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US 8,078,130 B2Granted
Systems and methods for interference cancellation
AssigneeL-3 Communications Integrated Systems L.P.
InventorsGerald L. Fudge, Ross E. Bland, Antone L. Kusmanoff
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Abstract
Systems and methods for interference cancellation in which a first signal having a first frequency may be cancelled with a second frequency having a second and different (e.g., lower) frequency by employing sampling to cancel the first signal with the separate signal at the sample instances.
Claims24
An interference cancellation system configured to receive an analog input RF signal, said interference cancellation system comprising:
- cancel path circuitry comprising cancel path signal sampling circuitry and signal isolation circuitry;
- and
- signal path circuitry comprising signal path signal sampling circuitry;
- wherein said cancel path signal sampling circuitry is coupled to sample said analog input RF signal to produce an analog or digital cancel path selected sample IF signal, and wherein said signal isolation circuitry is coupled to receive said cancel path selected sample IF signal and to isolate a signal within said cancel path analog selected sample IF signal and to output said isolated signal as an analog cancellation IF signal having a different frequency than said analog input RF signal;
- and
- wherein said signal path circuitry is coupled to combine said analog input RF signal with said analog cancellation IF signal to create a modified analog input signal, wherein said signal path signal sampling circuitry is coupled to sample said modified analog input signal to produce a signal path analog or digital selected sample signal.
3 more elements
A method for canceling interference in an analog input RF signal, comprising:
- providing cancel path circuitry comprising cancel path signal sampling circuitry and signal isolation circuitry;
- providing signal path circuitry comprising signal path signal sampling circuitry;
- providing said analog input RF signal to said signal path circuitry and said cancel path circuitry;
- utilizing said cancel path signal sampling circuitry to sample said analog input RF signal to produce an analog or digital cancel path selected sample IF signal;
- utilizing said signal isolation circuitry to isolate a signal within said analog or digital cancel path selected sample IF signal and to output said isolated signal as an analog cancellation IF signal having a different frequency than said analog input RF signal;
- combining said analog input RF signal with said analog cancellation IF signal to create a modified analog input signal;
- and
- utilizing said signal path signal sampling circuitry to sample said modified analog input signal to produce a signal path analog or digital selected sample signal.
5 more elements
Dependencies are inferred from the claim text.