Task-Oriented Semantic Communication With Adaptive Semantic Reconstruction Network

In recent years, semantic communication has garnered significant attention for its potential to address challenges in traditional communication systems. However, in complex communication environments, semantic communication still faces challenges, such as semantic information loss, low transmission efficiency, and poor adaptability. This article proposes a novel semantic communication with adaptive semantic reconstruction (SCASR) scheme to enhance transmission efficiency and adaptability in complex communication environments. First, a compression mechanism based on semantic importance is designed to achieve flexible and efficient semantic compression. Then, we develop an adaptive semantic reconstruction network to predict and reconstruct lost semantic information. Finally, we integrate an attention mechanism into the reconstruction network, dynamically adjusting parameter weights based on signal-to-noise ratio (SNR), semantic compression rate (SCR), and packet loss rate (PLR) to improve reconstruction quality and adaptability. To evaluate the efficiency of SCASR, we conduct extensive simulation experiments on semantic segmentation tasks using the Cityscapes dataset. Results demonstrate that SCASR outperforms existing semantic communication and traditional schemes, offering higher mean Intersection over Union (mIoU), and enhanced semantic transmission benefit (STB).