaces: Channel Characterization and Modeling

Modeling and Analysis of MIMO Multipath Channels With Aerial Intelligent Reflecting Surface

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