Two stage radio frequency interference cancellation system and method
First Claim
1. An electromagnetic radiation receiving method, comprising:
- modeling at least one signal within an electromagnetic radiation band;
generating at least one digital reference signal corresponding to the modeled at least one signal;
converting the at least one digital reference signal to at least one corresponding analog reference signal, wherein at least a delay and a magnitude of the at least one corresponding analog reference signal are controllable;
combining a received waveform within the electromagnetic radiation band containing the at least one signal and an information carrier with the at least one corresponding analog reference signal in a first analog combiner to generate a first residue signal, at least the delay and magnitude of the at least one corresponding analog reference signal being controlled such that a magnitude of the at least one signal within the first residue signal is reduced with respect to the received waveform and the information carrier is substantially undistorted;
generating at least one cancellation signal, corresponding to a residue of the at least one signal in the residue signal, controllable with respect to at least waveform, magnitude and delay based on a feedback input;
combining the first residue signal with the at least one cancellation signal in a second combiner to generate a second residue signal; and
generating the feedback input based on at least the second residue signal to control said generating the at least one cancellation signal with respect to at least waveform, magnitude, and delay and, such that a magnitude of the at least one signal within the second residue signal is reduced with respect to the first residue signal and the information carrier is substantially undistorted.
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Accused Products
Abstract
A radio frequency receiver subject to a large in-band interferor employs active cancellation with coarse and at least one cancellation signals, 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
21 Claims
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1. An electromagnetic radiation receiving method, comprising:
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modeling at least one signal within an electromagnetic radiation band; generating at least one digital reference signal corresponding to the modeled at least one signal; converting the at least one digital reference signal to at least one corresponding analog reference signal, wherein at least a delay and a magnitude of the at least one corresponding analog reference signal are controllable; combining a received waveform within the electromagnetic radiation band containing the at least one signal and an information carrier with the at least one corresponding analog reference signal in a first analog combiner to generate a first residue signal, at least the delay and magnitude of the at least one corresponding analog reference signal being controlled such that a magnitude of the at least one signal within the first residue signal is reduced with respect to the received waveform and the information carrier is substantially undistorted; generating at least one cancellation signal, corresponding to a residue of the at least one signal in the residue signal, controllable with respect to at least waveform, magnitude and delay based on a feedback input; combining the first residue signal with the at least one cancellation signal in a second combiner to generate a second residue signal; and generating the feedback input based on at least the second residue signal to control said generating the at least one cancellation signal with respect to at least waveform, magnitude, and delay and, such that a magnitude of the at least one signal within the second residue signal is reduced with respect to the first residue signal and the information carrier is substantially undistorted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electromagnetic radiation receiver, comprising:
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at least one digital processor configured to model at least one signal within an electromagnetic radiation band and generating at least one digital reference signal corresponding to the modeled at least one signal, wherein at least a delay and a magnitude of the at least one corresponding analog reference signal are controllable; an analog component configured to convert an output of the digital processor of the generated at least one digital reference signal to at least one corresponding analog reference signal; a first analog combiner configured to combine a received waveform within the electromagnetic radiation band containing the at least one signal and an information carrier, with the at least one corresponding analog reference signal, to generate a first residue signal, at least the delay and magnitude of the at least one corresponding analog reference signal being controllable such that a magnitude of the at least one signal within the first residue signal is reduced with respect to the received waveform and the information carrier is substantially undistorted; a second combiner configured to combine the first residue signal with at least one cancellation signal to generate a second residue signal; and the at least one digital processor being further configured to generate the at least one cancellation signal, corresponding to a residue of the at least one signal in the residue signal, controlled with respect to at least waveform, magnitude and delay based on a feedback input from the second residue signal, such that a magnitude of the at least one signal within the second residue signal is reduced with respect to the first residue signal and the information carrier is substantially undistorted. - View Dependent Claims (15, 16, 17, 18)
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19. A receiver, comprising:
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(a) an input configured to receive an analog signal comprising an information carrier and at least one signal within an electromagnetic radiation band; (b) a first combiner configured to combine the analog signal with a first signal to produce a first combined signal with a reduced power of the at least one signal with respect to the input, substantially without distortion of the information carrier; (c) a second combiner configured to combine the first combined signal, received by the second combiner substantially without introduction of intermodulation product of the analog signal and the first signal, with a second signal to produce a second combined signal with a reduced power of the at least one signal with respect to the first combined signal, substantially without distortion of the information carrier; (d) a digitizer, configured to digitize the second combined signal while substantially retaining information corresponding to the information carrier; and (e) a feedback controlled signal generator, configured to receive a representation of the digitized second combined signal, and control a generation of at least one of the first signal and the second signal. - View Dependent Claims (20, 21)
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Specification