Multi-RIS-Aided Wireless Systems: Statistical Characterization and Performance Analysis

Nhu, Tri; Kaddoum, Georges; Nguyen, Thanh-Luan; Costa, Daniel Benevides da; Haas, Zygmunt J.

doi:10.1109/tcomm.2021.3117599

Cited by 131 publications

(76 citation statements)

References 34 publications

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“…In this section, we study the outage performance of the proposed transmission schemes, which is a key performance metric for delay-limited mMTC networks. An outage event occurs whenever the instantaneous achievable rate drops below a pre-defined transmission rate threshold [32]. As a result, the OP at D [I] or D [II] is defined as the probability that the outage event occurs at that device.…”

Section: Performance Analysismentioning

confidence: 99%

Performance Analysis of Multi-user NOMA Wireless-Powered mMTC Networks: A Stochastic Geometry Approach

Nguyen¹,

Do²,

Kaddoum³

2022

Preprint

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In this paper, we aim to improve the connectivity, scalability, and energy efficiency of machine-type communication (MTC) networks with different types of MTC devices (MTCDs), namely Type-I and Type-II MTCDs, which have different communication purposes. To this end, we propose two transmission schemes called connectivityoriented machine-type communication (CoM) and quality-oriented machine-type communication (QoM), which take into account the stochastic geometry-based deployment and the random active/inactive status of MTCDs. Specifically, in the proposed schemes, the active Type-I MTCDs operate using a novel Bernoulli random process-based simultaneous wireless information and power transfer (SWIPT) architecture. Next, utilizing multi-user power-domain non-orthogonal multiple access (PD-NOMA), each active Type-I MTCD can simultaneously communicate with another Type-I MTCD and a scalable number of Type-II MTCDs. In the performance analysis of the proposed schemes, we prove that the true distribution of the received power at a Type-II MTCD in the QoM scheme can be approximated by the Singh-Maddala distribution. Exploiting this unique statistical finding, we derive approximate closed-form expressions for the outage probability (OP) and sum-throughput of massive MTC (mMTC) networks.Through numerical results, we show that the proposed schemes provide a considerable sum-throughput gain over conventional mMTC networks.

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Section: Performance Analysismentioning

confidence: 99%

Performance Analysis of Multi-user NOMA Wireless-Powered mMTC Networks: A Stochastic Geometry Approach

Nguyen¹,

Do²,

Kaddoum³

2022

Preprint

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“…The polar representation of the complex channel coefficient hc can be expressed as hc = h c e jθc , for c ∈ {Sr, rD}, where h c is the magnitude, i.e., h c = | hc |, and θ c ∈ [0, 2π) is the phase of hc . Considering a practical composite fading channel, in which the small-scale fading, G c , is modeled as a Nakagami-m RV and the largescale shadowing, L c , is modeled as an IG RV, we have that 2 The source code is published at https://github.com/trinhudo/Aerial-RIS…”

Section: System and Chanel Modelsmentioning

confidence: 99%

“…Reconfigurable intelligent surfaces (RISs) have arisen as a promising solution for future sixth generation (6G) wireless communication systems [1], [2]. An RIS is an array consisting of a large number of passive reflecting elements, in which each element can be programmed and electronically controlled to configure its phase-shift independently so that impinging waves can be reflected and steered toward an intentional direction.…”

Section: Introductionmentioning

confidence: 99%

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Aerial Reconfigurable Intelligent Surface-Aided Wireless Communication Systems

Nhu¹,

Kaddoum²,

Nguyen

et al. 2021

2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

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In this paper 1 , we propose and investigate an aerial reconfigurable intelligent surface (aerial-RIS)-aided wireless communication system. Specifically, considering practical composite fading channels, we characterize the air-to-ground (A2G) links by Namkagami-m small-scale fading and inverse-Gamma largescale shadowing. To investigate the delay-limited performance of the proposed system, we derive a tight approximate closedform expression for the end-to-end outage probability (OP). Next, considering a mobile environment, where performance analysis is intractable, we rely on machine learning-based performance prediction to evaluate the performance of the mobile aerial-RIS-aided system. Specifically, taking into account the threedimensional (3D) spatial movement of the aerial-RIS, we build a deep neural network (DNN) to accurately predict the OP. We show that: (i) fading and shadowing conditions have strong impact on the OP, (ii) as the number of reflecting elements increases, aerial-RIS achieves higher energy efficiency (EE), and (iii) the aerial-RIS-aided system outperforms conventional relaying systems.

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“…Due to the rapid development of metamaterials, reconfigurable intelligent surface (RIS), which is composed of multiple reflecting units, has recently emerged as a promising technique to improve the quality of the future wireless communications [1]- [4]. Specifically, by controlling the reflecting elements at the RIS, the reflection direction of the electromagnetic wave can be controlled accurately.…”

Section: Introductionmentioning

confidence: 99%

Robust Transmission Design for RIS-Aided Communications with Both Transceiver Hardware Impairments and Imperfect CSI

Peng¹,

Chen²,

Pan³

et al. 2021

Preprint

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Reconfigurable intelligent surface (RIS) or intelligent reflecting surface (IRS) has recently been envisioned as one of the most promising technologies in the future sixthgeneration (6G) communications. In this paper, we consider the joint optimization of the transmit beamforming at the base station (BS) and the phase shifts at the RIS for an RIS-aided wireless communication system with both hardware impairments and imperfect channel state information (CSI). Specifically, we assume both the BS-user channel and the BS-RIS-user channel are imperfect due to the channel estimation error, and we consider the channel estimation error under the statistical CSI error model. Then, the transmit power of the BS is minimized, subject to the outage probability constraint and the unit-modulus constraints on the reflecting elements. By using Bernstein-type inequality and semidefinite relaxation (SDR) to reformulate the constraints, we transform the optimization problem into a semidefinite programming (SDP) problem. Numerical results show that the proposed robust design algorithm can ensure communication quality of the user in the presence of both hardware impairments and imperfect CSI.Index Terms-Reconfigurable intelligent surface (RIS), intelligent reflecting surface (IRS), hardware impairments, imperfect channel state information (CSI).

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Multi-RIS-Aided Wireless Systems: Statistical Characterization and Performance Analysis

Cited by 131 publications

References 34 publications

Performance Analysis of Multi-user NOMA Wireless-Powered mMTC Networks: A Stochastic Geometry Approach

Performance Analysis of Multi-user NOMA Wireless-Powered mMTC Networks: A Stochastic Geometry Approach

Aerial Reconfigurable Intelligent Surface-Aided Wireless Communication Systems

Robust Transmission Design for RIS-Aided Communications with Both Transceiver Hardware Impairments and Imperfect CSI

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