Two stage radio frequency interference cancellation system and method
First Claim
1. A radio frequency interference cancelling system, comprising:
- an input port configured to receive a plurality of radio frequency signals within a common radio frequency communication band;
a signal combiner, configured to receive the plurality of radio frequency signals within the common radio frequency communication band, and a cancellation signal, and produce a combined output signal;
a digitizer, configured to generate a digitized stream of data representing an amplitude of the combined output signal;
an adaptive signal cancellation processor, configured to;
generate the cancellation signal according to a set of estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band; and
iteratively estimate the phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band based on at least a correlation of a signal represented in the digitized stream of data and the estimated phase and amplitude characteristics of the at least one of the radio frequency signals, wherein in subsequent iterations, the estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band are modified to minimize a mean correlation; and
a demodulator configured to demodulate information from the digitized stream of data.
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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 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 radio frequency interference cancelling system, comprising:
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an input port configured to receive a plurality of radio frequency signals within a common radio frequency communication band; a signal combiner, configured to receive the plurality of radio frequency signals within the common radio frequency communication band, and a cancellation signal, and produce a combined output signal; a digitizer, configured to generate a digitized stream of data representing an amplitude of the combined output signal; an adaptive signal cancellation processor, configured to; generate the cancellation signal according to a set of estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band; and iteratively estimate the phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band based on at least a correlation of a signal represented in the digitized stream of data and the estimated phase and amplitude characteristics of the at least one of the radio frequency signals, wherein in subsequent iterations, the estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band are modified to minimize a mean correlation; and a demodulator configured to demodulate information from the digitized stream of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of cancelling radio frequency interference, comprising:
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receiving a plurality of radio frequency signals within a common radio frequency communication band; combining the plurality of radio frequency signals within the common radio frequency communication band, and a cancellation signal, and producing a combined output signal; digitizing an amplitude of the combined output signal to produce a digitized stream of data; adaptively generating the cancellation signal according to a set of estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band, and iteratively estimating the phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band based on at least a correlation of a signal represented in the digitized stream of data and the estimated phase and amplitude characteristics of the at least one of the radio frequency signals, wherein in subsequent iterations, the estimated phase and amplitude characteristics of at least one of the radio frequency signals within the common radio frequency communication band are modified to minimize a mean correlation; and demodulating information from the digitized stream of data. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for co-site interference suppression, comprising:
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receiving a plurality of radio frequency signals in a radio frequency communication band through an antenna, comprising at least one radio frequency signal which is interfering with at least one other radio frequency signal, and for which concurrent waveform parameters are available; combining the plurality of radio frequency signals, and a cancellation signal, to produce a combined output signal; digitizing an amplitude of the combined output signal to produce a digitized stream of data; adaptively generating the cancellation signal dependent on the concurrent waveform parameters, and iteratively estimating the phase and amplitude characteristics of the at least one radio frequency signal band based on at least a correlation of information represented in the digitized stream of data and the concurrent waveform parameters, wherein in subsequent iterations, the estimated phase and amplitude characteristics of at least one of the radio frequency signals are modified to minimize a mean correlation; and demodulating information from at least one other radio frequency signal in the digitized stream of data. - View Dependent Claims (19, 20)
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Specification