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Multi-RIS-Aided Wireless Systems: Statistical Characterization and Performance Analysis
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DOI：10.1109/TCOMM.2021.3117599.png)
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Abstract
En 中文
In this paper, we study the statistical characterization and modeling of distributed multi-reconfigurable intelligent surface (RIS)-aided wireless systems. Specifically, we consider a practical system model where the RISs with different geometric sizes are distributively deployed, and wireless channels associated to different RISs are assumed to be independent but not identically distributed (i.n.i.d.). We propose two purpose-oriented multi-RIS-aided schemes, namely, the exhaustive RIS-aided (ERA) and opportunistic RIS-aided (ORA) schemes. A mathematical framework, which relies on the method of moments, is proposed to statistically characterize the end-to-end (e2e) channels of these schemes. It is shown that either a Gamma distribution or a Log-Normal distribution can be used to approximate the distribution of the magnitude of the e2e channel coefficients in both schemes. With these findings, we evaluate the performance of the two schemes in terms of outage probability (OP) and ergodic capacity (EC), where tight approximate closed-form expressions for the OP and EC are derived. Representative results show that the ERA scheme outperforms the ORA scheme in terms of OP and EC. In addition, under i.n.i.d. fading channels, the reflecting element settings and location settings of RISs have a significant impact on the system performance of both the ERA or ORA schemes.
Keywords:
Wireless communication
Analytical models
Signal to noise ratio
Rayleigh channels
Performance analysis
Log-normal distribution
Gamma distribution
Reconfigurable intelligent surfaces (RIS)
multi-RIS
Gamma distribution
Log-Normal distribution
method of moments
ergodic capacity
outage probability
Journal
IF:
8.3
Papers:
1.2W
Citations:
3.6W
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Cited Papers
Performance Analysis of Reconfigurable Intelligent Surface-Assisted Wireless Systems and Comparison With Relaying.png)
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