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arXiv 1707.09097cs.ITmath.IT
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mmWave系统中基于稀疏图像重建技术的波束域信道估计

Beamspace Channel Estimation in mmWave Systems via Cosparse Image Reconstruction Technique

Jie Yang, Chao-Kai Wen, Shi Jin, Feifei Gao

摘要:

研究了毫米波通信系统中三维透镜天线阵的波束域信道估计问题。我们分析了三维透镜天线阵列的聚焦能力和波束空间信道响应矩阵的稀疏性。考虑到分析,我们观察到信道矩阵可以被视为2D自然图像;也就是说,信道是稀疏的,并且相邻元素之间的变化是微妙的。因此,对于信道估计,我们采用了一种图像重建技术,称为稀疏非信息参数估计器为基础的cosparse分析AMP成像(SCAMPI)算法。SCAMPI算法比诸如正交匹配追踪和支持检测算法的早期算法更快且更准确。为了进一步改进SCAMPI算法,我们将信道分布建模为通用的高斯混合(GM)概率,并将期望最大化学习算法嵌入SCAMPI算法中学习GM概率中的参数。我们表明,GM概率优于常见的均匀分布用于图像重建。我们还提出了一个移相器减少选择网络结构,以减少系统的功耗,并证明了SCAMPI算法是强大的,即使移相器的数量减少了10%。

英文摘要:

This paper considers the beamspace channel estimation problem in 3D lens antenna array under a millimeter-wave communication system. We analyze the focusing capability of the 3D lens antenna array and the sparsity of the beamspace channel response matrix. Considering the analysis, we observe that the channel matrix can be treated as a 2D natural image; that is, the channel is sparse, and the changes between adjacent elements are subtle. Thus, for the channel estimation, we incorporate an image reconstruction technique called sparse non-informative parameter estimator-based cosparse analysis AMP for imaging (SCAMPI) algorithm. The SCAMPI algorithm is faster and more accurate than earlier algorithms such as orthogonal matching pursuit and support detection algorithms. To further improve the SCAMPI algorithm, we model the channel distribution as a generic Gaussian mixture (GM) probability and embed the expectation maximization learning algorithm into the SCAMPI algorithm to learn the parameters in the GM probability. We show that the GM probability outperforms the common uniform distribution used in image reconstruction. We also propose a phase-shifter-reduced selection network structure to decrease the power consumption of the system and prove that the SCAMPI algorithm is robust even if the number of phase shifters is reduced by 10%.

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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