Type-based baseband predistorter function estimation technique for non-linear circuits
First Claim
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1. A method of compensating for non-linear conversion distortions of a circuit comprising the steps of:
- (a) providing a reference type information for an input signal being provided to the circuit;
(b1) mapping of the input signal to form a mapped signal; and
, (b2) pulse shaping of the mapped signal, where the reference type information is based on a known pulse shaping function;
(c) sampling a portion of an output signal to provide a plurality of values relating to a parameter thereof, each at a different time;
(d) deriving predistortion information based on the reference type information and the plurality of values; and
(e) predistorting one of the pulse shaped signal and the input signal being provided to the circuit in dependence upon the predistortion information.
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Abstract
This invention is about a novel estimation technique for generating a predistortion function to compensate for the AM-AM and AM-PM non-linear conversion distortions of non-linear power amplifiers or non-linear circuits. Based on the cumulative type of power amplifier output envelope, a non-parametric baseband predistortion function is derived. The non-parametric approach avoids any model mismatch. In addition, the technique does not need to demodulate the input signal. Furthermore, it minimizes the effect of the power amplifier non-linearity and significantly improves the system performance
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Citations
38 Claims
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1. A method of compensating for non-linear conversion distortions of a circuit comprising the steps of:
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(a) providing a reference type information for an input signal being provided to the circuit;
(b1) mapping of the input signal to form a mapped signal; and
,(b2) pulse shaping of the mapped signal, where the reference type information is based on a known pulse shaping function;
(c) sampling a portion of an output signal to provide a plurality of values relating to a parameter thereof, each at a different time;
(d) deriving predistortion information based on the reference type information and the plurality of values; and
(e) predistorting one of the pulse shaped signal and the input signal being provided to the circuit in dependence upon the predistortion information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A circuit comprising:
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a memory circuit for storing a reference type information for an input signal being provided to the circuit;
a transforming circuit for transforming the input signal in a non-linear manner to form an output signal comprising;
a mapping circuit for mapping of the input signal to form a mapped signal, and a pulse shaping circuit for pulse shaping of the mapped signal, where the reference type information is based on a known pulse shaping function;
a sampling circuit for sampling a portion of the output signal to provide a plurality of values relating to a parameter thereof, each at a different time;
a processor for deriving predistortion information based on the reference type information and the plurality of values; and
a predistortion circuit for predistorting the input signal being provided to the circuit in dependence upon the predistortion information. - View Dependent Claims (38)
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Specification