Abstract
Reconfigurable intelligent surfaces (RISs) are software-controlled passive devices that can be used as relay $(R)$ systems to reflect incoming signals from a source $(S)$ to a destination $(D)$ in a cooperative manner with optimum signal strength to improve the performance of wireless communication networks. The configurability and flexibility of an RIS deployed in an Internet of Things (IoT)-based network can enable network designers to devise stand-alone or cooperative configurations that have considerable advantages over conventional networks. In this article, two new deep neural network (DNN)-assisted cooperative RIS (CRIS) models, namely, DNN $_{R} -$ CRIS and DNN $_{R, D} -$ CRIS, are proposed for cooperative communications. In DNN $_{R} -$ CRIS model, the potential of RIS deployment as an IoT-based relay element in a next-generation cooperative network is investigated using deep-learning (DL) techniques for RIS phase optimization. In addition, to reduce the maximum-likelihood (ML) complexity at $D$ , a new DNN-based symbol detection method is presented with the DNN $_{R, D} -$ CRIS model combined with DNN-assisted phase optimization. For a different number of relays and receiver configurations, the bit error rate (BER) performance results of the proposed DNN $_{R} -$ CRIS and DNN $_{R, D} -$ CRIS models and traditional CRIS scheme (without a DNN) are presented for a multirelay cooperative communication scenario with path loss effects. It is revealed that the proposed DNN-based models show promising results in terms of BER, even in high-noise environments with low system complexity.
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