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| Number | Title | Issue Date |
| 7917337 | Adaptive self-linearization with separation filter Signal processing includes receiving an unknown signal having a distorted component and an undistorted component, the distorted component and the undistorted component having a nonlinear relationship; and separating from the unknown signal a reference component and ... | 03/29/2011 |
| 7869550 | Nonlinear digital signal processor A digital signal processor (DSP) comprises an input terminal configured to receive an input, an adaptive nonlinear phase filter coupled to the input terminal, the adaptive nonlinear phase filter having a time-varying phase response, and an adaptive nonlinear amplitu... | 01/11/2011 |
| 7689297 | Nonlinear system observation and control An observation system configured to observe one or more initially unknown state variables of an observed system includes an input interface configured to receive a system input, and a processing module coupled to the input interface. The processing module is configu... | 03/30/2010 |
| 7688235 | Composite analog to digital receiver with adaptive self-linearization A distortion correcting analog to digital converter (ADC) system includes a plurality of ADCs configured to convert an analog signal to a plurality of digital ADC outputs, wherein the plurality of ADCs are configured to generate a composite signal based on the plura... | 03/30/2010 |
| 7688139 | Model based distortion reduction for power amplifiers A method of processing a signal is disclosed. The method comprises generating a digital signal, converting the digital signal to an analog signal, and generating an amplified analog signal having distortions. The method further comprises converting the amplified ana... | 03/30/2010 |
| 7613759 | Low-complexity nonlinear filters Processing an input signal that includes an input variable is disclosed. The input variable is compared to a set of ordered constants, the relative location of the input variable within a range of possible inputs is determined and a filter coefficient of a nonlinear... | 11/03/2009 |
| 7602321 | Adaptive composite analog to digital converter A distortion correcting analog to digital converter (ADC) system includes a plurality of ADCs configured to convert an analog signal to a plurality of digital ADC outputs, wherein the plurality of ADCs are configured to generate a composite signal based on the plura... | 10/13/2009 |
| 7460916 | Nonlinear system observation and control An observation system configured to observe at least one known state variable of an observed system includes a plurality of filters that are configured to receive a system input, and generate the at least one unknown state variable. Generating the unknown state vari... | 12/02/2008 |
| 7446682 | Analog to digital converter with distortion correction A system and method are disclosed for correcting for output distortion of an analog to digital converter, comprising: estimating the output distortion, providing an estimated distortion, and combining an output of the analog to digital converter with the estimated d... | 11/04/2008 |
| 7436883 | Nonlinear inversion A system and method are disclosed for processing a signal propagated through a nonlinear channel. The method includes modeling the channel characteristics to produce a linearized channel model, deriving an inverse linearized channel model from the linearized channel... | 10/14/2008 |
| 7429892 | Model based distortion reduction for power amplifiers A method of processing a signal is disclosed. The method comprises generating a digital signal, converting the digital signal to an analog signal, and generating an amplified analog signal having distortions. The method further comprises converting the amplified ana... | 09/30/2008 |
| 7397404 | Digital linearizing system A signal processing system includes a receiving terminal configured to receive a digital signal comprising a plurality of samples associated with a plurality of original sampling times, wherein the original sampling times have a period of T, and a compensation modul... | 07/08/2008 |
| 7394413 | Reduced complexity nonlinear filters for analog-to-digital converter linearization A method of converting an input analog signal to a compensated digital signal comprises converting the input analog signal to an uncompensated digital signal, inputting the uncompensated digital signal to a distortion model, generating a modeled distortion signal ba... | 07/01/2008 |
| 7369658 | Secure modulation and demodulation A system and method are disclosed for securely transmitting and receiving a signal. A nonlinear keying modulator is used in the transmitter to encrypt the signal using a nonlinear keying modulation technique. A nonlinear keying demodulator is used in the receiver to... | 05/06/2008 |
| 7358798 | Nonlinear filter A system and a method are disclosed for converting analog signal to digital. An analog to digital converter system comprises an analog to digital converter (ADC) and an adaptive filter coupled to the ADC, wherein the adaptive filter is coupled to the ADC in a feedfo... | 04/15/2008 |
| 7199736 | Digital linearizing system A method of compensating for nonlinear distortions in a digital signal comprises receiving the digital signal, generating a nominal phase shifted signal based on the digital signal, generating a modeled distortion signal based on the digital signal and the nominal p... | 04/03/2007 |
| 7154328 | Nonlinear filter A system and method are disclosed for a nonlinear filter having a nonlinear transfer function. The nonlinear filter comprises a plurality of linear filters each having a filter output, a plurality of nonlinear elements each connected to one of the plurality of linea... | 12/26/2006 |
| 7142137 | Reduced complexity nonlinear filters for analog-to-digital converter linearization A method of converting an input analog signal to a compensated digital signal comprises converting the input analog signal to an uncompensated digital signal, inputting the uncompensated digital signal to a distortion model, generating a modeled distortion signal ba... | 11/28/2006 |
| 7002495 | Analog to digital converter with distortion correction A method of correcting for output distortion of an analog to digital converter (ADC) is disclosed. The method comprises estimating the output distortion and providing an estimated distortion. The method further comprises combining an output of the ADC with the estim... | 02/21/2006 |
| 6999510 | Nonlinear inversion A method for processing a signal propagated through a nonlinear channel is disclosed. The method comprises modeling the channel characteristics to produce a linearized channel model, wherein the linearized channel model has a linearized transfer function that includ... | 02/14/2006 |
| 6885323 | Analog to digital converter with distortion correction A system and method are disclosed for correcting for output distortion of an analog to digital converter, comprising: estimating the output distortion, providing an estimated distortion, and combining an output of the analog to digital converter with the estimated d... | 04/26/2005 |
