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- W3138360126 abstract "Channel modeling is a critical issue when designing or evaluating the performance of reconfigurable intelligent surface (RIS)-assisted communications. Inspired by the promising potential of learning-based methods for characterizing the radio environment, we present a general approach to model the RIS end-to-end equivalent channel using the unsupervised expectation-maximization (EM) learning algorithm. We show that an EM-based approximation through a simple mixture of two Nakagami-$m$ distributions suffices to accurately approximating the equivalent channel, while allowing for the incorporation of crucial aspects into RIS's channel modeling as spatial channel correlation, phase-shift errors, arbitrary fading conditions, and coexistence of direct and RIS channels. Based on the proposed analytical framework, we evaluate the outage probability under different settings of RIS's channel features and confirm the superiority of this approach compared to recent results in the literature." @default.
- W3138360126 created "2021-03-29" @default.
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- W3138360126 date "2021-03-24" @default.
- W3138360126 modified "2023-10-01" @default.
- W3138360126 title "Expectation-Maximization Learning for Wireless Channel Modeling of Reconfigurable Intelligent Surfaces" @default.
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