Mohammad, Abdullahi; Masouros, Christos; Andreopoulos, Yiannis; (2023) An Unsupervised Deep Unfolding Framework for Robust Symbol Level Precoding. IEEE Open Journal of the Communications Society 10.1109/ojcoms.2023.3270455. (In press).

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Abstract

Symbol Level Precoding (SLP) has attracted significant research interest due to its ability to exploit interference for energy-efficient transmission. This paper proposes an unsupervised deep-neural network (DNN) based SLP framework. Instead of naively training a DNN architecture for SLP without considering the specifics of the optimization objective of the SLP domain, our proposal unfolds a power minimization SLP formulation based on the interior point method (IPM) proximal ‘log’ barrier function. Furthermore, we extend our proposal to a robust precoding design under channel state information (CSI) uncertainty. The results show that our proposed learning framework provides near-optimal performance while reducing the computational cost from O(n7.5) to O(n3) for the symmetrical system case where n=numberoftransmitantennas=numberofusers. This significant complexity reduction is also reflected in a proportional decrease in the proposed approach’s execution time compared to the SLP optimization-based solution.

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