Method and circuit for non-cooperative interference suppression of radio frequency signals
First Claim
1. A circuit for separating a radio frequency signal of interest from an interfering signal, said circuit comprising:
- means for receiving a composite signal and for producing first and second signals, said first signal being representative of the composite signal and said second signal being representative of the envelope of the composite signal, wherein the composite signal includes the interfering signal and the signal of interest;
means for removing selected components from the second signal to produce a filtered signal; and
a first mixer for mixing the filtered signal with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal.
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Accused Products
Abstract
This invention provides a method and circuit for separating a signal of interest from an angle modulated interfering signal in which a composite signal, including the signal of interest and the interfering signal, is used to produce first and second signals, the first signal being representative of the composite signal and the second signal being representative of the envelope of the composite signal. Selected components are removed from the second signal to produce a filtered signal. The filtered signal is mixed with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal.
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Citations
17 Claims
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1. A circuit for separating a radio frequency signal of interest from an interfering signal, said circuit comprising:
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means for receiving a composite signal and for producing first and second signals, said first signal being representative of the composite signal and said second signal being representative of the envelope of the composite signal, wherein the composite signal includes the interfering signal and the signal of interest; means for removing selected components from the second signal to produce a filtered signal; and a first mixer for mixing the filtered signal with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio frequency receiver comprising:
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means for receiving a radio frequency signal, said radio frequency signal including a signal of interest and an interfering signal; means for converting said radio frequency signal into an intermediate frequency composite signal; means for producing first and second signals, said first signal being representative of said intermediate frequency composite signal and said second signal being representative of the envelope of said intermediate frequency composite signal; means for removing selected components from the second signal to produce a filtered signal; a first mixer for mixing the filtered signal with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal; and means for extracting said signal of interest from said output signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of separating a radio frequency signal of interest from an interfering signal said method comprising the steps of:
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receiving a composite signal, wherein the composite signal includes the interfering signal and the signal of interest; producing first and second signals, said first signal being representative of the composite signal and said second signal being representative of the envelope of the composite signal; removing selected components from the second signal to produce a filtered signal; and mixing the filtered signal with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal. - View Dependent Claims (16)
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17. A method of processing radio frequency signals, said method comprising the steps of:
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receiving a radio frequency signal, said radio frequency signal including a signal of interest and an interfering signal; converting said radio frequency signal to an intermediate frequency composite signal; producing first and second signals, said first signal being representative of said intermediate frequency composite signal and said second signal being representative of the envelope of said intermediate frequency composite signal, wherein the intermediate frequency composite signal includes the interfering signal and the signal of interest; removing selected components from the second signal to produce a filtered signal; mixing the filtered signal with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal; and extracting said signal of interest from said output signal.
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Specification