Interference cancellation for reconfigurable direct RF bandpass sampling interference cancellation
First Claim
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1. 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 and upconversion 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 a cancel path analog or digital selected sample IF signal, and wherein said signal isolation and upconversion circuitry is coupled to receive said cancel path selected sample IF signal and to isolate and upconvert a signal within said cancel path analog or digital selected sample IF signal and to output said isolated signal as an analog cancellation RF signal;
wherein said signal path circuitry is coupled to combine said analog input RF signal with said analog cancellation RF 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.
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Abstract
Sampling may be employed to cancel an analog input radio frequency (RF) signal by using an upconverted analog cancellation RF signal to cancel the analog input RF signal at the sample instances. At least two sampling paths may be employed, a signal path and a cancel path, and direct RF bandpass sampling may be included in both the signal and cancel paths.
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Citations
30 Claims
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1. An interference cancellation system configured to receive an analog input RF signal, said interference cancellation system comprising:
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cancel path circuitry comprising cancel path signal sampling circuitry and signal isolation and upconversion 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 a cancel path analog or digital selected sample IF signal, and wherein said signal isolation and upconversion circuitry is coupled to receive said cancel path selected sample IF signal and to isolate and upconvert a signal within said cancel path analog or digital selected sample IF signal and to output said isolated signal as an analog cancellation RF signal; wherein said signal path circuitry is coupled to combine said analog input RF signal with said analog cancellation RF 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 23, 24, 25, 26)
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12. A method for canceling interference in an analog input RF signal, comprising:
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providing cancel path circuitry comprising cancel path signal sampling circuitry and signal isolation and upconversion 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 and upconversion circuitry to isolate and upconvert a signal within said analog or digital cancel path selected sample IF signal and to output said isolated signal as an analog cancellation RF signal; combining said analog input RF signal with said analog cancellation RF 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 27, 28, 29, 30)
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Specification