Detection of Pulsed Radar in a Time Division Duplexed System

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 is implemented by the base-station or base-station/subscriber combination. In a time-division duplexed (TDD) system with DFS implemented solely at the base-station, a periodic 'quiet time' is enforced. This work determines the likelihood that a radar pulse train can be detected in a TDD system with radar detection restricted to the base-station. The results are tailored for TDD systems such as WiMAX, and can be used by designers to determine under what system constraints DFS can be implemented in their systems.