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US 11,329,689 B1Granted
Adaptive signal suppression using a feedforward waveform
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorChristopher T. Rodenbeck
Life of this patent
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Abstract
Systems and method are provided for canceling unwanted transmitter-to-receiver leakage in a coherent wireless system using a feedforward waveform that overcomes the limitations of purely analog or purely digital cancelation systems and methods. Systems and methods in accordance with embodiments of the present disclosure generate a software-defined waveform that, when fed forward into the receiver, effectively cancels the leakage. Embodiments of the present disclosure can use a defined cancelation waveform (e.g., a software-defined cancelation waveform) that can cancel multiple leakage paths at the same time.
Claims20
A transceiver, comprising:
- a transmitter, comprising a digital signal generator, configured to transmit a signal to a target, wherein the digital signal generator is configured to:
- detect a plurality of undesired signals,
- generate a first mitigation signal configured to suppress a first undesired signal in the plurality of undesired signals,
- generate a second mitigation signal configured to suppress a second undesired signal in the plurality of undesired signals, and
- generate an output signal that is a combination of the first mitigation signal and the second mitigation signal;
- a receiver, coupled to the transmitter, wherein the receiver is configured to receive a reflected signal reflected from the target;
- and
- a cancelation signal generator coupled to the digital signal generator and the receiver, wherein the cancelation signal generator comprises:
- a digital to analog converter (DAC), coupled to the digital signal generator, wherein the DAC is configured to receive the output signal,
- a filter coupled to the DAC, and
- an amplifier coupled to the filter, wherein the amplifier is configured to output a cancelation signal, and wherein the receiver is configured to:
- receive the cancelation signal, and
- cancel leakage in the receiver using the cancelation signal.
10 more elements
A transceiver, comprising:
- a transmitter, comprising a digital signal generator, configured to transmit a signal to a target, wherein the digital signal generator is configured to:
- generate a first mitigation signal configured to suppress a first undesired signal in the plurality of undesired signals in response to a determination that the first undesired signal was received by the transceiver,
- generate a second mitigation signal configured to suppress a second undesired signal in the plurality of undesired signals in response to a determination that the second undesired signal was received by the transceiver, and
- generate an output signal that is a combination of the first mitigation signal and the second mitigation signal;
- a receiver, coupled to the transmitter, wherein the receiver is configured to receive a reflected signal reflected from the target;
- and
- a cancelation signal generator coupled to the digital signal generator and the receiver, wherein the cancelation signal generator comprises:
- a digital to analog converter (DAC) coupled to the digital signal generator, wherein the DAC is configured to receive the output signal,
- a filter coupled to the DAC, and
- an amplifier coupled to the filter, wherein the amplifier is configured to output a cancelation signal derived from the mitigation signal, and wherein the receiver is configured to:
- receive the cancelation signal, and
- cancel the undesired signal using the cancelation signal.
9 more elements
A transceiver, comprising:
- a transmitter, comprising a digital signal generator, configured to transmit a signal to a target, wherein the digital signal generator is configured to:
- detect a plurality of undesired signals,
- generate a first mitigation signal configured to suppress a first undesired signal in the plurality of undesired signals,
- generate a second mitigation signal configured to suppress a second undesired signal in the plurality of undesired signals, and
- generate an output signal that is a combination of the first mitigation signal and the second mitigation signal;
- a receiver, coupled to the transmitter, wherein the receiver is configured to receive a reflected signal reflected from the target, and wherein the receiver comprises:
- a bandpass filter (BPF) configured to receive the reflected signal,
- a low noise amplifier (LNA) coupled to the BPF,
- a mixer coupled to the LNA,
- a low pass filter (LPF) coupled to the mixer,
- an intermediate frequency amplifier (IFA) coupled to the LPF,
- an analog to digital converter (ADC) coupled to the IFA, and
- a digital signal processor (DSP) coupled to the ADC, and
- a cancelation signal generator coupled to the digital signal generator and the receiver, wherein the cancelation signal generator comprises:
- a digital to analog converter (DAC) coupled to the digital signal generator, wherein the FAC is configured to receive the output signal,
- a filter coupled to the DAC, and
- an amplifier coupled to the filter, wherein the amplifier is configured to output a cancelation signal, and wherein the receiver is configured to:
- receive the cancelation signal, and
- cancel leakage in the receiver using the cancelation signal.
16 more elements
Dependencies are inferred from the claim text.