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arXiv 2106.04043cs.ITeess.SPmath.IT
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面向大规模 MIMO 系统的基于空洞卷积的 CSI 反馈压缩

Dilated Convolution based CSI Feedback Compression for Massive MIMO Systems

Shunpu Tang, Junjuan Xia, Lisheng Fan, Xianfu Lei, Wei Xu, Arumugam Nallanathan

AI总结:

针对大规模 MIMO 的 CSI 反馈开销问题,本文提出基于空洞卷积的 DCRNet,通过扩大感受野及优化编解码器,以更低 FLOPs 实现接近 SOTA 的 CSI 重建性能。

摘要:

尽管频分双工(FDD)大规模多输入多输出(MIMO)系统能够提供较高的频谱效率和能量效率,但它需要用户将下行链路信道状态信息(CSI)反馈给基站(BS),以便在 BS 处完成预编码设计。然而,大规模 MIMO 系统中 CSI 矩阵的维度很大,使 CSI 反馈极具挑战性,因此迫切需要压缩反馈的 CSI。为此,本文提出一种新颖的基于空洞卷积的 CSI 反馈网络,即 DCRNet。具体而言,空洞卷积用于在不增加卷积尺寸的情况下增强所提 DCRNet 的感受野(RF)。此外,本文设计了先进的编码器和解码器模块,以提升重建性能并降低计算复杂度。数值结果表明,所提 DCRNet 优于传统网络。特别是,DCRNet 能够以低得多的浮点运算量(FLOPs)达到几乎最先进(SOTA)的性能。本工作的开源代码和检查点可在 https://github.com/recusant7/DCRNet 获取。

英文摘要:

Although the frequency-division duplex (FDD) massive multiple-input multiple-output (MIMO) system can offer high spectral and energy efficiency, it requires to feedback the downlink channel state information (CSI) from users to the base station (BS), in order to fulfill the precoding design at the BS. However, the large dimension of CSI matrices in the massive MIMO system makes the CSI feedback very challenging, and it is urgent to compress the feedback CSI. To this end, this paper proposes a novel dilated convolution based CSI feedback network, namely DCRNet. Specifically, the dilated convolutions are used to enhance the receptive field (RF) of the proposed DCRNet without increasing the convolution size. Moreover, advanced encoder and decoder blocks are designed to improve the reconstruction performance and reduce computational complexity as well. Numerical results are presented to show the superiority of the proposed DCRNet over the conventional networks. In particular, the proposed DCRNet can achieve almost the state-of-the-arts (SOTA) performance with much lower floating point operations (FLOPs). The open source code and checkpoint of this work are available at https://github.com/recusant7/DCRNet.

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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