Adaptive noise reduction system for a wireless receiver

A receiver having reduced near field noise, the receiver comprising:

• a far range receiving section configured to sense a desired signal having near field noise;
• a near range receiving section configured to sense a near field noise reference signal;
• an adaptive noise canceller electrically connected to the far range receiving section and configured to detect the magnitude of an error vector from the far range receiving section and generate a phase compensation coefficient signal and a gain compensation coefficient signal therefrom;
• a tap delay line electrically connected to the adaptive noise canceller and the near range receiving section, the tap delay line configured to adjust the phase and gain of the near field noise reference signal in response to the phase compensation coefficient signal and the gain compensation coefficient signal in order to generate a corrected near field noise reference signal;
• and
• an adder electrically connected to the tap delay line and the far range receiver, the adder configured to add the corrected near field noise reference signal to the desired signal in order to cancel the near field noise.

A noise canceling receiver comprising:

• far range receiving means configured to sense a desired signal having near field noise;
• near range receiving means configured to sense a near field noise reference signal;
• noise canceling means configured to detect the magnitude of an error vector from the far range receiving means and adjust the phase and magnitude of the near field noise reference signal in response thereto such that the noise canceling means generates a corrected near field noise reference signal;
• and
• addition means electrically connected to the noise canceling means and the far range receiving means, the addition means configured to add the corrected near field noise reference signal to the desired signal and in order to cancel the near field noise.

A method for reducing near field noise in a desired signal, the method comprising the steps of:

• (a) sensing the desired signal having near field noise with a far range receiving section;
• (b) sensing a near field noise reference signal with a near range receiving section;
• (c) generating a compensation signal with an adaptive noise canceller that detects the magnitude of an error vector from the far range receiving section;
• (d) adjusting the phase and gain of the near field noise reference signal with the compensation signal in order to generate a corrected near field noise reference signal;
• and
• (e) adding the corrected near field noise reference signal to the desired signal in order to cancel the near field noise.

A system for reducing near field noise in a desired signal, the system comprising:

• means for sensing the desired signal having near field noise;
• means for sensing a near field noise reference signal;
• means for generating a noise canceling signal by detecting the magnitude of an error vector from the means for sensing the desired signal in order to generate a compensation signal;
• means for adjusting the phase and gain of the near field noise reference signal in response to the compensation signal in order to generate a corrected near field noise reference signal;
• and
• means for adding the near field noise reference signal to the desired signal in order to cancel the near field noise.

A system for generating a desired signal with reduced near field noise, the system comprising:

• a far range antenna configured to sense the desired signal having near field noise;
• a far range bandpass filter electrically connected to the far range antenna and configured to pass the frequency of the desired signal;
• a far range amplifier electrically connected to the bandpass filter and configured to amplify the desired signal;
• an in-phase path electrically connected to the far range amplifier and configured to mix the desired signal with a local oscillator signal and to convert the desired signal into a digital representation;
• a quadrature phase path electrically connected to the far range amplifier and configured to mix the desired signal with the local oscillator signal and to convert the desired signal into a digital representation;
• an adaptive noise canceller electrically connected to the in-phase path and the quadrature phase path, the adaptive noise canceller configured to detect the magnitude of an error vector from the in-phase path and the quadrature phase path and generate a compensation signal therefrom;
• a near range interferer antenna configured to sense a near field noise reference signal;
• a near range bandpass filter electrically connected to the far range interferer antenna and configured to pass the frequency of the near field noise reference signal;
• a near range amplifier electrically connected to the near range bandpass filter and configured to amplify the near field noise reference signal;
• a gain corrector electrically connected to the far range amplifier and the adaptive noise canceller, the gain corrector configured to adjust the gain of the near field noise reference signal in response to the noise compensation signal;
• a phase corrector electrically connected to the gain corrector and the adaptive noise canceller, the phase corrector configured to adjust the phase of the near field noise reference signal in response to the compensation signal and generate a corrected near field noise reference signal;
• and
• an adder electrically connected to the phase corrector, the in-phase path, and the quadrature phase path, the adder configured to add the corrected near field noise signal to the desired signal in order to reduce the magnitude of the near field noise.