论文标题
通过合作接力网络进行深度联合源通道编码
Deep Joint Source-Channel Coding Over Cooperative Relay Networks
论文作者
论文摘要
本文提出了一种新型的深关节源通道编码（DEEPJSCC）方案，用于在半双层合作中继通道上传输图像。具体而言，我们将DEEPJSCC应用于合作通信的两种基本模式，即放大和前向（AF）和解码（DF）。在DeepJSCC-AF中，继电器只是放大并转发其接收的信号。另一方面，在DeepJSCC-DF中，继电器首先重建传输图像，然后在转发之前对其进行重新编码。考虑到DeepJSCC-DF的过度计算开销用于恢复继电器上的图像，我们提出了一种称为DeepJSCC-PF的替代方案，在该方案中，继电器过程并转发其接收的信号，而无需恢复图像。仿真结果表明，拟议的DEEPJSCC-AF，DF和PF方案优于具有极地代码的BPG压缩的数字基线，并提供了优美的性能降低，并且通道质量恶化。进一步的研究表明，随着源和继电器之间的通道条件的改善，DEEPJSCC-DF/PF对DEEPJSCC-AF的PSNR增益改善。此外，DEEPJSCC-PF方案的性能与DeepJSCC-DF的相似性能具有较低的计算复杂性。
This paper presents a novel deep joint source-channel coding (DeepJSCC) scheme for image transmission over a half-duplex cooperative relay channel. Specifically, we apply DeepJSCC to two basic modes of cooperative communications, namely amplify-and-forward (AF) and decode-and-forward (DF). In DeepJSCC-AF, the relay simply amplifies and forwards its received signal. In DeepJSCC-DF, on the other hand, the relay first reconstructs the transmitted image and then re-encodes it before forwarding. Considering the excessive computation overhead of DeepJSCC-DF for recovering the image at the relay, we propose an alternative scheme, called DeepJSCC-PF, in which the relay processes and forwards its received signal without necessarily recovering the image. Simulation results show that the proposed DeepJSCC-AF, DF, and PF schemes are superior to the digital baselines with BPG compression with polar codes and provides a graceful performance degradation with deteriorating channel quality. Further investigation shows that the PSNR gain of DeepJSCC-DF/PF over DeepJSCC-AF improves as the channel condition between the source and relay improves. Moreover, DeepJSCC-PF scheme achieves a similar performance to DeepJSCC-DF with lower computational complexity.
