The pulse transfer function matrix of linear discrete-time multivariable systems is often non-diagonal. This shows that there is coupling between the input and output of systems.
线性离散时间多变量系统的脉冲传递矩阵往往不是对角线形的矩阵，这表明系统的输入输出存在耦合。
The hierarchical identification principle is stated, and the hierarchical stochastic gradient (HSG) algorithm for the transfer function matrix (TFM) model for multivariable systems is presented.
阐述了递阶辨识原理，提出了传递函数阵模型参数的递阶随机梯度(hsg)辨识方法。
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