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arXiv 2505.04432eess.SP
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大规模MIMO系统中用于时-空-频域CSI压缩的SwinLSTM自编码器

SwinLSTM Autoencoder for Temporal-Spatial-Frequency Domain CSI Compression in Massive MIMO Systems

Aakash Saini, Yunchou Xing, Jee Hyun Kim, Amir Ahmadian Tehrani, Wolfgang Gerstacker

AI总结:

本文针对大规模MIMO系统中CSI反馈开销大的问题,提出一种参数轻量、低复杂度的SwinLSTM循环自编码器,联合利用时-空-频三域相关性进行CSI压缩与重构,在降低反馈开销的同时避免传统TSF架构参数和计算复杂度高的问题。

摘要:

本研究提出了一种参数轻量、低复杂度的人工智能/机器学习(AI/ML)模型,通过联合利用时间、空间和频率(TSF)域相关性来增强无线系统中的信道状态信息(CSI)反馈。传统框架在空间-频率(SF)域使用自编码器在用户设备(UE)侧进行CSI压缩并在网络(NW)侧重构,而低移动性场景下的大规模多输入多输出(mMIMO)系统除了频率和空间相关性外,还表现出强时间相关性。仅靠自编码器架构不足以利用CSI中的TSF域相关性,还需要循环元件。为解决梯度消失问题,近期研究提出了最先进的TSF域CSI压缩架构,将用于时间相关性利用的循环网络与处理SF域CSI压缩的深度预训练自编码器相结合。然而,这种方法增加了参数数量和计算复杂度。为联合利用TSF域的相关性,我们提出了一种新颖的、参数轻量、低复杂度的基于AI/ML的循环自编码器架构,在UE侧压缩CSI并在NW侧重构,同时最小化CSI反馈开销。

英文摘要:

This study presents a parameter-light, low-complexity artificial intelligence/machine learning (AI/ML) model that enhances channel state information (CSI) feedback in wireless systems by jointly exploiting temporal, spatial, and frequency (TSF) domain correlations. While traditional frameworks use autoencoders for CSI compression at the user equipment (UE) and reconstruction at the network (NW) side in spatial-frequency (SF), massive multiple-input multiple-output (mMIMO) systems in low mobility scenarios exhibit strong temporal correlation alongside frequency and spatial correlations. An autoencoder architecture alone is insufficient to exploit the TSF domain correlation in CSI; a recurrent element is also required. To address the vanishing gradients problem, researchers in recent works have proposed state-of-the-art TSF domain CSI compression architectures that combine recurrent networks for temporal correlation exploitation with deep pre-trained autoencoder that handle SF domain CSI compression. However, this approach increases the number of parameters and computational complexity. To jointly utilize correlations across the TSF domain, we propose a novel, parameter-light, low-complexity AI/ML-based recurrent autoencoder architecture to compress CSI at the UE side and reconstruct it on the NW side while minimizing CSI feedback overhead.

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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