从编译程序中符号表的总体组织和表项属性信息组织来看，符号表是一种算法复杂性很高的数据结构，而且也不利于用户与图形界面的交互。

Symbol table is data structure which has high arithmetic complexity from whole structure and items' attribute information, and it is inconvenient for users to interact with graphic interface.

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我们称为维护问题，并提出恒定时问维护的概念，即维护问题算法的时间复杂性与数据库大小无关。

We propose a notion of constant time maintenance, according to which the maintenance algorithm runs in time independent of the size of the database state.

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与相干检测的天线选择相比，NON - AS算法不需要估计信道，大大降低了系统复杂性。

Compared with coherent antenna selection, the NON-AS algorithm do not require estimating channel state information, which greatly reduce system complexity.

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