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In this letter, we propose a semantic communication scheme for wireless relaychannels based on Autoencoder, named AESC, which encodes and decodes sentencesfrom the semantic dimension. The Autoencoder module provides anti-noiseperformance for the system. Meanwhile, a novel semantic forward (SF) mode isdesigned for the relay node to forward the semantic information at the semanticlevel, especially for the scenarios that there is no common knowledge sharedbetween the source and destination nodes. Numerical results show that the AESCachieves better stability performance than the traditional communicationschemes, and the proposed SF mode provides a significant performance gaincompared to the traditional forward protocols.

Autoencoder-based Semantic Communication Systems with Relay Channels