本文首先综述了认知无线电的基本原理，包括其定义、概念模型、主要功能和关键技术。

Firstly, this dissertation summarizes fundamental notions of cognitive radios, including its definition, concept model, main functions and important technologies.

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此外，您不能更改全局变量定义，包括其默认值。

Furthermore, you cannot ALTER the global variable definition at all, including its default value.

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然后，定义集群，包括对其进行适当命名。

Then, define the cluster, including naming it appropriately.

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