MIMO Assisted Networks Relying on Intelligent Reflective Surfaces: A Stochastic Geometry Based Analysis

Hou, Tianwei; Liu, Yuanwei; Song, Zhengyu; Sun, Xiaoying; Chen, Yue; Hanzo, Lajos

doi:10.1109/tvt.2021.3129308

Cited by 48 publications

(35 citation statements)

References 52 publications

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“…Under the same rationale of (4) and its asymptotic expansion in (14) while applying the arithmetic-quadratic inequality, i.e.…”

Section: B Diversity Analysismentioning

confidence: 99%

“…On the other hand, there is a lack of literature on the impact of the locations of multiple RISs. In [14], the authors investigate a single-cell multiuser system aided by multiple co-located intelligent surfaces (equivalent to a single large RIS). However, the different works in [2]- [14] consider either a single RIS or multiple RISs at given locations, and have not addressed the multi-RISs deployment issue, which is practically important for RIS-assisted wireless systems.…”

Section: Introductionmentioning

confidence: 99%

“…In [14], the authors investigate a single-cell multiuser system aided by multiple co-located intelligent surfaces (equivalent to a single large RIS). However, the different works in [2]- [14] consider either a single RIS or multiple RISs at given locations, and have not addressed the multi-RISs deployment issue, which is practically important for RIS-assisted wireless systems. In this study, using BPP to simulate the RIS's locations, we develop the first comprehensive mathematical model accounting for spatial randomness of multiple RISs in generalized fading.…”

Section: Introductionmentioning

confidence: 99%

“…(2.53)], thereby evolving to (34) shown at the top of the next page. Similar to(14), the asymptotic outage probability of BPP distributed RIS-assisted networks is obtained by evaluating the residue at the points ζ l = (ζ 1 , . .…”

mentioning

confidence: 99%

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A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading

Trigui¹,

Ajib²,

Zhu³

2020

Preprint

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Leveraging on the reconfigurable intelligent surface (RIS) paradigm for enabling the next Internet of Things (IoT) and 6G era, this paper develops a comprehensive theoretical framework characterizing the performance of RIS-assisted communications in a plethora of propagation environments. We derive unified mathematical models for the outage probability and ergodic capacity of single and multiple-element RIS over Fox's H fading channel, which includes as special cases nearly all linear and non linear multi-path and shadowing fading models adopted in the open literature. For gleaning further insights, we capitalize on the algebraic asymptotic expansions of the H-transform to further analyze the outage probability and capacity at high signal-to-noise ratio (SNR) in a unified fashion. Asymptotic analysis shows two scaling rates of the outage probability at large average SNR. Moreover, by harnessing its tractability, the developed statistical machinery is employed to characterize the performance of multiple randomly distributed RIS-assisted communications over Fox's H fading channels. We show that the SNR grows as M α 2 N 2 when using M N -element RISs in generalized fading channels with path-loss exponent α.

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“…Under the same rationale of (4) and its asymptotic expansion in (14) while applying the arithmetic-quadratic inequality, i.e.…”

Section: B Diversity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading

Trigui¹,

Ajib²,

Zhu³

2020

Preprint

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show abstract

“…where alternating optimization algorithms were proposed under frequency-flat and frequencyselective channels. In [16], IRS performance gains were analyzed in a MIMO communication network. The effectiveness of the IRS was evaluated in [17] via experimental tests at 2.3 GHz and 28.5 GHz.…”

Section: A Prior Workmentioning

confidence: 99%

Capacity and Optimal Resource Allocation for IRS-assisted Multi-user Communication Systems

Mu,

Liu,

Guo

et al. 2020

Preprint

Self Cite

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This paper investigates intelligent reflecting surface (IRS)-assisted multi-user wireless communication systems, where an access point (AP) sends independent information to multiple users with the aid of one IRS. To determine the fundamental rate limits of these systems, we jointly optimize the IRS discrete phase-shift matrix and resource allocation for both orthogonal multiple access (OMA) and capacity-achieving non-orthogonal multiple access (NOMA) transmission schemes. The ergodic and delay-limited rate/capacity regions are characterized by invoking rate-profile techniques. For ergodic rate/capacity regions, as the formulated non-convex average sum rate maximization problems satisfy the time-sharing condition, we derive the optimal solutions for both transmission schemes using the Lagrange duality method. For OMA transmissions, the optimal solution unveils that each user should be alternatively served with its effective channel gain maximized by dynamically adjusting the IRS phase.

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Performance analysis for energy efficient communications aided by UAV with reconfigurable intelligent surface

Liu

Sun

2022

Int J Communication

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Summary The continuous growth of wireless connectivity and the emergence of the concept of the Internet of Everything in the future sixth‐generation (6G) network require a new communication paradigm. Different from the prior works that focus on performance optimization for communication networks, in this paper, we attempt to analyze the energy efficiency of unmanned aerial vehicles (UAVs) communication aided by reconfigurable intelligent surfaces (RIS) which is a new disruptive technology, for the reason that UAV has the line‐of‐sight (LoS) link transmission and flexibility and RIS has the low power for improving the communication reliability and network coverage. At firstly, when central limit theorem (CLT) assumption is used and the number of RIS reflecting elements is large, we derive the closed‐form expression of the average signal‐to‐interference‐plus‐noise ratio (SINR) of each user based on the new BS‐RIS‐user communication link and RIS‐user/BS association. Following this, we further gain the energy efficiency (EE) in closed‐form based on random access between BS and user. Finally, we further show the performance of EE under certain assumptions. In particular, the offered results demonstrate that the use of the RIS can significantly improve EE due to RIS assist in improving the SINR and has very low transmission power; meanwhile, the UAV equipped with RIS can also improve EE for the reason that RIS can be used as a mobile relay to take advantage of the LoS link transmission.

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MIMO Assisted Networks Relying on Intelligent Reflective Surfaces: A Stochastic Geometry Based Analysis

Cited by 48 publications

References 52 publications

A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading

A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading

Capacity and Optimal Resource Allocation for IRS-assisted Multi-user Communication Systems

Performance analysis for energy efficient communications aided by UAV with reconfigurable intelligent surface

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