Model-free Reinforcement Learning of Semantic Communication by Stochastic Policy Gradient

• URL: http://arxiv.org/abs/2305.03571v2
• Date: Thu, 14 Mar 2024 15:54:10 GMT
• Title: Model-free Reinforcement Learning of Semantic Communication by Stochastic Policy Gradient
• Authors: Edgar Beck, Carsten Bockelmann, Armin Dekorsy,
• Abstract summary: The idea of semantic communication by Weaver from 1949 has gained attention. We apply the Policy Gradient (SPG) to design a semantic communication system. We derive the use of both classic and semantic communication from the mutual information between received and target variables.
• Score: 9.6403215177092
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Following the recent success of Machine Learning tools in wireless communications, the idea of semantic communication by Weaver from 1949 has gained attention. It breaks with Shannon's classic design paradigm by aiming to transmit the meaning, i.e., semantics, of a message instead of its exact version, allowing for information rate savings. In this work, we apply the Stochastic Policy Gradient (SPG) to design a semantic communication system by reinforcement learning, separating transmitter and receiver, and not requiring a known or differentiable channel model -- a crucial step towards deployment in practice. Further, we derive the use of SPG for both classic and semantic communication from the maximization of the mutual information between received and target variables. Numerical results show that our approach achieves comparable performance to a model-aware approach based on the reparametrization trick, albeit with a decreased convergence rate.

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