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US 6,724,840 B1Granted
Adaptive interference cancellation method
AssigneeThe Aerospace Corporation
InventorsSamuel S. Osofsky, Paul E. Hanson
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AssigneeThe Aerospace Corporation
InventorsSamuel S. Osofsky, Paul E. Hanson
Estimating the term…
The design and performance of an analog cancellation system is presented. The system generates either narrow or wideband nulls in order to minimize the effect of interfering signals on a receiver. A microcontroller directs the detection and classification of the interfering signal relative to frequency, amplitude and modulation, such as pulse-width or continuous wave modulation. A sampled version of the interfering signal at frequency, fi, is phase-inverted, amplified, and vector-summed with the input signal stream to null the interfering signal at fi. The microcontroller also monitors and adjusts the cancellation systems' circuit parameters to minimize any residual interfering signal at fi or respond to changes in the interference. The example system operates from 100-160 MHz, and can generate wideband nulls over a 5MHz bandwidth with a 15dB depth attenuation or narrowband nulls with a Q greater than 200, and with a null depth greater than 30dB.
A method of canceling an undesired signal from an input signal, the method comprising the steps of,
A method of canceling an undesired signal from an input signal, the method comprising the steps of,
Dependencies are inferred from the claim text.