基于残差交叉注意力Transformer的深度联合信源信道编码多用户CSI反馈
Residual Cross-Attention Transformer-Based Multi-User CSI Feedback with Deep Joint Source-Channel Coding
AI总结:
本文提出一种基于残差交叉注意力Transformer和深度联合信源信道编码的多用户CSI反馈框架,利用用户相关性降低开销并提升反馈性能,实验证明其优越性。
摘要:
本文提出了一种用于大规模多输入多输出系统的基于深度学习(DL)的多用户信道状态信息(CSI)反馈框架,其中利用深度联合信源信道编码(DJSCC)来提高CSI重建精度。具体而言,我们设计了一个多用户联合CSI反馈框架,利用邻近用户之间的CSI相关性来降低反馈开销。在该框架下,我们提出了一种新的残差交叉注意力Transformer架构,部署在基站侧以进一步提升CSI反馈性能。此外,为解决传统比特级CSI反馈方法中的“悬崖效应”,我们将DJSCC集成到多用户CSI反馈中,并采用两阶段训练方案以适应变化的上行噪声水平。实验结果表明,我们的方法在CSI反馈性能上具有优越性,且网络复杂度低、可扩展性更好。
英文摘要:
This letter proposes a deep-learning (DL)-based multi-user channel state information (CSI) feedback framework for massive multiple-input multiple-output systems, where the deep joint source-channel coding (DJSCC) is utilized to improve the CSI reconstruction accuracy. Specifically, we design a multi-user joint CSI feedback framework, whereby the CSI correlation of nearby users is utilized to reduce the feedback overhead. Under the framework, we propose a new residual cross-attention transformer architecture, which is deployed at the base station to further improve the CSI feedback performance. Moreover, to tackle the "cliff-effect" of conventional bit-level CSI feedback approaches, we integrated DJSCC into the multi-user CSI feedback, together with utilizing a two-stage training scheme to adapt to varying uplink noise levels. Experimental results demonstrate the superiority of our methods in CSI feedback performance, with low network complexity and better scalability.
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