给出l -极小系统的定义，这样定义的L -极小系统在两个方面分别有相对性和绝对性。
We give the definition of L-minimal system, point out that the minimal systems defined by the definition have the absoluteness and relativity in two aspects respectively.
进一步，在问题有解时，通过极小化增益矩阵元素绝对值的和，给出了求解期望低成本输出反馈控制的算法。
Then following the existing path-following method for solving BMI problem, an iterative LMI algorithm is proposed to locally search the desired output-feedback gain.
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