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arXiv 2409.08149eess.SP
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RIS辅助通信中基于深度学习的高效级联信道反馈

Efficient Deep Learning-based Cascaded Channel Feedback in RIS-Assisted Communications

Yiming Cui, Jiajia Guo, Chao-Kai Wen, Shi Jin

AI总结:

针对RIS辅助通信中级联信道时变特性难利用、反馈开销大的问题,提出基于深度学习的级联信道反馈框架,通过提取-压缩方案反馈信道时变特性,显著降低反馈与计算负担。

摘要:

在可重构智能表面(reconfigurable intelligent surface, RIS)辅助通信系统领域,基站(base station, BS)与用户设备(user equipment, UE)之间的连接由级联信道构成,该信道由BS-RIS信道和RIS-UE信道合并而成。由于BS和RIS位置固定而UE具有移动性,这两类信道通常呈现出不同的时变特性;考虑到单独信道估计存在难度,识别并利用这些特性以降低反馈开销是一项挑战。为解决这一问题,本文提出了一种专为级联信道反馈设计的创新深度学习框架,可巧妙捕捉级联信道的内在时变特性。当完整的级联信道已发送至BS后,该框架通过提取-压缩方案,在后续周期内反馈这种时变特性的高效表示。该方案包含RIS单元粒度的信道时变特性提取,随后采用基于自编码器(autoencoder)的深度压缩以提升紧凑度。数值仿真结果证实,该反馈框架可显著降低反馈负担与计算负担。

英文摘要:

In the realm of reconfigurable intelligent surface (RIS)-assisted communication systems, the connection between a base station (BS) and user equipment (UE) is formed by a cascaded channel, merging the BS-RIS and RIS-UE channels. Due to the fixed positioning of the BS and RIS and the mobility of UE, these two channels generally exhibit different time-varying characteristics, which are challenging to identify and exploit for feedback overhead reduction, given the separate channel estimation difficulty. To address this challenge, this letter introduces an innovative deep learning-based framework tailored for cascaded channel feedback, ingeniously capturing the intrinsic time variation in the cascaded channel. When an entire cascaded channel has been sent to the BS, this framework advocates the feedback of an efficient representation of this variation within a subsequent period through an extraction-compression scheme. This scheme involves RIS unit-grained channel variation extraction, followed by autoencoder-based deep compression to enhance compactness. Numerical simulations confirm that this feedback framework significantly reduces both the feedback and computational burdens.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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