Apparatus and method for improving an output signal from a nonlinear device through dynamic signal pre-distortion based upon lagrange interpolation
First Claim
1. An apparatus for pre-distorting a signal, comprising:
- input nodes to receive an in-phase input signal and a quadrature input signal;
feedback nodes to receive an in-phase feedback signal and a quadrature feedback signal;
output nodes to transmit an in-phase pre-distorted signal and a quadrature pre-distorted signal; and
a Lagrange interpolation digital pre-distortion circuit connected to said input nodes, said feedback nodes, and said output nodes, said Lagrange interpolation digital pre-distortion circuit being configured to perform a Lagrange interpolation on said in-phase input signal, said quadrature input signal, said in-phase feedback signal, and said quadrature feedback signal to produce said in-phase pre-distorted signal and said quadrature pre-distorted signal.
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Abstract
An apparatus for pre-distorting a signal includes input nodes to receive an in-phase input signal and a quadrature input signal. Feedback nodes receive an in-phase feedback signal and a quadrature feedback signal. Output nodes transmit an in-phase pre-distorted signal and a quadrature pre-distorted signal. A Lagrange interpolation digital pre-distortion circuit is connected to the input nodes, the feedback nodes, and the output nodes. The Lagrange interpolation digital pre-distortion circuit is configured to perform a Lagrange interpolation on the in-phase input signal, the quadrature input signal, the in-phase feedback signal, and the quadrature feedback signal to produce the in-phase pre-distorted signal and the quadrature pre-distorted signal.
8 Citations
16 Claims
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1. An apparatus for pre-distorting a signal, comprising:
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input nodes to receive an in-phase input signal and a quadrature input signal;
feedback nodes to receive an in-phase feedback signal and a quadrature feedback signal;
output nodes to transmit an in-phase pre-distorted signal and a quadrature pre-distorted signal; and
a Lagrange interpolation digital pre-distortion circuit connected to said input nodes, said feedback nodes, and said output nodes, said Lagrange interpolation digital pre-distortion circuit being configured to perform a Lagrange interpolation on said in-phase input signal, said quadrature input signal, said in-phase feedback signal, and said quadrature feedback signal to produce said in-phase pre-distorted signal and said quadrature pre-distorted signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of pre-distorting a signal, comprising:
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receiving an in-phase input signal, a quadrature input signal, an in-phase feedback signal, and a quadrature feedback signal; and
performing a Lagrange interpolation on said in-phase input signal, said quadrature input signal, said in-phase feedback signal, and said quadrature feedback signal to produce an in-phase pre-distorted signal and a quadrature pre-distorted signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification