Echelon-Ferrers is an important method to improve lower bounds for constant-dimension codes, which can be applied on various parameters. Fagang Li combined the linkage construction and echelon-Ferrers to obtain some new lower bounds of constant-dimension codes. In this letter, we generalize this linkage construction to obtain new lower bounds.

中文翻译：

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用Echelon-Ferrers改进等维码的联动结构

Echelon-Ferrers 是改进定维码下界的重要方法，可应用于各种参数。Fagang Li 结合链接构造和梯形费勒斯得到了一些新的定维码的下界。在这封信中，我们概括了这种链接结构以获得新的下界。