IP Library › Granted Patent US 7,436,883
Granted Patent B2
US 7,436,883 · App. 11/255,587 · Granted Oct 14, 2008

Nonlinear inversion

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Quick Facts
Patent No.
US 7,436,883
App. No.
11/255,587
Granted
Oct 14, 2008
Kind
B2
Abstract

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 model, and filtering the signal using the inverse linearized channel model.

Claims (14)

1. A method for processing a signal propagated through a nonlinear channel, including:

receiving the signal;

adaptively determining an inverse linearized channel model, wherein the inverse linearized channel model has a linearized transfer function that includes a plurality of linear operators and nonlinear operators, wherein the nonlinear operators include minimum and maximum operators; and

filtering the signal using the inverse linearized channel model.

2. A method for processing a signal propagated through a nonlinear channel as recited in claim 1 , wherein adaptively determining an inverse linearized channel model includes using a least mean squared algorithm.

3. A method for processing a signal propagated through a nonlinear channel as recited in claim 1 , wherein adaptively determining an inverse linearized channel model includes determining coefficients of the plurality of linear operators.

4. A method for processing a signal propagated through a nonlinear channel as recited in claim 1 , wherein the plurality of linear operators are each first order polynomials.

5. A method for processing a signal propagated through a nonlinear channel as recited in claim 1 , wherein adaptively determining an inverse linearized channel model includes determining coefficients of the plurality of nonlinear operators.

6. A receiver for processing a signal from a transmitter, wherein the signal propagated through a nonlinear channel, comprising:

a nonlinear filter implementing an inverse linearized channel model that is used to filter a received input signal, wherein the inverse linearized channel model is adaptively determined, and wherein the inverse linearized channel model has a linearized transfer function that includes a plurality of linear operators and nonlinear operators, wherein the nonlinear operators include minimum and maximum operators.

7. A receiver for processing a signal propagated through a nonlinear channel as recited in claim 6 , wherein adaptively determining an inverse linearized channel model includes using a least mean squared algorithm.

8. A receiver for processing a signal propagated through a nonlinear channel as recited in claim 6 , wherein adaptively determining an inverse linearized channel model includes determining coefficients of the plurality of linear operators.

9. A receiver for processing a signal propagated through a nonlinear channel as recited in claim 6 , wherein the plurality of linear operators are each first order polynomials.

10. A receiver for processing a signal propagated through a nonlinear channel as recited in claim 6 , wherein adaptively determining an inverse linearized channel model includes determining coefficients of the plurality of nonlinear operators.