A QRD-RLS-Based Predistortion Scheme for High-Power Amplifier Linearization

Author

Muruganathan, Siva D. ; Sesay, Abu B.

Author_Institution

TRLabs, Calgary, Alta.

Volume

53

Issue

10

fYear

2006

Firstpage

1108

Lastpage

1112

Abstract

A digital baseband predistortion (PD) scheme for high-power amplifier (HPA) linearization is proposed and analyzed in this brief. The proposed approach utilizes the QR-decomposition-based recursive least squares (QRD-RLS) algorithm to estimate the memoryless complex polynomial coefficients that characterize the HPA. The inverse polynomial model coefficients corresponding to the PD are similarly extracted using QRD-RLS. The performance of the proposed PD scheme is analyzed via simulations and compared with previously published techniques. Results show that the QRD-RLS-based solution offers improved performance over its comparatives

Keywords

computational complexity; least squares approximations; linearisation techniques; power amplifiers; recursive estimation; QR decomposition-based recursive least squares algorithm; QRD-RLS-based predistortion scheme; digital baseband predistortion scheme; high-power amplifier linearization; inverse polynomial model coefficients; Baseband; High power amplifiers; Inverse problems; Least squares approximation; Numerical stability; Polynomials; Power amplifiers; Predistortion; Recursive estimation; Table lookup; Adaptive signal processing; nonlinear systems; numerical stability; power amplifiers;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.882182

Filename

1715587