Two stage radio frequency interference cancellation system and method
First Claim
1. A system for suppressing interference with a received information-bearing radio frequency signal by an interfering radio frequency signal, comprising:
- an input port configured to receive a radio frequency signal comprising the information-bearing radio frequency signal and the interfering radio frequency signal within an overlapping range of frequencies;
an estimator, configured to estimate phase and amplitude characteristics of the interfering radio frequency signal;
a signal generator, configured to generate a cancellation signal, based on the estimated phase and amplitude characteristics of the interfering radio frequency signal;
a combiner, configured to combine the cancellation signal with the received radio frequency signal, to produce an interference-suppressed radio frequency signal;
a digitizer, configured to digitize the interference-suppressed radio frequency signal, having a digitizer dynamic range, to produce a digitized signal, wherein;
a dynamic range of the digitizer required to demodulate information from the information-bearing radio frequency signal within the received radio frequency signal is in excess of the digitizer dynamic range, anda dynamic range of the digitizer required to demodulate an information from the information-bearing radio frequency signal within the interference-suppressed radio frequency signal is below the digitizer dynamic range; and
a demodulator configured to demodulate the information from the information-bearing radio frequency signal from the digitized signal.
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Abstract
A radio frequency receiver subject to a large in-band interferor employs active cancellation with coarse and at least one fine cancellation signal, each with a respective radio frequency combiner, in order to increase the effective dynamic range of the receiver for weak signals of interest. One or both can be digitally synthesized. This is particularly applicable for co-site interference, whereby the interfering transmit signal is directly accessible. A similar system and method may also be applied to external interferors such as those produced by deliberate or unintentional jamming signals, or by strong multipath signals. An adaptive algorithm may be used for dynamic delay and gain matching. In a preferred embodiment, a hybrid technology hybrid temperature system incorporates both superconducting and semiconducting components to achieve enhanced broadband performance.
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Citations
20 Claims
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1. A system for suppressing interference with a received information-bearing radio frequency signal by an interfering radio frequency signal, comprising:
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an input port configured to receive a radio frequency signal comprising the information-bearing radio frequency signal and the interfering radio frequency signal within an overlapping range of frequencies; an estimator, configured to estimate phase and amplitude characteristics of the interfering radio frequency signal; a signal generator, configured to generate a cancellation signal, based on the estimated phase and amplitude characteristics of the interfering radio frequency signal; a combiner, configured to combine the cancellation signal with the received radio frequency signal, to produce an interference-suppressed radio frequency signal; a digitizer, configured to digitize the interference-suppressed radio frequency signal, having a digitizer dynamic range, to produce a digitized signal, wherein; a dynamic range of the digitizer required to demodulate information from the information-bearing radio frequency signal within the received radio frequency signal is in excess of the digitizer dynamic range, and a dynamic range of the digitizer required to demodulate an information from the information-bearing radio frequency signal within the interference-suppressed radio frequency signal is below the digitizer dynamic range; and a demodulator configured to demodulate the information from the information-bearing radio frequency signal from the digitized signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for suppressing interference with a received information-bearing radio frequency signal by an interfering radio frequency signal, comprising:
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receiving a radio frequency signal comprising the information-bearing radio frequency signal and the interfering radio frequency signal within an overlapping range of frequencies; automatically estimating phase and amplitude characteristics of the interfering radio frequency signal; automatically generating a cancellation signal, based on the estimated phase and amplitude characteristics of the interfering radio frequency signal; combining the cancellation signal with the received radio frequency signal, to produce an interference-suppressed radio frequency signal; digitizing the interference-suppressed radio frequency signal to produce a digitized signal, with a digitizer having a digitizer dynamic range, wherein; a dynamic range of the digitizer required to demodulate information from the information-bearing radio frequency signal within the received radio frequency signal is in excess of the digitizer dynamic range, and a dynamic range of the digitizer required to demodulate an information from the information-bearing radio frequency signal within the interference-suppressed radio frequency signal is below the digitizer dynamic range; and demodulating the information from the information-bearing radio frequency signal from the digitized signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system for suppressing interference with a received broadband radio frequency signal by an interfering radio frequency signal within a band of the broadband radio frequency signal, comprising:
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an input port configured to receive the broadband radio frequency signal comprising the interfering radio frequency signal; an estimator, configured to estimate sufficient phase and amplitude characteristics of the interfering radio frequency signal to define a cancellation signal; a signal generator, configured to generate the cancellation signal, based on the estimated sufficient phase and amplitude characteristics of the interfering radio frequency signal; a combiner, configured to combine the cancellation signal with the received radio frequency signal substantially without distortion within the band, to produce an interference-suppressed broadband radio frequency signal; a broadband digitizer, configured to digitize the interference-suppressed broadband radio frequency signal, wherein the broadband digitizer has insufficient dynamic range to digitize the broadband radio frequency signal with the interfering radio frequency signal for extraction of information from an information-containing component of the broadband radio frequency signal, and the broadband digitizer has sufficient dynamic range to digitize the interference-suppressed broadband radio frequency signal for extraction of the information from the information-containing component of the broadband radio frequency signal. - View Dependent Claims (20)
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Specification