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arXiv 2201.07943eess.SP
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基于1比特CS的双向通道互易叠加CSI反馈融合学习

Fusion Learning for 1-Bit CS-based Superimposed CSI Feedback with Bi-Directional Channel Reciprocity

Chaojin Qing, Qing Ye, Wenhui Liu, Jiafan Wang

摘要:

由于丢弃下行信道状态信息(CSI)幅度和采用迭代重构算法,基于1比特压缩感知(CS)的叠加CSI反馈存在恢复精度低和处理时延大的问题。为了克服这些缺点,这封信提出了一种融合学习方案,利用双向信道互易性。具体地说,利用传统下行链路CSI重构的简化版本来提取下行链路CSI的初始特征,并且设计基于单隐层的幅度学习网络(AMPL-NET)来学习下行链路CSI幅度的辅助特征。然后,基于提取和学习的幅度特征,一个简单但有效的幅度融合网络(AMPF-NET)被开发来执行下行链路CSI的幅度融合,从而提高了重建精度为1比特的基于CS的叠加CSI反馈,同时减少处理延迟。仿真结果表明了所提出的反馈方案的有效性和对参数变化的鲁棒性。

英文摘要:

Due to the discarding of downlink channel state information (CSI) amplitude and the employing of iteration reconstruction algorithms, 1-bit compressed sensing (CS)-based superimposed CSI feedback is challenged by low recovery accuracy and large processing delay. To overcome these drawbacks, this letter proposes a fusion learning scheme by exploiting the bi-directional channel reciprocity. Specifically, a simplified version of the conventional downlink CSI reconstruction is utilized to extract the initial feature of downlink CSI, and a single hidden layer-based amplitude-learning network (AMPL-NET) is designed to learn the auxiliary feature of the downlink CSI amplitude. Then, based on the extracted and learned amplitude features, a simple but effective amplitude-fusion network (AMPF-NET) is developed to perform the amplitude fusion of downlink CSI and thus improves the reconstruction accuracy for 1-bit CS-based superimposed CSI feedback while reducing the processing delay. Simulation results show the effectiveness of the proposed feedback scheme and the robustness against parameter variations.

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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