Patent ID: 8660219

Claim:
A circuit for determining whether an input signal is an orthogonally frequency division multiplexed (OFDM) signal or a radar signal, the circuit having an input terminal for receiving the input signal and comprising: at least first and second bandpass filters connected to the input terminal and each having a passband of width substantially less than a relatively large instantaneous bandwidth that characterizes the OFDM signal and substantially greater than a relatively small instantaneous bandwidth that characterizes the radar signal, the passbands of the first and second filters being substantially non-overlapping, whereby an output signal of the first filter is independent of an output signal of the second filter, a first multiplier for calculating a power level of the output signal of the first filter, a second multiplier for calculating a power level of the output signal of the second filter, a third multiplier for multiplying the power level of the output signal of the first filter with the power level of the output signal of the second filter to form a power product signal, and a power level comparator for comparing a power level of the power product signal with a threshold level and providing an indicating signal in a first state if the power level of the power product signal exceeds the threshold level and otherwise providing said indicating signal in a second state.