Performance Analysis of IOS-Assisted NOMA System With Channel Correlation and Phase Errors

Wang, Tianxiong; Badiu, Mihai-Alin; Chen, Gaojie; Coon, Justin P.

doi:10.1109/tvt.2022.3193198

Cited by 21 publications

(14 citation statements)

References 42 publications

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“…An accurate asymptotic analysis of a STAR-RIS system over correlated channels constitutes an important question for further research. APPENDIX A First, the expectation of H t can be computed directly as We have proved the mathematical relationship between E[|ϖ t,i ||ϖ t,j |] and E[ϖ t,i ϖ * t,j ], ϖ ∈ {g, h} in [20], and the relationship is given in (10) and (11), where E[|ϖ t,i ||ϖ t,j |] and E[ϖ t,i ϖ * t,j ] are the (i, j) entry in matrices Rt and R t , respectively. Exploiting (10), (11) and (25), the variance of H t is obtained as in Proposition 1.…”

Section: Discussionmentioning

confidence: 99%

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Outage Probability Analysis of STAR-RIS Assisted NOMA Network With Correlated Channels

et al. 2022

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In this paper, we investigate the outage probability of a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted downlink non-orthogonal multiple access (NOMA) network over spatially correlated channels. To evaluate the impact of channel correlations on the system performance, we first approximate the distribution of the composite channel gain as a gamma random variable via a moment-matching approach and then derive new close-form outage probability expressions for a pair of NOMA users. Based on the approximate results, the diversity of each user is studied. Numerical results are provided to validate the effectiveness of the theoretical analysis and illustrate the performance loss due to channel correlations.

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Section: Discussionmentioning

confidence: 99%

“…Since phase errors exist in reality[17], this assumption gives a lower bound on the outage probability[18]. Further, only two-bit phase adjustment can achieve the performance close to the lower bound in practice[19],[20] 4. In this letter, we assume dt < dr.…”

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Outage Probability Analysis of STAR-RIS Assisted NOMA Network With Correlated Channels

et al. 2022

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“…To realize such a function, we need to carefully design these parameters to meet these requirements. In the literature, there are some initial investigations [79], [80]. The authors in [79] presented the impact of the number of possible phase shifts on the ergodic capacity for IOS-aided wireless communication systems.…”

Section: Discussionmentioning

confidence: 99%

“…Their results showed that a small number of phase shifts are sufficient enough to realize the potential of the IOS. In [80], the authors considered an IOS-aided non-orthogonal multiple access (NOMA) setting. Their simulation and theoretical results showed that low-precision elements with only four phase shifts can achieve performance close to that of ideal continuous phase shifts.…”

Section: Discussionmentioning

confidence: 99%

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Zhang

2022

IEEE Commun. Surv. Tutorials

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The development of metasurfaces has unlocked various use cases in wireless communication networks to improve performance by manipulating the propagation environment. Intelligent omni-surface (IOS), an innovative technique in this category, is proposed for coverage extension. In contrast to the widely studied reflective metasurfaces, i.e., intelligent reflecting surfaces (IRSs), which can only serve receivers located on the same side of the transmitter, the IOS can achieve full-dimensional wireless communications by enabling the simultaneous reflection and refraction of the surface, and thus users on both sides can be served. In this paper, we provide a comprehensive overview of the state-of-the-art in IOS from the perspective of wireless communications, with the emphasis on their design principles, channel modeling, beamforming design, experimental implementation and measurements, as well as possible applications in future cellular networks. We first describe the basic concepts of metasurfaces, and introduce the corresponding design principles for different types of metasurfaces. Moreover, we elaborate on the reflective-refractive model for each IOS element and the channel model for IOS-aided wireless communication systems. Furthermore, we show how to achieve full-dimensional wireless communications with the IOS for three different scenarios.In particular, we present the implementation of an IOS-aided wireless communication prototype and report its experimental measurement results. Finally, we outline some potential future directions and challenges in this area.

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“…The assumption on the ideal coherent phase adjustment gives an upper bound on the system performance[33]. Furthermore, as proved in[34],[35], only two-bit phase shifting leads to the performance close to upper bound in practice 5. Similar to[36]-[38], it is assumed that the horizontal distances of different channels are much larger than the vertical distances and the heights of TXs, RISs and UEs are ignored 6.…”

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Performance Analysis of RIS-Assisted Large-Scale Wireless Networks Using Stochastic Geometry

Wang¹,

Chen²,

Badiu³

et al. 2022

Preprint

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In this paper, we investigate the performance of a reconfigurable intelligent surface (RIS) assisted large-scale network by characterizing the coverage probability and the average achievable rate using stochastic geometry. Considering the spatial correlation between transmitters (TXs) and RISs, their locations are jointly modelled by a Gauss-Poisson process (GPP). Two association strategies, i.e., nearest association and fixed association, are both discussed. For the RIS-aided transmission, the signal power distribution with a direct link is approximated by a gamma random variable using a moment matching method, and the Laplace transform of the aggregate interference power is derived in closed form. Based on these expressions, we analyze the channel hardening effect in the RIS-assisted transmission, the coverage probability, and the average achievable rate of the typical user. We derive the coverage probability expressions for the fixed association strategy and the nearest association strategy in an interference-limited scenario in closed form. Numerical results are provided to validate the analysis and illustrate the effectiveness of RIS-assisted transmission with passive beamforming in improving the system performance. Furthermore, it is also unveiled that the system performance is independent of the density of TXs with the nearest association strategy in the interference-limited scenario.

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Performance Analysis of IOS-Assisted NOMA System With Channel Correlation and Phase Errors

Cited by 21 publications

References 42 publications

Outage Probability Analysis of STAR-RIS Assisted NOMA Network With Correlated Channels

Outage Probability Analysis of STAR-RIS Assisted NOMA Network With Correlated Channels

Intelligent Omni-Surfaces: Simultaneous Refraction and Reflection for Full-Dimensional Wireless Communications

Performance Analysis of RIS-Assisted Large-Scale Wireless Networks Using Stochastic Geometry

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