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Continuous-wave radar
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====Null==== The null approach takes two signals: * A sample of the transmit signal leaking into the receiver * A sample of the actual transmit signal The actual transmit signal is rotated 180 degrees, attenuated, and fed into the receiver. The phase shift and attenuation are set using feedback obtained from the receiver to cancel most of the leakage. Typical improvement is on the order of 30 dB to 70 dB.
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