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Research

1

Armando Cova:
Predistortion in a linear transmitter using orthogonal kernels.
Glenayre Electronics,
Christensen O Connor Johnson Kindness PLLC,
October 31, 2000:
US06141390
(175 worldwide citation)

A system for linearly transmitting an amplified output signal using predistortion is disclosed. The system uses a straight inverse modeling scheme with orthogonal predictor variables to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF transmitter ...

2

Robert Richard Leyendecker, Jay Jui Chieh Chen, Armando Cova Garrido, Yan Guo, Vladimir Pavlovic, Claudio Gustavo Rey, Desmond Wai Ming Yan:
Method and apparatus for linear transmission by direct inverse modeling.
Glenayre Electronics,
Christensen O Connor Johnson & Kindness PLLC,
July 13, 1999:
US05923712
(61 worldwide citation)

A system for linearly transmitting an amplified output signal using predistortion whereby a straight inverse modeling scheme is used to more easily and accurately determine the inverse of the distortion caused by a power amplifier of a RF transmitter. The "inverse" of the power amplifier is directly ...

3

Armando Cova Garrido:
Model-based adaptive feedforward amplifier linearizer.
Glenayre Electronics,
Christensen O Connor Johnson & Kindness PLLC,
September 28, 1999:
US05959500
(50 worldwide citation)

A linear RF transmitter uses an adaptive forward model of the power amplifier in a feedforward linearization system. The forward model outputs a modeled power amplifier output signal, which is then used to calculate the error signal. The error signal represents the distortion caused by the power amp ...

4

Armando Cova, Scott Carichner:
Wideband enhanced digital injection predistortion system and method.
Powerwave Technologies,
Myers Dawes Andras & Sherman,
April 29, 2008:
US07366252
(14 worldwide citation)

A system for linearizing RF amplifiers employing baseband predistortion techniques provides additive or multiplicative predistortion of the quadrature (I/Q) input signal. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer characteristic of the amplifier, providing ...

5

Armando Cova:
Digital predistortion system and method for high efficiency transmitters.
Powerwave Technologies,
Myers Dawes Andras & Sherman,
February 26, 2008:
US07336725
(7 worldwide citation)

A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order to minimize distortion at the outpu ...

6

Armando Cova:
Signal peak-to-average power ratio (PAR) reduction.
Intel IP Corporation,
Baker Botts L,
October 6, 2015:
US09154168

A method of reducing a peak to average power ratio (PAR) of a signal may include generating an in-band error signal indicating in-band distortion of a compressed signal and generating an out-of-band error signal indicating out-of-band distortion of the compressed signal. The method may further inclu ...

7

Armando Cova:
Device and method of pre-distortion of power amplifier input signals.
Intel IP Corporation,
Schwegman Lundberg & Woessner P A,
October 10, 2017:
US09787336

Embodiments of a mobile communication device and method for digital pre-distortion (DPD) are disclosed herein. The mobile communication device may scale a sequence of input samples by per-sample scale factors to generate a sequence of output samples for input to a power amplifier (PA), the input sam ...

8

Armando Cova:
Digital predistortion system and method for high efficiency transmitters.
Myers Dawes Andras & Sherman,
September 8, 2005:
US20050195919-A1

A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order to minimize distortion at the outpu ...

9

Armando Cova, Scott Carichner:
Wideband enhanced digital injection predistortion system and method.
Myers Dawes Andras & Sherman,
July 21, 2005:
US20050157814-A1

A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order to minimize distortion at the outpu ...