Adaptive noise reduction system for a wireless receiver

Abstract

A receiver with reduced near field noise is described. The receiver has a far range receiving section configured to sense a desired signal that includes near field noise. The receiver further includes a near range receiving section configured to sense a near field noise reference signal. An adaptive noise canceller (ANC) of the receiver is configured to detect the magnitude of an error vector from the far range receiving section. The ANC is configured to adjust the phase and gain of the near field noise reference signal in response to the magnitude of the error. Accordingly, the ANC can generate a corrected near field noise reference signal that is added to the desired signal with an adder. The near field noise is canceled by the addition of the corrected near field noise signal. The ANC uses a least mean square technique to determine the amount of correction needed.

1 . A receiver with 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 configured to detect the magnitude of an error vector from the far range receiving section by correlating the sensed desired signal from the far range receiving section with a known noise interference reference signal, and to adjust the phase and gain of the near field noise reference signal in response thereto in order to generate a corrected near field noise reference signal; and    an adder configured to add the corrected near field noise reference signal to the desired signal in order to cancel the near field noise.    
   
   
       2 . The receiver of  claim 1  wherein the far range receiving section comprises: 
 a far range antenna configured to sense the desired signal and the near field noise;    a far range bandpass filter electrically connected to the far range antenna; and    and a far range amplifier electrically connected to the far range bandpass filter;    wherein the far range antenna, the far range bandpass filter, and the far range ampliflier are configured to sense the desired signal and the near filed noise.    
   
   
       3 - 29 . (canceled)