单词	cognitive radio
释义	cognitive radio noun : a system of wireless communication allowing a device to automatically detect an open or unused radio frequency and switch to it in order to improve performance This strategy would allow a portable radio receiver to monitor a wide swath of the spectrum at all times without swiftly burning through its batteries. That will be important in the much-anticipated world of cognitive radio, in which our handsets become agile enough to exploit frequencies that are fair game only when a higher-priority user hasn't claimed them. Clark T.-C. Nguyen, IEEE Spectrum, 12 Dec. 2009 For example, if the government has reserved some spectrum for use at an Air Force bombing range, but no bombing is happening on a particular day, cognitive radio could allow a phone to sense the open channel and switch to it. Brian X. Chen, The New York Times, 7 June 2012 Word History First Known Use 1999, in the meaning defined above
随便看	Lindera linderae linderas Linderman joint Lindesnes lindgrenite lindheimerae lindheimeras lindies lindisfarne Lindley lindleyan lindo lindorm linds Lindsay Lindsey, Parts of Lindstromite lindströmite lindworm Lindy line line ahead line block line bonus

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