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Dynamic Frequency Selection (DFS) is the technology chosen by ETSI, FCC, and Industry Canada to provide unlicensed access for broadband radios in licensed bands. It may be viewed as a basic form of cognitive radio, where broadband radios share spectrum with radar users, and is implemented by the base station or base station/subscriber combination. This paper looks at the likelihood that a radar pulse burst can be detected in a Time-Division Duplexed (TDD) system with radar detection restricted to the base station. In such a system, a periodic 'quiet time' is enforced.
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