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- Cognitive radio frequency spectrum detection-The spectrum sensing of a wideband frequency range is studied by dividing it into multiple subbands. It is assumed that in each subband either a primary user (PU) is active or absent in a additive white
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- AutoCAD作为一款强大的工程绘图软件,已经成为工程人员工作中不可缺少的重要工具。AutoCAD的主要命令方式是命令行,几乎所有的操作都可以通过相应的键盘命令来完成。除此之外,Autodesk公司还提供了丰富的快捷菜单和工具栏以提高用户的工作效率。-AutoCAD drawing as a powerful engineering software, has become the engineer an important and indispensable work tool. AutoCA