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基于SDNSR-Net深度网络的大规模MIMO信号检测算法
2022年电子技术应用第11期
曾相誌,申 滨,阳 建
重庆邮电大学 通信与信息工程学院,重庆400065
摘要: 大规模多输入多输出(MIMO)系统能有效地提高频谱效率,当天线规模渐进趋向于无穷时,最小均方误差(MMSE)检测算法能达到接近最优的检测性能。然而由于算法中存在矩阵求逆的步骤,带来极高的计算复杂度,在大规模MIMO系统中难以实现。理查森(Richardson)算法能够在不对矩阵求逆的情况下,以迭代的形式达到MMSE算法的检测性能,但该算法受其松弛参数影响较大。在结合最陡梯度下降算法的Richardson算法(SDNSR)中,松弛参数的误差可由梯度下降算法弥补,却提高了计算复杂度。首先通过深度展开的思想,将SDNSR的迭代过程映射为深度检测网络(SDNSR-Net);然后,通过修改网络结构及添加可训练参数来降低计算复杂度并提高检测精度。实验结果表明,在上行链路大规模MIMO系统中不同信噪比和天线配置的情况下,SDNSR-Net都优于其他典型的检测算法,可作为实际中有效的待选检测方案。
中圖分類號: TN925
文獻標識碼: A
DOI:10.16157/j.issn.0258-7998.222520
中文引用格式: 曾相誌,申濱,陽建. 基于SDNSR-Net深度網(wǎng)絡的大規(guī)模MIMO信號檢測算法[J].電子技術應用,2022,48(11):84-88.
英文引用格式: Zeng Xiangzhi,Shen Bin,Yang Jian. Signal detection based on SDNSR-Net deep network for massive MIMO systems[J]. Application of Electronic Technique,2022,48(11):84-88.
Signal detection based on SDNSR-Net deep network for massive MIMO systems
Zeng Xiangzhi,Shen Bin,Yang Jian
School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications, Chongqing 400065,China
Abstract: Massive multiple-input multiple-output(MIMO) systems can effectively improve the spectrum efficiency. When the antenna scale gradually tends to infinity, the minimum mean square error(MMSE) detection algorithm can achieve near-optimal detection performance. However, due to the matrix inversion required in the algorithm, which brings extremely high computational complexity, it is difficult to implement in a massive MIMO system. The Richardson algorithm can achieve the detection performance of the MMSE algorithm in an iterative form without matrix inversion, but the algorithm is greatly affected by its relaxation parameters. In the Richardson algorithm combined with the steepest gradient descent algorithm (SDNSR), the error of the relaxation parameter can be compensated by the gradient descent algorithm, but the computational complexity is increased. This paper firstly uses the idea of deep expansion to map the iterative process of SDNSR to a deep detection network (SDNSR-Net); then, by modifying the network structure and adding trainable parameters,the computational complexity is reduced and the detection accuracy is improved. The experimental results show that SDNSR-Net is superior to other typical detection algorithms in the case of different signal-to-noise ratios and antenna configurations in the uplink massive MIMO system and can be used as an effective detection scheme in practice.
Key words : massive MIMO system;signal detection;modern driven;deep learning

0 引言

    大規(guī)模MIMO系統(tǒng)中存在信道硬化現(xiàn)象,即由信道矩陣生成的Gram矩陣的對角項遠大于非對角項。在該情況下最小均方誤差(Minimum Mean Square Error,MMSE)檢測算法已證明可以達到次優(yōu)的檢測性能[1]。然而該算法中存在矩陣求逆運算,因此難以適用于大規(guī)模MIMO系統(tǒng)。

    為降低線性檢測算法的計算復雜度,出現(xiàn)了Richardson迭代[2]、Jacobi迭代[3]和逐次超松弛(Successive Over Relaxation,SOR)迭代[4]等迭代檢測算法。然而,在大規(guī)模MIMO系統(tǒng)中,隨著用戶增加,該類算法的檢測性能退化嚴重。

    深度學習技術作為一種流行的人工智能技術,目前已開始應用于解決信號檢測的問題。例如:Ye[5]等人提出利用深度神經(jīng)網(wǎng)絡進行OFDM系統(tǒng)的信道估計和信號檢測;Samuel[6]等人提出的DetNet通過將投影梯度下降算法的迭代過程展開為網(wǎng)絡,從而獲得了良好的檢測性能;He[7]等人提出了OAMPNet,在傳統(tǒng)的OAMP檢測算法的基礎上增加了一些可優(yōu)化參數(shù),在不增加額外復雜度的同時獲得了更好的檢測性能。




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作者信息:

曾相誌,申  濱,陽  建

(重慶郵電大學 通信與信息工程學院,重慶400065)




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